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•FRIEDMAN & BRUYA, INC. • <br /> ' ENVIRONMENTAL CHEMISTS <br /> Date of Report: 11/02/98 <br /> Date Received: 10/17/98 <br /> Project: 4780.01 <br /> QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF WATER <br /> SAMPLES FOR BENZENE, TOLUENE, ETHYLBENZENE,XYLENES AND <br /> GASOLINE USING EPA METHODS 8020A AND 8015 <br /> ' Laboratory Code: 810094-01 (Duplicate) <br /> Relative <br /> Reporting Sample Duplicate Percent Acceptance <br /> Analyte Units Result Result Difference Criteria <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 /> Ethylbenzene n/L (ppb) <0.5 <0.5 nm 0-20 <br /> ' Xylenes µg/L (ppb) <0.5 0.7 nm 0.20 <br /> Gasoline µg/L (ppb) <50 <50 nm 0-20 <br /> Laboratory Code: Laboratory Control Sample <br /> Relative <br /> Reporting Spike % Recovery %Recovery Acceptance Percent <br /> ' Analyte Units Level LCS LCSD Criteria Difference <br /> Benzene µg/L (ppb) 100 94 95 82-120 1 <br /> Toluene µg/L (ppb) 100 96 96 84-132 0 <br /> Ethylbenzene µg/L (ppb) 100 94 95 84-135 1 <br /> Xylenes µg/L (ppb) 300 95 96 87-132 1 <br /> Gasoline µg/L (ppb) 1000 117 117 80-129 0 <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 />