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Additional Site Assessment and Monitoring Well Installation Work Plan PREM DOR 433 West Scotts Avenue, Stockton, California 1.0. INTRODUCTION At the request of Dr. Sonya Olbrantz,Advanced GeoEnvironmental, Inc. (AGE)has prepared this work plan for 433 W. Scotts Avenue, Stockton, California(site). The work plan provides the scope of work and procedures for the proposed advancement and abandonment of soil borings,installation and development of ground water monitoring wells and the collection and laboratory analysis of soil and ground water samples. The location of the site is illustrated on Figure 1. A current map of the site is shown on Figure 2. The work plan was prepared as required by the San Joaquin County Environmental Health Department(EHD),by letter dated 23 January 2003,to investigate the lateral and vertical extent of contamination at the site (Appendix A). The work plan was prepared in accordance with the California Regional Water Quality Control Board (CRWQCB) guidelines for the investigation of underground storage tanks (UST) sites. V 2.0. BACKGROUND The site is situated in an area of low topographic relief at an estimated elevation of 13 feet above sea level (Figure 1). The site location is West Scotts Avenue approximately 250 feet east of the intersection with Lincoln Street, in an industrial/commercial area of West Stockton; the petroleum hydrocarbon-impacted portion of the site is located on Lincoln street approximately 300 feet north of the intersection with West Scotts Avenue (Figure 2). The property is currently occupied by the Prem Dor Corporation. 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 �+ Advanced GeoEnvironmental,Inc. V