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' COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 5951234 <br /> Project: 1775-237.001 /TO# 17075.00/ 2186 Stockton Date Collected: 9/25/95 <br /> Sample Matrix: Water Date Received: 10/2/95 <br /> Date Extracted: NA <br /> Date Analyzed: 10/4,5195 <br /> Matrix Spike/Duplicate Matrix Spike Sununary <br />' BTE <br /> EPA Methods 5030/8020 <br /> Units: ug/L (Ppb) - <br />' <br /> Sample Name: Batch <br /> p QC <br />' Lab Cade: S951203-0111 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analvte MS DMS Result MS DMS %,IS DMS Limits Difference <br /> Benzene 1,000 1,000 110 970 1,000 86 89 75-135 3 <br /> Toluene 1.000 1,000 <20 * 870 910 87 91 73-136 4 <br /> Ethvibenzene 1,000 1,000 41 900 940 86 90 69-142 4 <br /> 1 <br /> * liaised MRL due to high analvte concentration requiring sample dilution. <br /> DMS lSl06019q <br />' Page 7 <br />