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Three B's Truck Plaza - 3 - • June 2012 <br /> Claim No. 12992 <br /> ATTACHMENT <br /> SUMMARY OF BASIC SITE INFORMATION (Conceptual Site Model) <br /> Site Location/ History <br /> • The site is located at 14749 North Thornton Road in Lodi, California and is an active <br /> truck fueling plaza. <br /> • The site is bound by an off-ramp to Interstate 5 to the west, an empty field to the north <br /> and south and North Thornton Road to the east. The area surrounding the site is mixed <br /> residential and commercial. <br /> • An unauthorized release was reported in December 1997. <br /> • Sixty monitoring wells have been installed and monitored regularly since 1999. <br /> • Site map showing the location of the site facilities, monitoring wells and groundwater <br /> level contours, is provided at the end of this summary. <br /> Pollutant Source <br /> • Nature of Contaminants of Concern: Petroleum hydrocarbons only <br /> • Source, Date reported, and Status of Release: UST system, 9 December 1997, USTs <br /> removed <br /> • Free Phase Hydrocarbons: None reported <br /> Geology/ Hydrogeology <br /> • Stratigraphy: The site is underlain by interbedded and intermixed sand, silt and clay. <br /> • Maximum Sample Depth: 35 feet below ground surface (bgs) <br /> • Minimum Groundwater Depth: 4.53 feet bgs at monitoring well MW-9A. <br /> • Maximum Groundwater Depth: 19.36 feet bgs at monitoring well MW-2. <br /> • Current Average Depth to Groundwater: 11 feet bgs <br /> • Appropriate Screen Interval: Yes <br /> • Saturated Zones(s) Studied: 5 to 150 bgs <br /> • Groundwater Flow Direction: Westerly at a gradient of 0.002 (July 2011) <br />