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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client ARCO Products Companv Service Request: 59600768 <br /> Project 548 STOCKTON/21775-206 002/TO#19350 00 Date Collected 5/10/96 <br /> Sample MatnX Water Date Received. 5/15/96 <br /> Date Extracted: NA <br /> Date Analyzed 5116196 <br /> Matrix Spike/Duplicate Matnr Spike Summary <br /> TPH as Gasoline <br /> EPA Methods 5030/Califomia DHS LU`FT Method <br /> Units uz/L (ppb) <br /> Sample N.imc Batch QC <br /> Lab Code S9600755-001 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample SpikeResult Acceptance Percent <br /> Analvtc MS DMS RL-Wit MS DMS MS DMS Limits DiffLrenLC <br /> Gasoline 250 250 ND 240 250 96 100 67-121 4 <br /> DMSM060194 <br /> Page 8 <br />