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1 <br /> Trace Analysis Laboratory, Inc. <br /> Telephone (510) 783-6960 <br /> 3423 Investment Boulevard #8 • Hayward, California 94545 Facsimile (510) 783-1512 <br /> LOG NUMBER: 3550 <br /> DATE SAMPLED 08/27/93 <br /> DATE RECEIVED 08/30/93 <br /> DATE ANALYZED 08/30/93 <br />' DATE REPORTED 09/14/93 <br /> CUSTOMER- Conoco, Inc. <br /> REQUESTER Lenard Long of Sunriver Engineering and Construction, Inc. <br />' PROJECT No 93036, Stockton <br /> Sample Type Vapor <br /> E-1 Method Blank <br />' Method and Concen- Reporting Concen- Reporting <br /> Constituent Units tration Limit tration Limit <br /> Modified DHS Method <br />' Total Petroleum Hydro- <br /> carbons as Gasoline mg/m3 ND 10 ND 10 <br /> Modified EPA Method 8020 for <br /> Benzene mg/m3 0 14 0 10 ND 0 10 <br />' Toluene mg/m3 0.12 0 10 ND 0 10 <br /> Ethylbenzene mg/m3 ND 0 10 ND 0. 10 <br /> Xylenes mg/m3 ND 0.30 ND 0 30 <br /> OC Summary <br />' q Recovery. 87* <br /> RPD. 3 1 <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 /> Founding Member of the Association of CaAfornra Testing Laboratories <br />