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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client- ARCO Products Company Service Request: S9600831 <br /> Project 760 LODI 1 421775-212 002/TO#19350 00 Date Collected, 5/23196 <br /> Sample Matnx Water Date Received: 5124/96 <br /> Date Extracted: NA <br /> Date Analyzed 5/31/96 <br /> Matnx Spike/Duplicate Matn%,Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L (ppb) <br /> Sample Name Batch QC <br /> Lab Code 59600810-003 <br /> Percent Recovery <br /> CAS Relat«e <br /> Spike LLvel Sample Spike Result Acceptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 25 25 ND 240 250 96 100 75-135 4 <br /> Toluene 25 25 ND 244 25 3 98 101 73-136 4 <br /> Ethyibenzene 25 25 ND 244 25 5 98 102 69-142 4 <br /> DMS 151060194 <br /> Page 9 <br />