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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request. 5951020 <br /> Protect 1775-234 0011 TO# 17075 00/2168 Stockton Date Collected: 8/I5/95 <br /> Sample Matrix Water Date Received: 8116/95 <br /> Date Extracted NA <br /> Date Analyzed 8/26/95 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Halogenated Volatile Organics <br /> EPA Method 601 <br /> Units ug/L,(ppb) <br /> Sample Name Batch QC <br /> Lab Code 5951015-001 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acccptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Limits Difference <br /> 1,1-Dichloroethenc 10 10 ND 809 873 81 87 69-142 7 <br /> Trichloroethene 10 10 ND 870 901 87 90 42-148 3 <br /> Tetrachloroethene 10 10 ND 873 895 87 90 80-136 3 <br /> DMSIS1060194 <br /> Page 15 <br />