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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> l• Client EMCON Associates Date Received 04/21/93 <br /> Project EMCON Project No OG71-051 01 Service Request No SJ93-0544 <br /> ARCO Facility No 6020 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/80201DHS LUFT Method <br /> u9/L (Ppb) <br /> Cate Analyzed 04/26/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> i <br />• Analyte Value Result Recovery Criteria <br /> Benzene 25 24 4 98 85-115 <br /> Toluene 25 25 5 102 85-115 <br /> Ethylbenzene 25 24 2 97 85-115 <br /> Total Xylenes 75 73 1 97 85-115 <br /> TPH as Gasoline 250 241 96 90-110 <br /> i <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Ott V Date z -� <br /> i <br /> 5 <br />