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UST Closure Report 9 9 Sharpe Defense Distribution Region West Lathrop,California Pate 1 1.0 INTRODUCTION This report presents the results of the underground storage tank(UST) removal project conducted at the Defense Distribution Region West, Sharpe site in Lathrop, California. The Sharpe site is just south of the city of Stockton and just east of Interstate 5 (Figure 1). The project was conducted on behalf of the US Army Corps of Engineers in accordance with Contract Number DACA05-97-D-0014, Task Order 0011, dated May 21, 1998. The project comprised the removal and disposal of eight USTs, dispensers and associated piping from the northeast corner of the intersection of F Street and 3rd Avenue on the Depot (Figure 2). CAL INC installed two new above ground storage tanks for gasoline and diesel fuel prior to removing the USTs to provide an uninterrupted supply of fuel. The new tanks were installed on the Depot in late 1998, just northwest of the intersection of Holly Street and 1st Avenue (Figure 2). 1.1 Purpose and Scope of Work The primary objective of the project was to remove and dispose of eight USTs and associated AOL piping. The USTs included four 20,000-gallon tanks, three 12,000-gallon tanks and one 550- gallon tank. Soil samples were collected from the UST excavations and stockpiles of excavated soil and analyzed for various parameters in accordance with the closure requirements of the San Joaquin County Environmental Health Division and the Tri-Regional Guidelines. The scope of the UST removal projected comprised the following: • Obtaining state, regional, and local regulatory agency permits; • Preparing and submitting a work plan for approval to the regulatory agencies; • Locating underground utilities in the area of excavation; • Cutting, removing and disposing of concrete dispenser islands and drive pads where necessary; • Dismantling and removing eight fuel dispensers; • Removing four 20,000-gallon, three 12,000-gallon and one 550-gallon USTs, associated piping and product pumps for diesel fuel and unleaded gasoline; • Disposing of the eight USTs and eight dispensers at a certified hazardous waste facility; • Environmental sampling to determine potential impacts on soil and groundwater; and • Restoring the site with compacted backfill. 1.2 Report Organization The remainder of this report is organized into the following sections: • Site description and background; • Field activities; NAPR0JECTS\3546\Reports\3546 UST Closure Report Draft.doc March 24,1999