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COLUMBIA ANALYTICAL SERVICES, INC <br /> DA/QC Report <br /> 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 Matnx. Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/Cabfomia DHS LUFT Method <br /> Samt)fe-Name Date Analyzed Percent Recovery, <br /> a,a,a-Trifluorotoluene <br /> MW-1 (54) 12/24/92 111 <br /> MW-2 153) 12/24/92 112. <br /> MW-3 (53) 12/24/92 11 1 <br /> MS 12/24/92 <br /> DMS 109 <br /> 12/24/92 <br /> 111 <br /> Method Blank 12124/92 101 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by: Date: 000941A�r,31 <br /> 0 <br />