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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 04/21/93 <br /> Project EMCON Project No OG71 050 01 Service Request No SJ93-0541 <br /> ARCO Facility No 2076 Sample Matrix Water <br /> 1 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LUFT Method <br /> lr <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> MW-1 161) 04/26/93 84 <br /> MW-2 (62) 04/26/93 83 <br /> MW-3 (62) 04/26/93 88 <br /> MW-4 (62) 04/26/93 85 <br /> • MS 04/26/93 109 <br /> DMS 04/26/93 106 <br /> Method Blank 04/26/93 87 <br /> 1 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> 1 <br /> i <br /> Approved by Date <br /> 1 <br /> 6 <br />