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Shockey Truck Stop - 2 - September 20f2` <br /> Claim No. 9384 i <br /> ATTACHMENT 1 <br /> SUMMARY OF BASIC SITE INFORMATION (Conceptual Site Model) <br /> Site Location/ History <br /> • The Site is located at 850 West Mildeo Road: in Ripon, California and is an inactive truck <br /> staging area and fueling facility:." <br /> • The Site is bounded by West Milgeo Road to the north, Highway 99 to the south, east <br /> and west. The surrounding land use commercial. } <br /> • In April 1994, soil contamination was identified during the removal of USTs. <br /> • To date, 11 monitoringwells have been installed and monitored regularly. <br /> • A Site map showing the location of the monitoring wells and groundwater level contours <br /> is provided at the end of this five year summary. <br /> Pollutant Source <br /> • Nature of Contaminants of Concern: Petroleum hydrocarbons only. <br /> • Source, Date reported, and Status of Release: UST system, 4 April 1994, USTs <br /> removed. <br /> • Free Phase Hydrocarbons: Yes. <br /> Geology/ Hydrogeology t t <br /> • Stratigraphy: The Site is underlain by interbedded and intermixed sand, silt and clay. <br /> • Maximum Sample Depth:,.,50 feet below ground surface (bgs). <br /> • Minimum Groundwater Depth:.,22.10 feet bgs at monitoring well MW7-2. ' <br /> • Maximum Groundwater Depth: 3.1.68 feet-bgs at monitoring well MW-11; <br /> • Current Average Depth to-Groundwater: 24,feet bgs. <br /> • Saturated Zones(s) Studied: 22 to 60 bgs. ._ <br /> • Groundwater Flow Direction: Variable, northerly at 0.002 feet per foot. <br /> Groundwater Trends: ' <br /> • This.Site has been monitored regularly since 1996. TPHd trends are shown below: <br /> r; Source area (MW-4) and Down gradient (MW-1 and MW-6). <br /> PETROLEUM HYDROCARBONS{TPH)AS DIESEL FUEL'&616)Results for MW4 ' <br /> 77 71' <br /> SAE+O$ <br /> .. 6 <br /> ' __7.2Er08 - <br /> ` <br /> .- - 800000 . 1 <br /> 5 800000 - �� � �- —•',— , <br /> p { d <br /> 400000- <br /> 20000 <br /> 00000 20000 <br /> ell <br /> wr.�+TOTAL.PETROLEUM HYDROCARBON$(TPH)ASAIE5EL FUEL{TPH0).4. bend, - y <br />