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COLUMBIA ANALYTICAL SERVICES, INC <br /> r <br /> QA/0C Report <br /> 1 <br /> Client EMCON Associates Date Received 03/12/93 <br /> Project EMCON Project No OG71-038 01 Service Request No SJ93-0368 <br /> ARCO Facility No 2168 <br /> Initial Calibration Verification , <br /> STEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> pg/L (ppb) <br /> Date Analyzed 03/19/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> i Benzene 25 254 102 85-115 <br /> Toluene 25 259 104 85-115 <br /> Ethylbenzene 25 252 101 85-115 <br /> Total Xylenes 75 765 102 85-115 <br /> TPH as Gasoline 250 258 103 90-110 <br /> Date Analyzed 03/22/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Ana! a Value Result Recovery Criteria <br /> Benzene 25 249 100 85-115 <br /> Toluene 25 25 1 100 85-115 <br /> Ethylbenzene 25 245 98 85-115 <br /> Total Xylenes 75 72 9 97 85-115 <br /> TPH as Gasoline 250 230 92 9d-110 <br /> TPH Total Petroleum Hydrocarbons <br /> iu Ano Z� <br /> Approved by Date / 9/--:� <br />