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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: 12/7,8/94 <br /> Surrogate Recovery Summary <br /> Chlorinated Herbicides <br /> EPA Method 8150A Modified <br /> Percent Recovery <br /> Sample Name Lab Code 2,4-Dichlorophenylacetic Acid <br /> LW-1 K947479-001 <l(a) <br /> MW-1 K947479-002 62 <br /> MW-2 K947479-003 68 <br /> Method Blank K947479-MB 67 <br /> CAS Acceptance Limits: 36-128 <br /> a Outside of acceptance limits. Insufficient sample quantity remained for additional analysis. <br /> Approved By: Date: 7,71C <br /> SURI/102194 <br /> K947479S.XLS-wa150sur(2)1/27/95 Page No.: <br /> (; 001 <br />