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GOLDEN STATE if CAS LABORATORIES, INC <br /> QA/QC Report <br /> Client EMCON Associates Data Analyzed 09/09/93 <br /> Project ARCO Products Company/#OG71-018 01/SJ93-1091 Service Request No . LA932740 <br /> Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 602/Modified 8015/California DHS LUFT Method <br /> mg/L (ppm)/Ng/L (ppb) <br /> Lab Code LA2742-2 <br /> Percent R a c o v a r y <br /> EPA Relative <br /> Spike Sample Spike Result Acceptance Percent <br /> Analyte Level Result MS DMS MS DMS Criteria Difference <br /> Benzene 800 ND 76 6 760 96 95 39-150 1 <br /> Toluene 800 ND 773 76 4 97 96 46-148 1 <br /> Ethylbenzene 800 ND 745 73 4 93 92 32-160 1 <br /> TPH as Gasoline 200 ND 1 88 1 76 94 88 70-140 7 <br /> TPH Total Petroleum Hydrocarbons <br /> ND None Detected at or above the method reporting limit <br /> Y <br /> Approved by Ack— Date 9'1 s`� <br /> 6925 CANOGA AVENUE 0 CANOGA PARK, CA 91303 111 818 587-5550 ■ FAX 818 587-5555 <br />