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