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1 <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 04/07/93 <br /> Project EMCON Project No OG71-029 01 Service Request No : SJ93-0472 <br /> ARCO Facility No 2130 <br /> i <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> ,ug/L (ppb) <br /> i <br /> Date Analyzed 04/14193 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br />' Analyte Value Result Recovery Criteria <br /> Benzene 25 246 98 85-115 <br /> Toluene 25 255 102 85-115 <br /> Ethylbenzene 25 245 98 85-115 <br /> Total Xylenes 75 72 9 97 85-115 <br /> TPH as Gasoline 250 229 92 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date _ y_.2 9 3, <br /> 6 <br />