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COLUMBIA ANALYTICAL SERVICES, INC <br /> . Client EMCON Associates Date Received 07/10/92 <br /> Project EMCON Project No G71-29 01 Work Order # SJ92-0835 <br /> Arco Facility No 2130 Sample Matrix Water <br /> QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> i <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Tref luorotoluene <br /> MW-1 (73) 07/15/92 121 <br /> MW-2 (72) 07/16/92 119 <br /> MW-3 (73) 07/16/92 105 <br />� . MS 07/15/92 128 <br /> DMS 07/15/92 122 <br /> Method Blank 07/15/92 110 <br /> Method Blank 07/16/92 107 <br /> CAS Acceptance Criteria 70-130 <br /> I <br /> TPH Total Petroleum Hydrocarbons <br /> I <br /> 1 <br /> • <br /> 2 f <br /> Approved by Date <br /> ALV <br /> 1 <br />