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3.0 FIELD INVESTIGATIONS <br /> 1 Site Description <br /> The subject site is located on West Hammer Lane in Stockton, California (Figure 1). The site is <br /> currently operating as a retail gasoline station and mini market. The approximate locations of the <br /> existing onsite gasoline USTs and other pertinent site features are shown on Figure 2 <br /> .2 Soil Borings <br /> I <br /> ATC retained the services of Fisch Environmental of Valley Springs, California to advance six soil <br /> borings. The soil,boring investigation was performed on June 27, 2001. Underground Services Alert <br /> (USA) was notified of the proposed drilling activities to ensure that no utility lines were located within <br /> the immediate vicinity of the soil borings, and Cruz Brothers Sub-Surface Locators, Inc. of <br /> Sacramento, California provided a subsurface survey of utility lines and other buried objects in and <br /> borehole locations. Prior to performing the drilling activities, ATC obtained permits from' <br /> around the bar p g <br /> San Joaquin County and access agreements for adjacent properties. Copies of the approved San <br /> Joaquin County Public Health Services Application for Well/Pump Permits are included in Appendix <br /> A. Copies of the approved Site Access Agreements from Taco Bell and Burger King Property owners <br /> are included as Appendix B. <br /> Depth discrete groundwater samples were collected from the six soil borings, at four on-site <br /> and two <br /> off-site (Taco Bell and Burger King) locations, in order to confirm the concentrations of petroleum <br /> hydrocarbons in shallow and deep groundwater at and near the site. Five of the boring locations (SHP- <br /> tI through SHP-5) were within three feet of the existing groundwater monitoring wells MW-2, MW-3, <br /> and MW-5 located on-site, and MW-6, and MW-7, located at the adjacent Taco Bell property. One soil <br /> boring (SHP-6) was located to the east of the soil boring SB3, in the parking lot of the Burger King fast <br /> food restaurant. The soil borings were advanced to a total depth of approximately 14 feet to 24 feet <br /> bgs. Groundwater was encountered at depths ranging from approximately 8.6 to 15 feet bgs in the local <br /> upper aquifer and 23.5 feet in the local lower aquifer. The soil boring locations are shown on Figure <br /> 2. <br /> 1� otv­_­,i) MNTOP4)S 1srREPO RTM.IMIKti 0 <br />