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Chevron #9-4054 May 2014 2103 Country Club Boulevard, Stockton Claim No: 12729 ATTACHMENT 2: SUMMARY OF BASIC CASE INFORMATION (Conceptual Site Model) Site Location/History • This Site is located on the northwest corner of the intersection of Country Club Boulevard and Franklin Avenue and is a vacant lot. • The Site is bounded by residences to the north, businesses across Country Club Boulevard to the south, businesses to the west, and businesses across Franklin Avenue to the east. • Site maps showing the location of the former USTs, monitoring wells, groundwater level contours, and petroleum hydrocarbon constituent concentrations are provided at the end of this document (Arcadis, 2013). • Nature of Contaminants of Concern: Petroleum hydrocarbons only. • Source: UST system. • Date reported: March 1989. • Status of Release: USTs removed. Tank Information Tank No. Size in Contents Closed in Place/ Date Gallons Removed/Active 1 2,000 Gasoline Removed October 1988 2,3 4,000 Gasoline Removed October 1988 4,5 3,000 Gasoline Removed October 1988 6 550 Waste Oil Removed October 1988 Receptors • GW Basin: San Joaquin Valley— Eastern San Joaquin. • Beneficial Uses: Central Valley Regional Water Quality Control Board (Regional Water Board) Basin Plan lists agricultural, municipal, domestic, industrial service and process supply. • Land Use Designation: Aerial photograph available on GeoTracker indicates mixed residential and commercial land use in the vicinity of the Site. • Public Water System: Stockton East Water District and the California Water Service. • Distance to Nearest Supply Well: According to data available in GeoTracker, there are no public supply wells regulated by the California Department of Public Health within 1,000 feet of the Site. No other water supply wells were identified within 1,000 feet of the Site in the files reviewed. • Distance to Nearest Surface Water: There is no identified surface water within 1,000 feet of the Site. Geology/Hyd rogeology • Stratigraphy: The Site is underlain by interbedded and intermixed gravel, sand, silt, and clay. • Maximum Sample Depth: 110 feet below ground surface (bgs). • Minimum Groundwater Depth: 4.43 feet bgs at monitoring well MW-9. • Maximum Groundwater Depth: 23.41 feet bgs at monitoring well MW-4. • Current Average Depth to Groundwater: Approximately 11 feet bgs • Saturated Zones(s) Studied: Approximately, Zone A (6-35 feet bgs), Zone B (39-51.5 feet bgs), Zone C (65-80.5 feet bgs), and Zone D (95-101 feet bgs). • Appropriate Screen Interval: Yes. • Groundwater Flow Direction: Variable, north. Page 6 of 15