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.o File No. 1817-9 8 April 1988 Anderson Geotechnical Consultants has been retained by the Office of the State Architect to prepare a Leak Detection Plan for all underground fuel storage tanks at state-owned facilities located within a 16 county region of central California. The counties located within this region (OSA Region III) are Alpine, Amador, Colusa, Calaveras, E1 Dorado, Nevada, Mariposa, Merced, San Joaquin, Stanislaus, Sacramento, Placer, Yolo, Solano, Yuba, and Tuolomne. Our investigation has consisted of performing site visits to each of the involved facilities and collecting information required to recommend an appropriate Leak Detection plan for the tanks at each facility. SCOPE This package contains information specific to the tank(s) located at: Deuel Vocational Institution Department of Corrections 23500 Kasson Road, P.O. Box 400 Tracy CA 9537 Additionally, it contains a description of the Monitoring Alternatives, as specified in the Underground Storage Tank Regulations, that may be appropriate for use at this facility. We have noted which Monitoring Alternative we feel would be most applicable for use at this facility. GROUNDWATER INFORMATION The facility is located in the San Joaquin Valley Groundwater Basin. Groundwater in this area is and will be used in the future for multiple beneficial uses including domestic, industrial, or agricultural. There is one groundwater well that we are aware of located at the facility. The well is located approximately .2 miles south of the facility. We are not aware of any other groundwater wells within .5 miles of the facility. According to facility personnel the local groundwater table elevation varies between 3 and 6 feet below the ground surface. Groundwater elevations can be assumed to vary with time of year, rainfall pattern and other factors. The local ground surface is relatively flat -lying. The facility is underlain by valley floor sediments consisting of sand, silt, and clay.