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COLUMBIA ANALYTICAL SERVICES, INC <br /> OA/QC Report <br /> • Client EMCON Associates Date Received 04/27/93 <br /> Project EMCON Project No OG71-017 01 Service Request No SJ93-0564 <br /> ARCO Facility No 434 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline - <br /> EPA Methods 503018020/California DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> W-12 i77'! 05/03/93 88 <br /> MS 05/03/93 94 <br /> DMS 05/03/93 96 <br /> Method Blank 05/03/93 88, <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date 4 <br /> 5 <br /> 1921 Ringwood Avenue • Son Jose Coliforrno 93131 • Telephone 4081437 2400 0 Fax 4081437 9356 <br />