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File No. 1817-9 <br />28 December 1987 <br />INTRODUCTION <br />Anderson Geotechnical Consultants has been retained by the Office <br />of the State Architect to prepare a Leak Detection Plan for all <br />underground fuel storage tanks at state-owned facilities located <br />within a 16 county region of central California. The counties <br />located within this region (OSA Region III) are Alpine, Amador, <br />Colusa, Calaveras, E1 Dorado, Nevada, Mariposa, Merced, qan <br />Joacuin, Stanislaus, Sacramento, Placer, Yolo, Solano, Yuba, and <br />Tuolomne. Our investigation has consisted of performing site <br />visits to each of the involved facilities and collecting <br />information required to recommend an appropriate Leak Detection <br />plan for the tanks at each facility. <br />SCOPE <br />This package contains information specific to the tank(s) located <br />at: <br />California Highway Patrol - Tracy <br />State of California <br />305 West Grantline Road <br />Tracy CA 95376 <br />Additionally, it contains a description of the Monitoring <br />Alternatives, as specified in the Underground Storage Tank <br />Regulations, that may be appropriate for use at this facility. <br />We have noted which Monitoring Alternative we feel would be most <br />applicable for use at this facility. We would appreciate your <br />review of the Monitoring Alternatives and information contained <br />in this package. If you agree with our preferred Monitoring <br />Alternative, please indicate so on the enclosed sign -off sheet. <br />GROUNDWATER INFORMATION <br />The facility is located in the San Joaquin Valley groundwater <br />basin. Groundwater in this area is and will be used in the <br />future for multiple beneficial uses including domestic, <br />industrial, or agricultural. There is one groundwater well <br />located approximately .3 miles southwest of the facility. We are <br />not aware of any other groundwater wells within .5 miles of the <br />facility. The local groundwater table elevation varies between 6 <br />and 10 feet below the ground surface. The groundwater gradient <br />is not known, however, the direction is probably toward the <br />northwest. Groundwater elevation varies with time of year, <br />rainfall pattern and other factors. <br />