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Pacific Southwest, Region 9: Superfund

Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

Tracy Defense Depot

EPA #: CA4971520834

State: California(CA)

County: San Joaquin

City: 1.5 miles southwest of Tracy

Congressional District: 11

Other Names: Defense Distribution Region West-Tracy

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Description and History

NPL Listing History

NPL Status: Final

Proposed Date: 07/14/89

Final Date: 08/30/90

Deleted Date:

The 448-acre Tracy Defense Depot site was an Army Supply Depot from 1942 to 1963 when it was turned over to the Defense Logistics Agency. Operations at the site include repacking leaking chemical containers, fumigating shipping materials, maintaining vehicles, painting, storing chemicals, preserving metal parts, operating chemical and photographic laboratories, storing and mixing pesticides, and storing and treating liquid and solid wastes. Liquid waste treatment and storage areas include an unpaved storage area, two unlined sewage effluent ponds, two abandoned sewage lagoons, two lined industrial wastewater ponds, an abandoned paint spraying/stripping rinse water pond, an abandoned trench where 150 drums of waste oil were buried, an unlined pond for holding stormwater, an abandoned pesticide disposal trench, an abandoned area where substantial amounts of formaldehyde were buried, and aboveground and underground waste tanks. Hazardous materials, including solvents, radioactive materials, medical supplies, and solid and liquid chemicals, were disposed of in three burn pits. Former solid waste treatment and storage areas included a fill area where food items were buried, a fill area where construction material was buried, and three impoundments where wastes containing mercury phosphate compounds were stored. Currently, all solid hazardous waste is hauled off site to federally-approved disposal facilities. The shallow aquifer below the site is contaminated with volatile organic compounds (VOCs) which are captured by a groundwater pump and treat system. Approximately 25,000 people live within three miles of the site. A Record of Decision (ROD) was finalized in August 1993 which addresses three major VOCs in groundwater, i.e., TCE, PCE and DCE.

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Contaminants and Risks

Contaminated Media
  • Groundwater
  • Soil and Sludges

Groundwater is contaminated with VOCs and pesticides. People who accidentally ingest or come into direct contact with contaminated groundwater could potentially face health risks. Metals and pesticides in soils could potentially pose threats to the on-site workers and some ecological receptors in the stormwater/sewage ponds.

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Who is Involved

This site is being addressed through Federal actions. In 1991, the United States Defense Logistics Agency (DLA) signed a Federal Facilities Agreement with USEPA and State of California Regulatory Agencies to conduct remedial investigations and response actions to address site contamination.

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Investigation and Cleanup Activities

This site is being addressed in two long-term remedial phases focusing on cleanup of the groundwater and the entire site.

Tracy Defense Depot is participating in the Installation Restoration Program, a specially funded program established by the Department of Defense (DOD) in 1978 to identify, investigate, and control the migration of hazardous contaminants at military and other DOD facilities.

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Cleanup Results to Date

Pumping and treating contaminated groundwater has reduced threats at the Tracy Defense Depot site and is on-going. Final remedies for soil contamination have been implemented and are on-going.

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Potentially Responsible Parties

Potentially responsible parties (PRPs) refers to companies that are potentially responsible for generating, transporting, or disposing of the hazardous waste found at the site.

The United States Defense Logistics Agency (DLA) is the PRP for the site.

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Documents and Reports

Show details for Records of DecisionRecords of Decision
Show details for Technical DocumentsTechnical Documents

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Community Involvement

Public Meetings:

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Public Information Repositories

The public information repositories for the site are at the following locations:

DDJC - Tracy, Building 1
25600 South Chrisman Road
Tracy, CA 95376-5000

The most complete collection of documents is the official EPA site file, maintained at the following location:

Superfund Records Center

Mail Stop SFD-7C

95 Hawthorne Street, Room 403

San Francisco, CA 94105

(415) 820-4700

Enter main lobby of 75 Hawthorne street, go to 4th floor of South Wing Annex.

Additional Links

ATSDR Public Health Assessment: http://www.atsdr.cdc.gov/hac/pha/pha.asp?docid=96&pg=3

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EPA Site Manager
NadiaHollan Burke
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
David Yogi
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
State Contact
Michael R. Darrett

Mark P. Bare


Department of Toxic Substances Control
8810 Cal Center Drive
Sacramento, CA 95826-3200

Central Valley Regional Water Quality Control Board
11020 Sun Center Drive
Suite 200
Rancho Cordova, CA
PRP Contact
James A. Paslak
Defense Logistics Agency
P.O. Box 960001
Stockton, CA 95296
Community Contact
Other Contacts
After Hours (Emergency Response)
(800) 424-8802

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