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COLUMBIA ANALYTICAL SERVICES, INC. <br /> Client: EMCON Associates Date Received: 09/09/92 <br /> Project: EMCON Project No. G71-33.01 Work Order #: S 92-1126 <br />• Arco Facility No. 548 Sample Matrix: Water <br />• <br /> QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LOFT Method <br />• <br /> Sample Name Date Analyzed Percent Recovery <br />• o,a,a-Trifluorotoluene <br /> MW-1 (56) 09/14/92 103.' <br /> MW-2 (60) 09/10/92 112. <br /> MW-3 (62) 09/10/92 111. <br /> MW-4 (64) 09/10/92 108. <br />• <br /> MW-2 (60) MS 09/10/92 122. <br /> MW-2 (60) DMS 09/10/92 117. <br /> Method Blank. 09/10/92 106. <br /> Method Blank. 09/14/92 97. <br />• <br /> CAS Acceptance Criteria 70-130 <br />• <br /> TPH Total Petroleum Hydrocarbons <br /> The surrogate used on this sample was 4-Bromofluorobenzene. <br /> Approved by� Date <br /> 6 <br />