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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Service Request S950645 <br /> Prosect ARCO Facilitv No 2076/EMCON Project No 1775-220 001 Date Collected. 5/15/95 <br /> Sample Matrix Nater Date Received- 5/18/95 <br /> Date Extracted NA <br /> Date Analyzed- 5/22-23/95 <br /> Surrogate Recovery Summary <br /> BTEX and"FPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Percent Recovery <br /> Sample Name Lab Code a,oL,a-Tnfluorotoiuene <br /> MW-1 (6 1) S950645-001 92 <br /> MW-2 (62) S950645-002 92 <br /> MW-3 (62 S950645-003 89 <br /> MW-4 (62) S950645-004 89 <br /> (MS) S950622-004MS 92 <br /> (DMS) 5950622-004DMS 95 <br /> Method Blank 5950522-WB1 92 <br /> CAS Acceptance Linuts 69-116 <br /> Approved By Date <br /> SUR 1/062994 <br /> 0645 XLS (ATX SrW 5126195 Page No n 5 <br /> 1921 Ringwood Avenue • Son Jose California 95134 • Telephone 408/437 2400 • Fox 4081407 9356 <br />