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t Preliminary Site Assessment Work Plan RIPON PACIFIC PRIDE 816 South Frontage Road, Ripon, California 1.0. INTRODUCTION At the request of Mr David Atwater of Van De Pol Enterprises,Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed preliminary site assessment work plan for 816 South Frontage Road, Ripon, Stockton, California (site). The scope of work includes the advancement of five soil borings for the collection of soil and ground water samples. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. The San Joaquin County Environmental Health Department (EHD) has directed by letter dated 17 October 2002 that a work plan be prepared to investigate the lateral and vertical extent of contamination at the site (Appendix A). This work plan has been prepared in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines forthe investigation of underground storage tanks (UST) sites. 2.0. BACKGROUND The site is on the corner of South Frontage road and Goodwin Road,in an industrial/commercial area of North Ripon (Figure 2). The site is situated in an area of low topographic relief at an estimated elevation of 55 feet above sea level (Figure 1). The property is currently occupied by the Ripon Pacific Pride. 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, respectively.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 valley(Olmsted and Davis, 1961);the site itself is located on unconsolidated and semi-consolidated alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Advanced GeoEnvi ron mental,Inc.