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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client ARCO Products Company Servile Request 5960328 <br /> Protect 21775-234 002/#TO19350 001#2168 STOCKTON Datc. Collected 2/27/96 <br /> Sample Matrix Water Date RL en ed 2/28196 <br /> Date Ext[dLted NA <br /> Date AnalvzLd 3/8/96 <br /> Matrix Spike/Duplicate Matrix Spike Sununary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L.(ppb) <br /> Sample Name Batch QC <br /> Lab Code S96003i5-001MS <br /> PLrc4nt [ILLOVCI v <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analvte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 25 25 ND 227 22 9 91 92 75-135 1 <br /> Toluene 25 25 ND 224 226 90 90 73-136 1 <br /> Ethylbenzene 25 25 ND 223 222 89 89 69442 <1 <br /> OMS I S1060194 <br /> Page 10 <br />