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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 59501524 <br /> Project. 1775-23.1: 001 /TO## 17075 00 12168 Stockton Date Collected: 11/29/95 <br /> Sample Matrix Water Date Received: 12/1/95 <br /> Date Extracted: NA <br /> I <br /> Date Analyzed: 12/8-11/95 <br /> Matri- Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> EPA Metliods 5030/California DHS LUFT Method <br /> Units ug/L(ppb) <br /> Sample Name MW-1 (54) <br /> Lab Code <br /> Percent Recover,* <br /> CAS Relative <br /> Spike Li,vel Sample Spike Result Acceptance Percent <br /> Analvte MS DMS Re%ult MS DMS MS DMS Limits Difference <br /> Gasoline 50 000 50 000 46 000 96,000 95 000 100 98 67-121 1 <br /> DMSISMN19a <br /> Page 8 <br />