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i <br /> ENVIRONME-NTAL HEALT1t <br /> PEt t"IT S±=RVICE <br /> 95 JAN 13 PM 2: 04 <br /> TETRA TECH, INC. <br /> 670 North Rosemead Boulevard <br /> Pasadena,California 91107 <br /> Telephone(818)449-6400 <br /> January 9, 1995 <br /> Mr. Steve Sasson <br /> San Joaquin County Public Health Services <br /> Department of Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> RE: Transmittal of Revised Technical Work Plan - Hydropunch and Sampling Program <br /> Castle Rock Fire Station, 34580 Corral Hollow, Tracy CA <br /> Site Code: 1900 <br /> Dear Mr. Sasson: <br /> Pursuant to our December 20, 1994 phone conversation, Tetra Tech has prepared a revised <br /> technical work plan to comply with San Joaquin County Department of Environmental Health <br /> requirements for closure of the former 550-gallon diesel underground storage tanks at the above- <br /> referenced location. Two copies of the work plan are enclosed for your review. <br /> Per your direction, the proposed scope of work has been reduced to consist of a single soil <br /> boring to be located at the midpoint of the former tank cavity. Since depth to first groundwater <br /> has been documented at shallow levels, the boring will extend to the depth of groundwater to <br /> allow hydropunching and collection of one grab groundwater sample. The data will be used to <br /> determine if petroleum hydrocarbons from the tank have impacted groundwater. <br /> As we discussed, we are evaluating the possibility of sampling the nearby Livermore National <br /> Laboratories monitoring wells. Tetra Tech has contacted Livermore's environmental consultant <br /> to obtain analytical data from the wells. The data will be reviewed to determine if groundwater <br /> sampling of the wells is necessary. <br />