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Sarale Far"ms - 2 - September 2d_12 <br /> Claim No. 17509 <br /> ATTACHMENT 1 <br /> SUMMARY OF BASIC SITE INFORMATION (Conceptual Site Model) <br /> Site Location/ History <br /> • The Site is located at 15500 Clifton Court Road in Stockton, California and is an active <br /> agricultural facility. <br /> • The Site is bounded by agricultural fields to the east, west and south and Clifton Court <br /> Road to the north. The surrounding land use is mixed residential and agricultural. <br /> • In December 1992, soil contamination was identified during the removal of USTs. <br /> • To date, eleven monitoring wells have been installed and monitored regularly. <br /> • A Site.map showing the location of the former USTs, monitoring wells and groundwater <br /> concentrations is provided at the end of this five year summary. <br /> Pollutant Source <br /> • Nature of Contaminants of Concern: Petroleum hydrocarbons only: --• - - �v, -- - - <br /> •- Source, Date reported, and Status of Release: UST system, 31 December 1992, USTs: <br /> replaced. <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: 70 feet below ground surface (bgs). <br /> • 'Minimum Groundwater Depth: 1.91 feet bgs at monitoring well MW-3. <br /> -Maximum Groundwater Depth: -7.11 feet bgs at monitoring well MW-7. " <br /> • Current Average Depth to Groundwater: 5 feet bgs. <br /> • 'Saturated Zones(s) Studied: 5 to 55 bgs. i <br /> • Groundwater Flow Direction: Variable, north northeast at 0.001 feet per foot. <br /> Groundwater Trends: <br /> • This Site has been monitored regularly since 2003. Benzene trends are shown below: <br /> Source area (MW-1). . . <br /> 41 <br /> BENZENE Results for MW1 <br /> 4500 <br /> 4004 - <br />--.� <br /> .-.3000 – — } -- - N <br /> 2500 <br /> 2000 <br /> 5000 --� <br /> ,c"" if e� e <br /> . SENNE w Trend <br />