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Map ID MAP FINDINGS Direction Distance EDR ID Number Elevation Site Database(s) EPA ID Number DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE SITE (Continued) 1000368504 Protection Agency (EPA), the Department of Toxic Substances Control (DTSC), and the Central Valley Regional Water Quality Control Board (CVRWQCB) agreed that it would be best to manage these underground storage tanks (USTs) in accordance with the California UST regulations. Consequently, closure of these tanks sites was deferred to the state program that manages closure of USTs. A total of 20 tanks have been closed to date. The remaining six tanks have only petroleum contamination and are in the process of being closed. Additional work has been planned under Sharpe's Stormwater Pollution Prevention Program. A sump with sludge containing high levels of metals and VOCs will be closed. This sump is located in the eastern portion of the Central Area. Closure will involve removal of the sludge and transportation to an appropriately permitted waste management facility, followed by capping stormwater connections to the sump. It has not yet been determined if the state will require that the sump be removed. Another project being conducted under Sharpe's Stormwater Pollution Prevention Plan involves the oxidation/evaporation pond. Elevated concentrations of metals will be removed from this site. Closure of the sump and the oxidation/evaporation pond will comply with all federal, state, and local laws. All Stormwater Pollution Prevention Program work will be completed outside the scope of CERCLA. All work associated with stormwater will be conducted under the oversight of CVRWQCB National Pollutant Discharge Elimination System (NPDES) Program. All studies and remedial action were conducted under a Federal Facilities Agreement between the U.S. Department of Defense (DOD), EPA, and the State of California. The RI/FS and Basewide Proposed Plan for Sharpe were released to the public on February 22, 1995. These two documents were made available to the public In the administrative record, located at Sharpe. A public comment period was held from February 22 to March 24, 1995. In addition, a public meeting was held on March 1 , 1995. SHARPE is located northeast of Lathrop, California, east of Interstate 5 and west of California Highway 99, with Roth and Lathrop Roads paralleling and contiguous to the north and south boundaries of the site, respectively. The South San Joaquin Irrigation District Canal (SSJIDC) parallels the eastern boundary. Land around Sharpe Is used for a variety of purposes including residential, agricultural, and light industry. Sharpe lies on slightly sloping to flat land. Elevations generally vary between 16 and 23 feel above mean sea level (fl-msi). Most of the surface water runoff is routed in drains leading to the stormwater sewer system and then Into the SSJIDC at the east side of the site. This canal discharges into French Camp Slough a few miles north of Sharpe. French Camp Slough discharges into the San Joaquin River, which flows into San Francisco Bay. No surface runoff occurs on the west boundary of Sharpe; surface water along this boundary drains Into sumps 5- to 15-feet (fl) deep located along the west fence line and is allowed to percolate. No discernible evidence exists to indicate faulting or geologic structures influence groundwater flow patterns. Groundwater flow along the western boundary of Sharpe Is generally northwestward. Two operable units (OUs) have been established to facilitate environmental cleanup at the Defense Distribution Depot San Joaquin-Sharpe Site (Sharpe Site), in Lathrop, California. OU 1 encompasses groundwater contaminated primarily with volatile organic compounds (VOCs), and OU 2 consists of contaminated soil and soil vapor above the water table. This decision document amends the Record of Decision, Basewide Remedy for DORW-Sharpe Site (OU 2 ROD), signed In February 1996, for sell sites at the Sharpe Site; it does not amend the Remedial Investigation/Feasibility Study at DDRW-Sharpe Site, Record of Decision, Operable Unit 1 (OU 1 ROD), signed in January 1993, for contaminated groundwater beneath and emanating from the Sharpe Site. A separate amendment to the OU 1 ROD is in preparation. The OU 2 ROD identified two types of sites requiring action: trichloroethene (TCE) sites and metals sites. This ROD amendment adds land use controls (LUCs) to eight TCE sites and five metals TC4755450.2s Page 20