SITE INFORMATION AND CORRESPONDENCE

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I IPROPOSED PLAN CONTENTS 1 PROPOSED , Purpose of the Proposed Plan The purpose of this Proposed Plan for Amendments to the Sitewide Comprehensive Record of Decision is to give the public an opportunity Introduction 1 to review and comment on recommended changes to the previously published cleanup plans for certain contaminated sites located at Defense Distribution Depot San Joaquin California,Tracy Site Opportunities for (DDJC-Tracy). Community Involvement 1 Depot Background Figure 1: DDJC-Tracy is located in an unincorporated area in San Joaquin County, Location of DDJC-Tracy 1 southeast of the City of Tracy. Figure 1 shows DDJC-Tracy's regional location. Overview of the Proposed Plan 2-4 Since 1942,the federal Defense Logistics Agency has operated the site as a storage and distribution depot for the United States military Figure 2: services in the western U.S. and the Pacific region. From the 1940s The CERCLA Process at DDJC-Tracy 3 through the 1970s,potentially hazardous materials from various operations were buried,burned,or abandoned at numerous sites Figure 3: at the depot. National Contingency Plan Criteria 4 In 1984,environmental investigations revealed that previous on-base activities were likely to have contaminated the depot's soil and Figure 4: groundwater. In 1990,the depot was placed on the federal National Location of Remedial Action Sites 5 Priorities List,also known as the Superfund list. As a result,environ- mental activities at DDJC-Tracy are subject to the requirements of the Changes Proposed in Comprehensive Environmental Response,Compensation and the ROD Amendment 0-8 Liability Act(CERCLA),as amended by the Superfund Amendments and Reauthorization Act(SARA). Solid Waste Management Unit In 1991,DDJC-Tracy entered into an agreement,called a Federal Facilities (SWMU) 4 8-7 Agreement(FFA),with three regulatory oversight agencies:the U.S. Environmental Protection Agency(EPA),the State of California Operable Unit 1 (OU 1) 7-8 Department of Toxic Substances Control(DTSC),and the State of California Water Quality Control Board,Central Valley Region(RWQCB). The FFA requires DDJC-Tracy to conduct environmental studies and Defense Site Environmental 8 perform cleanup activities to protect the health and safety of the community Reporting and Tracking System and the environment. These activities follow a certain process,in accordance (DSERTS) 72 with federal and state requirements. As these activities are conducted, DDJC-Tracy works closely with the regulatory oversight agencies. Glossary of Terms 8-9 The environmental study and cleanup process requires the preparation of documents that: Mailing List Form g 1)report on the results of environmental investigations,and 2)spell out the remedial actions that will be taken to safeguard human For Further Information 10 health and the environment. These documents are available for public review at the Information Repository(IR)and Administrative Record(AR)located at DDJC-Tracy (see the back page for more information about the IR/AR). Key milestones in the CERCLA Process for DDJC-Tracy are shown in the Figure 2 timeline on page 3. continued on page 3 2