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1 �r� <br /> COLUMBIA ANALYTICAL SERVICES INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 06/11/93 <br /> 1 Project EMCON Project No OG71-038 01 Service Request No SJ93-0776 <br /> ARCO Facility No 2168 Sample Matrix Water <br /> I <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LOFT Method <br /> Sample Name Date Analyzed Percent Recover <br /> a,a,a-Trifluorotoluene <br /> 1 MW-1 (54) 06/17/93 89 <br /> MW-2 (53) 06/17/93 94 <br /> MW-3 (53) 06/17/93 89 <br /> MW-4 (59) 06/17/93 90 <br /> MW-5 (55) 06/17/93 90 <br /> 1� MS 06/17/93 86 <br /> DMS 06/17/93 91 <br /> Method Blank 06/17/93 83 <br /> 1 CAS Acceptance Criteria 70-130 <br /> 1 <br /> 1 <br /> 1 <br /> Approved by Date 197�- <br /> 1]. <br />