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r 0 FREEDMAN & BRUYA, INC. <br /> ' ENVIRONMENTAL CHEMISTS <br /> Date of Report: 09/29/98 <br /> Date Received: 09/15/98 <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: 809026.03 (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 µg/L(ppb) <0.5 <0.5 nm 0-20 <br /> Xylenes µg/L (ppb) <0.5 <0.5 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) 100 103 102 82-120 1 <br /> Toluene µg/L (ppb) 100 105 103 84-132 2 <br /> Ethylbenzene µg/L(ppb) 100 107 105 84-135 2 <br /> Xylenes µg/L(ppb) 300 106 105 87-132 1 <br /> Gasoline µg/1. (ppb) 1000 111 110 80-129 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 />