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FREEDMAN & BRUYA, INC. <br /> ENVIRONN ENTAL CHEMISTS <br /> Date of Report: 08/11/02 <br /> Date Received: 05/24/02 <br /> Project: 5011.001 (Roberts Property) <br /> QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF SOIL SAMPLES <br /> FOR BENZENE, TOLUENE, ETHYLBENZENE,AND XYLENES <br /> USING EPA METHOD 8021B <br /> Laboratory Code: 205192-14 (Duplicate) <br /> Relative Percent <br /> Reporting Sample Duplicate Difference <br /> Analyte Units Result Result (Limit 20) <br /> Benzene µg/g (ppm) <0.005 <0.005 nm <br /> Toluene µglg (ppm) <0.005 <0.005 nm <br /> Ethylbenzene µglg (ppm) <0.005 <0.005 nm <br /> Xylenes µglg{ppm} X0.005 <0.005 nm <br /> Laboratory Code: 205192-14(Matrix Spike) <br /> Percent Percent <br /> Reporting Spike Sample Recovery Recovery Acceptance RFD <br /> Analyte Units Level Result MS MSD Criteria (Limit 20) <br /> Benzene µg/g (ppm) 1 <0.005 82 78 34-136 5 <br /> Toluene N.glg(ppm) 1 <0.005 82 78 35-140 5 <br /> Ethylbenzene 4glg(ppm) 1 <0.005 84 80 37-150 5 <br /> Xylenes 4glg(ppm) 3 <0.405 83 81 36-143 2 <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 4glg(ppm) 1 94 94 60-122 ❑ <br /> Toluene 4glg(ppm) 1 92 92 60-126 0 <br /> Ethylbenzene 4glg(ppm) ]. 95 96 56-130 1 <br /> Xylenes µg/g (ppm) 3 96 96 58-128 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 /> 32 <br />