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COLUMBIA ANALYTICAL SERVICES,INC - <br /> j <br /> QA/QC Report <br /> Client EMCON Associates Service Request. S950194 <br /> Protect. ARCO Facility No 2076/EMCON Project No 1775-220 01 Date Collected- 2/14/95 <br /> Sample Matrix- Water Date Received 2/16/95 <br /> Date Extracted: NA <br /> Date Analyzed- 2/22, 23/95 <br /> Matrix Spike/Duplicate Matnx Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L (ppb) <br /> Sample Name Batch QC <br /> Lab Code S95021 1-001 <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 263 25 6 105 102 75-135 3 <br /> Toluene 25 25 ND 251 246 100 98 73-136 2 <br /> Ethylbenzene 25 25 ND 25 6 24 9 102 100 69-142 3 <br /> Approved ByQc,.e• �� � Date tel'/AQS <br /> DMS I Sl060194 <br /> Page 7 <br /> 1921 Ringwood Avenue • Son Jose Californlo 95131 • Telephone 408/437 2400 • Fox 408/437-9356 <br />