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COLUMBIA ANALYTICAL SERVICES. INC <br /> QA/OC 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 Facdny No 2168 Sample Matroc: Water <br /> Matrix Spike/Dupficate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> yg/L (ppb) <br /> Date Analyzed 12/24/92 <br /> Percent Recovery <br /> • Spike CAS <br /> Spike Sample Rank Acceptance <br /> Analg�e ix2! Result M$--DM lM$ DMS Cr tat []a <br /> Benzene 25 NO 252 25.4 101 102 39-150 <br /> Toluene 25. NO 253 25.4 101 102 46-148 <br /> Ethylbenzene 25 NO 245 245 98 98 32-160 <br /> ND None Detected at or above the method reporting i,mrt <br /> Approved by: Date: <br /> 10 <br />