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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 /> Halogenated Volatile Organic Compounds <br /> EPA Methods 5030/601 <br /> (ppb) <br /> Sample Name MW-3 (54) <br /> Date Analyzed 11/03/93 <br /> Percent Recovery <br /> EPA <br /> Spike Sample Spike Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> 1,1-Dichloroethene 10 ND 109 104 109 104 59-145 <br /> Trichloroethene 10 ND 11 5 11 6 115 116 66-156 <br /> Tetra chloroethen e 10 ND 11 3 11 6 113 116 77-146 <br /> Approved by ue' , Date 1 -1 a -f3 <br /> 17 <br />