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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: EMCON Associates Service Request: K947479S <br /> Project: Foothill/#0939-004.08 Date Collected: 11/28/94 <br /> Sample Matrix: Water Date Received: 12/1/94 <br /> Date Extracted: 12/5/94 <br /> Date Analyzed: 12/5,6/94 <br /> Surrogate Recovery Summary <br /> Organochlorine Pesticides and Polychlorinated Biphenyls(PCBs) <br /> EPA Methods 3510/8080 <br /> Percent Recovery Percent Recovery <br /> Sample Name Lab Code Tetrachloro-m-xylene Decachlorobiphenyl <br /> LW-1 K947479-001 96 102 <br /> MW-1 K947479-002 102 93 <br /> MW-2 K947479-003 97 73 <br /> Method Blank K947479-MB 106 83 <br /> CAS Acceptance Limits: 25-103 30-135 <br /> Approved By: \ Wit' Date: <br /> SUR2/102194 -7 <br /> K947479S.XLS-w8080SM2(2)!/27/95 Pap No.: <br /> (1 (1 ('; 1 ,4 <br />