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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client: EMCON Service Request S950638 <br /> Project- ARCO Facilitv No 760 I EMCON Project No 1775-212 001 Date Collected 5/16/95 <br /> Sample Matrix* Water Date Received. 5/18195 <br /> Date Extracted- NA <br /> Date Analyzed 5/23/95 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LOFT Method <br /> Percent Recovery <br /> Sample Name Lab Code a,cc,oc-Trifluorotolucne <br /> MW-1 (72) S950638-001 103 <br /> MW-2 (73) S950638-002 113 <br /> MW-3 (73) 5950638-003 109 <br /> (MS) S950624-005 108 <br /> (DMS) S950624-005 105 <br /> Method BIank 5950523-WB1 94 <br /> CAS Acceptance Limits 69-116 <br /> Approved By Date z- <br /> SURIM2994 n <br /> 0638 XLS GBTx s,w 5f3ol95 Page No n 5 <br /> 1921 Ringwood Avenue San Jose California 95131 • Telephone 4081407-2400 • Fax 4081407-9356 <br />