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FRIEDMAN & BRUYA, INC. <br /> ENVIRONMENTAL CHEMISTS <br /> Date of Report: 11/26/97 <br /> Date Received: 11/22/97 <br /> Project: 4440 <br /> QUALITY ASSURANCE RESULTS <br /> FOR THE ANALYSIS OF SOIL SAMPLES FOR BTEX <br /> USING EPA METHOD 8260 <br /> Laboratory Code: 711089-01 (Duplicate) <br /> Reporting Sample Duplicate Acceptance <br /> Analyte Units Result Result RPD Criteria <br /> Benzene ug/g(ppm) <0.2 <0.2 nm 0-20 <br /> Toluene ug/g(ppm) <0.2 <0.2 nm 0-20 <br /> MTBE ug/g(ppm) <0.2 <0.2 nm 0-20 <br /> Laboratory Code: 711089-01 (MatrixSpike) <br /> Reporting Spike Sample %Recovery %Recovery Acceptance <br /> Analyte Units Level Result MS MSD Criteria RPD <br /> Benzene ug/g(ppm) 2 <0.2 66 72 55-103 9 <br /> Toluene ug/g(ppm) 2 <0.2 76 84 47-103 10 <br /> MTBE ug/g(ppm) 2 <0.2 108 95 65-135 14 <br /> Laboratory Code: Laboratory Control Sample <br /> Reporting Spike % Recovery % Recovery Acceptance <br /> Analyte Units Level LCS LCSD Criteria RPD <br /> Benzene ug/g(ppm) 2 85 89 70-109 5 <br /> Toluene ug/g(ppm) 2 87 90 69-104 3 <br /> MTBE ug/g(ppm) 2 89 96 65-135 7 <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 /> 24 <br />