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COLUMBIA ANALYTICAL SERVICES, INC <br /> M, QAIQC Report <br /> 1 Client EMCON Associates Date Received 03/12/93 <br /> Project- EMCON Project No OG71-038 01 Service Request No SJ93-0368 <br /> ARCO Facility No 2168 Sample Matrix Water <br /> 1 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> 1 ug/L (Ppb) <br /> Date Analyzed 03/19/93 <br /> Percent Recovery <br /> . Spike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> Benzene 25 ND 266 26 9 106 108 39-150 <br /> Toluene 25 ND 258 263 103 105 46-148 <br /> Ethylbenzene 25 ND 25 1 25 9 100 104 32-160 <br /> ND None Detected at or above the method reporting limit <br /> Approved byDate `y�r�! C/- ��2 <br />