BQS OBSP Determination:
DIBROMOMETHANE
METHOD: 4054 , TESTIDCODE: 30217GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 102%  Expected Conc. = 0.5 
 Median Pct Recovery = 102%  Expected Conc. = 0.5 
 Median Pct Recovery = 102%  Expected Conc. = 0.28 
 Median Pct Recovery = 102%  Expected Conc. = 0.28 
 Median Pct Recovery = 102%  Expected Conc. = 0.28 
 Median Pct Recovery = 102%  Expected Conc. = 0.28 
 Median Pct Recovery = 102%  Expected Conc. = 0.28 
 Median Pct Recovery = 102%  Expected Conc. = 0.28 
 Median Pct Recovery = 102%  Expected Conc. = 0.017 
 Median Pct Recovery = 102%  Expected Conc. = 0.017 
 Median Pct Recovery = 102%  Expected Conc. = 0.017 
 Median Pct Recovery = 102%  Expected Conc. = 0.017 
 Median Pct Recovery = 102%  Expected Conc. = 0.017 
 Median Pct Recovery = 102%  Expected Conc. = 0.017 
 Median Pct Recovery = 102%  Expected Conc. = 0.0034 
 Median Pct Recovery = 102%  Expected Conc. = 0.0034 
 Median Pct Recovery = 102%  Expected Conc. = 0.0034 
 Median Pct Recovery = 102%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 112%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 102%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 100%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 118%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 101%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
BROMODICHLOROMETHANE
METHOD: 4054 , TESTIDCODE: 32101GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 4.998 
 Median Pct Recovery = 103%  Expected Conc. = 4.998 
 Median Pct Recovery = 103%  Expected Conc. = 4.998 
 Median Pct Recovery = 103%  Expected Conc. = 4.998 
 Median Pct Recovery = 103%  Expected Conc. = 4.998 
 Median Pct Recovery = 103%  Expected Conc. = 4.81 
 Median Pct Recovery = 103%  Expected Conc. = 4.81 
 Median Pct Recovery = 103%  Expected Conc. = 4.81 
 Median Pct Recovery = 103%  Expected Conc. = 4.81 
 Median Pct Recovery = 103%  Expected Conc. = 4.81 
 Median Pct Recovery = 103%  Expected Conc. = 4.81 
 Median Pct Recovery = 103%  Expected Conc. = 4.48 
 Median Pct Recovery = 103%  Expected Conc. = 4.48 
 Median Pct Recovery = 103%  Expected Conc. = 4.48 
 Median Pct Recovery = 103%  Expected Conc. = 4.48 
 Median Pct Recovery = 103%  Expected Conc. = 0.962 
 Median Pct Recovery = 103%  Expected Conc. = 0.962 
 Median Pct Recovery = 103%  Expected Conc. = 0.962 
 Median Pct Recovery = 103%  Expected Conc. = 0.962 
 Median Pct Recovery = 103%  Expected Conc. = 0.896 
 Median Pct Recovery = 103%  Expected Conc. = 0.896 
 Median Pct Recovery = 103%  Expected Conc. = 0.896 
 Median Pct Recovery = 103%  Expected Conc. = 0.896 
 Median Pct Recovery = 103%  Expected Conc. = 0.896 
 Median Pct Recovery = 103%  Expected Conc. = 0.896 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.348 
 Median Pct Recovery = 103%  Expected Conc. = 0.348 
 Median Pct Recovery = 103%  Expected Conc. = 0.348 
 Median Pct Recovery = 103%  Expected Conc. = 0.348 
 Median Pct Recovery = 103%  Expected Conc. = 0.348 
 Median Pct Recovery = 103%  Expected Conc. = 0.348 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 104%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 111%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 103%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 100%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 102%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 105%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 105%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 98%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 105%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 101%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 111%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 96%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 105%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 111%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 99%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 95%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 103%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 91%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 99%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 110%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TETRACHLOROMETHANE
METHOD: 4054 , TESTIDCODE: 32102GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.12 
 Median Pct Recovery = 103%  Expected Conc. = 6.12 
 Median Pct Recovery = 103%  Expected Conc. = 6.12 
 Median Pct Recovery = 103%  Expected Conc. = 6.12 
 Median Pct Recovery = 103%  Expected Conc. = 6.12 
 Median Pct Recovery = 103%  Expected Conc. = 5.808 
 Median Pct Recovery = 103%  Expected Conc. = 5.808 
 Median Pct Recovery = 103%  Expected Conc. = 5.808 
 Median Pct Recovery = 103%  Expected Conc. = 5.808 
 Median Pct Recovery = 103%  Expected Conc. = 4.68 
 Median Pct Recovery = 103%  Expected Conc. = 4.68 
 Median Pct Recovery = 103%  Expected Conc. = 4.68 
 Median Pct Recovery = 103%  Expected Conc. = 4.68 
 Median Pct Recovery = 103%  Expected Conc. = 4.68 
 Median Pct Recovery = 103%  Expected Conc. = 4.68 
 Median Pct Recovery = 103%  Expected Conc. = 1.1616 
 Median Pct Recovery = 103%  Expected Conc. = 1.1616 
 Median Pct Recovery = 103%  Expected Conc. = 1.1616 
 Median Pct Recovery = 103%  Expected Conc. = 1.1616 
 Median Pct Recovery = 103%  Expected Conc. = 1.1616 
 Median Pct Recovery = 103%  Expected Conc. = 1.1616 
 Median Pct Recovery = 103%  Expected Conc. = 0.936 
 Median Pct Recovery = 103%  Expected Conc. = 0.936 
 Median Pct Recovery = 103%  Expected Conc. = 0.936 
 Median Pct Recovery = 103%  Expected Conc. = 0.936 
 Median Pct Recovery = 103%  Expected Conc. = 0.9 
 Median Pct Recovery = 103%  Expected Conc. = 0.9 
 Median Pct Recovery = 103%  Expected Conc. = 0.9 
 Median Pct Recovery = 103%  Expected Conc. = 0.9 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.246 
 Median Pct Recovery = 103%  Expected Conc. = 0.246 
 Median Pct Recovery = 103%  Expected Conc. = 0.246 
 Median Pct Recovery = 103%  Expected Conc. = 0.246 
 Median Pct Recovery = 103%  Expected Conc. = 0.246 
 Median Pct Recovery = 103%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 102%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 107%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 101%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 110%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 103%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 99%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 93%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 106%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 104%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 90%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 111%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 101%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 90%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 107%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 89%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 102%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 110%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 106%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 105%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 102%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2-DICHLOROETHANE
METHOD: 4054 , TESTIDCODE: 32103GCM66
DATES: 01/11/00 - 10/04/03

 Expected Conc. = 6.06 
 Median Pct Recovery = 104%  Expected Conc. = 6.06 
 Median Pct Recovery = 104%  Expected Conc. = 6.06 
 Median Pct Recovery = 104%  Expected Conc. = 6.06 
 Median Pct Recovery = 104%  Expected Conc. = 6.06 
 Median Pct Recovery = 104%  Expected Conc. = 5.6 
 Median Pct Recovery = 104%  Expected Conc. = 5.6 
 Median Pct Recovery = 104%  Expected Conc. = 5.6 
 Median Pct Recovery = 104%  Expected Conc. = 5.6 
 Median Pct Recovery = 104%  Expected Conc. = 5.6 
 Median Pct Recovery = 104%  Expected Conc. = 5.6 
 Median Pct Recovery = 104%  Expected Conc. = 4.28 
 Median Pct Recovery = 104%  Expected Conc. = 4.28 
 Median Pct Recovery = 104%  Expected Conc. = 4.28 
 Median Pct Recovery = 104%  Expected Conc. = 4.28 
 Median Pct Recovery = 104%  Expected Conc. = 3.196 
 Median Pct Recovery = 104%  Expected Conc. = 3.196 
 Median Pct Recovery = 104%  Expected Conc. = 3.196 
 Median Pct Recovery = 104%  Expected Conc. = 3.196 
 Median Pct Recovery = 104%  Expected Conc. = 3.196 
 Median Pct Recovery = 104%  Expected Conc. = 3.196 
 Median Pct Recovery = 104%  Expected Conc. = 1.3 
 Median Pct Recovery = 104%  Expected Conc. = 1.3 
 Median Pct Recovery = 104%  Expected Conc. = 1.3 
 Median Pct Recovery = 104%  Expected Conc. = 1.3 
 Median Pct Recovery = 104%  Expected Conc. = 1.12 
 Median Pct Recovery = 104%  Expected Conc. = 1.12 
 Median Pct Recovery = 104%  Expected Conc. = 1.12 
 Median Pct Recovery = 104%  Expected Conc. = 1.12 
 Median Pct Recovery = 104%  Expected Conc. = 0.856 
 Median Pct Recovery = 104%  Expected Conc. = 0.856 
 Median Pct Recovery = 104%  Expected Conc. = 0.856 
 Median Pct Recovery = 104%  Expected Conc. = 0.856 
 Median Pct Recovery = 104%  Expected Conc. = 0.856 
 Median Pct Recovery = 104%  Expected Conc. = 0.856 
 Median Pct Recovery = 104%  Expected Conc. = 0.36 
 Median Pct Recovery = 104%  Expected Conc. = 0.36 
 Median Pct Recovery = 104%  Expected Conc. = 0.36 
 Median Pct Recovery = 104%  Expected Conc. = 0.36 
 Median Pct Recovery = 104%  Expected Conc. = 0.36 
 Median Pct Recovery = 104%  Expected Conc. = 0.36 
 Median Pct Recovery = 104%  Expected Conc. = 0.272 
 Median Pct Recovery = 104%  Expected Conc. = 0.272 
 Median Pct Recovery = 104%  Expected Conc. = 0.272 
 Median Pct Recovery = 104%  Expected Conc. = 0.272 
 Median Pct Recovery = 104%  Expected Conc. = 0.272 
 Median Pct Recovery = 104%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 101%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 107%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 100%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 96%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 100%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 106%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 106%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 103%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 106%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 103%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 137%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 115%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 102%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 101%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 97%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 115%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 97%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 105%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 112%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 106%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 95%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 112%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 114%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
BROMOFORM
METHOD: 4054 , TESTIDCODE: 32104GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.65 
 Median Pct Recovery = 97%  Expected Conc. = 5.65 
 Median Pct Recovery = 97%  Expected Conc. = 5.65 
 Median Pct Recovery = 97%  Expected Conc. = 5.65 
 Median Pct Recovery = 97%  Expected Conc. = 5.65 
 Median Pct Recovery = 97%  Expected Conc. = 5.166 
 Median Pct Recovery = 97%  Expected Conc. = 5.166 
 Median Pct Recovery = 97%  Expected Conc. = 5.166 
 Median Pct Recovery = 97%  Expected Conc. = 5.166 
 Median Pct Recovery = 97%  Expected Conc. = 5.166 
 Median Pct Recovery = 97%  Expected Conc. = 5.166 
 Median Pct Recovery = 97%  Expected Conc. = 5.136 
 Median Pct Recovery = 97%  Expected Conc. = 5.136 
 Median Pct Recovery = 97%  Expected Conc. = 5.136 
 Median Pct Recovery = 97%  Expected Conc. = 5.136 
 Median Pct Recovery = 97%  Expected Conc. = 1.13 
 Median Pct Recovery = 97%  Expected Conc. = 1.13 
 Median Pct Recovery = 97%  Expected Conc. = 1.13 
 Median Pct Recovery = 97%  Expected Conc. = 1.13 
 Median Pct Recovery = 97%  Expected Conc. = 1.0272 
 Median Pct Recovery = 97%  Expected Conc. = 1.0272 
 Median Pct Recovery = 97%  Expected Conc. = 1.0272 
 Median Pct Recovery = 97%  Expected Conc. = 1.0272 
 Median Pct Recovery = 97%  Expected Conc. = 1.0272 
 Median Pct Recovery = 97%  Expected Conc. = 1.0272 
 Median Pct Recovery = 97%  Expected Conc. = 1 
 Median Pct Recovery = 97%  Expected Conc. = 1 
 Median Pct Recovery = 97%  Expected Conc. = 1 
 Median Pct Recovery = 97%  Expected Conc. = 1 
 Median Pct Recovery = 97%  Expected Conc. = 0.272 
 Median Pct Recovery = 97%  Expected Conc. = 0.272 
 Median Pct Recovery = 97%  Expected Conc. = 0.272 
 Median Pct Recovery = 97%  Expected Conc. = 0.272 
 Median Pct Recovery = 97%  Expected Conc. = 0.272 
 Median Pct Recovery = 97%  Expected Conc. = 0.272 
 Median Pct Recovery = 97%  Expected Conc. = 0.27 
 Median Pct Recovery = 97%  Expected Conc. = 0.27 
 Median Pct Recovery = 97%  Expected Conc. = 0.27 
 Median Pct Recovery = 97%  Expected Conc. = 0.27 
 Median Pct Recovery = 97%  Expected Conc. = 0.27 
 Median Pct Recovery = 97%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 92%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 97%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 98%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 116%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 107%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 86%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 105%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 94%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 97%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 104%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 97%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 95%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 102%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 103%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 97%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 83%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 94%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 97%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 98%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 83%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
DIBROMOCHLOROMETHANE
METHOD: 4054 , TESTIDCODE: 32105GCM66
DATES: 01/11/00 - 10/04/03

