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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client- EMCON Service Request: K9505156 <br /> Project- ARCO#760/EMCON Project No 1775-212 001 Date Collected: 8111195 <br /> Sample Matrix Water Date Received: 8/17/95 <br /> Date Extracted. 8/29195 <br /> Date Analyzed 8129-30195 <br /> i <br /> Dupltcate Summary <br /> Total and Nonpolar Oil and Grease <br /> Standard Method SM 552013&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 /> Total Oil and Grease K9505156-002 I ND ND ND - 40 <br /> Nonpolar Oil and Grease K9105156-002DUP I ND ND ND - 40 <br /> SM Standard Methods for the Examination of Water and Wastewater, 17th Ed, 1989 <br /> DUPIARPDJ120594 <br /> Page 15 <br />