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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 01/21193 <br /> Project EMCON Project No OG71-018 01 Service Request No SJ93-0082 <br /> ARCO Facility No 2093 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 Pint Recovery <br /> a,a,a-Trifluorotoluene <br /> ATR-4 (29) 01/26/93 94 <br /> ATR-5 (27) 01/26/93 101 <br /> ATR-6 (26) 01/26/93 93 <br /> ATR-7 (26) 01/26/93 92. <br /> ATR-8 (24) 01/26/93 97 <br /> ATR-9 124) 01/26/93 92. <br /> ATR-10 (24) 01126/93 92. <br /> ATR-11 (23) 01/26/93 90 <br /> ATR-12 (24) 01/26/93 87 <br /> MS 01/26/93 96 <br /> DMS 01/26/93 97. <br /> Method Blank 01/26/93 95. <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> The surrogate used for this sample was 4-Bromofluorobenzene <br /> Approved by: Date ?Jim <br /> 8 <br /> 1921 Ringwood Avenue " Son Jose California 95131 a Telephone 4081437 2400 0 Fox 408/437-9356 <br />