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Trace Analysis Laboratory, Inc. Telephone (510) 783-6960 <br />' 3423 Investment Boulevard, #8 • Hayward California 94545 Facsimile (510) 783-1512 <br /> LOG NUMBER 3599 <br /> DATE SAMPLED 09/13/93 <br /> DATE RECEIVED 09/13/93 <br /> DATE ANALYZED 09/14/93 <br /> DATE REPORTED 09/27/93 <br /> CUSTOMER Conoco, Inc <br /> REQUESTER Lenard Long of Sunriver Engineering and Construction, Inc. <br />' PROJECT No. 93036, Stockton, 4325 East Washington Street, Stockton, CA <br />' Sample Type. Vapor <br /> I-1 Method Blank <br /> Method and Concen- Reporting Concen- Reporting <br /> tConstituent Units tration Limit tration Limit _ <br /> Modified DNS Method: <br />' Total Petroleum Hydro- <br /> carbons as Gasoline mg/m3 1,900 55 ND 10 <br /> Wodified EPA Method 8020 for: <br /> Benzene mg/m3 6.4 0 97 ND 0 10 <br />' Toluene mg/m3 30 0 89 NO 0. 10 <br /> Ethylbenzene mg/m3 51 2 6 ND 0 13 <br /> Xylenes mg/m3 520 2 5 NO 0 30 <br /> QC Summary <br />' % Recovery- 90* <br /> q RPD. 20 <br />' Concentrations reported as ND were not detected at or above the reporting limit. <br /> * The Recovery for vapor samples is based on the Laboratory Control Sample <br /> Louis W. Dupuis <br /> Quality Assurance/Quality Control Manager <br /> IFounding Member of the Association of California Testing Laboratories <br />