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COLUMBIA ANALYTICAL SERVICES,INC. <br /> r <br /> QA/QC Report <br /> Client: EMCON Associates Service Request: 5950194 <br /> Project: ARCO Facility No 2076/EMCON Project No 1775-220 01 Date Collected: 2114/95 <br /> Sample Matrix Water Date Received: 2116/95 <br /> Date Extracted: NA <br /> Date Analyzed 2/22,23/95 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Percent Recovery <br /> Sample Name Lab Code a,cc,a-Tnfiuorotoluene <br /> MW-1(61') 5950194-001 98 <br /> MW-2(62') 5950194-002 97 <br /> MW-3(62') S950194-003 96 <br /> MW-4(61'} S950194-004 97 <br /> MS 5950211-001MS 101 <br /> DMS 5950211-001DMS 102 <br /> Method Blank S950222-)VB1 92 <br /> CAS Acceptance Limits 69-116 <br /> Approved By Date <br /> SURIl062994 - <br /> Page 5 <br /> 1921 Ringwood Avenue • Son lose California 95131 • Telephone 4081437 2400 0 Fox 4081437 9356 <br />