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t Limited Subsurface Site Assessment Work Plan DELTA COLLEGE CATERPILLAR CENTER (SHIMA) 5151 Pacific Avenue, Stockton, California 1.0. INTRODUCTION At the request of Mr. Dwayne G. McAllister of Stockton Environmental, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Limited Subsurface Site Assessment Work Plan for the property at 5151 Pacific Avenue, Stockton, California (site). The work is being performed as part of due diligence effort to investigate areas of potential environmental concern at the site prior to demolition and construction activities. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan was prepared as required by the San Joaquin County Environmental Health Department(EHD)for the procurement of soil boring permits and uses the Central Valley Regional Water Quality Control Board document Appendix A-Tri-Regional Board StaffRecommendationsfor Preliminary Investigation and Evaluation of Underground Storage Tank Sites as a guideline. 2.0. BACKGROUND The subject area under investigation is the Agricultural and Natural Resource Yard/Shima Center, located at San Joaquin Delta College, 5151 Pacific Avenue, Stockton, California. It is AGE's understanding that the subject area will be demolished for new construction. The subject area is comprised of a shop/Caterpillar repair facility, an above-ground storage tank (AST), several agricultural buildings, and classroom area.A clarifier is reportedly present in the north west corner of the subject area. During a site visit of the subject area with representatives of Stockton Environmental, one mechanics pit was identified within the primary shop building. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough; the northern and southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, The Province is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. The Great Valley has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley. The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental-derived sediments were primarily deposited in lacustrine, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the Advanced GeoEnvironmental,Inc.