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Phase H Site Assessment Work Plan LOPEZ PROPERTY 1601 Turnpike Road, Stockton, California 1.0. INTRODUCTION At the request of Mr. Steve Dunn of Preston Pipelines, Inc., Advanced GeoEnvironmental, Inc. (AGE)has prepared this Phase II Site Assessment Site Assessment Work Plan for the property at 1601 Turnpike Road, Stockton, California(the site).The proposed work is being performed as part of a due diligence for a potential property transfer. 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 (SJCEHD) for the procurement of a soil boring permit. Appendix A - Staff Recommendations for Reporting at Contaminated Sites with Underground Storage Tank Releases (Final Draft), prepared by the Central Valley Regional Water Quality Control Board, was used as a guideline for the preparation of this work plan. 2.0. BACKGROUND The site is located near the intersection of Turnpike Road and Lincoln Street,in a mostly commercial area of south Stockton, San Joaquin County(Figure 2). The subject property was developed in the mid-1950s as "R. Goold and Sons" and utilized for electrical contracting from the mid-1950s through the mid-to-late 1980s.Historical occupancy directory listings show"Harbor Signs"occupied the property in the early 1990s, no occupants in 1994 and 1999 and the current owner, "Nereida Lopez"in 2003.The property is presently used as office space,an auto repair shop and an auto body shop. 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.