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v COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client EMCON Service Request- S950622 <br /> Project ARCO Facility No 548/EMCON Project No 1775-206 001 Date Collected- 5/12/95 <br /> Sample Matrix Water Date Received 5115195 <br /> Date Extracted NA <br /> Date Analyzed 5/22195 <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,a,a-Trrfluorotolucne <br /> MW-1 (56) 5950622-001 95 <br /> MW-2 (6 1) 5950622-002 88 <br /> MW-3 (62) 5950622-003 92 <br /> MW-4(63) 5950622-004 92 <br /> MW-5 (6 1) 5950622-005 95 <br /> MW-6 (58) 5950622-006 93 <br /> MW-4 (63) (MS) 5950622-004MS 92 <br /> MW-4 (63)(DMS) 5950622-004DMS 95 <br /> Method BIank 5950522-WB 1 92 <br /> CAS Acceptance Limits 69-116 <br /> Approved By <br /> pp Date � <br /> SUR11062994 <br /> 0621 XLS G=SrW 5126/95 Nc 05 <br /> 5 <br /> 1921 Ringwood Avenue • San Jose California 95131 • Telephone 408/437 2400 • Fax 408/437 9356 <br />