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FRIEDMAN & BRUYA, INC. <br /> ENVIRONMENTAL CHEMISTS <br /> Date of Report: 06/11/02 <br /> Date Received: 05123/02 <br /> Project: 5011.001 (Roberts Property) <br /> QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF WATER <br /> SAMPLES FOR BENZENE, TOLUENE, ETHYLBENZENE, <br /> XYLENES AND TPH AS GASOLINE <br /> USING EPA METHODS 8021E AND 8015M <br /> Laboratory Code: 205192-21 (Duplicate) <br /> Relative Percent <br /> Reporting Sample Duplicate Difference <br /> Analyte Units Result Result unit,20_ - <br /> Benzene - [.glL(ppb) <0.5 <0.5 nm <br /> Toluene µglL(ppb) X0.5 <0.5 nm <br /> Ethylbenzene µglL (ppb) <0.5 <0.5 nm <br /> Xylenes µglL(ppb) <0.5 X0.5 nm <br /> Gasoline µglL (ppb) X50 <50 nm <br /> Laboratory Code: Laboratory Control Sample <br /> Percent Percent <br /> Reporting Spike Recovery Recovery Acceptance RPD <br /> Analyte Units Level LCS LCSD Criteria (Limit 20) <br /> Gasoline µglL(ppb) 1,000 94 94 58-132 0 <br /> Laboratory Code: Laboratory Control Sample <br /> Percent Percent <br /> Reporting Spike Recovery Recovery Acceptance RPD <br /> Analyte Units Level LCS LCSD Criteria (Limit 20) <br /> Benzene 1,.gIL (ppb) 25 105 105 66.119 0 <br /> Toluene µglL (ppb) 25 102 103 65-119 1 <br /> Ethylbenzene uglL (ppb) 25 104 105 62-125 1 <br /> Xylenes µglL(ppb) 75 104 105 65-123 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 /> 9 <br />