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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 59600832 <br /> Project: 2186 Stockton/#21775-237.002/TO#19350.00 Date Collected: 5/23/96 <br /> Sample Matrix: Water Date Received: 5/24/96 <br /> Date Extracted: NA <br /> Date Analyzed: 5/31/96 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units: ug/L (ppb) <br /> Sample Name: Batch QC <br /> Lab Code: S9600830-003 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 25 25 ND 24.0 25.0 96 100 75-135 4 <br /> Toluene 25 25 ND 24.4 25.3 98 101 73-136 4 <br /> Ethylbenzene 25 25 ND 24.4 25.5 98 102 69-142 4 <br /> I <br /> • <br /> DMS I Sl060194 <br /> Page 7 <br />