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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client: EMCON Associates Date Received 11/01/93 <br /> Project EMCON Project No OG71-038 01 Service Request No SJ93-1339 <br /> ARCO Facility No 2168 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Oil and Grease, IR <br /> EPA Method SM 5520 C <br /> mg/L (ppm) <br /> Percent Recovery <br /> CAS <br /> Spike Sample Spike Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> Hydrocarbon Mix 80 107 174 16 2 84 69 56-151 <br /> SM Standard Methods for the Examination of Water and Wastewater, 17th Ed , 1989 <br /> Approved by Date 1 1 - I'a ``f <br /> 8074 <br />