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' Trace Analysis Laboratory, Inc Telephone (510) 783-6960 <br /> 3423 Investment Boulevard, 48 Hayward California 94545 Facsimile (510) 783-1512 <br /> LOG NUMBER 4083 <br /> DATE SAMPLED 02/01/94 <br /> DATE RECEIVED 02/04/94 <br /> DATE ANALYZED 02/05/94 <br /> DATE REPORTED. 02/18/94 <br />' CUSTOMER. Conoco, Inc. <br /> REQUESTER Lenard Long of Sunriver Engineering and Construction, Inc. <br />' PROJECT. No. 93036, Washington Avenue, Stockton <br />' - - Sample Type: - Vapor <br /> I-1 Method Blank <br />' Method and Concen- Reporting Concen- Reporting <br /> Constituent Units tration Limit T tration Limit <br />' Modified DHS Method <br /> Total Petroleum Hydro- <br /> carbons as Gasoline mg/m3 1,600 510 NO 10 <br /> Modified EPA Method 8020 for <br /> Benzene mg/m3 4.9 1 5 ND 0 10 <br />' Toluene mg/m3 17 2 2 ND 0 10 <br /> Ethylbenzene mg/m3 110 1 6 NO 0 10 <br />' Xylenes mg/m3 1 ,200 4 3 ND 0 30 <br /> OC Summary <br />' q Recovery 107* <br /> % RPD 78 <br />' Concentrations reported as ND were not detected at or above the reporting limit <br />' * The Recovery for vapor samples 7s based on the Laboratory Control Sample <br /> Louis W DuPu1s <br />' Quality Assurance/Quality Control Manager <br />