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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report 3 <br /> Client: EMCON Associates Date Received- <br /> Project: EMCON Project No OG71-038 01 a 03/12!3 <br /> J Service Request No. S.]93-0368 <br /> ARCO Facility No 2168 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/DHS LUFT Method <br /> u9/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 /> Benzene 25 25 4 102 85-115 <br /> Toluene 25 25 9 104 85-115 <br /> Ethylbenzene 25 25 2 101 85-115 <br /> Total Xylenes 75 76 5 102 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 /> Analyte 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 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by: Wv� Date- !� Z� / '01Z <br />