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GOLDEN STATE / CAS LABORATORIES, INC <br /> QA/QC Report <br /> Client. EMCON Associates Date Analyzed. 09/08-09/93 <br /> Project. ARCO Products Company/#OG71-018 01/SJ93-1091 Service Request No - LA932740 <br /> LCS Matrix: Water <br /> Laboratory Control Sample Summary <br /> STEX and TPH as Gasoline <br /> EPA Methods 602/Modified 8015/California DHS LUFT Method <br /> mg/L (ppm)/Ng/L (ppb) <br /> EPA <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br />• Benzene 800 789 99 39-150 <br /> Toluene 800 798 100 46-148 <br /> Ethylbenzene 800 770 96 32-160 <br /> TPH as Gasoline 200 1 80 90 70-140 <br /> TPH Total Petroleum Hydrocarbons <br /> 5 <br /> Approved by d/l� G, Date1"'0 'y> <br /> 6925 CANOGA AVENUE X CANOGA PARK, CA 91303 0 818587-5550 1111 FAX 818587-5555 <br />