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FRIEDMAN & BRUYA, INC. <br /> ENVIRONMENTAL CHEMISTS <br /> Date of Report: 07/24/98 <br /> ' Date Received: 07/10/98 <br /> Project: 4780 <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: 807048-12 (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 0.5 0 0.20 <br /> Gasoline n/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 93 94 82.120 1 <br /> Toluene KIL(ppb) 100 94 95 84.132 1 <br /> Ethylbenzene n/L (ppb) 100 94 95 84.135 1 <br /> Xylenes pg/L(ppb) 300 93 95 87.132 2 <br /> Gasoline µg/L(ppb) 1000 101 103 80.129 2 <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 /> 1 <br /> 1 <br /> 1 <br /> 1 <br />