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�r 1 <br /> FRIEDMAN&BRUYA, INC. <br /> i <br /> ENVMONMENTAL CHEMISTS <br /> Date of Report: 11/18/98 <br /> Date Received: 10/24/98 <br /> Project: C3499.01 <br /> QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF WATER <br /> SAMPLES FOR BENZENE, TOLUENE, ETHYLBENZENE,XYLENES AND <br /> GASOLINE USING EPA METHODS 8020A AND 5.015 <br /> Laboratory Code: 810094-01 (Duplicate) <br /> Relative <br /> Reporting Sample Duplicate Percent Acceptance <br /> Analyte _ Units Result Result Difference Criteria <br /> Benzene pg/L (ppb) <0.5 <0.5 nm 0-20 <br /> Toluene µg/L(ppb) <0.5 <0.5 nm 0-20 <br /> Ethylbenzene pg/L(ppb) <0.5 <0.5 nm 0-20 <br /> .Xylenes pg/L(ppb) <0.5 0.7 nm 0-20 <br /> MTBE pg/L(ppb) . <5 <5 nm 0-20' <br /> Gasoline pg/L(ppb) <50 <50 nm 0-20 <br /> Laboratory Code: 810137-01 (Matrix Spike) <br /> Relative <br /> Reporting Spike Sample %Recovery %Recovery Acceptance Percent <br /> Analyte Units Level Result MS MSD Criteria Difference <br /> Benzene pg/L(ppb) 100 7.9 109 107 80-119 2 <br /> Toluene pg/L(ppb) 100 8.0 110 107 68-131 3 <br /> Ethylbenzene µg/L(ppb) 100 2.0 110 107 69-129 3 <br /> Xylenes pg/L(ppb) 300 17 109 107 65-132 2 <br /> MTBE pg/L(ppb) 100 14 107 106 50-150 1 <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 pg/L(ppb) 100 94 95 84-135 .1 <br /> Xylenes pg/L (ppb) 300 95 96 87-132 1 <br /> MTBE pg/L(ppb) 100 97 96 80-129 1 <br /> Gasoline pg/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 /> f: <br />