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FRIEDMAN & BRUYA, INC. <br /> ENVIRONMENTAL CHEMISTS <br /> Date of Report: 11/21/03 <br /> Date Received: 11/07/03 <br /> Project: Pombo Property, 06-6102-00-4700-201, F&BI 311051 <br /> QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF WATER <br /> SAMPLES FOR BENZENE, TOLUENE, ETHYLBENZENE, <br /> AND XYLENES <br /> USING EPA METHODS 8021B <br /> Laboratory Code: 311002-01 (Duplicate) <br /> Relative Percent <br /> Reporting Sample Duplicate Difference <br /> Analyte Units Result Result (Limit 20) <br /> Benzene µg2(ppb) <0.5 <0.5 nm <br /> Toluene pg/L(ppb) <0.5 <0.5 nm <br /> Ethylbenzene pg/L(ppb) <0.5 <0.5 nm <br /> Xylenes pg/L(ppb) <1.5 <1.5 nm <br /> Laboratory Code: Laboratory Control Sample <br /> Percent <br /> Reporting Spike Recovery Acceptance <br /> } Analyte Units Level LCS Criteria <br /> �'•/ Benzene pg/L(ppb) 25 100 77-116 <br /> Toluene pg/L(ppb) 25 98 64-126 <br /> Ethylbenzene pg/L(ppb) 25 99 67-124 <br /> Xylenes pg/L(ppb) 75 98 71-121 <br /> nm -The analyte was not detected in one or more of the duplicate analyses. Therefore, calculation of the <br /> RPD is not applicable. <br /> 11 � <br /> I <br />