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COLUMBIA ANALYTICAL SERVICES, INC <br /> CIA/QC Report <br /> Client EMCON Associates Date Received 12/18/92 <br /> Project- EMCON Project No OG71-038 01 Service Request No SJ92-1604 <br /> ARCO Facility No 2168 Sample Matrix- Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> vg/L (ppb) <br /> Date Analyzed 12/24/92 <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Critens <br /> Benzene 25 NO 25 2 25 4 101 102 39-150 <br /> Toluene 25 NO 253 254 101 102 46-148 <br /> Ethyibenzene 25 NO 245 245 98 98 32-160 <br /> I <br /> 1 <br /> NO None Detected at or above the method reporting limit <br /> 1 <br /> 1 <br /> Approved by- 9 L44 Date: � .xr 36 X 9L <br /> 1 <br />