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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client. EMCON Associates Date Received 01/21/93 <br /> Project EMCON Project No OG71-018 01 Service Request No SJ93-0082 <br /> ARCO Facility No 2093 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Ng/L (ppb) <br /> Date Analyzed 01/26/93 <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> An. alyte Level Result MS_ DMS MS DMS Criteria <br /> Benzene 1,000 740 1,670 1,810 93 107 39-150 <br /> Toluene 1,000. 270 1,280 1,330 101 106 46-148 <br /> Ethylbenzene 1,000. 780. 1,810 1,900 103. 112 32-160 <br /> Approved by: Date. �. . 7 <br /> 9 <br /> 1921 Rinawood Avenue 0 Son Jose California 95131 • Telephone 408/437-2400 Fox 408/437 9356 <br />