SITE INFORMATION AND CORRESPONDENCE

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Continued from previous page • • Since the early 1970s, the Tracy site IRP highlights since 1986 include has greatly improved its waste the following: management procedures. Fewer wastes are generated, and all wastes A Remedial Investigation/ Feasibility are disposed of in compliance with Study (RI/FS) was initiated in 1986. 4the latest regulatory standards. The purpose of the RI/FS was to identify all sites where The depot is concerned about the contamination might be present, impacts of previous waste and to evaluate the techniques that management practices. In 1980,the could be used to clean up the depot installed groundwater contamination. monitoring wells and began sampling In 1989, a groundwater extraction the water flowing beneath the depot. and treatment system was In 1984, sample results showed that constructed to control the off-site certain chemicals called volatile movement of the contaminated organic compounds were present in portion of the groundwater. New Commander for DDJC. In the groundwater at concentrations In 1990, the depot started to monitor June 1998, a new Commander was above state action levels. These groundwater every quarter. assigned to the Defense Distribution compounds are believed to be Later in 1990,the U.S. Depot San Joaquin. Colonel John residues from cleaning solvents used Environmental Protection Agency A. Marx, U.S. Army, comes to DDJC at the depot until 1976. (USEPA) listed the depot as a from an assignment as Assistant Superfund site. Executive Director, Logistics Since the early 1970s, A Record of Decision (ROD) Engineering and Technical focusing on groundwater cleanup Programs at Headquarters, Defense the Tracy site has was signed in 1993. That same Logistics Agency, Fort Belvoir, greatly improved its year, a Comprehensive RI/FS was Virginia. E initiated to address all remaining waste management environmental issues at the depot. What's New with the Installation procedures. Fewer A new Comprehensive ROD Restoration IRP Pro ram 7 wastes are generated, authorizing additional cleanup for Program ( both soil and groundwater was and all wastes are signed in 1998 (see below). Environmental Cleanup Has a disposed of in Long History at the Tracy Depot. In addition, extensive soil boring and Before we present details about compliance with the soil gas testing has been conducted current environmental cleanup latest regulatory for many years at selected sites both activities at DDJC-Tracy, we would on and off the depot. like to bring you up to date by standards. providing a historical overview of the The Installation Restoration Program at depot's Installation Restoration Additional groundwater monitoring DDJC-Tracy now includes two Program (IRP). IRPs are used by the wells were installed in early 1985 to groundwater treatment systems and DoD to manage the restoration help determine where the 131 groundwater monitoring wells (cleanup) of contaminated sites at compounds came from and how located both on and off the depot military installations. they were moving through the property. groundwater. Samples from these The Tracy facility was constructed in wells showed that contaminated Comprehensive Record of Decision 1942. Waste products (including groundwater had moved beyond the (ROD) Provides Final Blueprint for petroleum products, cleaning depot's boundary in a northeasterly the IRP. The Comprehensive ROD is solvents, and other hazardous and direction. In 1993,the Army acquired an agreement between DDJC-Tracy non-hazardous materials) were the Tracy Annex, 461 acres of and the regulatory oversight agencies generated during past operations. farmland directly north of the on the steps that will be taken and Before the early 1970s, many wastes installation, so the contaminated techniques to be used to clean up were disposed of at the depot using groundwater beneath portions of this contaminated sites at the installation. techniques that were common property could be cleaned up. Unlike the earlier ROD,the industrial practices at the time (for Comprehensive ROD addresses soil example, burning, discharge to soils issues as well as groundwater issues. or drains, and burial).