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COLUMBIA ANALYTICAL SERVICES. INC. ; <br /> Client: EMCON Associates Date Received- 04/23/92 <br /> Project, EMCON Project No G71-29 01 Work Order#t SJ92-0490 <br /> Arco Facility No 2130 Sample Matrix: Water <br /> i <br /> OA/OC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Sample Name Dae Analyzed Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> MW-1 (73) 04/27192 84 <br /> MW-2 (72) 04/29/92 114 • <br /> MW-3 (72) 05/01/92 99 <br /> Method Blank 04/27/92 97 <br /> Method Blank 04/29/92 96 <br /> Method Blank 05101/92 92 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> ' The surrogate used on this sample was 4-Bromofluorobenzene <br /> Approved by Date GL b, Z_ff <br /> 5 <br />