Pacific Southwest, Region 9: Superfund
Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations
Sharpe Army Depot
EPA #: CA8210020832
State: California(CA)
County: San Joaquin
City: 1.5 miles east of Lathrop
Congressional District: 11
Other Names:
Bulletin Board
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Description and History
NPL Listing History
NPL Status: Final
Proposed Date: 10/15/84
Final Date: 07/22/87
Deleted Date:
The 724-acre Sharpe Army Depot site is a Defense Logistics Agency facility that has been involved in the storage, shipping, packaging, and maintenance of general supplies for the Department of Defense. Between 1941 and 1975, maintenance of aircraft, vehicles, industrial equipment, and medical equipment resulted in the generation of a variety of chemical wastes produced on site were disposed of in multiple locations, including the South Balloon Area, the Burning Pits Area, and the North Balloon Area. The wastes include sludge containing phenols, polychlorinated hydrocarbons, and used paints and solvents. Wastes have contaminated both soil and groundwater. All maintenance activities have ceased, and the waste areas no longer are used. The Depot employs approximately 1,200 people. The contaminated sole source aquifer supplies water to approximately 33,600 people within 3 miles of the facility. The San Joaquin River is 2 miles from the Depot.
Contaminants and Risks
Contaminated Media
- Groundwater
- Soil and Sludges
Groundwater and soil contain volatile organic compounds (VOCs) including trichloroethylene (TCE). Soil contains metals and pesticide contamination. People who accidentally ingest contaminated groundwater or come in direct contact with site contaminants may be at risk.
Investigation and Cleanup Activities
This site is being addressed in three stages: immediate actions and two long-term remedial phases focusing on cleanup of the entire site and groundwater cleanup.
Initial Actions
Immediate actions: The Army built an interim groundwater treatment system at the South Balloon Area. Extraction and treatment of groundwater to remove VOC began in early 1987. A second interim groundwater treatment system became operational in the North Balloon area in late 1990. A Removal Action for pesticides in soil has been completed.
Cleanup Ongoing
Entire Site: A final base-wide ROD was signed in March 1996. The Remedy included excavations and disposal of soils contaminated with metals and soil vapor extraction for several areas of VOC contaminated soils.
Cleanup Ongoing
Groundwater: The Record of Decision (ROD) for treatment of VOCs in GW was signed in 1993. The system is constructed and in operation. Cleanup is expected to continue for approximately 7 years from the present , based upon a 2011 Tracy Annual Monitoring Report.
The Sharpe Army 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.
Cleanup Results to Date
The 3 Groundwater extraction and treatment systems are constructed and operating effectively. A Removal Action was completed for a small area of pesticides contamination.
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.
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.
Contacts
EPA Site Manager
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
1-800-231-3075
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
State Contact
Sacramento Field Office
8800 Cal Center Drive
Sacramento, CA 95826-3200
PRP Contact
(Base Contact)
P.O. Box 960001
Stockton, CA 95296
Community Contact
Other Contacts
After Hours (Emergency Response)