 Expected Conc. = 6 
 Median Pct Recovery = 102%  Expected Conc. = 6 
 Median Pct Recovery = 102%  Expected Conc. = 6 
 Median Pct Recovery = 102%  Expected Conc. = 6 
 Median Pct Recovery = 102%  Expected Conc. = 6 
 Median Pct Recovery = 102%  Expected Conc. = 5.95 
 Median Pct Recovery = 102%  Expected Conc. = 5.95 
 Median Pct Recovery = 102%  Expected Conc. = 5.95 
 Median Pct Recovery = 102%  Expected Conc. = 5.95 
 Median Pct Recovery = 102%  Expected Conc. = 5.95 
 Median Pct Recovery = 102%  Expected Conc. = 5.95 
 Median Pct Recovery = 102%  Expected Conc. = 4.328 
 Median Pct Recovery = 102%  Expected Conc. = 4.328 
 Median Pct Recovery = 102%  Expected Conc. = 4.328 
 Median Pct Recovery = 102%  Expected Conc. = 4.328 
 Median Pct Recovery = 102%  Expected Conc. = 3.156 
 Median Pct Recovery = 102%  Expected Conc. = 3.156 
 Median Pct Recovery = 102%  Expected Conc. = 3.156 
 Median Pct Recovery = 102%  Expected Conc. = 3.156 
 Median Pct Recovery = 102%  Expected Conc. = 3.156 
 Median Pct Recovery = 102%  Expected Conc. = 3.156 
 Median Pct Recovery = 102%  Expected Conc. = 1.8 
 Median Pct Recovery = 102%  Expected Conc. = 1.8 
 Median Pct Recovery = 102%  Expected Conc. = 1.8 
 Median Pct Recovery = 102%  Expected Conc. = 1.8 
 Median Pct Recovery = 102%  Expected Conc. = 1.19 
 Median Pct Recovery = 102%  Expected Conc. = 1.19 
 Median Pct Recovery = 102%  Expected Conc. = 1.19 
 Median Pct Recovery = 102%  Expected Conc. = 1.19 
 Median Pct Recovery = 102%  Expected Conc. = 0.8656 
 Median Pct Recovery = 102%  Expected Conc. = 0.8656 
 Median Pct Recovery = 102%  Expected Conc. = 0.8656 
 Median Pct Recovery = 102%  Expected Conc. = 0.8656 
 Median Pct Recovery = 102%  Expected Conc. = 0.8656 
 Median Pct Recovery = 102%  Expected Conc. = 0.8656 
 Median Pct Recovery = 102%  Expected Conc. = 0.3 
 Median Pct Recovery = 102%  Expected Conc. = 0.3 
 Median Pct Recovery = 102%  Expected Conc. = 0.3 
 Median Pct Recovery = 102%  Expected Conc. = 0.3 
 Median Pct Recovery = 102%  Expected Conc. = 0.3 
 Median Pct Recovery = 102%  Expected Conc. = 0.3 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 131%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 130%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 120%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 102%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 105%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 107%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 106%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 101%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 100%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 101%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 125%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 110%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 102%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 101%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 103%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 102%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 94%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 102%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 99%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 91%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 88%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 93%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 106%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 98%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
CHLOROFORM
METHOD: 4054 , TESTIDCODE: 32106GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.432 
 Median Pct Recovery = 103%  Expected Conc. = 5.432 
 Median Pct Recovery = 103%  Expected Conc. = 5.432 
 Median Pct Recovery = 103%  Expected Conc. = 5.1 
 Median Pct Recovery = 103%  Expected Conc. = 5.1 
 Median Pct Recovery = 103%  Expected Conc. = 5.1 
 Median Pct Recovery = 103%  Expected Conc. = 5.1 
 Median Pct Recovery = 103%  Expected Conc. = 5.1 
 Median Pct Recovery = 103%  Expected Conc. = 5.1 
 Median Pct Recovery = 103%  Expected Conc. = 4.22 
 Median Pct Recovery = 103%  Expected Conc. = 4.22 
 Median Pct Recovery = 103%  Expected Conc. = 4.22 
 Median Pct Recovery = 103%  Expected Conc. = 4.22 
 Median Pct Recovery = 103%  Expected Conc. = 4.22 
 Median Pct Recovery = 103%  Expected Conc. = 4.22 
 Median Pct Recovery = 103%  Expected Conc. = 1.0864 
 Median Pct Recovery = 103%  Expected Conc. = 1.0864 
 Median Pct Recovery = 103%  Expected Conc. = 1.0864 
 Median Pct Recovery = 103%  Expected Conc. = 1.0864 
 Median Pct Recovery = 103%  Expected Conc. = 1.0864 
 Median Pct Recovery = 103%  Expected Conc. = 1.0864 
 Median Pct Recovery = 103%  Expected Conc. = 0.844 
 Median Pct Recovery = 103%  Expected Conc. = 0.844 
 Median Pct Recovery = 103%  Expected Conc. = 0.844 
 Median Pct Recovery = 103%  Expected Conc. = 0.844 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.252 
 Median Pct Recovery = 103%  Expected Conc. = 0.252 
 Median Pct Recovery = 103%  Expected Conc. = 0.252 
 Median Pct Recovery = 103%  Expected Conc. = 0.252 
 Median Pct Recovery = 103%  Expected Conc. = 0.252 
 Median Pct Recovery = 103%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 104%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 103%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 99%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 104%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 102%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 101%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 100%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 108%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 111%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 94%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 102%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 106%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 99%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 115%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 100%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 110%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 106%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 102%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 98%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TOLUENE
METHOD: 4054 , TESTIDCODE: 34010GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.744 
 Median Pct Recovery = 104%  Expected Conc. = 5.744 
 Median Pct Recovery = 104%  Expected Conc. = 5.744 
 Median Pct Recovery = 104%  Expected Conc. = 5.4 
 Median Pct Recovery = 104%  Expected Conc. = 5.4 
 Median Pct Recovery = 104%  Expected Conc. = 5.4 
 Median Pct Recovery = 104%  Expected Conc. = 5.4 
 Median Pct Recovery = 104%  Expected Conc. = 5.4 
 Median Pct Recovery = 104%  Expected Conc. = 5.4 
 Median Pct Recovery = 104%  Expected Conc. = 4.75 
 Median Pct Recovery = 104%  Expected Conc. = 4.75 
 Median Pct Recovery = 104%  Expected Conc. = 4.75 
 Median Pct Recovery = 104%  Expected Conc. = 4.75 
 Median Pct Recovery = 104%  Expected Conc. = 4.75 
 Median Pct Recovery = 104%  Expected Conc. = 4.75 
 Median Pct Recovery = 104%  Expected Conc. = 1.1488 
 Median Pct Recovery = 104%  Expected Conc. = 1.1488 
 Median Pct Recovery = 104%  Expected Conc. = 1.1488 
 Median Pct Recovery = 104%  Expected Conc. = 1.1488 
 Median Pct Recovery = 104%  Expected Conc. = 1.1488 
 Median Pct Recovery = 104%  Expected Conc. = 1.1488 
 Median Pct Recovery = 104%  Expected Conc. = 0.95 
 Median Pct Recovery = 104%  Expected Conc. = 0.95 
 Median Pct Recovery = 104%  Expected Conc. = 0.95 
 Median Pct Recovery = 104%  Expected Conc. = 0.95 
 Median Pct Recovery = 104%  Expected Conc. = 0.5 
 Median Pct Recovery = 104%  Expected Conc. = 0.5 
 Median Pct Recovery = 104%  Expected Conc. = 0.5 
 Median Pct Recovery = 104%  Expected Conc. = 0.5 
 Median Pct Recovery = 104%  Expected Conc. = 0.216 
 Median Pct Recovery = 104%  Expected Conc. = 0.216 
 Median Pct Recovery = 104%  Expected Conc. = 0.216 
 Median Pct Recovery = 104%  Expected Conc. = 0.216 
 Median Pct Recovery = 104%  Expected Conc. = 0.216 
 Median Pct Recovery = 104%  Expected Conc. = 0.216 
 Median Pct Recovery = 104%  Expected Conc. = 0.186 
 Median Pct Recovery = 104%  Expected Conc. = 0.186 
 Median Pct Recovery = 104%  Expected Conc. = 0.186 
 Median Pct Recovery = 104%  Expected Conc. = 0.186 
 Median Pct Recovery = 104%  Expected Conc. = 0.186 
 Median Pct Recovery = 104%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 104%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 104%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 109%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 116%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 97%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 98%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 93%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 105%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 105%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 94%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 117%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 105%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 92%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 94%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 107%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 121%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 98%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 98%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 101%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 106%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
BENZENE
METHOD: 4054 , TESTIDCODE: 34030GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 7.112 
 Median Pct Recovery = 103%  Expected Conc. = 7.112 
 Median Pct Recovery = 103%  Expected Conc. = 7.112 
 Median Pct Recovery = 103%  Expected Conc. = 5.172 
 Median Pct Recovery = 103%  Expected Conc. = 5.172 
 Median Pct Recovery = 103%  Expected Conc. = 5.172 
 Median Pct Recovery = 103%  Expected Conc. = 5.172 
 Median Pct Recovery = 103%  Expected Conc. = 5.172 
 Median Pct Recovery = 103%  Expected Conc. = 5.172 
 Median Pct Recovery = 103%  Expected Conc. = 4.05 
 Median Pct Recovery = 103%  Expected Conc. = 4.05 
 Median Pct Recovery = 103%  Expected Conc. = 4.05 
 Median Pct Recovery = 103%  Expected Conc. = 4.05 
 Median Pct Recovery = 103%  Expected Conc. = 4.05 
 Median Pct Recovery = 103%  Expected Conc. = 4.05 
 Median Pct Recovery = 103%  Expected Conc. = 1.4224 
 Median Pct Recovery = 103%  Expected Conc. = 1.4224 
 Median Pct Recovery = 103%  Expected Conc. = 1.4224 
 Median Pct Recovery = 103%  Expected Conc. = 1.4224 
 Median Pct Recovery = 103%  Expected Conc. = 1.4224 
 Median Pct Recovery = 103%  Expected Conc. = 1.4224 
 Median Pct Recovery = 103%  Expected Conc. = 0.81 
 Median Pct Recovery = 103%  Expected Conc. = 0.81 
 Median Pct Recovery = 103%  Expected Conc. = 0.81 
 Median Pct Recovery = 103%  Expected Conc. = 0.81 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.3 
 Median Pct Recovery = 103%  Expected Conc. = 0.3 
 Median Pct Recovery = 103%  Expected Conc. = 0.3 
 Median Pct Recovery = 103%  Expected Conc. = 0.3 
 Median Pct Recovery = 103%  Expected Conc. = 0.3 
 Median Pct Recovery = 103%  Expected Conc. = 0.3 
 Median Pct Recovery = 103%  Expected Conc. = 0.216 
 Median Pct Recovery = 103%  Expected Conc. = 0.216 
 Median Pct Recovery = 103%  Expected Conc. = 0.216 
 Median Pct Recovery = 103%  Expected Conc. = 0.216 
 Median Pct Recovery = 103%  Expected Conc. = 0.216 
 Median Pct Recovery = 103%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 103%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 102%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 102%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 118%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 100%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 99%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 96%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 106%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 106%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 98%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 117%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 105%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 97%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 94%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 100%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 99%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 105%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 106%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 117%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 108%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
ACRYLONITRILE
METHOD: 4054 , TESTIDCODE: 34215GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 12 
 Median Pct Recovery = 110%  Expected Conc. = 12 
 Median Pct Recovery = 110%  Expected Conc. = 12 
 Median Pct Recovery = 110%  Expected Conc. = 6 
 Median Pct Recovery = 110%  Expected Conc. = 6 
 Median Pct Recovery = 110%  Expected Conc. = 6 
 Median Pct Recovery = 110%  Expected Conc. = 6 
 Median Pct Recovery = 110%  Expected Conc. = 6 
 Median Pct Recovery = 110%  Expected Conc. = 6 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.196 
 Median Pct Recovery = 110%  Expected Conc. = 3.196 
 Median Pct Recovery = 110%  Expected Conc. = 3.196 
 Median Pct Recovery = 110%  Expected Conc. = 3.196 
 Median Pct Recovery = 110%  Expected Conc. = 3.196 
 Median Pct Recovery = 110%  Expected Conc. = 3.196 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 3.2 
 Median Pct Recovery = 110%  Expected Conc. = 1.28 
 Median Pct Recovery = 110%  Expected Conc. = 1.28 
 Median Pct Recovery = 110%  Expected Conc. = 1.28 
 Median Pct Recovery = 110%  Expected Conc. = 1.28 
 Median Pct Recovery = 110%  Expected Conc. = 1.28 
 Median Pct Recovery = 110%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 111%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 112%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 114%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 104%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 128%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 107%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 113%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 112%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 110%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 97%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 94%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 100%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 106%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
CHLOROBENZENE
METHOD: 4054 , TESTIDCODE: 34301GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.384 
 Median Pct Recovery = 101%  Expected Conc. = 6.384 
 Median Pct Recovery = 101%  Expected Conc. = 6.384 
 Median Pct Recovery = 101%  Expected Conc. = 6.06 
 Median Pct Recovery = 101%  Expected Conc. = 6.06 
 Median Pct Recovery = 101%  Expected Conc. = 6.06 
 Median Pct Recovery = 101%  Expected Conc. = 6.06 
 Median Pct Recovery = 101%  Expected Conc. = 6.06 
 Median Pct Recovery = 101%  Expected Conc. = 6.06 
 Median Pct Recovery = 101%  Expected Conc. = 5.5 
 Median Pct Recovery = 101%  Expected Conc. = 5.5 
 Median Pct Recovery = 101%  Expected Conc. = 5.5 
 Median Pct Recovery = 101%  Expected Conc. = 5.5 
 Median Pct Recovery = 101%  Expected Conc. = 5.5 
 Median Pct Recovery = 101%  Expected Conc. = 5.5 
 Median Pct Recovery = 101%  Expected Conc. = 1.2768 
 Median Pct Recovery = 101%  Expected Conc. = 1.2768 
 Median Pct Recovery = 101%  Expected Conc. = 1.2768 
 Median Pct Recovery = 101%  Expected Conc. = 1.2768 
 Median Pct Recovery = 101%  Expected Conc. = 1.2768 
 Median Pct Recovery = 101%  Expected Conc. = 1.2768 
 Median Pct Recovery = 101%  Expected Conc. = 1.1 
 Median Pct Recovery = 101%  Expected Conc. = 1.1 
 Median Pct Recovery = 101%  Expected Conc. = 1.1 
 Median Pct Recovery = 101%  Expected Conc. = 1.1 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.33 
 Median Pct Recovery = 101%  Expected Conc. = 0.33 
 Median Pct Recovery = 101%  Expected Conc. = 0.33 
 Median Pct Recovery = 101%  Expected Conc. = 0.33 
 Median Pct Recovery = 101%  Expected Conc. = 0.33 
 Median Pct Recovery = 101%  Expected Conc. = 0.33 
 Median Pct Recovery = 101%  Expected Conc. = 0.216 
 Median Pct Recovery = 101%  Expected Conc. = 0.216 
 Median Pct Recovery = 101%  Expected Conc. = 0.216 
 Median Pct Recovery = 101%  Expected Conc. = 0.216 
 Median Pct Recovery = 101%  Expected Conc. = 0.216 
 Median Pct Recovery = 101%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 106%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 99%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 112%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 112%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 98%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 94%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 94%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 102%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 101%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 93%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 116%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 105%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 96%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 109%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 100%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 91%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 101%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 105%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 119%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 106%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
CHLOROETHANE
METHOD: 4054 , TESTIDCODE: 34311GCM66
DATES: 02/23/00 - 07/09/03

 Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 4 
 Median Pct Recovery = 116%  Expected Conc. = 1.6 
 Median Pct Recovery = 116%  Expected Conc. = 1.6 
 Median Pct Recovery = 116%  Expected Conc. = 1.6 
 Median Pct Recovery = 116%  Expected Conc. = 1.6 
 Median Pct Recovery = 116%  Expected Conc. = 1.6 
 Median Pct Recovery = 116%  Expected Conc. = 1.6 
 Median Pct Recovery = 116%  Expected Conc. = 1.2 
 Median Pct Recovery = 116%  Expected Conc. = 1.2 
 Median Pct Recovery = 116%  Expected Conc. = 1.2 
 Median Pct Recovery = 116%  Expected Conc. = 1.2 
 Median Pct Recovery = 116%  Expected Conc. = 0.284 
 Median Pct Recovery = 116%  Expected Conc. = 0.284 
 Median Pct Recovery = 116%  Expected Conc. = 0.284 
 Median Pct Recovery = 116%  Expected Conc. = 0.284 
 Median Pct Recovery = 116%  Expected Conc. = 0.284 
 Median Pct Recovery = 116%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 128%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 136%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 137%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 138%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 129%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 101%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 115%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 122%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 117%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 103%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 95%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 93%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 90%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 108%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Median Pct Recovery = 116%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
ETHYLBENZENE
METHOD: 4054 , TESTIDCODE: 34371GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6 
 Median Pct Recovery = 106%  Expected Conc. = 6 
 Median Pct Recovery = 106%  Expected Conc. = 6 
 Median Pct Recovery = 106%  Expected Conc. = 6 
 Median Pct Recovery = 106%  Expected Conc. = 6 
 Median Pct Recovery = 106%  Expected Conc. = 5.576 
 Median Pct Recovery = 106%  Expected Conc. = 5.576 
 Median Pct Recovery = 106%  Expected Conc. = 5.576 
 Median Pct Recovery = 106%  Expected Conc. = 5.576 
 Median Pct Recovery = 106%  Expected Conc. = 4.33 
 Median Pct Recovery = 106%  Expected Conc. = 4.33 
 Median Pct Recovery = 106%  Expected Conc. = 4.33 
 Median Pct Recovery = 106%  Expected Conc. = 4.33 
 Median Pct Recovery = 106%  Expected Conc. = 4.33 
 Median Pct Recovery = 106%  Expected Conc. = 4.33 
 Median Pct Recovery = 106%  Expected Conc. = 1.1152 
 Median Pct Recovery = 106%  Expected Conc. = 1.1152 
 Median Pct Recovery = 106%  Expected Conc. = 1.1152 
 Median Pct Recovery = 106%  Expected Conc. = 1.1152 
 Median Pct Recovery = 106%  Expected Conc. = 1.1152 
 Median Pct Recovery = 106%  Expected Conc. = 1.1152 
 Median Pct Recovery = 106%  Expected Conc. = 0.866 
 Median Pct Recovery = 106%  Expected Conc. = 0.866 
 Median Pct Recovery = 106%  Expected Conc. = 0.866 
 Median Pct Recovery = 106%  Expected Conc. = 0.866 
 Median Pct Recovery = 106%  Expected Conc. = 0.5 
 Median Pct Recovery = 106%  Expected Conc. = 0.5 
 Median Pct Recovery = 106%  Expected Conc. = 0.5 
 Median Pct Recovery = 106%  Expected Conc. = 0.5 
 Median Pct Recovery = 106%  Expected Conc. = 0.216 
 Median Pct Recovery = 106%  Expected Conc. = 0.216 
 Median Pct Recovery = 106%  Expected Conc. = 0.216 
 Median Pct Recovery = 106%  Expected Conc. = 0.216 
 Median Pct Recovery = 106%  Expected Conc. = 0.216 
 Median Pct Recovery = 106%  Expected Conc. = 0.216 
 Median Pct Recovery = 106%  Expected Conc. = 0.192 
 Median Pct Recovery = 106%  Expected Conc. = 0.192 
 Median Pct Recovery = 106%  Expected Conc. = 0.192 
 Median Pct Recovery = 106%  Expected Conc. = 0.192 
 Median Pct Recovery = 106%  Expected Conc. = 0.192 
 Median Pct Recovery = 106%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 100%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 124%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 99%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 111%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 97%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 92%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 88%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 99%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 109%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 97%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 128%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 101%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 97%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 110%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 92%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 109%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 107%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 106%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 112%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
HEXACHLOROETHANE
METHOD: 4054 , TESTIDCODE: 34396GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 4.56 
 Median Pct Recovery = 103%  Expected Conc. = 4.56 
 Median Pct Recovery = 103%  Expected Conc. = 4.56 
 Median Pct Recovery = 103%  Expected Conc. = 4.56 
 Median Pct Recovery = 103%  Expected Conc. = 4.56 
 Median Pct Recovery = 103%  Expected Conc. = 3.2 
 Median Pct Recovery = 103%  Expected Conc. = 3.2 
 Median Pct Recovery = 103%  Expected Conc. = 3.2 
 Median Pct Recovery = 103%  Expected Conc. = 3.2 
 Median Pct Recovery = 103%  Expected Conc. = 3.2 
 Median Pct Recovery = 103%  Expected Conc. = 3.2 
 Median Pct Recovery = 103%  Expected Conc. = 1.9 
 Median Pct Recovery = 103%  Expected Conc. = 1.9 
 Median Pct Recovery = 103%  Expected Conc. = 1.9 
 Median Pct Recovery = 103%  Expected Conc. = 1.9 
 Median Pct Recovery = 103%  Expected Conc. = 0.0158 
 Median Pct Recovery = 103%  Expected Conc. = 0.0158 
 Median Pct Recovery = 103%  Expected Conc. = 0.0158 
 Median Pct Recovery = 103%  Expected Conc. = 0.0158 
 Median Pct Recovery = 103%  Expected Conc. = 0.0158 
 Median Pct Recovery = 103%  Expected Conc. = 0.0158 
 Median Pct Recovery = 103%  Expected Conc. = 0.0032 
 Median Pct Recovery = 103%  Expected Conc. = 0.0032 
 Median Pct Recovery = 103%  Expected Conc. = 0.0032 
 Median Pct Recovery = 103%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 97%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 112%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 107%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 82%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 85%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 110%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 113%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 99%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
BROMOMETHANE
METHOD: 4054 , TESTIDCODE: 34413GCM66
DATES: 02/23/00 - 07/09/03

 Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 3.4 
 Median Pct Recovery = 73%  Expected Conc. = 1.5 
 Median Pct Recovery = 73%  Expected Conc. = 1.5 
 Median Pct Recovery = 73%  Expected Conc. = 1.5 
 Median Pct Recovery = 73%  Expected Conc. = 1.5 
 Median Pct Recovery = 73%  Expected Conc. = 1.36 
 Median Pct Recovery = 73%  Expected Conc. = 1.36 
 Median Pct Recovery = 73%  Expected Conc. = 1.36 
 Median Pct Recovery = 73%  Expected Conc. = 1.36 
 Median Pct Recovery = 73%  Expected Conc. = 0.248 
 Median Pct Recovery = 73%  Expected Conc. = 0.248 
 Median Pct Recovery = 73%  Expected Conc. = 0.248 
 Median Pct Recovery = 73%  Expected Conc. = 0.248 
 Median Pct Recovery = 73%  Expected Conc. = 0.248 
 Median Pct Recovery = 73%  Expected Conc. = 0.248 
 Median Pct Recovery = 73%  Expected Conc. = 1.36 
 Median Pct Recovery = 73%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 66%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 84%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 52%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 55%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 73%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 74%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 107%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 123%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 74%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 66%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 72%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 73%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 68%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Median Pct Recovery = 73%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
CHLOROMETHANE
METHOD: 4054 , TESTIDCODE: 34418GCM66
DATES: 02/23/00 - 07/09/03

 Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 4.24 
 Median Pct Recovery = 119%  Expected Conc. = 3 
 Median Pct Recovery = 119%  Expected Conc. = 3 
 Median Pct Recovery = 119%  Expected Conc. = 3 
 Median Pct Recovery = 119%  Expected Conc. = 3 
 Median Pct Recovery = 119%  Expected Conc. = 1.696 
 Median Pct Recovery = 119%  Expected Conc. = 1.696 
 Median Pct Recovery = 119%  Expected Conc. = 1.696 
 Median Pct Recovery = 119%  Expected Conc. = 1.696 
 Median Pct Recovery = 119%  Expected Conc. = 1.696 
 Median Pct Recovery = 119%  Expected Conc. = 1.696 
 Median Pct Recovery = 119%  Expected Conc. = 0.252 
 Median Pct Recovery = 119%  Expected Conc. = 0.252 
 Median Pct Recovery = 119%  Expected Conc. = 0.252 
 Median Pct Recovery = 119%  Expected Conc. = 0.252 
 Median Pct Recovery = 119%  Expected Conc. = 0.252 
 Median Pct Recovery = 119%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 97%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 141%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 135%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 127%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 130%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 122%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 104%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 114%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 141%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 117%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 107%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 121%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Median Pct Recovery = 119%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
DICHLOROMETHANE
METHOD: 4054 , TESTIDCODE: 34423GCM66
DATES: 01/11/00 - 10/04/03

 Expected Conc. = 5.958 
 Median Pct Recovery = 107%  Expected Conc. = 5.958 
 Median Pct Recovery = 107%  Expected Conc. = 5.958 
 Median Pct Recovery = 107%  Expected Conc. = 5.958 
 Median Pct Recovery = 107%  Expected Conc. = 5.958 
 Median Pct Recovery = 107%  Expected Conc. = 5.9 
 Median Pct Recovery = 107%  Expected Conc. = 5.9 
 Median Pct Recovery = 107%  Expected Conc. = 5.9 
 Median Pct Recovery = 107%  Expected Conc. = 5.9 
 Median Pct Recovery = 107%  Expected Conc. = 5.9 
 Median Pct Recovery = 107%  Expected Conc. = 5.9 
 Median Pct Recovery = 107%  Expected Conc. = 4.416 
 Median Pct Recovery = 107%  Expected Conc. = 4.416 
 Median Pct Recovery = 107%  Expected Conc. = 4.416 
 Median Pct Recovery = 107%  Expected Conc. = 4.416 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 1.8 
 Median Pct Recovery = 107%  Expected Conc. = 1.8 
 Median Pct Recovery = 107%  Expected Conc. = 1.8 
 Median Pct Recovery = 107%  Expected Conc. = 1.8 
 Median Pct Recovery = 107%  Expected Conc. = 1.18 
 Median Pct Recovery = 107%  Expected Conc. = 1.18 
 Median Pct Recovery = 107%  Expected Conc. = 1.18 
 Median Pct Recovery = 107%  Expected Conc. = 1.18 
 Median Pct Recovery = 107%  Expected Conc. = 0.8832 
 Median Pct Recovery = 107%  Expected Conc. = 0.8832 
 Median Pct Recovery = 107%  Expected Conc. = 0.8832 
 Median Pct Recovery = 107%  Expected Conc. = 0.8832 
 Median Pct Recovery = 107%  Expected Conc. = 0.8832 
 Median Pct Recovery = 107%  Expected Conc. = 0.8832 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 107%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 111%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 103%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 102%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 102%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 109%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 102%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 101%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 102%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 105%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 114%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 118%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 113%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 106%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 124%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 113%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 117%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 102%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 99%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 200%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 200%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TETRACHLOROETHYLENE
METHOD: 4054 , TESTIDCODE: 34475GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.464 
 Median Pct Recovery = 99%  Expected Conc. = 6.464 
 Median Pct Recovery = 99%  Expected Conc. = 6.464 
 Median Pct Recovery = 99%  Expected Conc. = 6.36 
 Median Pct Recovery = 99%  Expected Conc. = 6.36 
 Median Pct Recovery = 99%  Expected Conc. = 6.36 
 Median Pct Recovery = 99%  Expected Conc. = 6.36 
 Median Pct Recovery = 99%  Expected Conc. = 6.36 
 Median Pct Recovery = 99%  Expected Conc. = 6.36 
 Median Pct Recovery = 99%  Expected Conc. = 5.5 
 Median Pct Recovery = 99%  Expected Conc. = 5.5 
 Median Pct Recovery = 99%  Expected Conc. = 5.5 
 Median Pct Recovery = 99%  Expected Conc. = 5.5 
 Median Pct Recovery = 99%  Expected Conc. = 5.5 
 Median Pct Recovery = 99%  Expected Conc. = 5.5 
 Median Pct Recovery = 99%  Expected Conc. = 1.2928 
 Median Pct Recovery = 99%  Expected Conc. = 1.2928 
 Median Pct Recovery = 99%  Expected Conc. = 1.2928 
 Median Pct Recovery = 99%  Expected Conc. = 1.2928 
 Median Pct Recovery = 99%  Expected Conc. = 1.2928 
 Median Pct Recovery = 99%  Expected Conc. = 1.2928 
 Median Pct Recovery = 99%  Expected Conc. = 1.1 
 Median Pct Recovery = 99%  Expected Conc. = 1.1 
 Median Pct Recovery = 99%  Expected Conc. = 1.1 
 Median Pct Recovery = 99%  Expected Conc. = 1.1 
 Median Pct Recovery = 99%  Expected Conc. = 1.1 
 Median Pct Recovery = 99%  Expected Conc. = 1.1 
 Median Pct Recovery = 99%  Expected Conc. = 1.1 
 Median Pct Recovery = 99%  Expected Conc. = 1.1 
 Median Pct Recovery = 99%  Expected Conc. = 0.348 
 Median Pct Recovery = 99%  Expected Conc. = 0.348 
 Median Pct Recovery = 99%  Expected Conc. = 0.348 
 Median Pct Recovery = 99%  Expected Conc. = 0.348 
 Median Pct Recovery = 99%  Expected Conc. = 0.348 
 Median Pct Recovery = 99%  Expected Conc. = 0.348 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 99%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 98%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 95%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 108%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 98%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 102%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 95%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 106%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 98%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 87%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 109%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 103%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 115%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 95%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 99%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 97%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 99%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 111%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 122%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 101%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TRICHLOROFLUOROMETHANE
METHOD: 4054 , TESTIDCODE: 34488GCM66
DATES: 02/23/00 - 07/09/03

 Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 4.4 
 Median Pct Recovery = 124%  Expected Conc. = 1.76 
 Median Pct Recovery = 124%  Expected Conc. = 1.76 
 Median Pct Recovery = 124%  Expected Conc. = 1.76 
 Median Pct Recovery = 124%  Expected Conc. = 1.76 
 Median Pct Recovery = 124%  Expected Conc. = 1.76 
 Median Pct Recovery = 124%  Expected Conc. = 1.76 
 Median Pct Recovery = 124%  Expected Conc. = 0.9 
 Median Pct Recovery = 124%  Expected Conc. = 0.9 
 Median Pct Recovery = 124%  Expected Conc. = 0.9 
 Median Pct Recovery = 124%  Expected Conc. = 0.9 
 Median Pct Recovery = 124%  Expected Conc. = 0.236 
 Median Pct Recovery = 124%  Expected Conc. = 0.236 
 Median Pct Recovery = 124%  Expected Conc. = 0.236 
 Median Pct Recovery = 124%  Expected Conc. = 0.236 
 Median Pct Recovery = 124%  Expected Conc. = 0.236 
 Median Pct Recovery = 124%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 122%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 124%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 149%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 140%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 135%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 93%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 114%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 131%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 124%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 109%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 97%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 127%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 133%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 121%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Median Pct Recovery = 124%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,1-DICHLOROETHANE
METHOD: 4054 , TESTIDCODE: 34496GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.436 
 Median Pct Recovery = 105%  Expected Conc. = 5.436 
 Median Pct Recovery = 105%  Expected Conc. = 5.436 
 Median Pct Recovery = 105%  Expected Conc. = 5.436 
 Median Pct Recovery = 105%  Expected Conc. = 5.436 
 Median Pct Recovery = 105%  Expected Conc. = 5.436 
 Median Pct Recovery = 105%  Expected Conc. = 5.016 
 Median Pct Recovery = 105%  Expected Conc. = 5.016 
 Median Pct Recovery = 105%  Expected Conc. = 5.016 
 Median Pct Recovery = 105%  Expected Conc. = 5.016 
 Median Pct Recovery = 105%  Expected Conc. = 1.18 
 Median Pct Recovery = 105%  Expected Conc. = 1.18 
 Median Pct Recovery = 105%  Expected Conc. = 1.18 
 Median Pct Recovery = 105%  Expected Conc. = 1.18 
 Median Pct Recovery = 105%  Expected Conc. = 1.0032 
 Median Pct Recovery = 105%  Expected Conc. = 1.0032 
 Median Pct Recovery = 105%  Expected Conc. = 1.0032 
 Median Pct Recovery = 105%  Expected Conc. = 1.0032 
 Median Pct Recovery = 105%  Expected Conc. = 1.0032 
 Median Pct Recovery = 105%  Expected Conc. = 1.0032 
 Median Pct Recovery = 105%  Expected Conc. = 0.7 
 Median Pct Recovery = 105%  Expected Conc. = 0.7 
 Median Pct Recovery = 105%  Expected Conc. = 0.7 
 Median Pct Recovery = 105%  Expected Conc. = 0.7 
 Median Pct Recovery = 105%  Expected Conc. = 0.272 
 Median Pct Recovery = 105%  Expected Conc. = 0.272 
 Median Pct Recovery = 105%  Expected Conc. = 0.272 
 Median Pct Recovery = 105%  Expected Conc. = 0.272 
 Median Pct Recovery = 105%  Expected Conc. = 0.272 
 Median Pct Recovery = 105%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 108%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 104%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 114%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 93%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 111%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 101%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 103%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 105%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 113%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 106%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 116%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 97%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 104%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 98%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 102%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 118%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,1-DICHLOROETHYLENE
METHOD: 4054 , TESTIDCODE: 34501GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.78 
 Median Pct Recovery = 100%  Expected Conc. = 6.78 
 Median Pct Recovery = 100%  Expected Conc. = 6.78 
 Median Pct Recovery = 100%  Expected Conc. = 6.78 
 Median Pct Recovery = 100%  Expected Conc. = 6.78 
 Median Pct Recovery = 100%  Expected Conc. = 6.456 
 Median Pct Recovery = 100%  Expected Conc. = 6.456 
 Median Pct Recovery = 100%  Expected Conc. = 6.456 
 Median Pct Recovery = 100%  Expected Conc. = 6.456 
 Median Pct Recovery = 100%  Expected Conc. = 4.275 
 Median Pct Recovery = 100%  Expected Conc. = 4.275 
 Median Pct Recovery = 100%  Expected Conc. = 4.275 
 Median Pct Recovery = 100%  Expected Conc. = 4.275 
 Median Pct Recovery = 100%  Expected Conc. = 4.275 
 Median Pct Recovery = 100%  Expected Conc. = 4.275 
 Median Pct Recovery = 100%  Expected Conc. = 1.2912 
 Median Pct Recovery = 100%  Expected Conc. = 1.2912 
 Median Pct Recovery = 100%  Expected Conc. = 1.2912 
 Median Pct Recovery = 100%  Expected Conc. = 1.2912 
 Median Pct Recovery = 100%  Expected Conc. = 1.2912 
 Median Pct Recovery = 100%  Expected Conc. = 1.2912 
 Median Pct Recovery = 100%  Expected Conc. = 0.855 
 Median Pct Recovery = 100%  Expected Conc. = 0.855 
 Median Pct Recovery = 100%  Expected Conc. = 0.855 
 Median Pct Recovery = 100%  Expected Conc. = 0.855 
 Median Pct Recovery = 100%  Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.272 
 Median Pct Recovery = 100%  Expected Conc. = 0.272 
 Median Pct Recovery = 100%  Expected Conc. = 0.272 
 Median Pct Recovery = 100%  Expected Conc. = 0.272 
 Median Pct Recovery = 100%  Expected Conc. = 0.272 
 Median Pct Recovery = 100%  Expected Conc. = 0.272 
 Median Pct Recovery = 100%  Expected Conc. = 0.21 
 Median Pct Recovery = 100%  Expected Conc. = 0.21 
 Median Pct Recovery = 100%  Expected Conc. = 0.21 
 Median Pct Recovery = 100%  Expected Conc. = 0.21 
 Median Pct Recovery = 100%  Expected Conc. = 0.21 
 Median Pct Recovery = 100%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 100%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 118%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 100%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 111%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 110%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 91%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 89%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 96%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 107%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 108%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 150%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 100%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 91%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 100%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 122%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 99%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 105%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,1,1-TRICHLOROETHANE
METHOD: 4054 , TESTIDCODE: 34506GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 7 
 Median Pct Recovery = 106%  Expected Conc. = 7 
 Median Pct Recovery = 106%  Expected Conc. = 7 
 Median Pct Recovery = 106%  Expected Conc. = 6.24 
 Median Pct Recovery = 106%  Expected Conc. = 6.24 
 Median Pct Recovery = 106%  Expected Conc. = 6.24 
 Median Pct Recovery = 106%  Expected Conc. = 6.24 
 Median Pct Recovery = 106%  Expected Conc. = 6.24 
 Median Pct Recovery = 106%  Expected Conc. = 6.24 
 Median Pct Recovery = 106%  Expected Conc. = 5.7 
 Median Pct Recovery = 106%  Expected Conc. = 5.7 
 Median Pct Recovery = 106%  Expected Conc. = 5.7 
 Median Pct Recovery = 106%  Expected Conc. = 5.7 
 Median Pct Recovery = 106%  Expected Conc. = 5.7 
 Median Pct Recovery = 106%  Expected Conc. = 5.7 
 Median Pct Recovery = 106%  Expected Conc. = 1.4 
 Median Pct Recovery = 106%  Expected Conc. = 1.4 
 Median Pct Recovery = 106%  Expected Conc. = 1.4 
 Median Pct Recovery = 106%  Expected Conc. = 1.4 
 Median Pct Recovery = 106%  Expected Conc. = 1.4 
 Median Pct Recovery = 106%  Expected Conc. = 1.4 
 Median Pct Recovery = 106%  Expected Conc. = 1.14 
 Median Pct Recovery = 106%  Expected Conc. = 1.14 
 Median Pct Recovery = 106%  Expected Conc. = 1.14 
 Median Pct Recovery = 106%  Expected Conc. = 1.14 
 Median Pct Recovery = 106%  Expected Conc. = 0.5 
 Median Pct Recovery = 106%  Expected Conc. = 0.5 
 Median Pct Recovery = 106%  Expected Conc. = 0.5 
 Median Pct Recovery = 106%  Expected Conc. = 0.5 
 Median Pct Recovery = 106%  Expected Conc. = 0.272 
 Median Pct Recovery = 106%  Expected Conc. = 0.272 
 Median Pct Recovery = 106%  Expected Conc. = 0.272 
 Median Pct Recovery = 106%  Expected Conc. = 0.272 
 Median Pct Recovery = 106%  Expected Conc. = 0.272 
 Median Pct Recovery = 106%  Expected Conc. = 0.272 
 Median Pct Recovery = 106%  Expected Conc. = 0.27 
 Median Pct Recovery = 106%  Expected Conc. = 0.27 
 Median Pct Recovery = 106%  Expected Conc. = 0.27 
 Median Pct Recovery = 106%  Expected Conc. = 0.27 
 Median Pct Recovery = 106%  Expected Conc. = 0.27 
 Median Pct Recovery = 106%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 108%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 104%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 97%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 104%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 104%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 104%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 92%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 112%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 106%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 90%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 114%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 111%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 96%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 107%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 89%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 108%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 119%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 109%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 107%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 106%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 104%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,1,2-TRICHLOROETHANE
METHOD: 4054 , TESTIDCODE: 34511GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.6 
 Median Pct Recovery = 107%  Expected Conc. = 0.6 
 Median Pct Recovery = 107%  Expected Conc. = 0.6 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Expected Conc. = 0.272 
 Median Pct Recovery = 107%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 111%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 107%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 119%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 101%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,1,2,2-TETRACHLOROETHANE
METHOD: 4054 , TESTIDCODE: 34516GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.436 
 Median Pct Recovery = 103%  Expected Conc. = 5.436 
 Median Pct Recovery = 103%  Expected Conc. = 5.436 
 Median Pct Recovery = 103%  Expected Conc. = 5.436 
 Median Pct Recovery = 103%  Expected Conc. = 5.436 
 Median Pct Recovery = 103%  Expected Conc. = 4.744 
 Median Pct Recovery = 103%  Expected Conc. = 4.744 
 Median Pct Recovery = 103%  Expected Conc. = 4.744 
 Median Pct Recovery = 103%  Expected Conc. = 4.744 
 Median Pct Recovery = 103%  Expected Conc. = 4.105 
 Median Pct Recovery = 103%  Expected Conc. = 4.105 
 Median Pct Recovery = 103%  Expected Conc. = 4.105 
 Median Pct Recovery = 103%  Expected Conc. = 4.105 
 Median Pct Recovery = 103%  Expected Conc. = 4.105 
 Median Pct Recovery = 103%  Expected Conc. = 4.105 
 Median Pct Recovery = 103%  Expected Conc. = 1.3 
 Median Pct Recovery = 103%  Expected Conc. = 1.3 
 Median Pct Recovery = 103%  Expected Conc. = 1.3 
 Median Pct Recovery = 103%  Expected Conc. = 1.3 
 Median Pct Recovery = 103%  Expected Conc. = 0.9488 
 Median Pct Recovery = 103%  Expected Conc. = 0.9488 
 Median Pct Recovery = 103%  Expected Conc. = 0.9488 
 Median Pct Recovery = 103%  Expected Conc. = 0.9488 
 Median Pct Recovery = 103%  Expected Conc. = 0.9488 
 Median Pct Recovery = 103%  Expected Conc. = 0.9488 
 Median Pct Recovery = 103%  Expected Conc. = 0.821 
 Median Pct Recovery = 103%  Expected Conc. = 0.821 
 Median Pct Recovery = 103%  Expected Conc. = 0.821 
 Median Pct Recovery = 103%  Expected Conc. = 0.821 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Expected Conc. = 0.272 
 Median Pct Recovery = 103%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 102%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 117%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 99%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 107%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 95%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 90%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 95%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 95%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 103%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 103%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 110%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 106%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 101%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 112%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 114%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 114%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 101%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2-DICHLOROBENZENE
METHOD: 4054 , TESTIDCODE: 34536GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.448 
 Median Pct Recovery = 99%  Expected Conc. = 5.448 
 Median Pct Recovery = 99%  Expected Conc. = 5.448 
 Median Pct Recovery = 99%  Expected Conc. = 5.448 
 Median Pct Recovery = 99%  Expected Conc. = 5.448 
 Median Pct Recovery = 99%  Expected Conc. = 5.35 
 Median Pct Recovery = 99%  Expected Conc. = 5.35 
 Median Pct Recovery = 99%  Expected Conc. = 5.35 
 Median Pct Recovery = 99%  Expected Conc. = 5.35 
 Median Pct Recovery = 99%  Expected Conc. = 5.35 
 Median Pct Recovery = 99%  Expected Conc. = 5.35 
 Median Pct Recovery = 99%  Expected Conc. = 4.808 
 Median Pct Recovery = 99%  Expected Conc. = 4.808 
 Median Pct Recovery = 99%  Expected Conc. = 4.808 
 Median Pct Recovery = 99%  Expected Conc. = 4.808 
 Median Pct Recovery = 99%  Expected Conc. = 1.07 
 Median Pct Recovery = 99%  Expected Conc. = 1.07 
 Median Pct Recovery = 99%  Expected Conc. = 1.07 
 Median Pct Recovery = 99%  Expected Conc. = 1.07 
 Median Pct Recovery = 99%  Expected Conc. = 0.9616 
 Median Pct Recovery = 99%  Expected Conc. = 0.9616 
 Median Pct Recovery = 99%  Expected Conc. = 0.9616 
 Median Pct Recovery = 99%  Expected Conc. = 0.9616 
 Median Pct Recovery = 99%  Expected Conc. = 0.9616 
 Median Pct Recovery = 99%  Expected Conc. = 0.9616 
 Median Pct Recovery = 99%  Expected Conc. = 0.5 
 Median Pct Recovery = 99%  Expected Conc. = 0.5 
 Median Pct Recovery = 99%  Expected Conc. = 0.5 
 Median Pct Recovery = 99%  Expected Conc. = 0.5 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Expected Conc. = 0.216 
 Median Pct Recovery = 99%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 106%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 110%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 99%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 88%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 90%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 94%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 106%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 94%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 91%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 100%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 99%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 95%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 98%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 105%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 109%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 99%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 108%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2-DICHLOROPROPANE
METHOD: 4054 , TESTIDCODE: 34541GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.42 
 Median Pct Recovery = 101%  Expected Conc. = 6.42 
 Median Pct Recovery = 101%  Expected Conc. = 6.42 
 Median Pct Recovery = 101%  Expected Conc. = 6.42 
 Median Pct Recovery = 101%  Expected Conc. = 6.42 
 Median Pct Recovery = 101%  Expected Conc. = 5.752 
 Median Pct Recovery = 101%  Expected Conc. = 5.752 
 Median Pct Recovery = 101%  Expected Conc. = 5.752 
 Median Pct Recovery = 101%  Expected Conc. = 5.752 
 Median Pct Recovery = 101%  Expected Conc. = 5 
 Median Pct Recovery = 101%  Expected Conc. = 5 
 Median Pct Recovery = 101%  Expected Conc. = 5 
 Median Pct Recovery = 101%  Expected Conc. = 5 
 Median Pct Recovery = 101%  Expected Conc. = 5 
 Median Pct Recovery = 101%  Expected Conc. = 5 
 Median Pct Recovery = 101%  Expected Conc. = 1.1504 
 Median Pct Recovery = 101%  Expected Conc. = 1.1504 
 Median Pct Recovery = 101%  Expected Conc. = 1.1504 
 Median Pct Recovery = 101%  Expected Conc. = 1.1504 
 Median Pct Recovery = 101%  Expected Conc. = 1.1504 
 Median Pct Recovery = 101%  Expected Conc. = 1.1504 
 Median Pct Recovery = 101%  Expected Conc. = 1 
 Median Pct Recovery = 101%  Expected Conc. = 1 
 Median Pct Recovery = 101%  Expected Conc. = 1 
 Median Pct Recovery = 101%  Expected Conc. = 1 
 Median Pct Recovery = 101%  Expected Conc. = 0.7 
 Median Pct Recovery = 101%  Expected Conc. = 0.7 
 Median Pct Recovery = 101%  Expected Conc. = 0.7 
 Median Pct Recovery = 101%  Expected Conc. = 0.7 
 Median Pct Recovery = 101%  Expected Conc. = 0.272 
 Median Pct Recovery = 101%  Expected Conc. = 0.272 
 Median Pct Recovery = 101%  Expected Conc. = 0.272 
 Median Pct Recovery = 101%  Expected Conc. = 0.272 
 Median Pct Recovery = 101%  Expected Conc. = 0.272 
 Median Pct Recovery = 101%  Expected Conc. = 0.272 
 Median Pct Recovery = 101%  Expected Conc. = 0.18 
 Median Pct Recovery = 101%  Expected Conc. = 0.18 
 Median Pct Recovery = 101%  Expected Conc. = 0.18 
 Median Pct Recovery = 101%  Expected Conc. = 0.18 
 Median Pct Recovery = 101%  Expected Conc. = 0.18 
 Median Pct Recovery = 101%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 103%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 119%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 101%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 101%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 100%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 93%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 96%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 101%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 106%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 96%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 109%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 100%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 98%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 108%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 105%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 99%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 98%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 96%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TRANS-1,2-DICHLOROETHYLENE
METHOD: 4054 , TESTIDCODE: 34546GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.264 
 Median Pct Recovery = 100%  Expected Conc. = 0.264 
 Median Pct Recovery = 100%  Expected Conc. = 0.264 
 Median Pct Recovery = 100%  Expected Conc. = 0.264 
 Median Pct Recovery = 100%  Expected Conc. = 0.264 
 Median Pct Recovery = 100%  Expected Conc. = 0.264 
 Median Pct Recovery = 100%  Expected Conc. = 0.16 
 Median Pct Recovery = 100%  Expected Conc. = 0.16 
 Median Pct Recovery = 100%  Expected Conc. = 0.16 
 Median Pct Recovery = 100%  Expected Conc. = 0.16 
 Median Pct Recovery = 100%  Expected Conc. = 0.16 
 Median Pct Recovery = 100%  Expected Conc. = 0.16 
 Median Pct Recovery = 100%  Expected Conc. = 0.0098 
 Median Pct Recovery = 100%  Expected Conc. = 0.0098 
 Median Pct Recovery = 100%  Expected Conc. = 0.0098 
 Median Pct Recovery = 100%  Expected Conc. = 0.0098 
 Median Pct Recovery = 100%  Expected Conc. = 0.0098 
 Median Pct Recovery = 100%  Expected Conc. = 0.0098 
 Median Pct Recovery = 100%  Expected Conc. = 0.002 
 Median Pct Recovery = 100%  Expected Conc. = 0.002 
 Median Pct Recovery = 100%  Expected Conc. = 0.002 
 Median Pct Recovery = 100%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 100%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 99%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 97%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 92%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 100%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 123%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 134%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 127%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2,4-TRICHLOROBENZENE
METHOD: 4054 , TESTIDCODE: 34551GCM66
DATES: 02/23/00 - 10/04/03

 Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 4.84 
 Median Pct Recovery = 92%  Expected Conc. = 3.188 
 Median Pct Recovery = 92%  Expected Conc. = 3.188 
 Median Pct Recovery = 92%  Expected Conc. = 3.188 
 Median Pct Recovery = 92%  Expected Conc. = 3.188 
 Median Pct Recovery = 92%  Expected Conc. = 3.188 
 Median Pct Recovery = 92%  Expected Conc. = 3.188 
 Median Pct Recovery = 92%  Expected Conc. = 1.936 
 Median Pct Recovery = 92%  Expected Conc. = 1.936 
 Median Pct Recovery = 92%  Expected Conc. = 1.936 
 Median Pct Recovery = 92%  Expected Conc. = 1.936 
 Median Pct Recovery = 92%  Expected Conc. = 1.936 
 Median Pct Recovery = 92%  Expected Conc. = 1.936 
 Median Pct Recovery = 92%  Expected Conc. = 1.9 
 Median Pct Recovery = 92%  Expected Conc. = 1.9 
 Median Pct Recovery = 92%  Expected Conc. = 1.9 
 Median Pct Recovery = 92%  Expected Conc. = 1.9 
 Median Pct Recovery = 92%  Expected Conc. = 0.28 
 Median Pct Recovery = 92%  Expected Conc. = 0.28 
 Median Pct Recovery = 92%  Expected Conc. = 0.28 
 Median Pct Recovery = 92%  Expected Conc. = 0.28 
 Median Pct Recovery = 92%  Expected Conc. = 0.28 
 Median Pct Recovery = 92%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 102%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 115%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 100%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 86%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 88%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 88%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 75%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 99%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 83%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 92%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 90%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 102%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 95%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 103%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 83%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 117%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 90%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,3-DICHLOROBENZENE
METHOD: 4054 , TESTIDCODE: 34566GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.632 
 Median Pct Recovery = 97%  Expected Conc. = 5.632 
 Median Pct Recovery = 97%  Expected Conc. = 5.632 
 Median Pct Recovery = 97%  Expected Conc. = 5.478 
 Median Pct Recovery = 97%  Expected Conc. = 5.478 
 Median Pct Recovery = 97%  Expected Conc. = 5.478 
 Median Pct Recovery = 97%  Expected Conc. = 5.478 
 Median Pct Recovery = 97%  Expected Conc. = 5.478 
 Median Pct Recovery = 97%  Expected Conc. = 5.478 
 Median Pct Recovery = 97%  Expected Conc. = 4.77 
 Median Pct Recovery = 97%  Expected Conc. = 4.77 
 Median Pct Recovery = 97%  Expected Conc. = 4.77 
 Median Pct Recovery = 97%  Expected Conc. = 4.77 
 Median Pct Recovery = 97%  Expected Conc. = 4.77 
 Median Pct Recovery = 97%  Expected Conc. = 4.77 
 Median Pct Recovery = 97%  Expected Conc. = 1.1264 
 Median Pct Recovery = 97%  Expected Conc. = 1.1264 
 Median Pct Recovery = 97%  Expected Conc. = 1.1264 
 Median Pct Recovery = 97%  Expected Conc. = 1.1264 
 Median Pct Recovery = 97%  Expected Conc. = 1.1264 
 Median Pct Recovery = 97%  Expected Conc. = 1.1264 
 Median Pct Recovery = 97%  Expected Conc. = 0.954 
 Median Pct Recovery = 97%  Expected Conc. = 0.954 
 Median Pct Recovery = 97%  Expected Conc. = 0.954 
 Median Pct Recovery = 97%  Expected Conc. = 0.954 
 Median Pct Recovery = 97%  Expected Conc. = 0.5 
 Median Pct Recovery = 97%  Expected Conc. = 0.5 
 Median Pct Recovery = 97%  Expected Conc. = 0.5 
 Median Pct Recovery = 97%  Expected Conc. = 0.5 
 Median Pct Recovery = 97%  Expected Conc. = 0.216 
 Median Pct Recovery = 97%  Expected Conc. = 0.216 
 Median Pct Recovery = 97%  Expected Conc. = 0.216 
 Median Pct Recovery = 97%  Expected Conc. = 0.216 
 Median Pct Recovery = 97%  Expected Conc. = 0.216 
 Median Pct Recovery = 97%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 104%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 93%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 104%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 110%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 98%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 88%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 92%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 94%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 98%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 91%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 91%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 92%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 93%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 107%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 109%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 96%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 99%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,4-DICHLOROBENZENE
METHOD: 4054 , TESTIDCODE: 34571GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.032 
 Median Pct Recovery = 95%  Expected Conc. = 6.032 
 Median Pct Recovery = 95%  Expected Conc. = 6.032 
 Median Pct Recovery = 95%  Expected Conc. = 5.802 
 Median Pct Recovery = 95%  Expected Conc. = 5.802 
 Median Pct Recovery = 95%  Expected Conc. = 5.802 
 Median Pct Recovery = 95%  Expected Conc. = 5.802 
 Median Pct Recovery = 95%  Expected Conc. = 5.802 
 Median Pct Recovery = 95%  Expected Conc. = 5.802 
 Median Pct Recovery = 95%  Expected Conc. = 4.19 
 Median Pct Recovery = 95%  Expected Conc. = 4.19 
 Median Pct Recovery = 95%  Expected Conc. = 4.19 
 Median Pct Recovery = 95%  Expected Conc. = 4.19 
 Median Pct Recovery = 95%  Expected Conc. = 4.19 
 Median Pct Recovery = 95%  Expected Conc. = 4.19 
 Median Pct Recovery = 95%  Expected Conc. = 1.2064 
 Median Pct Recovery = 95%  Expected Conc. = 1.2064 
 Median Pct Recovery = 95%  Expected Conc. = 1.2064 
 Median Pct Recovery = 95%  Expected Conc. = 1.2064 
 Median Pct Recovery = 95%  Expected Conc. = 1.2064 
 Median Pct Recovery = 95%  Expected Conc. = 1.2064 
 Median Pct Recovery = 95%  Expected Conc. = 0.838 
 Median Pct Recovery = 95%  Expected Conc. = 0.838 
 Median Pct Recovery = 95%  Expected Conc. = 0.838 
 Median Pct Recovery = 95%  Expected Conc. = 0.838 
 Median Pct Recovery = 95%  Expected Conc. = 0.5 
 Median Pct Recovery = 95%  Expected Conc. = 0.5 
 Median Pct Recovery = 95%  Expected Conc. = 0.5 
 Median Pct Recovery = 95%  Expected Conc. = 0.5 
 Median Pct Recovery = 95%  Expected Conc. = 0.33 
 Median Pct Recovery = 95%  Expected Conc. = 0.33 
 Median Pct Recovery = 95%  Expected Conc. = 0.33 
 Median Pct Recovery = 95%  Expected Conc. = 0.33 
 Median Pct Recovery = 95%  Expected Conc. = 0.33 
 Median Pct Recovery = 95%  Expected Conc. = 0.33 
 Median Pct Recovery = 95%  Expected Conc. = 0.216 
 Median Pct Recovery = 95%  Expected Conc. = 0.216 
 Median Pct Recovery = 95%  Expected Conc. = 0.216 
 Median Pct Recovery = 95%  Expected Conc. = 0.216 
 Median Pct Recovery = 95%  Expected Conc. = 0.216 
 Median Pct Recovery = 95%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 106%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 90%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 112%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 116%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 97%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 87%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 93%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 95%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 100%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 86%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 88%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 93%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 91%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 102%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 105%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 86%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 86%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 101%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 99%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 97%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
DICHLORODIFLUOROMETHANE
METHOD: 4054 , TESTIDCODE: 34668GCM66
DATES: 02/23/00 - 07/09/03

 Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3.6 
 Median Pct Recovery = 113%  Expected Conc. = 3 
 Median Pct Recovery = 113%  Expected Conc. = 3 
 Median Pct Recovery = 113%  Expected Conc. = 3 
 Median Pct Recovery = 113%  Expected Conc. = 3 
 Median Pct Recovery = 113%  Expected Conc. = 1.44 
 Median Pct Recovery = 113%  Expected Conc. = 1.44 
 Median Pct Recovery = 113%  Expected Conc. = 1.44 
 Median Pct Recovery = 113%  Expected Conc. = 1.44 
 Median Pct Recovery = 113%  Expected Conc. = 1.44 
 Median Pct Recovery = 113%  Expected Conc. = 1.44 
 Median Pct Recovery = 113%  Expected Conc. = 0.256 
 Median Pct Recovery = 113%  Expected Conc. = 0.256 
 Median Pct Recovery = 113%  Expected Conc. = 0.256 
 Median Pct Recovery = 113%  Expected Conc. = 0.256 
 Median Pct Recovery = 113%  Expected Conc. = 0.256 
 Median Pct Recovery = 113%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 97%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 168%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 155%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 99%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 115%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 100%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 111%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 109%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 111%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 133%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 100%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 161%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 200%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 142%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Median Pct Recovery = 113%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
NAPHTHALENE
METHOD: 4054 , TESTIDCODE: 34696GCM66
DATES: 02/23/00 - 10/04/03

 Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.52 
 Median Pct Recovery = 92%  Expected Conc. = 3.2 
 Median Pct Recovery = 92%  Expected Conc. = 3.2 
 Median Pct Recovery = 92%  Expected Conc. = 3.2 
 Median Pct Recovery = 92%  Expected Conc. = 3.2 
 Median Pct Recovery = 92%  Expected Conc. = 3.2 
 Median Pct Recovery = 92%  Expected Conc. = 3.2 
 Median Pct Recovery = 92%  Expected Conc. = 2.5 
 Median Pct Recovery = 92%  Expected Conc. = 2.5 
 Median Pct Recovery = 92%  Expected Conc. = 2.5 
 Median Pct Recovery = 92%  Expected Conc. = 2.5 
 Median Pct Recovery = 92%  Expected Conc. = 1.408 
 Median Pct Recovery = 92%  Expected Conc. = 1.408 
 Median Pct Recovery = 92%  Expected Conc. = 1.408 
 Median Pct Recovery = 92%  Expected Conc. = 1.408 
 Median Pct Recovery = 92%  Expected Conc. = 1.408 
 Median Pct Recovery = 92%  Expected Conc. = 1.408 
 Median Pct Recovery = 92%  Expected Conc. = 0.324 
 Median Pct Recovery = 92%  Expected Conc. = 0.324 
 Median Pct Recovery = 92%  Expected Conc. = 0.16 
 Median Pct Recovery = 92%  Expected Conc. = 0.16 
 Median Pct Recovery = 92%  Expected Conc. = 0.16 
 Median Pct Recovery = 92%  Expected Conc. = 0.16 
 Median Pct Recovery = 92%  Expected Conc. = 0.16 
 Median Pct Recovery = 92%  Expected Conc. = 0.16 
 Median Pct Recovery = 92%  Expected Conc. = 0.324 
 Median Pct Recovery = 92%  Expected Conc. = 0.324 
 Median Pct Recovery = 92%  Expected Conc. = 0.324 
 Median Pct Recovery = 92%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 96%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 113%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 102%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 98%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 75%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 85%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 67%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 103%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 75%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 92%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 80%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 73%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 92%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 78%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 86%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 129%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 108%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Median Pct Recovery = 92%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TRANS-1,3-DICHLOROPROPENE
METHOD: 4054 , TESTIDCODE: 34699GCM66
DATES: 02/23/00 - 07/09/03

 Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 3.2 
 Median Pct Recovery = 95%  Expected Conc. = 1.3 
 Median Pct Recovery = 95%  Expected Conc. = 1.3 
 Median Pct Recovery = 95%  Expected Conc. = 1.3 
 Median Pct Recovery = 95%  Expected Conc. = 1.3 
 Median Pct Recovery = 95%  Expected Conc. = 1.28 
 Median Pct Recovery = 95%  Expected Conc. = 1.28 
 Median Pct Recovery = 95%  Expected Conc. = 1.28 
 Median Pct Recovery = 95%  Expected Conc. = 1.28 
 Median Pct Recovery = 95%  Expected Conc. = 1.28 
 Median Pct Recovery = 95%  Expected Conc. = 1.28 
 Median Pct Recovery = 95%  Expected Conc. = 0.272 
 Median Pct Recovery = 95%  Expected Conc. = 0.272 
 Median Pct Recovery = 95%  Expected Conc. = 0.272 
 Median Pct Recovery = 95%  Expected Conc. = 0.272 
 Median Pct Recovery = 95%  Expected Conc. = 0.272 
 Median Pct Recovery = 95%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 89%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 114%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 105%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 110%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 87%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 91%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 103%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 94%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 95%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 103%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 100%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 80%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 96%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 92%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Median Pct Recovery = 95%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
CIS-1,3-DICHLOROPROPENE
METHOD: 4054 , TESTIDCODE: 34704GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.9 
 Median Pct Recovery = 99%  Expected Conc. = 0.9 
 Median Pct Recovery = 99%  Expected Conc. = 0.9 
 Median Pct Recovery = 99%  Expected Conc. = 0.272 
 Median Pct Recovery = 99%  Expected Conc. = 0.272 
 Median Pct Recovery = 99%  Expected Conc. = 0.272 
 Median Pct Recovery = 99%  Expected Conc. = 0.272 
 Median Pct Recovery = 99%  Expected Conc. = 0.272 
 Median Pct Recovery = 99%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 116%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 81%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 102%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
VINYL CHLORIDE
METHOD: 4054 , TESTIDCODE: 39175GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 1.1 
 Median Pct Recovery = 112%  Expected Conc. = 1.1 
 Median Pct Recovery = 112%  Expected Conc. = 1.1 
 Median Pct Recovery = 112%  Expected Conc. = 0.244 
 Median Pct Recovery = 112%  Expected Conc. = 0.244 
 Median Pct Recovery = 112%  Expected Conc. = 0.244 
 Median Pct Recovery = 112%  Expected Conc. = 0.244 
 Median Pct Recovery = 112%  Expected Conc. = 0.244 
 Median Pct Recovery = 112%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 104%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 112%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 128%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 118%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Median Pct Recovery = 112%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TRICHLOROETHYLENE
METHOD: 4054 , TESTIDCODE: 39180GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.9 
 Median Pct Recovery = 105%  Expected Conc. = 5.106 
 Median Pct Recovery = 105%  Expected Conc. = 5.106 
 Median Pct Recovery = 105%  Expected Conc. = 5.106 
 Median Pct Recovery = 105%  Expected Conc. = 5.106 
 Median Pct Recovery = 105%  Expected Conc. = 5.106 
 Median Pct Recovery = 105%  Expected Conc. = 5.106 
 Median Pct Recovery = 105%  Expected Conc. = 4.984 
 Median Pct Recovery = 105%  Expected Conc. = 4.984 
 Median Pct Recovery = 105%  Expected Conc. = 4.984 
 Median Pct Recovery = 105%  Expected Conc. = 4.984 
 Median Pct Recovery = 105%  Expected Conc. = 1.18 
 Median Pct Recovery = 105%  Expected Conc. = 1.18 
 Median Pct Recovery = 105%  Expected Conc. = 1.18 
 Median Pct Recovery = 105%  Expected Conc. = 1.18 
 Median Pct Recovery = 105%  Expected Conc. = 0.9968 
 Median Pct Recovery = 105%  Expected Conc. = 0.9968 
 Median Pct Recovery = 105%  Expected Conc. = 0.9968 
 Median Pct Recovery = 105%  Expected Conc. = 0.9968 
 Median Pct Recovery = 105%  Expected Conc. = 0.9968 
 Median Pct Recovery = 105%  Expected Conc. = 0.9968 
 Median Pct Recovery = 105%  Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.36 
 Median Pct Recovery = 105%  Expected Conc. = 0.36 
 Median Pct Recovery = 105%  Expected Conc. = 0.36 
 Median Pct Recovery = 105%  Expected Conc. = 0.36 
 Median Pct Recovery = 105%  Expected Conc. = 0.36 
 Median Pct Recovery = 105%  Expected Conc. = 0.36 
 Median Pct Recovery = 105%  Expected Conc. = 0.216 
 Median Pct Recovery = 105%  Expected Conc. = 0.216 
 Median Pct Recovery = 105%  Expected Conc. = 0.216 
 Median Pct Recovery = 105%  Expected Conc. = 0.216 
 Median Pct Recovery = 105%  Expected Conc. = 0.216 
 Median Pct Recovery = 105%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 107%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 105%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 115%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 101%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 108%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 98%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 103%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 104%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 118%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 103%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 100%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 90%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 108%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 98%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 106%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 96%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 104%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 109%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 124%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 110%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
METHYL ACRYLATE
METHOD: 4054 , TESTIDCODE: 49991GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 15 
 Median Pct Recovery = 107%  Expected Conc. = 15 
 Median Pct Recovery = 107%  Expected Conc. = 15 
 Median Pct Recovery = 107%  Expected Conc. = 4.4 
 Median Pct Recovery = 107%  Expected Conc. = 4.4 
 Median Pct Recovery = 107%  Expected Conc. = 4.4 
 Median Pct Recovery = 107%  Expected Conc. = 4.4 
 Median Pct Recovery = 107%  Expected Conc. = 4.4 
 Median Pct Recovery = 107%  Expected Conc. = 4.4 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 3.196 
 Median Pct Recovery = 107%  Expected Conc. = 1.296 
 Median Pct Recovery = 107%  Expected Conc. = 1.296 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 3.24 
 Median Pct Recovery = 107%  Expected Conc. = 1.296 
 Median Pct Recovery = 107%  Expected Conc. = 1.296 
 Median Pct Recovery = 107%  Expected Conc. = 1.296 
 Median Pct Recovery = 107%  Expected Conc. = 1.296 
 Median Pct Recovery = 107%  Expected Conc. = 0.204 
 Median Pct Recovery = 107%  Expected Conc. = 0.204 
 Median Pct Recovery = 107%  Expected Conc. = 0.204 
 Median Pct Recovery = 107%  Expected Conc. = 0.204 
 Median Pct Recovery = 107%  Expected Conc. = 0.204 
 Median Pct Recovery = 107%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 114%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 104%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 106%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 103%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 115%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 96%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 108%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 107%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 114%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 95%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 96%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 109%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 108%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 89%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2,3,4-TETRAMETHYLBENZENE
METHOD: 4054 , TESTIDCODE: 49999GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 3.208 
 Median Pct Recovery = 108%  Expected Conc. = 3.208 
 Median Pct Recovery = 108%  Expected Conc. = 3.208 
 Median Pct Recovery = 108%  Expected Conc. = 3.208 
 Median Pct Recovery = 108%  Expected Conc. = 3.208 
 Median Pct Recovery = 108%  Expected Conc. = 2.3 
 Median Pct Recovery = 108%  Expected Conc. = 2.3 
 Median Pct Recovery = 108%  Expected Conc. = 2.3 
 Median Pct Recovery = 108%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 78%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 108%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 106%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 147%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 114%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2,3,5-TETRAMETHYLBENZENE
METHOD: 4054 , TESTIDCODE: 50000GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 4.04 
 Median Pct Recovery = 111%  Expected Conc. = 3.948 
 Median Pct Recovery = 111%  Expected Conc. = 3.948 
 Median Pct Recovery = 111%  Expected Conc. = 3.948 
 Median Pct Recovery = 111%  Expected Conc. = 3.948 
 Median Pct Recovery = 111%  Expected Conc. = 3.948 
 Median Pct Recovery = 111%  Expected Conc. = 3.948 
 Median Pct Recovery = 111%  Expected Conc. = 2.4 
 Median Pct Recovery = 111%  Expected Conc. = 2.4 
 Median Pct Recovery = 111%  Expected Conc. = 2.4 
 Median Pct Recovery = 111%  Expected Conc. = 2.4 
 Median Pct Recovery = 111%  Expected Conc. = 1.616 
 Median Pct Recovery = 111%  Expected Conc. = 1.616 
 Median Pct Recovery = 111%  Expected Conc. = 1.616 
 Median Pct Recovery = 111%  Expected Conc. = 1.616 
 Median Pct Recovery = 111%  Expected Conc. = 1.616 
 Median Pct Recovery = 111%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 119%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 141%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 114%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 118%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 84%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 95%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 88%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 113%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 118%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 95%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 110%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 105%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 124%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Median Pct Recovery = 111%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
ETHYL TERT-BUTYL ETHER
METHOD: 4054 , TESTIDCODE: 50004GCM66
DATES: 08/16/00 - 07/09/03

 Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 4 
 Median Pct Recovery = 110%  Expected Conc. = 1.6 
 Median Pct Recovery = 110%  Expected Conc. = 1.6 
 Median Pct Recovery = 110%  Expected Conc. = 1.6 
 Median Pct Recovery = 110%  Expected Conc. = 1.6 
 Median Pct Recovery = 110%  Expected Conc. = 1.6 
 Median Pct Recovery = 110%  Expected Conc. = 1.6 
 Median Pct Recovery = 110%  Expected Conc. = 0.5 
 Median Pct Recovery = 110%  Expected Conc. = 0.5 
 Median Pct Recovery = 110%  Expected Conc. = 0.5 
 Median Pct Recovery = 110%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 111%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 120%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 110%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 119%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 95%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 103%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 91%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 114%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 104%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 111%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 91%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Median Pct Recovery = 110%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TRANS-1,4-DICHLORO-2-BUTENE
METHOD: 4054 , TESTIDCODE: 73547GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 7 
 Median Pct Recovery = 109%  Expected Conc. = 7 
 Median Pct Recovery = 109%  Expected Conc. = 7 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.8 
 Median Pct Recovery = 109%  Expected Conc. = 4.08 
 Median Pct Recovery = 109%  Expected Conc. = 4.08 
 Median Pct Recovery = 109%  Expected Conc. = 4.08 
 Median Pct Recovery = 109%  Expected Conc. = 4.08 
 Median Pct Recovery = 109%  Expected Conc. = 4.08 
 Median Pct Recovery = 109%  Expected Conc. = 4.08 
 Median Pct Recovery = 109%  Expected Conc. = 4.04 
 Median Pct Recovery = 109%  Expected Conc. = 4.04 
 Median Pct Recovery = 109%  Expected Conc. = 4.04 
 Median Pct Recovery = 109%  Expected Conc. = 4.04 
 Median Pct Recovery = 109%  Expected Conc. = 4.04 
 Median Pct Recovery = 109%  Expected Conc. = 4.04 
 Median Pct Recovery = 109%  Expected Conc. = 1.92 
 Median Pct Recovery = 109%  Expected Conc. = 1.92 
 Median Pct Recovery = 109%  Expected Conc. = 1.92 
 Median Pct Recovery = 109%  Expected Conc. = 1.92 
 Median Pct Recovery = 109%  Expected Conc. = 1.92 
 Median Pct Recovery = 109%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 120%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 93%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 99%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 116%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 98%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 109%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 93%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 108%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 113%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 117%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 109%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 103%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 122%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 128%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 117%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 107%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Median Pct Recovery = 109%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
ETHYL METHACRYLATE
METHOD: 4054 , TESTIDCODE: 73570GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 4.96 
 Median Pct Recovery = 101%  Expected Conc. = 4.96 
 Median Pct Recovery = 101%  Expected Conc. = 4.96 
 Median Pct Recovery = 101%  Expected Conc. = 4.96 
 Median Pct Recovery = 101%  Expected Conc. = 4.96 
 Median Pct Recovery = 101%  Expected Conc. = 4.004 
 Median Pct Recovery = 101%  Expected Conc. = 4.004 
 Median Pct Recovery = 101%  Expected Conc. = 4.004 
 Median Pct Recovery = 101%  Expected Conc. = 4.004 
 Median Pct Recovery = 101%  Expected Conc. = 4.004 
 Median Pct Recovery = 101%  Expected Conc. = 4.004 
 Median Pct Recovery = 101%  Expected Conc. = 2.8 
 Median Pct Recovery = 101%  Expected Conc. = 2.8 
 Median Pct Recovery = 101%  Expected Conc. = 2.8 
 Median Pct Recovery = 101%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 99%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 101%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 121%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 100%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 105%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 112%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 94%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
CARBON DISULFIDE
METHOD: 4054 , TESTIDCODE: 77041GCM66
DATES: 08/16/00 - 07/31/01

