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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> • Client EMCON Associates Date Received 04/21/93 <br /> I Project EMCON Project No OG71-051 01 Service Request No SJ93 0544 <br /> ARCO Facility No 6020 Sample Matrix Water <br /> i <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/CalLfornra DHS LUFF Method <br /> I <br /> Sample Name Date Analyzed Percent Recovery <br /> i <br /> a a,a-Trifluorotoluene <br /> MW-1 (39) 04/26/93 86 <br /> MW-2 (38) 04/26/93 84 <br /> MW-3 (36) 04/26/93 86 <br /> MW-4 (34) 04/26/93 89 <br /> • MS 04/26/93 109 <br /> DMS 04/26/93 106 <br /> Method Blank 04/26/93 87 <br /> CAS Acceptance Criteria 70-130 <br /> F <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by L14 P1 Date 1 <br /> 6 <br />