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FRIEDMAN & BRUYA, INC. <br /> 1 Date of Report: 09/28/99 ENVIRONMENTAL CHEMISTS <br /> Date Received: 09/24/99 <br /> Project: 5650 <br /> ' QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF WATER <br /> SAMPLES FOR VOLATILES BY EPA METHOD 8260B <br /> Laboratory Code: 909028-02 (Duplicate) <br /> Reporting Sample Duplicate Acceptance <br /> ' Analyte Units Result Result RPD Criteria <br /> Methyl t-butyl ether (MTBE) µg/L (ppb) . 3 2 40 a 0-20 <br /> Benzene µg/l, (ppb) <0.5 <0.5 nm 0-20 <br /> ' Toluene µg/L(ppb) <0.5 <0.5 nm 0-20 <br /> ' Laboratory Code: Laboratory Control Sample <br /> Reporting Spike % Recovery % Recovery Acceptance <br /> Analyte Units Level LCS LCSD Criteria RPD <br /> Methyl t-butyl ether (MTBE) µg/L (ppb) 50 130 113 65-135 14 <br /> ' Benzene 4g/L (ppb) 50 103 106 81-123 3 <br /> Toluene µg/L (ppb) 50 104 105 81-116 1 <br /> nm - The analyte was not detected in one or more of the duplicate analyses. Therefore, calculation of <br /> the RPD is not applicable. <br /> ' a - The analyte was detected at a level less than five times the detection limit. The RPD results may <br /> not provide reliable information on the variability of the analysis. <br /> ' 36 <br />