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COLUMBIA ANALYTICAL SERVICES. INC. <br /> 1 <br /> • Client EMCON Associates Date Received 10/08/92 <br /> Project: EMCON Project No OG71-029 01 Work Order #I SJ92-1247 <br /> Arco Facility No 2130 Sample Matrix- Water <br /> 1 <br /> QA/OC Report <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> ,ug/L (ppb) <br /> i <br /> 1 <br /> Sample Name MW-3-1731 <br /> Date Anaiyzed 10/12/92 <br /> Percent Recovery <br /> Sample Spike Result Acceptance <br /> Analytes Spike Level Result MS DMS MS DMS Criteng <br /> Benzene 25 5 8 282 286 90 91 39-150 <br /> Toluene 25 ND 236 240 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 />• <br /> Approved by u Date - njll� Ze <br /> 8 <br />