 Expected Conc. = 6.8 
 Median Pct Recovery = 106%  Expected Conc. = 6.8 
 Median Pct Recovery = 106%  Expected Conc. = 6.8 
 Median Pct Recovery = 106%  Expected Conc. = 6.8 
 Median Pct Recovery = 106%  Expected Conc. = 6.8 
 Median Pct Recovery = 106%  Expected Conc. = 0.8 
 Median Pct Recovery = 106%  Expected Conc. = 0.8 
 Median Pct Recovery = 106%  Expected Conc. = 0.8 
 Median Pct Recovery = 106%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 118%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 106%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 106%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
CIS-1,2-DICHLOROETHYLENE
METHOD: 4054 , TESTIDCODE: 77093GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 102%  Expected Conc. = 0.5 
 Median Pct Recovery = 102%  Expected Conc. = 0.5 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.272 
 Median Pct Recovery = 102%  Expected Conc. = 0.228 
 Median Pct Recovery = 102%  Expected Conc. = 0.228 
 Median Pct Recovery = 102%  Expected Conc. = 0.228 
 Median Pct Recovery = 102%  Expected Conc. = 0.228 
 Median Pct Recovery = 102%  Expected Conc. = 0.228 
 Median Pct Recovery = 102%  Expected Conc. = 0.228 
 Median Pct Recovery = 102%  Expected Conc. = 0.0092 
 Median Pct Recovery = 102%  Expected Conc. = 0.0092 
 Median Pct Recovery = 102%  Expected Conc. = 0.0092 
 Median Pct Recovery = 102%  Expected Conc. = 0.0092 
 Median Pct Recovery = 102%  Expected Conc. = 0.0092 
 Median Pct Recovery = 102%  Expected Conc. = 0.0092 
 Median Pct Recovery = 102%  Expected Conc. = 0.0018 
 Median Pct Recovery = 102%  Expected Conc. = 0.0018 
 Median Pct Recovery = 102%  Expected Conc. = 0.0018 
 Median Pct Recovery = 102%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 114%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 102%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 96%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 105%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 105%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 100%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 97%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 101%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
2-HEXANONE
METHOD: 4054 , TESTIDCODE: 77103GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 7.5 
 Median Pct Recovery = 102%  Expected Conc. = 7.5 
 Median Pct Recovery = 102%  Expected Conc. = 7.5 
 Median Pct Recovery = 102%  Expected Conc. = 5.12 
 Median Pct Recovery = 102%  Expected Conc. = 5.12 
 Median Pct Recovery = 102%  Expected Conc. = 5.12 
 Median Pct Recovery = 102%  Expected Conc. = 5.12 
 Median Pct Recovery = 102%  Expected Conc. = 5.12 
 Median Pct Recovery = 102%  Expected Conc. = 5.12 
 Median Pct Recovery = 102%  Expected Conc. = 4 
 Median Pct Recovery = 102%  Expected Conc. = 4 
 Median Pct Recovery = 102%  Expected Conc. = 4 
 Median Pct Recovery = 102%  Expected Conc. = 4 
 Median Pct Recovery = 102%  Expected Conc. = 4 
 Median Pct Recovery = 102%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 93%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 113%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 102%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 127%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 97%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 101%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 103%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Median Pct Recovery = 102%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
STYRENE
METHOD: 4054 , TESTIDCODE: 77128GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 5.216 
 Median Pct Recovery = 101%  Expected Conc. = 5.216 
 Median Pct Recovery = 101%  Expected Conc. = 5.216 
 Median Pct Recovery = 101%  Expected Conc. = 5.216 
 Median Pct Recovery = 101%  Expected Conc. = 4.735 
 Median Pct Recovery = 101%  Expected Conc. = 4.735 
 Median Pct Recovery = 101%  Expected Conc. = 4.735 
 Median Pct Recovery = 101%  Expected Conc. = 4.735 
 Median Pct Recovery = 101%  Expected Conc. = 4.735 
 Median Pct Recovery = 101%  Expected Conc. = 4.735 
 Median Pct Recovery = 101%  Expected Conc. = 1.0432 
 Median Pct Recovery = 101%  Expected Conc. = 1.0432 
 Median Pct Recovery = 101%  Expected Conc. = 1.0432 
 Median Pct Recovery = 101%  Expected Conc. = 1.0432 
 Median Pct Recovery = 101%  Expected Conc. = 1.0432 
 Median Pct Recovery = 101%  Expected Conc. = 1.0432 
 Median Pct Recovery = 101%  Expected Conc. = 0.947 
 Median Pct Recovery = 101%  Expected Conc. = 0.947 
 Median Pct Recovery = 101%  Expected Conc. = 0.947 
 Median Pct Recovery = 101%  Expected Conc. = 0.947 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.21 
 Median Pct Recovery = 101%  Expected Conc. = 0.21 
 Median Pct Recovery = 101%  Expected Conc. = 0.21 
 Median Pct Recovery = 101%  Expected Conc. = 0.21 
 Median Pct Recovery = 101%  Expected Conc. = 0.21 
 Median Pct Recovery = 101%  Expected Conc. = 0.21 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 101%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 127%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 97%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 107%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 97%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 94%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 89%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 98%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 108%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 98%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 139%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 91%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 101%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 104%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 97%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 100%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 112%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 103%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
O-XYLENE
METHOD: 4054 , TESTIDCODE: 77135GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 7.62 
 Median Pct Recovery = 97%  Expected Conc. = 7.62 
 Median Pct Recovery = 97%  Expected Conc. = 7.62 
 Median Pct Recovery = 97%  Expected Conc. = 7.62 
 Median Pct Recovery = 97%  Expected Conc. = 7.62 
 Median Pct Recovery = 97%  Expected Conc. = 5.176 
 Median Pct Recovery = 97%  Expected Conc. = 5.176 
 Median Pct Recovery = 97%  Expected Conc. = 5.176 
 Median Pct Recovery = 97%  Expected Conc. = 5.176 
 Median Pct Recovery = 97%  Expected Conc. = 4.31 
 Median Pct Recovery = 97%  Expected Conc. = 4.31 
 Median Pct Recovery = 97%  Expected Conc. = 4.31 
 Median Pct Recovery = 97%  Expected Conc. = 4.31 
 Median Pct Recovery = 97%  Expected Conc. = 4.31 
 Median Pct Recovery = 97%  Expected Conc. = 4.31 
 Median Pct Recovery = 97%  Expected Conc. = 1.0352 
 Median Pct Recovery = 97%  Expected Conc. = 1.0352 
 Median Pct Recovery = 97%  Expected Conc. = 1.0352 
 Median Pct Recovery = 97%  Expected Conc. = 1.0352 
 Median Pct Recovery = 97%  Expected Conc. = 1.0352 
 Median Pct Recovery = 97%  Expected Conc. = 1.0352 
 Median Pct Recovery = 97%  Expected Conc. = 0.862 
 Median Pct Recovery = 97%  Expected Conc. = 0.862 
 Median Pct Recovery = 97%  Expected Conc. = 0.862 
 Median Pct Recovery = 97%  Expected Conc. = 0.862 
 Median Pct Recovery = 97%  Expected Conc. = 0.6 
 Median Pct Recovery = 97%  Expected Conc. = 0.6 
 Median Pct Recovery = 97%  Expected Conc. = 0.6 
 Median Pct Recovery = 97%  Expected Conc. = 0.6 
 Median Pct Recovery = 97%  Expected Conc. = 0.348 
 Median Pct Recovery = 97%  Expected Conc. = 0.348 
 Median Pct Recovery = 97%  Expected Conc. = 0.348 
 Median Pct Recovery = 97%  Expected Conc. = 0.348 
 Median Pct Recovery = 97%  Expected Conc. = 0.348 
 Median Pct Recovery = 97%  Expected Conc. = 0.348 
 Median Pct Recovery = 97%  Expected Conc. = 0.28 
 Median Pct Recovery = 97%  Expected Conc. = 0.28 
 Median Pct Recovery = 97%  Expected Conc. = 0.28 
 Median Pct Recovery = 97%  Expected Conc. = 0.28 
 Median Pct Recovery = 97%  Expected Conc. = 0.28 
 Median Pct Recovery = 97%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 97%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 118%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 88%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 111%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 95%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 96%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 86%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 97%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 103%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 93%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 126%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 90%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 97%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 92%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 97%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 102%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 102%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 98%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 99%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 108%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,1-DICHLOROPROPENE
METHOD: 4054 , TESTIDCODE: 77168GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 120%  Expected Conc. = 0.5 
 Median Pct Recovery = 120%  Expected Conc. = 0.5 
 Median Pct Recovery = 120%  Expected Conc. = 0.312 
 Median Pct Recovery = 120%  Expected Conc. = 0.312 
 Median Pct Recovery = 120%  Expected Conc. = 0.312 
 Median Pct Recovery = 120%  Expected Conc. = 0.312 
 Median Pct Recovery = 120%  Expected Conc. = 0.312 
 Median Pct Recovery = 120%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 124%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 93%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 110%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 126%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Median Pct Recovery = 120%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
2,2-DICHLOROPROPANE
METHOD: 4054 , TESTIDCODE: 77170GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.8 
 Median Pct Recovery = 98%  Expected Conc. = 0.8 
 Median Pct Recovery = 98%  Expected Conc. = 0.8 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 82%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 95%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 103%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,3-DICHLOROPROPANE
METHOD: 4054 , TESTIDCODE: 77173GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.872 
 Median Pct Recovery = 106%  Expected Conc. = 6.872 
 Median Pct Recovery = 106%  Expected Conc. = 6.872 
 Median Pct Recovery = 106%  Expected Conc. = 6.6 
 Median Pct Recovery = 106%  Expected Conc. = 6.6 
 Median Pct Recovery = 106%  Expected Conc. = 6.6 
 Median Pct Recovery = 106%  Expected Conc. = 6.6 
 Median Pct Recovery = 106%  Expected Conc. = 6.6 
 Median Pct Recovery = 106%  Expected Conc. = 6.6 
 Median Pct Recovery = 106%  Expected Conc. = 5.6 
 Median Pct Recovery = 106%  Expected Conc. = 5.6 
 Median Pct Recovery = 106%  Expected Conc. = 5.6 
 Median Pct Recovery = 106%  Expected Conc. = 5.6 
 Median Pct Recovery = 106%  Expected Conc. = 5.6 
 Median Pct Recovery = 106%  Expected Conc. = 5.6 
 Median Pct Recovery = 106%  Expected Conc. = 1.3744 
 Median Pct Recovery = 106%  Expected Conc. = 1.3744 
 Median Pct Recovery = 106%  Expected Conc. = 1.3744 
 Median Pct Recovery = 106%  Expected Conc. = 1.3744 
 Median Pct Recovery = 106%  Expected Conc. = 1.3744 
 Median Pct Recovery = 106%  Expected Conc. = 1.3744 
 Median Pct Recovery = 106%  Expected Conc. = 1.2 
 Median Pct Recovery = 106%  Expected Conc. = 1.2 
 Median Pct Recovery = 106%  Expected Conc. = 1.2 
 Median Pct Recovery = 106%  Expected Conc. = 1.2 
 Median Pct Recovery = 106%  Expected Conc. = 1.12 
 Median Pct Recovery = 106%  Expected Conc. = 1.12 
 Median Pct Recovery = 106%  Expected Conc. = 1.12 
 Median Pct Recovery = 106%  Expected Conc. = 1.12 
 Median Pct Recovery = 106%  Expected Conc. = 0.312 
 Median Pct Recovery = 106%  Expected Conc. = 0.312 
 Median Pct Recovery = 106%  Expected Conc. = 0.312 
 Median Pct Recovery = 106%  Expected Conc. = 0.312 
 Median Pct Recovery = 106%  Expected Conc. = 0.312 
 Median Pct Recovery = 106%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 104%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 97%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 109%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 110%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 100%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 97%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 106%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 107%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 103%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 101%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 103%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 113%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 109%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 109%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 109%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 111%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
O-ETHYL TOLUENE
METHOD: 4054 , TESTIDCODE: 77220GCM66
DATES: 08/16/00 - 07/09/03

 Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 4.4 
 Median Pct Recovery = 105%  Expected Conc. = 1.76 
 Median Pct Recovery = 105%  Expected Conc. = 1.76 
 Median Pct Recovery = 105%  Expected Conc. = 1.76 
 Median Pct Recovery = 105%  Expected Conc. = 1.76 
 Median Pct Recovery = 105%  Expected Conc. = 1.76 
 Median Pct Recovery = 105%  Expected Conc. = 1.76 
 Median Pct Recovery = 105%  Expected Conc. = 1 
 Median Pct Recovery = 105%  Expected Conc. = 1 
 Median Pct Recovery = 105%  Expected Conc. = 1 
 Median Pct Recovery = 105%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 112%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 107%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 93%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 90%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 110%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 91%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 100%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 105%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 109%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 105%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 97%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2,3-TRIMETHYLBENZENE
METHOD: 4054 , TESTIDCODE: 77221GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 3.992 
 Median Pct Recovery = 106%  Expected Conc. = 3.992 
 Median Pct Recovery = 106%  Expected Conc. = 3.992 
 Median Pct Recovery = 106%  Expected Conc. = 3.992 
 Median Pct Recovery = 106%  Expected Conc. = 3.992 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 3.4 
 Median Pct Recovery = 106%  Expected Conc. = 1.36 
 Median Pct Recovery = 106%  Expected Conc. = 1.36 
 Median Pct Recovery = 106%  Expected Conc. = 1.36 
 Median Pct Recovery = 106%  Expected Conc. = 1.36 
 Median Pct Recovery = 106%  Expected Conc. = 1.36 
 Median Pct Recovery = 106%  Expected Conc. = 1.36 
 Median Pct Recovery = 106%  Expected Conc. = 1.2 
 Median Pct Recovery = 106%  Expected Conc. = 1.2 
 Median Pct Recovery = 106%  Expected Conc. = 1.2 
 Median Pct Recovery = 106%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 90%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 100%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 97%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 116%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 119%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 102%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 91%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 109%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 100%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 107%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 107%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 119%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 105%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Median Pct Recovery = 106%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2,4-TRIMETHYLBENZENE
METHOD: 4054 , TESTIDCODE: 77222GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.6 
 Median Pct Recovery = 99%  Expected Conc. = 0.6 
 Median Pct Recovery = 99%  Expected Conc. = 0.6 
 Median Pct Recovery = 99%  Expected Conc. = 0.16 
 Median Pct Recovery = 99%  Expected Conc. = 0.16 
 Median Pct Recovery = 99%  Expected Conc. = 0.16 
 Median Pct Recovery = 99%  Expected Conc. = 0.16 
 Median Pct Recovery = 99%  Expected Conc. = 0.16 
 Median Pct Recovery = 99%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 98%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 99%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 94%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 103%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 101%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
ISOPROPYLBENZENE (CUMENE)
METHOD: 4054 , TESTIDCODE: 77223GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.27 
 Median Pct Recovery = 105%  Expected Conc. = 0.27 
 Median Pct Recovery = 105%  Expected Conc. = 0.27 
 Median Pct Recovery = 105%  Expected Conc. = 0.27 
 Median Pct Recovery = 105%  Expected Conc. = 0.27 
 Median Pct Recovery = 105%  Expected Conc. = 0.27 
 Median Pct Recovery = 105%  Expected Conc. = 0.0167 
 Median Pct Recovery = 105%  Expected Conc. = 0.0167 
 Median Pct Recovery = 105%  Expected Conc. = 0.0167 
 Median Pct Recovery = 105%  Expected Conc. = 0.0167 
 Median Pct Recovery = 105%  Expected Conc. = 0.0167 
 Median Pct Recovery = 105%  Expected Conc. = 0.0167 
 Median Pct Recovery = 105%  Expected Conc. = 0.0033 
 Median Pct Recovery = 105%  Expected Conc. = 0.0033 
 Median Pct Recovery = 105%  Expected Conc. = 0.0033 
 Median Pct Recovery = 105%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 88%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 112%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 103%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 100%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 103%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 107%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 106%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
N-PROPYLBENZENE
METHOD: 4054 , TESTIDCODE: 77224GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 104%  Expected Conc. = 0.5 
 Median Pct Recovery = 104%  Expected Conc. = 0.5 
 Median Pct Recovery = 104%  Expected Conc. = 0.312 
 Median Pct Recovery = 104%  Expected Conc. = 0.312 
 Median Pct Recovery = 104%  Expected Conc. = 0.312 
 Median Pct Recovery = 104%  Expected Conc. = 0.312 
 Median Pct Recovery = 104%  Expected Conc. = 0.312 
 Median Pct Recovery = 104%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 102%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 113%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,3,5-TRIMETHYLBENZENE
METHOD: 4054 , TESTIDCODE: 77226GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.5 
 Median Pct Recovery = 100%  Expected Conc. = 0.312 
 Median Pct Recovery = 100%  Expected Conc. = 0.312 
 Median Pct Recovery = 100%  Expected Conc. = 0.312 
 Median Pct Recovery = 100%  Expected Conc. = 0.312 
 Median Pct Recovery = 100%  Expected Conc. = 0.312 
 Median Pct Recovery = 100%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 97%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 100%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 92%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
2-CHLOROTOLUENE
METHOD: 4054 , TESTIDCODE: 77275GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.928 
 Median Pct Recovery = 101%  Expected Conc. = 6.928 
 Median Pct Recovery = 101%  Expected Conc. = 6.928 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 6.48 
 Median Pct Recovery = 101%  Expected Conc. = 5.15 
 Median Pct Recovery = 101%  Expected Conc. = 5.15 
 Median Pct Recovery = 101%  Expected Conc. = 5.15 
 Median Pct Recovery = 101%  Expected Conc. = 5.15 
 Median Pct Recovery = 101%  Expected Conc. = 5.15 
 Median Pct Recovery = 101%  Expected Conc. = 5.15 
 Median Pct Recovery = 101%  Expected Conc. = 1.3856 
 Median Pct Recovery = 101%  Expected Conc. = 1.3856 
 Median Pct Recovery = 101%  Expected Conc. = 1.3856 
 Median Pct Recovery = 101%  Expected Conc. = 1.3856 
 Median Pct Recovery = 101%  Expected Conc. = 1.3856 
 Median Pct Recovery = 101%  Expected Conc. = 1.3856 
 Median Pct Recovery = 101%  Expected Conc. = 1.03 
 Median Pct Recovery = 101%  Expected Conc. = 1.03 
 Median Pct Recovery = 101%  Expected Conc. = 1.03 
 Median Pct Recovery = 101%  Expected Conc. = 1.03 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.36 
 Median Pct Recovery = 101%  Expected Conc. = 0.36 
 Median Pct Recovery = 101%  Expected Conc. = 0.36 
 Median Pct Recovery = 101%  Expected Conc. = 0.36 
 Median Pct Recovery = 101%  Expected Conc. = 0.36 
 Median Pct Recovery = 101%  Expected Conc. = 0.36 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 108%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 98%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 110%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 126%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 94%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 104%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 99%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 106%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 98%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 97%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 107%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 98%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 111%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 100%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 87%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 101%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 101%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 96%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 105%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
4-CHLOROTOLUENE
METHOD: 4054 , TESTIDCODE: 77277GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.466 
 Median Pct Recovery = 100%  Expected Conc. = 5.466 
 Median Pct Recovery = 100%  Expected Conc. = 5.466 
 Median Pct Recovery = 100%  Expected Conc. = 5.466 
 Median Pct Recovery = 100%  Expected Conc. = 5.466 
 Median Pct Recovery = 100%  Expected Conc. = 5.44 
 Median Pct Recovery = 100%  Expected Conc. = 5.44 
 Median Pct Recovery = 100%  Expected Conc. = 5.44 
 Median Pct Recovery = 100%  Expected Conc. = 5.44 
 Median Pct Recovery = 100%  Expected Conc. = 4.6 
 Median Pct Recovery = 100%  Expected Conc. = 4.6 
 Median Pct Recovery = 100%  Expected Conc. = 4.6 
 Median Pct Recovery = 100%  Expected Conc. = 4.6 
 Median Pct Recovery = 100%  Expected Conc. = 4.6 
 Median Pct Recovery = 100%  Expected Conc. = 4.6 
 Median Pct Recovery = 100%  Expected Conc. = 1.088 
 Median Pct Recovery = 100%  Expected Conc. = 1.088 
 Median Pct Recovery = 100%  Expected Conc. = 1.088 
 Median Pct Recovery = 100%  Expected Conc. = 1.088 
 Median Pct Recovery = 100%  Expected Conc. = 1.088 
 Median Pct Recovery = 100%  Expected Conc. = 1.088 
 Median Pct Recovery = 100%  Expected Conc. = 0.92 
 Median Pct Recovery = 100%  Expected Conc. = 0.92 
 Median Pct Recovery = 100%  Expected Conc. = 0.92 
 Median Pct Recovery = 100%  Expected Conc. = 0.92 
 Median Pct Recovery = 100%  Expected Conc. = 0.6 
 Median Pct Recovery = 100%  Expected Conc. = 0.6 
 Median Pct Recovery = 100%  Expected Conc. = 0.6 
 Median Pct Recovery = 100%  Expected Conc. = 0.6 
 Median Pct Recovery = 100%  Expected Conc. = 0.28 
 Median Pct Recovery = 100%  Expected Conc. = 0.28 
 Median Pct Recovery = 100%  Expected Conc. = 0.28 
 Median Pct Recovery = 100%  Expected Conc. = 0.28 
 Median Pct Recovery = 100%  Expected Conc. = 0.28 
 Median Pct Recovery = 100%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 105%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 115%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 90%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 108%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 94%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 93%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 92%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 96%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 100%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 95%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 114%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 91%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 103%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 106%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 103%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 97%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Median Pct Recovery = 100%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
BROMOCHLOROMETHANE
METHOD: 4054 , TESTIDCODE: 77297GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 1 
 Median Pct Recovery = 103%  Expected Conc. = 1 
 Median Pct Recovery = 103%  Expected Conc. = 1 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 110%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 102%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 98%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
BUTYLBENZENE
METHOD: 4054 , TESTIDCODE: 77342GCM66
DATES: 02/23/00 - 10/04/03

 Expected Conc. = 4.004 
 Median Pct Recovery = 99%  Expected Conc. = 4.004 
 Median Pct Recovery = 99%  Expected Conc. = 4.004 
 Median Pct Recovery = 99%  Expected Conc. = 4.004 
 Median Pct Recovery = 99%  Expected Conc. = 4.004 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 3.84 
 Median Pct Recovery = 99%  Expected Conc. = 1.9 
 Median Pct Recovery = 99%  Expected Conc. = 1.9 
 Median Pct Recovery = 99%  Expected Conc. = 1.9 
 Median Pct Recovery = 99%  Expected Conc. = 1.9 
 Median Pct Recovery = 99%  Expected Conc. = 1.536 
 Median Pct Recovery = 99%  Expected Conc. = 1.536 
 Median Pct Recovery = 99%  Expected Conc. = 1.536 
 Median Pct Recovery = 99%  Expected Conc. = 1.536 
 Median Pct Recovery = 99%  Expected Conc. = 1.536 
 Median Pct Recovery = 99%  Expected Conc. = 1.536 
 Median Pct Recovery = 99%  Expected Conc. = 0.312 
 Median Pct Recovery = 99%  Expected Conc. = 0.312 
 Median Pct Recovery = 99%  Expected Conc. = 0.312 
 Median Pct Recovery = 99%  Expected Conc. = 0.312 
 Median Pct Recovery = 99%  Expected Conc. = 0.312 
 Median Pct Recovery = 99%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 83%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 80%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 95%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 114%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 124%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 99%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 87%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 122%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 85%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 98%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 94%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 111%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 108%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 119%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 99%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 108%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 95%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Median Pct Recovery = 99%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
SEC-BUTYLBENZENE
METHOD: 4054 , TESTIDCODE: 77350GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.5 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Expected Conc. = 0.28 
 Median Pct Recovery = 103%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 103%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 116%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 107%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TERT-BUTYLBENZENE
METHOD: 4054 , TESTIDCODE: 77353GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 1 
 Median Pct Recovery = 107%  Expected Conc. = 1 
 Median Pct Recovery = 107%  Expected Conc. = 1 
 Median Pct Recovery = 107%  Expected Conc. = 0.312 
 Median Pct Recovery = 107%  Expected Conc. = 0.312 
 Median Pct Recovery = 107%  Expected Conc. = 0.312 
 Median Pct Recovery = 107%  Expected Conc. = 0.312 
 Median Pct Recovery = 107%  Expected Conc. = 0.312 
 Median Pct Recovery = 107%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 95%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 116%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 107%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
4-ISOPROPYL-1-METHYLBENZENE (CYMENE)
METHOD: 4054 , TESTIDCODE: 77356GCM66
DATES: 02/23/00 - 07/09/03

 Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 3.8 
 Median Pct Recovery = 103%  Expected Conc. = 1.52 
 Median Pct Recovery = 103%  Expected Conc. = 1.52 
 Median Pct Recovery = 103%  Expected Conc. = 1.52 
 Median Pct Recovery = 103%  Expected Conc. = 1.52 
 Median Pct Recovery = 103%  Expected Conc. = 1.52 
 Median Pct Recovery = 103%  Expected Conc. = 1.52 
 Median Pct Recovery = 103%  Expected Conc. = 1.1 
 Median Pct Recovery = 103%  Expected Conc. = 1.1 
 Median Pct Recovery = 103%  Expected Conc. = 1.1 
 Median Pct Recovery = 103%  Expected Conc. = 1.1 
 Median Pct Recovery = 103%  Expected Conc. = 0.312 
 Median Pct Recovery = 103%  Expected Conc. = 0.312 
 Median Pct Recovery = 103%  Expected Conc. = 0.312 
 Median Pct Recovery = 103%  Expected Conc. = 0.312 
 Median Pct Recovery = 103%  Expected Conc. = 0.312 
 Median Pct Recovery = 103%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 115%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 116%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 95%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 89%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 121%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 88%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 105%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 107%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 115%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 98%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 93%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 101%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 102%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
METHYL IODIDE
METHOD: 4054 , TESTIDCODE: 77424GCM66
DATES: 08/16/00 - 07/31/01

 Expected Conc. = 7.2 
 Median Pct Recovery = 103%  Expected Conc. = 7.2 
 Median Pct Recovery = 103%  Expected Conc. = 7.2 
 Median Pct Recovery = 103%  Expected Conc. = 7.2 
 Median Pct Recovery = 103%  Expected Conc. = 7.2 
 Median Pct Recovery = 103%  Expected Conc. = 2 
 Median Pct Recovery = 103%  Expected Conc. = 2 
 Median Pct Recovery = 103%  Expected Conc. = 2 
 Median Pct Recovery = 103%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 74%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 89%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 103%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 125%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2,3-TRICHLOROPROPANE
METHOD: 4054 , TESTIDCODE: 77443GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 6.104 
 Median Pct Recovery = 96%  Expected Conc. = 6.104 
 Median Pct Recovery = 96%  Expected Conc. = 6.104 
 Median Pct Recovery = 96%  Expected Conc. = 5.676 
 Median Pct Recovery = 96%  Expected Conc. = 5.676 
 Median Pct Recovery = 96%  Expected Conc. = 5.676 
 Median Pct Recovery = 96%  Expected Conc. = 5.676 
 Median Pct Recovery = 96%  Expected Conc. = 5.676 
 Median Pct Recovery = 96%  Expected Conc. = 5.676 
 Median Pct Recovery = 96%  Expected Conc. = 4.45 
 Median Pct Recovery = 96%  Expected Conc. = 4.45 
 Median Pct Recovery = 96%  Expected Conc. = 4.45 
 Median Pct Recovery = 96%  Expected Conc. = 4.45 
 Median Pct Recovery = 96%  Expected Conc. = 4.45 
 Median Pct Recovery = 96%  Expected Conc. = 4.45 
 Median Pct Recovery = 96%  Expected Conc. = 1.7 
 Median Pct Recovery = 96%  Expected Conc. = 1.7 
 Median Pct Recovery = 96%  Expected Conc. = 1.7 
 Median Pct Recovery = 96%  Expected Conc. = 1.7 
 Median Pct Recovery = 96%  Expected Conc. = 1.2208 
 Median Pct Recovery = 96%  Expected Conc. = 1.2208 
 Median Pct Recovery = 96%  Expected Conc. = 1.2208 
 Median Pct Recovery = 96%  Expected Conc. = 1.2208 
 Median Pct Recovery = 96%  Expected Conc. = 1.2208 
 Median Pct Recovery = 96%  Expected Conc. = 1.2208 
 Median Pct Recovery = 96%  Expected Conc. = 0.89 
 Median Pct Recovery = 96%  Expected Conc. = 0.89 
 Median Pct Recovery = 96%  Expected Conc. = 0.89 
 Median Pct Recovery = 96%  Expected Conc. = 0.89 
 Median Pct Recovery = 96%  Expected Conc. = 0.24 
 Median Pct Recovery = 96%  Expected Conc. = 0.24 
 Median Pct Recovery = 96%  Expected Conc. = 0.24 
 Median Pct Recovery = 96%  Expected Conc. = 0.24 
 Median Pct Recovery = 96%  Expected Conc. = 0.24 
 Median Pct Recovery = 96%  Expected Conc. = 0.24 
 Median Pct Recovery = 96%  Expected Conc. = 0.16 
 Median Pct Recovery = 96%  Expected Conc. = 0.16 
 Median Pct Recovery = 96%  Expected Conc. = 0.16 
 Median Pct Recovery = 96%  Expected Conc. = 0.16 
 Median Pct Recovery = 96%  Expected Conc. = 0.16 
 Median Pct Recovery = 96%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 101%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 94%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 103%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 107%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 98%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 84%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 92%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 94%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 93%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 102%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 89%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 96%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 100%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 86%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 83%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 93%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 98%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Median Pct Recovery = 96%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,1,1,2-TETRACHLOROETHANE
METHOD: 4054 , TESTIDCODE: 77562GCM66
DATES: 01/11/00 - 08/25/01

 Expected Conc. = 5.76 
 Median Pct Recovery = 101%  Expected Conc. = 5.76 
 Median Pct Recovery = 101%  Expected Conc. = 5.76 
 Median Pct Recovery = 101%  Expected Conc. = 5.76 
 Median Pct Recovery = 101%  Expected Conc. = 5.76 
 Median Pct Recovery = 101%  Expected Conc. = 5.2 
 Median Pct Recovery = 101%  Expected Conc. = 5.2 
 Median Pct Recovery = 101%  Expected Conc. = 5.2 
 Median Pct Recovery = 101%  Expected Conc. = 5.2 
 Median Pct Recovery = 101%  Expected Conc. = 4.975 
 Median Pct Recovery = 101%  Expected Conc. = 4.975 
 Median Pct Recovery = 101%  Expected Conc. = 4.975 
 Median Pct Recovery = 101%  Expected Conc. = 4.975 
 Median Pct Recovery = 101%  Expected Conc. = 4.975 
 Median Pct Recovery = 101%  Expected Conc. = 4.975 
 Median Pct Recovery = 101%  Expected Conc. = 1.04 
 Median Pct Recovery = 101%  Expected Conc. = 1.04 
 Median Pct Recovery = 101%  Expected Conc. = 1.04 
 Median Pct Recovery = 101%  Expected Conc. = 1.04 
 Median Pct Recovery = 101%  Expected Conc. = 1.04 
 Median Pct Recovery = 101%  Expected Conc. = 1.04 
 Median Pct Recovery = 101%  Expected Conc. = 0.995 
 Median Pct Recovery = 101%  Expected Conc. = 0.995 
 Median Pct Recovery = 101%  Expected Conc. = 0.995 
 Median Pct Recovery = 101%  Expected Conc. = 0.995 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.312 
 Median Pct Recovery = 101%  Expected Conc. = 0.312 
 Median Pct Recovery = 101%  Expected Conc. = 0.312 
 Median Pct Recovery = 101%  Expected Conc. = 0.312 
 Median Pct Recovery = 101%  Expected Conc. = 0.312 
 Median Pct Recovery = 101%  Expected Conc. = 0.312 
 Median Pct Recovery = 101%  Expected Conc. = 0.3 
 Median Pct Recovery = 101%  Expected Conc. = 0.3 
 Median Pct Recovery = 101%  Expected Conc. = 0.3 
 Median Pct Recovery = 101%  Expected Conc. = 0.3 
 Median Pct Recovery = 101%  Expected Conc. = 0.3 
 Median Pct Recovery = 101%  Analysis Date = 08/25/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 109%  Analysis Date = 06/09/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 112%  Analysis Date = 03/14/01 
 SpikeMix = ERA 1128-00-06B: 30 µl 
 Pct Recovery = 99%  Analysis Date = 05/18/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 110%  Analysis Date = 01/20/00 
 SpikeMix = ERA 093VOC: 40 µl 
 Pct Recovery = 100%  Analysis Date = 03/23/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 94%  Analysis Date = 02/14/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 94%  Analysis Date = 01/20/00 
 SpikeMix = ERA 1210-98-04B: 25 µl 
 Pct Recovery = 100%  Analysis Date = 10/18/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 108%  Analysis Date = 04/04/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 93%  Analysis Date = 01/11/00 
 SpikeMix = ERA 093VOC: 8 µl 
 Pct Recovery = 109%  Analysis Date = 04/27/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 104%  Analysis Date = 04/04/00 
 SpikeMix = ERA 1210-98-04B: 5 µl 
 Pct Recovery = 92%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 109%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 100%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 102%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 115%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 101%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 101%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 96%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 96%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2,3-TRICHLOROBENZENE
METHOD: 4054 , TESTIDCODE: 77613GCM66
DATES: 02/23/00 - 10/04/03

 Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.4 
 Median Pct Recovery = 98%  Expected Conc. = 4.004 
 Median Pct Recovery = 98%  Expected Conc. = 4.004 
 Median Pct Recovery = 98%  Expected Conc. = 4.004 
 Median Pct Recovery = 98%  Expected Conc. = 4.004 
 Median Pct Recovery = 98%  Expected Conc. = 4.004 
 Median Pct Recovery = 98%  Expected Conc. = 4.004 
 Median Pct Recovery = 98%  Expected Conc. = 2.7 
 Median Pct Recovery = 98%  Expected Conc. = 2.7 
 Median Pct Recovery = 98%  Expected Conc. = 2.7 
 Median Pct Recovery = 98%  Expected Conc. = 2.7 
 Median Pct Recovery = 98%  Expected Conc. = 1.76 
 Median Pct Recovery = 98%  Expected Conc. = 1.76 
 Median Pct Recovery = 98%  Expected Conc. = 1.76 
 Median Pct Recovery = 98%  Expected Conc. = 1.76 
 Median Pct Recovery = 98%  Expected Conc. = 1.76 
 Median Pct Recovery = 98%  Expected Conc. = 1.76 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Expected Conc. = 0.28 
 Median Pct Recovery = 98%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 110%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 119%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 99%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 92%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 85%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 93%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 73%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 103%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 77%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 104%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 110%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 98%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 78%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 109%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 78%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 146%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 84%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2-DIBROMOETHANE
METHOD: 4054 , TESTIDCODE: 77651GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.5 
 Median Pct Recovery = 101%  Expected Conc. = 0.27 
 Median Pct Recovery = 101%  Expected Conc. = 0.27 
 Median Pct Recovery = 101%  Expected Conc. = 0.27 
 Median Pct Recovery = 101%  Expected Conc. = 0.27 
 Median Pct Recovery = 101%  Expected Conc. = 0.27 
 Median Pct Recovery = 101%  Expected Conc. = 0.27 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Expected Conc. = 0.16 
 Median Pct Recovery = 101%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Analysis Date = 10/04/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 92%  Analysis Date = 07/25/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 87%  Analysis Date = 03/23/00 
 SpikeMix = Restek 57150: 30 µl 
 Pct Recovery = 93%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 104%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 119%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 105%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,1,2-TRICHLOROTRIFLUOROETHANE
METHOD: 4054 , TESTIDCODE: 77652GCM66
DATES: 08/16/00 - 07/09/03

 Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 3.6 
 Median Pct Recovery = 108%  Expected Conc. = 1.44 
 Median Pct Recovery = 108%  Expected Conc. = 1.44 
 Median Pct Recovery = 108%  Expected Conc. = 1.44 
 Median Pct Recovery = 108%  Expected Conc. = 1.44 
 Median Pct Recovery = 108%  Expected Conc. = 1.44 
 Median Pct Recovery = 108%  Expected Conc. = 1.44 
 Median Pct Recovery = 108%  Expected Conc. = 0.5 
 Median Pct Recovery = 108%  Expected Conc. = 0.5 
 Median Pct Recovery = 108%  Expected Conc. = 0.5 
 Median Pct Recovery = 108%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 115%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 133%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 124%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 103%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 108%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 90%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 104%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 110%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 119%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 104%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 94%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Median Pct Recovery = 108%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
TERT-BUTYL METHYL ETHER (MTBE)
METHOD: 4054 , TESTIDCODE: 78032GCM66
DATES: 02/23/00 - 07/31/01

 Expected Conc. = 5.2 
 Median Pct Recovery = 104%  Expected Conc. = 5.2 
 Median Pct Recovery = 104%  Expected Conc. = 5.2 
 Median Pct Recovery = 104%  Expected Conc. = 5.2 
 Median Pct Recovery = 104%  Expected Conc. = 5.2 
 Median Pct Recovery = 104%  Expected Conc. = 2 
 Median Pct Recovery = 104%  Expected Conc. = 2 
 Median Pct Recovery = 104%  Expected Conc. = 2 
 Median Pct Recovery = 104%  Expected Conc. = 2 
 Median Pct Recovery = 104%  Expected Conc. = 0.24 
 Median Pct Recovery = 104%  Expected Conc. = 0.24 
 Median Pct Recovery = 104%  Expected Conc. = 0.24 
 Median Pct Recovery = 104%  Expected Conc. = 0.24 
 Median Pct Recovery = 104%  Expected Conc. = 0.24 
 Median Pct Recovery = 104%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 103%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 104%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 124%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 107%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 93%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 92%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 106%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 103%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Median Pct Recovery = 104%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
3-CHLOROPROPENE
METHOD: 4054 , TESTIDCODE: 78109GCM66
DATES: 08/16/00 - 07/31/01

 Expected Conc. = 4.32 
 Median Pct Recovery = 107%  Expected Conc. = 4.32 
 Median Pct Recovery = 107%  Expected Conc. = 4.32 
 Median Pct Recovery = 107%  Expected Conc. = 4.32 
 Median Pct Recovery = 107%  Expected Conc. = 4.32 
 Median Pct Recovery = 107%  Expected Conc. = 0.9 
 Median Pct Recovery = 107%  Expected Conc. = 0.9 
 Median Pct Recovery = 107%  Expected Conc. = 0.9 
 Median Pct Recovery = 107%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 112%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 107%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 78%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 107%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 99%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Median Pct Recovery = 107%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
4-METHYL-2-PENTANONE
METHOD: 4054 , TESTIDCODE: 78133GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 5.04 
 Median Pct Recovery = 98%  Expected Conc. = 5.04 
 Median Pct Recovery = 98%  Expected Conc. = 5.04 
 Median Pct Recovery = 98%  Expected Conc. = 5.04 
 Median Pct Recovery = 98%  Expected Conc. = 5.04 
 Median Pct Recovery = 98%  Expected Conc. = 4.776 
 Median Pct Recovery = 98%  Expected Conc. = 4.776 
 Median Pct Recovery = 98%  Expected Conc. = 4.776 
 Median Pct Recovery = 98%  Expected Conc. = 4.776 
 Median Pct Recovery = 98%  Expected Conc. = 4.776 
 Median Pct Recovery = 98%  Expected Conc. = 4.776 
 Median Pct Recovery = 98%  Expected Conc. = 3.7 
 Median Pct Recovery = 98%  Expected Conc. = 3.7 
 Median Pct Recovery = 98%  Expected Conc. = 3.7 
 Median Pct Recovery = 98%  Expected Conc. = 3.7 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 3.32 
 Median Pct Recovery = 98%  Expected Conc. = 1.328 
 Median Pct Recovery = 98%  Expected Conc. = 1.328 
 Median Pct Recovery = 98%  Expected Conc. = 1.328 
 Median Pct Recovery = 98%  Expected Conc. = 1.328 
 Median Pct Recovery = 98%  Expected Conc. = 1.328 
 Median Pct Recovery = 98%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 116%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 97%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 128%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 92%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 101%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 104%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 92%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 81%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 90%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 110%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 102%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 109%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 70%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 98%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 84%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 88%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 100%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Median Pct Recovery = 98%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
ACETONE
METHOD: 4054 , TESTIDCODE: 81552GCM66
DATES: 08/16/00 - 07/31/01

 Expected Conc. = 60 
 Median Pct Recovery = 136%  Expected Conc. = 60 
 Median Pct Recovery = 136%  Expected Conc. = 60 
 Median Pct Recovery = 136%  Expected Conc. = 4.88 
 Median Pct Recovery = 136%  Expected Conc. = 4.88 
 Median Pct Recovery = 136%  Expected Conc. = 4.88 
 Median Pct Recovery = 136%  Expected Conc. = 4.88 
 Median Pct Recovery = 136%  Expected Conc. = 4.88 
 Median Pct Recovery = 136%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 110%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 108%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 136%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 145%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 192%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Median Pct Recovery = 136%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
BROMOBENZENE
METHOD: 4054 , TESTIDCODE: 81555GCM66
DATES: 02/23/00 - 11/15/00

 Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.5 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Expected Conc. = 0.28 
 Median Pct Recovery = 105%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 109%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 103%  Analysis Date = 06/15/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 106%  Analysis Date = 04/27/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 105%  Analysis Date = 02/23/00 
 SpikeMix = NSI 121699: 20 µl 
 Pct Recovery = 100%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
DIETHYL ETHER
METHOD: 4054 , TESTIDCODE: 81576GCM66
DATES: 08/16/00 - 07/31/01

 Expected Conc. = 5.92 
 Median Pct Recovery = 105%  Expected Conc. = 5.92 
 Median Pct Recovery = 105%  Expected Conc. = 5.92 
 Median Pct Recovery = 105%  Expected Conc. = 5.92 
 Median Pct Recovery = 105%  Expected Conc. = 5.92 
 Median Pct Recovery = 105%  Expected Conc. = 1.7 
 Median Pct Recovery = 105%  Expected Conc. = 1.7 
 Median Pct Recovery = 105%  Expected Conc. = 1.7 
 Median Pct Recovery = 105%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 108%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 105%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 122%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 96%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 99%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Median Pct Recovery = 105%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
METHYL ACRYLONITRILE
METHOD: 4054 , TESTIDCODE: 81593GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 6.48 
 Median Pct Recovery = 103%  Expected Conc. = 6.48 
 Median Pct Recovery = 103%  Expected Conc. = 6.48 
 Median Pct Recovery = 103%  Expected Conc. = 6.48 
 Median Pct Recovery = 103%  Expected Conc. = 6.48 
 Median Pct Recovery = 103%  Expected Conc. = 5.75 
 Median Pct Recovery = 103%  Expected Conc. = 5.75 
 Median Pct Recovery = 103%  Expected Conc. = 5.75 
 Median Pct Recovery = 103%  Expected Conc. = 5.75 
 Median Pct Recovery = 103%  Expected Conc. = 4.796 
 Median Pct Recovery = 103%  Expected Conc. = 4.796 
 Median Pct Recovery = 103%  Expected Conc. = 4.796 
 Median Pct Recovery = 103%  Expected Conc. = 4.796 
 Median Pct Recovery = 103%  Expected Conc. = 4.796 
 Median Pct Recovery = 103%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 108%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 102%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 128%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 95%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 95%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 105%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 102%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 104%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Median Pct Recovery = 103%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
2-BUTANONE
METHOD: 4054 , TESTIDCODE: 81595GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 16.5 
 Median Pct Recovery = 114%  Expected Conc. = 16.5 
 Median Pct Recovery = 114%  Expected Conc. = 16.5 
 Median Pct Recovery = 114%  Expected Conc. = 6.64 
 Median Pct Recovery = 114%  Expected Conc. = 6.64 
 Median Pct Recovery = 114%  Expected Conc. = 6.64 
 Median Pct Recovery = 114%  Expected Conc. = 6.64 
 Median Pct Recovery = 114%  Expected Conc. = 6.64 
 Median Pct Recovery = 114%  Expected Conc. = 6.64 
 Median Pct Recovery = 114%  Expected Conc. = 4.804 
 Median Pct Recovery = 114%  Expected Conc. = 4.804 
 Median Pct Recovery = 114%  Expected Conc. = 4.804 
 Median Pct Recovery = 114%  Expected Conc. = 4.804 
 Median Pct Recovery = 114%  Expected Conc. = 4.804 
 Median Pct Recovery = 114%  Expected Conc. = 4.804 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 3.6 
 Median Pct Recovery = 114%  Expected Conc. = 1.44 
 Median Pct Recovery = 114%  Expected Conc. = 1.44 
 Median Pct Recovery = 114%  Expected Conc. = 1.44 
 Median Pct Recovery = 114%  Expected Conc. = 1.44 
 Median Pct Recovery = 114%  Expected Conc. = 1.44 
 Median Pct Recovery = 114%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 114%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 112%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 125%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 125%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 140%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 90%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 104%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 106%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 112%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 117%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 114%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 119%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Median Pct Recovery = 114%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
METHYL METHACRYLATE
METHOD: 4054 , TESTIDCODE: 81597GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 6.16 
 Median Pct Recovery = 101%  Expected Conc. = 6.16 
 Median Pct Recovery = 101%  Expected Conc. = 6.16 
 Median Pct Recovery = 101%  Expected Conc. = 6.16 
 Median Pct Recovery = 101%  Expected Conc. = 6.16 
 Median Pct Recovery = 101%  Expected Conc. = 4.804 
 Median Pct Recovery = 101%  Expected Conc. = 4.804 
 Median Pct Recovery = 101%  Expected Conc. = 4.804 
 Median Pct Recovery = 101%  Expected Conc. = 4.804 
 Median Pct Recovery = 101%  Expected Conc. = 4.804 
 Median Pct Recovery = 101%  Expected Conc. = 4.804 
 Median Pct Recovery = 101%  Expected Conc. = 3.5 
 Median Pct Recovery = 101%  Expected Conc. = 3.5 
 Median Pct Recovery = 101%  Expected Conc. = 3.5 
 Median Pct Recovery = 101%  Analysis Date = 07/31/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 99%  Analysis Date = 04/11/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 98%  Analysis Date = 02/22/01 
 SpikeMix = Ultra S0039: 40 µl 
 Pct Recovery = 117%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 97%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 102%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 108%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 111%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Median Pct Recovery = 101%  Y = 1
The SGPlot Procedure

BQS OBSP Determination:
1,2-DIBROMO-3-CHLOROPROPANE
METHOD: 4054 , TESTIDCODE: 82625GCM66
DATES: 08/16/00 - 10/04/03

 Expected Conc. = 4.772 
 Median Pct Recovery = 97%  Expected Conc. = 4.772 
 Median Pct Recovery = 97%  Expected Conc. = 4.772 
 Median Pct Recovery = 97%  Expected Conc. = 4.772 
 Median Pct Recovery = 97%  Expected Conc. = 4.772 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 4.4 
 Median Pct Recovery = 97%  Expected Conc. = 2.1 
 Median Pct Recovery = 97%  Expected Conc. = 2.1 
 Median Pct Recovery = 97%  Expected Conc. = 2.1 
 Median Pct Recovery = 97%  Expected Conc. = 2.1 
 Median Pct Recovery = 97%  Expected Conc. = 1.76 
 Median Pct Recovery = 97%  Expected Conc. = 1.76 
 Median Pct Recovery = 97%  Expected Conc. = 1.76 
 Median Pct Recovery = 97%  Expected Conc. = 1.76 
 Median Pct Recovery = 97%  Expected Conc. = 1.76 
 Median Pct Recovery = 97%  Expected Conc. = 1.76 
 Median Pct Recovery = 97%  Expected Conc. = 0.312 
 Median Pct Recovery = 97%  Expected Conc. = 0.312 
 Median Pct Recovery = 97%  Expected Conc. = 0.312 
 Median Pct Recovery = 97%  Expected Conc. = 0.312 
 Median Pct Recovery = 97%  Expected Conc. = 0.312 
 Median Pct Recovery = 97%  Expected Conc. = 0.312 
 Median Pct Recovery = 97%  Expected Conc. = 0.21 
 Median Pct Recovery = 97%  Expected Conc. = 0.21 
 Median Pct Recovery = 97%  Expected Conc. = 0.21 
 Median Pct Recovery = 97%  Expected Conc. = 0.21 
 Median Pct Recovery = 97%  Expected Conc. = 0.21 
 Median Pct Recovery = 97%  Analysis Date = 10/04/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 87%  Analysis Date = 09/10/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 95%  Analysis Date = 08/01/03 
 SpikeMix = AccuStandard B2080329: 20 µl 
 Pct Recovery = 105%  Analysis Date = 07/09/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 102%  Analysis Date = 06/07/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 117%  Analysis Date = 05/12/03 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 98%  Analysis Date = 08/06/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 88%  Analysis Date = 05/09/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 88%  Analysis Date = 02/22/02 
 SpikeMix = Absolute 091701: 20 µl 
 Pct Recovery = 84%  Analysis Date = 11/15/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 97%  Analysis Date = 08/16/00 
 SpikeMix = NSI 053100-01: 25 µl 
 Pct Recovery = 98%  Analysis Date = 06/21/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 103%  Analysis Date = 03/16/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 80%  Analysis Date = 01/11/02 
 SpikeMix = Absolute 091701: 8 µl 
 Pct Recovery = 105%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Median Pct Recovery = 97%  Y = 1
The SGPlot Procedure