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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client- EMCON Associates Date Received: 03/12/93 <br /> Project: EMCON Prosect No OG71-038 01 Service Request No.: SJ93-0368 <br /> ARCO Facility No 2168 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 /> MW-1 (54) 03/19/93 92 <br /> MW-2 (53) 03/19/93 93 <br /> MW-3 (53) 03/19/93 91 <br /> MW-4 (59) 03/22/93 96 <br /> MW-5 (55) 03/19/93 100 <br /> MS 03/19/93 97 <br /> DMS 03/19/93 94 <br /> Method Blank 03/19/93 89 <br /> Method Blank 03/22/93 85 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date <br />