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COLUMBIA ANALYTICAL SERVICES. INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 08/20/93 <br /> Project EMCON Project No OG71-051-01 Service Request No SJ93-1041 <br /> ARCO Facility No 6020 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br />` ug/L (ppb) <br /> Date Analyzed 08/27/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Anal3ge Value Result Recovery Catena <br /> I! Benzene 25 24 2 97 85-115 <br /> Toluene 25 24 9 100 85-115 <br /> Ethyibenzene 25 23 2 93 85-115 <br /> Total Xylenes 75 70 2 94 85-115 <br /> TPH as Gasoline 250 248 99 90-110 <br /> I <br /> 57 <br /> I <br /> I <br /> 1� <br /> Approved by Date <br /> 1 <br /> 1921 Ringwood Avenue • Son lose Californio 95191 Telephone 4081437 2400 Fox 408/497 9356 <br />