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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client- EMCON Associates Date Received- 01/22/93 <br /> Project- EMCON Project No OG71-029 01 Service Request No . SJ93-0096 <br /> ARCO Facility No 2130 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> STE <br /> EPA Methods 5030/8020 <br /> pgiL (ppb) <br /> Sample Name MW-4 1741 <br /> Date Analyzed* 01/28/93 <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> Anal Level Result MS DMS MS DMS Criteria <br /> Benzene 250 160 393 413 93 101 39-150 <br /> Toluene 250 6 9 247 264 96 103 46-148 <br /> Ethylbenzene 250 ND 247 259 99 103 32-160 <br /> ND None Detected at or above the method reporting limit <br /> � i <br /> ti <br /> Approved by: Date: <br /> s per. -- <br />