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COLUMBIA ANALYTICAL SERVICES, INC <br /> AL a <br /> AVE <br /> Client EMCON Associates Date Received 05/14/92 - _ - <br /> Project EMCON Project No G71-17 01 Work Order # SJ92-0606 <br /> . Arco Facility No 434 Sample Matrix Water <br /> QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Sample Name Date Analvzgd Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> W-1 A 177? 05/21/92 123 <br /> W-2A 163! 05/21/92 81 <br /> W-2B (86) 05/21/92 81 <br /> W-3 1691 05/26/92 103 <br /> W-5 169) 05/21/92 98 <br /> W-6 169) 05/21/92 86 <br /> W-7 1691 05/21/92 101 <br /> W-8 (69) 05/21/92 84 <br /> . W-91781 05/26/92 88 <br /> W-10 (78) 05/21/92 105 • <br /> W-11 (79) 05/21/92 104 <br /> W-12 (77) 05/21/92 95 <br /> W-9 (78) MS 05/26/92 100 <br /> W-9 1781 MSD 05/26/92 123 <br /> Method Blank 05/21/92 104 <br /> Method Blank 05/26/92 100 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> " The surrogate used on this sample was 4-Bromofluorobenzene <br /> Approved by Date 24 �^ <br /> 8 <br /> ,074 Q .,..4 t e.n a C�� I. r,hf-,«,+­ 01;4"44 • TcIo Kh ,Na enareJ7 ')Ann • Fey dnAiAly 0356 <br />