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Three Palms Grocery - 2 - July 2012 <br /> Claim No. 13455 <br /> ATTACHMENT 1 <br /> SUMMARY OF BASIC SITE INFORMATION (Conceptual Site Model) <br /> Site Location/ History <br /> • The Site is located at 6732 East HWY 88 in Stockton, California and is an active grocery <br /> store. <br /> • The Site is bound by Waterloo Road to the northwest, East Fairchild Road to the <br /> southwest and agricultural fields to the northeast and southeast. The area surrounding <br /> the site is mixed residential, commercial and agricultural. <br /> • An unauthorized release was reported in February 1998. Five monitoring wells have <br /> been installed and monitored. <br /> Pollutant Source <br /> • Nature of Contaminants of Concern: Petroleum hydrocarbons only <br /> • Source, Date reported, and Status of Release: UST system, 17 February 1998, USTs <br /> removed <br /> • Free Phase Hydrocarbons: None reported <br /> Geology/ Hydrogeology <br /> • Stratigraphy: The Site is underlain by interbedded and intermixed gravel, sand, silt and <br /> clay. <br /> • Maximum Sample Depth: 140 feet below ground surface (bgs) <br /> • Minimum Groundwater Depth: 82.06 feet bgs at monitoring well MW-2 <br /> • Maximum Groundwater Depth: 98.28 feet bgs at monitoring well MW-4 <br /> • Current Average Depth to Groundwater: 90 feet bgs <br /> • Saturated Zones(s) Studied: 85 to 130 bgs <br /> • Groundwater Flow Direction: Variable; northeast at a gradient from 0.0005 and 0.0121 <br /> feet per foot <br /> Groundwater Trends: <br /> This Site has been monitored regularly since 1999. 1,2 DCA trends are shown below, source <br /> area (MW-1) <br /> 1,2-DICHLOROETHANE Results for MW1 <br /> as <br /> 40 <br /> 30 <br /> 25 <br /> 20 / <br /> 15 <br /> 10 <br /> 0 d <br /> .a <br /> 1,2-OICHLOROETHAME --- Trend <br />