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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client- EMCON Associates Date Received 03/03/93 <br /> I Project EMCON Project No OG71-051 01 Service Request No SJ93-0304 <br /> ARCO Facility No 6020 Sample Matrix Water <br /> I <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 /> i a,a,a-Trnfluorotoluene <br /> MW-1 139) 03/09/93 101 <br /> MW-2 (38) 03/09/93 100 <br /> MW-3 (36) 03/09/93 100 <br /> MW-4 (34) 03/09/93 100 <br /> MS 03/09/93 1 1 1 <br /> DMS 03/09/93 <br /> Method Blank 03/09/93 94 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date Aal /=� 91 J <br />