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COLUMBIA ANALYTICAL SERVICES. INC. - <br /> • Client, EMCON Associates Date Received: 10/08/92 <br /> Project: EMCON Project No OG71-029 01 Work Order fit: 5.192-1247 <br /> Arco Facility No 2130 Sample Matrix Water <br /> QA/QC Report <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Vg/L (ppb) <br /> I <br /> Sample Name MW-3 1731 <br /> Date Analyzed 10/12/92 <br /> Percent Recovery <br /> Sample Spike Result Acceptance <br /> Analytes Spike Level Result MS DM31 MS DMS Critena <br /> Benzene 25 58 282 286 90 91 39-150 <br /> Toluene 25 ND 23 6 240 94 96. 46-148 <br /> Ethylbenzene 25 ND 235 241 94 96. 32-160 <br /> ND None Detected at or above the method reporting limit <br /> Approved by Date Ik Je/' 24 <br /> 0 IYFL8 <br />