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FRIEDMAN & BRUYA, INC. <br /> ENVIRONMENTAL CHEMISTS <br /> Date of Report: 09/28/99 <br /> Date Received: 09/24/99 <br /> Project: 5650 <br /> QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF SOIL SAMPLES <br /> FOR VOLATILES BY EPA METHOD 8260B <br /> Laboratory Code: 909106.01 (Duplicate) <br /> Relative <br /> Reporting Sample Duplicate Percent Acceptance <br /> Analyte Units Result Result Difference Criteria <br /> Methyl t-butyl ether (MTBE) pg/kg(ppb) <5 <5 am 0-20 <br /> Benzene pg/kg (ppb) <5 <5 nm 0-20 <br /> Trichloroethene gg/kg(ppb) <5 <5 nm 0-20 <br /> LaboratoryCode: 909106.01 (MatrixSpike) <br /> Reporting Spike Sample %Recovery %Recovery Acceptance <br /> Analyte Units Level Result MS MSD Criteria RPD <br /> Methyl t-butyl ether(MTBE) gg/kg (ppb) 50 <5 92 79 50.150 15 <br /> Benzene gg/kg(ppb) 50 <5 85 76 50-150 11 <br /> Toluene gg/kg(ppb) 50 <5 81 74 50-150 9 <br /> Laboratory Code: Laboratory Control Sample <br /> Reporting Spike %Recovery- %Recovery Acceptance <br /> Analyte Units Level LCS LCSD Criteria RPD <br /> Methyl t-butyl ether(MTBE) pg/kg('ppb) 50 92 99 50.150 7 <br /> Benzene gg/kg(ppb) 50 90 93 50.150 3 <br /> Toluene gg/kg(ppb) 50 86 82 50.150 4 <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 /> 35 <br />