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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC, Report <br /> Client: EMCON Associates Date Received: 03/05/93 <br />• Project: EMCON Project No. OG71-033.01 Service Request No.: SJ93-0322. <br /> ARCO Facility No. 548 Sample Matrix: Water <br /> " I <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/$020/California DHS LUFT Method <br />• <br /> 6-@-m_16-@-m_ple Name Dole Analyzed Percent Recovery <br />• a,a,a-Trifluorotoluene <br /> MW-2 (61) 03/10/93 97. <br /> MW-3162) 03/10/93 96. <br /> MW-4 163) 03/10/93 95. <br />•i MS 03/10/93 104. <br /> DMS 03/10/93 103. <br /> Method Blank 03/10/93 95. <br />• <br /> CAS Acceptance Criteria 70-130 <br />• <br /> TPH Total Petroleum Hydrocarbons <br />• <br /> Approved by: / l Date: � 1 � <br />• <br /> 6 <br />