SITE INFORMATION AND CORRESPONDENCE

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Super Center Mart March 2014 701 East Charter Way, Stockton Claim No: 12741 ATTACHMENT 2: SUMMARY OF BASIC CASE INFORMATION (Conceptual Site Model) Site Location/History • This case is an active commercial petroleum fueling facility and is bounded by businesses including a former commercial petroleum fueling facility across South Stanislaus Street to the west, residences to the north, an active commercial petroleum fueling facility to the east, and businesses across East Charter Way to the south. • A Site map showing the location of the current and former USTs, monitoring wells, and groundwater contours is provided at the end of this review summary (Advanced GeoEnvironmental, 2014). • Nature of Contaminants of Concern: Petroleum hydrocarbons only. • Source: UST system. • Date reported: June 1997. • Status of Release: USTs removed. Tank Information Tank No. Size in Contents Closed in Place/ Date Gallons Removed/Active 1,2 12,000 Gasoline Removed February 1998 3 1,000 Gasoline Removed February 1998 ? ? Gasoline Active - Receptors • GW Basin: San Joaquin Valley— Eastern San Joaquin. • Beneficial Uses: 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 defined plume boundary. No other water supply wells were identified within 1,000 feet of the defined plume boundary in the files reviewed. • Distance to Nearest Surface Water: There is no identified surface water within 1,000 feet of the defined plume boundary. Geology/Hydrogeology • Stratigraphy: The Site is underlain by interbedded and intermixed sand, silt, clay, and gravel, with some cemented sand lenses. • Maximum Sample Depth: 150 feet below ground surface (bgs). • Minimum Groundwater Depth: 26.55 feet bgs at monitoring well MW-9C. • Maximum Groundwater Depth: 39.13 feet bgs at monitoring well MW-8D. • Current Average Depth to Groundwater: Approximately 23.5 feet bgs-c-- ti • Saturated Zones(s) Studied: Approximately 27 - 150 feet bgs. • Appropriate Screen Interval: Yes. • Groundwater Flow Direction: Predominantly northeast. Page 7 of 13