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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client EMCON Associates Service Request K9501041 <br /> Project ARCO/Stockton/##1775-234 01 Date Collected 2/16/95 <br /> Sample Matrix: Water Date Received 2/22/95 <br /> Date Extracted: 2/28/95 <br /> Date Analyzed: 3/1/95 <br /> Duplicate Summar% <br /> Oil and Grease, Pour <br /> SM 5520 C& F <br /> Units mg/L (ppm} <br /> Duplicate Relative CAS RPD <br /> Sample Sample Percent Acceptance <br /> Sample Name Lab Code MRL Result Result Average Difference Limit <br /> MW-6(47') K9501041-006 0 5 3 5 3 8 3 6 8 30 <br /> SM Standard Methods for the Examination of Water and Wastewater, 17th Ed 1989 <br /> Approved By " Date <br /> DUPIARPD/102194 <br /> 01041PHC SPI 418ag P 316145% Page No <br /> 00040 <br />