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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received- 01/22/93 <br /> Project: EMCON Project No OG71-029 01 Service Request No . SJ93.0096 <br /> ARCO Facility No 2130 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TFH as Gasoline <br /> EPA Methods 5030/8020/California DHS LOFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> MW-1 174) 02/01/93 94 <br /> MW-2 172) 01/28/93 103 <br /> MW-3 (73) 01/27/93 94 • <br /> MW-4174) 02/01/93 89 <br /> MW-5 (76) 01/28/93 90 <br /> MW-4 (74) MS 01/28/93 100 <br /> MW-4 (74) DMS 01/28/93 98 <br /> Method Blank 01/27/93 93 <br /> Method Blank 01/28/93 95 <br /> Method Blank 02101193 84 <br /> CAS Acceptance Criteria 70-120 <br /> TPH Total Petroleum Hydrocarbons <br /> 4 The surrogate used for this sample was 4-Bromofluorobenzene <br /> Approved by- Date. <br />