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Pack Car Wash March 2014 <br /> 4405 Pacific Avenue, Stockton <br /> Claim No: 12325 <br /> ATTACHMENT 2: SUMMARY OF BASIC CASE INFORMATION (Conceptual Site Model) <br /> Site Location/History <br /> • This Site is an active commercial petroleum fueling facility and car wash and is bounded by <br /> businesses to the west and north, residences across Pacific Avenue to the east, and <br /> businesses across West Bianchi Road to the south. <br /> • A Site map showing the location of the former USTs, monitoring wells, and groundwater level <br /> contours is provided at the end of this review summary (Advanced GeoEnvironmental, 2012). <br /> • Nature of Contaminants of Concern: Petroleum hydrocarbons only. <br /> • Source: UST system. <br /> • Date reported: May 1992. <br /> • Status of Release: USTs removed. <br /> Tank Information <br /> Tank No. Size in Contents Closed In Place/ Date <br /> Gallons Removed/Active <br /> 1-3 12,000 Gasoline Removed October 1991 <br /> 4 20,000 Gasoline Active <br /> Receptors <br /> • GW Basin: San Joaquin Valley— Eastern San Joaquin. <br /> • Beneficial Uses: Central Valley Regional Water Quality Control Board (Regional Water Board) <br /> Basin Plan lists agricultural, domestic, municipal, industrial service and process supply. <br /> • Land Use Designation: Aerial photograph available on GeoTracker indicates mixed residential <br /> and commercial land use in the vicinity of the Site. <br /> • Public Water System: Stockton East Water Department and the California Water Service. <br /> • Distance to Nearest Supply Well: According to data available in GeoTracker, there are no <br /> public supply wells regulated by the California Department of Public Health within 1,000 feet of <br /> the defined plume boundary. Reportedly, two domestic water supply wells lie within 1,000 feet <br /> of the defined plume boundary. One well is 250 feet east and the second well is 400 feet west <br /> of the Site. <br /> • Distance to Nearest Surface Water: There is no identified surface water within 1,000 feet of the <br /> defined plume boundary. <br /> Geology/Hydrogeology <br /> • Stratigraphy: The Site is underlain by interbedded and intermixed sand, silt, and clay. <br /> • Maximum Sample Depth: 105 feet below ground surface (bgs). <br /> • Minimum Groundwater Depth: 22.86 feet bgs at monitoring well MW-5. <br /> • Maximum Groundwater Depth: 36.62 feet bgs at monitoring well MW-12. <br /> • Current Average Depth to Groundwater: Approximately 26 feet bgs. <br /> • Saturated Zones(s) Studied: Approximately 13 - 126 feet bgs. <br /> • Appropriate Screen Interval: Yes. <br /> • Groundwater Flow Direction: Northeast with an average gradient of 0.001 feet/foot (July 2012). <br /> Page 7 of 15 <br />