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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> i Client EMCON Associates Date Received. 12/18/92 <br /> Project- EMCON Project No OG71-038 01 Service Request No SJ92-1604 <br /> ARCO Facility No 2168 Sample Matrix Water <br /> 1 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFf Method <br /> I <br /> Sample Name Date Analyzed Percent Recovery, <br /> a,a,a-Trifluorotoluene <br /> MW-1 (54) 12/24/92 113 <br /> MW-2 (53) 12/24/92 112 <br /> MW-3 (53) 12/24/92 111 <br /> MS 12/24/92 109 <br /> DMS 12/24/92 ill <br /> Method Blank 12/24/92 101 <br /> 1 <br /> CAS Acceptance Criteria 70-130 <br /> r <br /> TPH Total Petroleum Hydrocarbons <br /> f <br /> Approved by l Date, 1 <br />