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Preliminary Site Assessment Work Plan Frank A. Moreno Trust 5279 East Cherokee Road, Stockton, California 1.0. INTRODUCTION At the request of the Frank A.Moreno Trust, Advanced GeoEnvironmental,Inc.(AGE)has prepared this Preliminary Site Assessment Work Plan for the property located at 5279 East Cherokee Road, Stockton, California. The location of the site is illustrated on Figure 1 -Location Map. A plan of the site is illustrated on Figure 2 -Site Plan. This Work Plan has been prepared as required by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) to obtain a permit for drilling. The objective of the investigation is to determine if hydrocarbon impact is present in the area of a former gasoline farm tank. This Work Plan provides a description of the scope of work and procedures to be used in soil probe borings, soil and groundwater sample collection and analysis, and soil boring abandonment. 2.0. BACKGROUND The site has operated as an agricultural farming facility for at least 50 years. Several structures, including a residence, a mobile home, a garage and storage facility and a warehouse are located on the property. Surrounding property is agricultural. 2.1. UNDERGROUND STORAGE TANK REMOVAL One 500-gallon gasoline underground storage tank(UST)was formerly located on the property. The UST was located at the north end of the garage/storage structure and was installed sometime during the 1950s. According to representatives of the Moreno Trust, the UST was removed from the site around 1990. The UST was exempt from permitting,due to it's farm tank status.No hydrocarbon odors were noted by representatives of the Moreno Trust and no soil samples were collected during UST removal. 2.2. GROUND WATER DEPTH AND FLOW DIRECTION Based upon the San Joaquin County Flood Control Map Lines of Equal Depth in Water Wells - 1996,ground water depth in the area of the site is approximately 70 to 80 feet below surface grade. Regional ground water flow in the area of the site is south-southeast. However, it is likely that flow direction at the site is influenced by agricultural pumping. Furthermore, flow direction varies seasonally throughout San Joaquin County. Advanced GeoEnvironmental,Inc.