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COLUMBIA ANALYTICAL SERVICES. INC. <br /> j <br /> QA/OC Report <br /> Client: EMCON Associates Date Received: 06/09/93 <br />,•� Project: EMCON Project No. OG71-033.01 Service Request No.: SJ93-0761 . <br /> ARCO Facility No. 548 Sample Matrix: Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030:8020/Cailfornia DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> • <br /> MW-1 (561 06/15/93 100, <br /> MW-2 (611 06/15193 94, <br /> MW-3 (62) 06/15193 91, <br /> MW-4 (63) 06115193 92. <br /> MW-5 (61) 06/17/93 104. <br /> MW-2 (61) MS 06/15/93 93. <br /> MW-2 (61) DMS 0 6115,9 3 87. <br /> Method Blank 06/15/93 90, <br /> Method Blank 06/17,93 83. <br /> i• <br /> CAS Acceptance Criteria 70-130 <br />• <br /> i <br />• Approved by: Date: <br /> 9 <br />