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