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FRIEDMAN & BRUYA, INC. <br /> ENVIRONMENTAL CHEMISTS <br /> Date of Report: 06/11/02 <br /> Date Received: 05123/02 <br /> Project: 5011.001 (Roberts Property) <br /> QUALITY ASSURANCE RESULTS FOR THE ANALYSIS OF WATER <br /> SAMPLES FOR TOTAL PETROLEUM HYDROCARBONS AS DIESEL <br /> USING EPA METHOD 8015M <br /> Laboratory Code: Laboratory Control Sample <br /> Percent Percent <br /> Reporting Spike Recovery Recovery Acceptance RPD <br /> Analyte Units Level LCS LCSD Criteria (Limit 2 <br /> Diesel 4g/L (ppb) 2,500 86 81 58-142 6 <br /> Laboratory Code: Laboratory Control Sample Silica Gel <br /> Percent Percent <br /> Reporting Spike Recovery Recovery Acceptance RPD <br /> Analyte Units Level LCS LCSD Criteria (Limit 20) <br /> Diesel µg/L(ppb) 2,500 92 95 65.135 3 <br /> 10 <br />