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Harry's Auto Mart - 2 : September 2012. <br /> - Claim No. 15094 <br /> i <br /> ATTACHMENT 1 <br /> SUMMARY OF BASIC SITE INFORMATION (Conceptual Site Model) <br /> Site Location/ History <br /> - • The-Site-is located at-2662 North Wilson Way in Stockton, California and is an active <br /> auto maintenance facility. <br /> The Site is bounded by North Wilson Way to the northwest,North Sanguinetti Lane to <br /> the northeast and residences to the south: The surrounding land.use is mixed <br /> residential and commercial: ' <br /> • In June 1989, soil contamination was identified during the removal of USTs. <br /> • To date, eight monitoring wells have been installed and monitored regularly. <br /> • A Site map showing the location of the former USTs, monitoring wells and groundwater <br /> level contours is provided at the end-of this five year summary. f __ <br /> Pollutant Source <br /> • Nature of Contaminants of Concern: Petroleum hydrocarbons only. <br /> • Source, Date reported, and Status of Release:. UST system, 25 March 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: 110 feet below ground surface (bgs). <br /> • Minimum Groundwater Depth: 40.81 feet bgs at monitoring well MW-7. <br /> • Maximum Groundwater Depth: 63.51 feet bgs at monitoring well MW=1 D. <br /> • Current Average Depth to Groundwater: 42 feet bgs. <br /> • Saturated Zones(s) Studied: 40 to 100 bgs. <br /> • Groundwater Flow Direction: Variable, south at 0.001 feet per foot.. <br /> Groundwater Trends: <br /> • This Site has been monitored regularly since 2001. Benzene trends are shown below: <br /> Source area (MW-1 and MW-3) and Down gradient (MW-2). <br /> -- - ---•-• - -- ' B E E Results for MW1-� <br /> 35000 i ,) <br /> I <br /> 30000 <br /> y 5000 z <br /> 7 <br /> s , <br /> ,tis. �`�` °x`_ •`a�' ,$4�¢ ,pQ_: r'�, a� .a�' <br /> f. <br /> '? i[a::.'BENZENE �.r,Trend <br /> " <br />