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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> I Client EMCON Associates Date Received 08/04/93 <br /> Project EMCON Project No OG71-029 01 Service Request No SJ93-0960 <br /> ARCO Facility No 2130 <br /> Initial Calibration Verification <br /> BTEX and TPM as Gasoline <br /> 1 EPA Methods 5030/8020/DHS LUFT Method <br /> ,rg/L (ppb) <br /> Date Analyzed 08/10/93 <br /> 1 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> r <br /> Benzene 25 24 1 96 85-115 <br /> Toluene 25 24 9 100 85-115 <br /> Ethylbenzene 25 23 3 93 85-115 <br /> Total Xylenes 75 69 3 92 85-115 <br /> TPH as Gasoline 250 226 90 90-110 <br /> r <br /> r <br /> Approved by /�� L t Date U �� <br /> l <br /> 7 <br />