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21 December 1998 AGE-NC Project No. 98-0533 Page 2 of 5 located throughout the facility. 2.2. REGIONAL GROUND WATER DEPTH AND FLOW DIRECTION According to the map Lines of Equal Depth to Ground Water in Wells, Spring 1996,published by the San Joaquin County Flood Control and Water Conservation District, ground water depth in the vicinity of the site is between 70 and 80 feet bsg. However, significant recharge in the area over the past two wet seasons have likely decreased the ground water depth approximately 15 to 20 feet. Regional ground water flow direction is southwest; however, both ground water depth and flow direction at the site can vary seasonally. 3.0. SCOPE OF WORK The USTs are located between four structures and adjacent to a domestic water well. The northern UST is located partially under the adjacent hanger. Excavation of the USTs would likely result in damage to one or more of the adjacent structures. Furthermore, access is limited in the area of the USTs. Therefore, the USTs will be abandoned in place by filling with an inert substance (e.g., concrete). Soil probe borings will be advanced beneath ends, where accessible, or between the USTs. Soil and/or ground water samples will be collected from each probe boring and submitted to a state certified laboratory for analysis of petroleum hydrocarbons.Additional soil samples will be collected from beneath the piping area, either by probe boring advancement or hand-augering; piping sample locations will be designated by the PHS-EHD during field procedures. The subsurface investigation of petroleum hydrocarbons at the site will consist of the following tasks: • Permitting and pre-field work activities; • Soil sample collection and analysis and • Report preparation. Each of these tasks is described in more detail below. 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be obtained from the PHS-EHD. As required by PHS-EHD Advanced GeoEnvironmental,Inc.