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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/OC Report <br /> Client EMCON Associates Date Received 04/16/93 <br /> Project EMCON Project No OG71-018 01 Service Request No SJ93-0521 <br /> ARCO Facility No 2093 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> STE <br /> EPA Methods 5030/8020 <br /> Ng/L (Ppb) <br /> Sample Name ATR-1 u <br /> Date Analyzed 04/23/93 <br /> Percent Recovery <br /> Spoke CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Resuft MS DMS MS DMS Criteria <br /> Benzene 25 ND 284 29 3 114 117 76-122 <br /> Toluene 25 ND 286 29 5 114 118 75-127 <br /> Ethylbenzene 25 1 5 297 305 113 116 70-135 <br /> NO None Detected at or above the method reporting lima <br /> Approved by RIM Date 1, Z <br /> 10 <br /> 1921 Ringwood Avenue • Son lose Colifornlo 95131 • Telephone 4081437-2400 • Fox 4081437-9356 <br />