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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/OC Report <br /> Client EMCON Associates Date Received 05/28/93 <br /> Project EMCON Project No OG71 017 01 Service Request No SJ93-0719 <br /> ARCO Facility No 434 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> W-1 A (77) 06/01/93 87 <br /> W-26 (86) 06/01/93 85 <br /> W-3 (68) 06/01/93 82 <br /> W-5 (69) 06/01/93 85 <br /> W-6 (69) 06/01/93 85 <br /> W-7 (69) 06/01/93 85 <br /> W-8 (69) 06/01/93 87 <br /> W-9 (78) 06/01/93 86 <br /> W-10 (78) 06/01/93 82 <br /> W-11 (79) 06/01/93 87 <br /> W-12 (771 06/01/93 86 <br /> W-1A (77) MS 06/01/93 92 <br /> W-1A (771 DMS 06/01/93 92 <br /> Method Blank 06/01/93 85 <br /> CAS Acceptance Criteria 70-130 <br /> TPN Total Petroleum Hydrocarbons <br /> L � <br /> Approved by Date <br /> 8 <br /> 1921 Ringwood Avenue - Son Jose Colifornto 95131 - Telephone 4081437 2400 - Fox 4081437 9356 <br />