Jump to main content or area navigation.

Contact Us

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

Bulletin Board

Links

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). Approximately 25,000 people live within three miles of the site. Water from a municipal well, which is within three miles of the site, is blended with water from other wells and from the Delta Mendota Canal to provide drinking water to approximately 28,600 people. A Record of Decision (ROD) was finalized in August 1993 which addresses three major VOCs in groundwater, i.e., TCE, PCE and DCE.

Top of page

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 may face health risks. Metals and pesticides in soils pose threats to the on-site workers and some ecological receptors in the stormwater/sewage ponds.

Top of page

Who is Involved

This site is being addressed through Federal actions.

Top of page

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.

Cleanup Ongoing

Groundwater: The Defense Logistics Agency has investigated groundwater contamination in the northern area of the facility. As part of this investigation, an interim groundwater pump and treat system was installed. A final cleanup remedy was selected for the groundwater in the summer of 1993. It was determined that the existing pump and treat system should be expanded to pump more water and thereby address contamination in the entire groundwater plume. Treatment of the groundwater will continue until established cleanup goals are met.

Remedy Selected

Entire Site: An investigation began in 1991 to determine the nature and extent of contamination throughout the site. Final cleanup remedies were selected for soil contamination in 1998. Some modifications to those remedies documented in a Record of Decision Amendment dated December 2003 and in an Explanation of Significant Difference dated September 2004.

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.

Top of page

Cleanup Results to Date

Pumping and treating contaminated groundwater has reduced threats at the Tracy Defense Depot site. Final remedies for soil contamination has been selected.

Top of page

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.


Online information about the PRPs for the site is not yet available.

Top of page

Documents and Reports


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

Top of page

Community Involvement

Public Meetings:

Top of page

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

Top of page

Contacts

EPA Site Manager
John Lucey
415-972-3145
Lucey.John@epamail.epa.gov
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
David Yogi
415-972-3350
1-800-231-3075
Yogi.David@epamail.epa.gov
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
(415) 947-8701
r9.info@epamail.epa.gov
State Contact
Chris Sherman
916-255-6576
CSherman@dtsc.ca.gov
Department of Toxic Substances Control
8800 Cal Center Drive
Sacramento, CA 95826-3200
PRP Contact
Maurice Benson
(209) 839-4065
Maurice.Benson@DLA.MIL
Defense Logistics Agency
P.O. Box 960001
Stockton, CA 95296
Community Contact
Other Contacts
After Hours (Emergency Response)
US EPA
(800) 424-8802

Top of page



Jump to main content.