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' • FRIEDMAN & BRUYA, INC. <br /> ' ENVIRONMENTAL CHEMISTS <br /> Date of Report: 07/24/98 <br /> ' Date Received: 07/10/98 <br /> Project: 4780 <br /> ' QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF SOIL SAMPLES <br /> FOR BENZENE, TOLUENE, ETHYLBENZENE,AND XYLENES <br /> ' USING EPA METHOD 8020A <br /> Laboratory Code: 807048.06(Duplicate) <br /> ' Reporting Sample Duplicate Acceptance <br /> Analyte Units Result Result RPD Criteria <br /> Benzene µg/g (ppm) <0.005 <0.005 nm 0.20 <br /> Toluene 1 g/g (ppm) <0.005 <0.005 nm 0-20 <br /> ' Ethylbenzene µg/g (ppm) <0.005 <0.005 nm 0.20 <br /> Xylenes F:g/g(ppm) <0.005 <0.005 nm 0.20 <br /> ' Laboratory Code: 807048.05 (Duplicate) <br /> Reporting Sample Duplicate Acceptance <br /> Analyte Units Result Result RPD Criteria <br /> Benzene n1g (ppm) <0.005 <0.005 nm 0.20 <br /> Toluene µg/g (ppm) <0.005 <0.005 nm 0.20 <br /> Ethylbenzene n/g (ppm) <0.005 <0.005 nm 0.20 <br /> ' Xylenes µg/g (ppm) <0.005 <0.005 nm 0.20 <br /> ' Laboratory Code: 807048-05 (Matrix Spike) <br /> Reporting Spike Sample %Recovery %Recovery Acceptance <br /> Analyte Units Level Result MS MSD Criteria RPD <br /> ' Benzene µg/g (ppm) 1 <0.005 75 70 55.104 7 <br /> Toluene n/g (ppm) 1 <0.005 71 67 56.107 6 <br /> Ethylbenzene n/g (ppm) 1 <0.005 71 67 57.108 6 <br /> Xylenes n/g (ppm) 3 <0.005 69 65 53.111 6 <br /> Laboratory Code: Laboratory Control Sample <br /> ' Reporting Spike %Recovery %Recovery Acceptance <br /> Analyte Units Level LCS LCSD Criteria RPD <br /> Benzene µg/g(ppm) 1 80 83 57-118 4 <br /> ' Toluene n/g(ppm) 1 76 79 67-114 4 <br /> Ethylbenzene µg/g(ppm) 1 75 78 68-114 4 <br /> Xylenes µg/g(ppm) 3 73 77 68-112 5 <br /> 1 <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 /> 1 <br /> 1 <br />