North Post-Closure Permit: Tooele Army Depot

Tooele Army Depot Post Closure Permit (TEAD N) establishes requirements for the evaluation of releases of hazardous wastes or hazardous constituents; the development and implementation of corrective action; and the post-closure monitoring and maintenance of the implemented corrective action. This permit is currently not risk-based, but it is TEAD N’s intention to establish risk-based, alternative concentration limits for its contaminants in soils and groundwater in the near future. The permit was reissued on April 18, 2011.

Currently, there are 58 Solid Waste Management Units (SWMUs) at TEAD N, which are being investigated under the Corrective Action and Post-Closure permit. TEAD N is on the CERCLA National Priorities list and has entered into a Federal Facilities Agreement with EPA Region 8. Funding is also received via the Defense Environmental Restoration Account (DERA).

TEAD N is on the CERCLA National Priorities list and has entered into a Federal Facilities Agreement with EPA Region 8. Funding is also received via the Defense Environmental Restoration Account (DERA).

As a result of past disposal practices of spent industrial waste water into unlined ditches, groundwater underlying a large area of TEAD N has been contaminated with chlorinated solvents (TCA, TCE, 1,1-DCA, and carbon tetrachloride). Three distinct, chlorinated solvent plumes exist:

1. A main TCE plume, which originates at the now capped Industrial Wastewater Lagoon and associated ditches and extends to the north—this plume is currently being contained and treated by a groundwater treatment facility under the TEAD N post-closure/corrective action permit;
2. A secondary TCE plume, which originates at Building 679 in the transferred, BRAC industrial area. This plume has spread off-site (about 1.5 miles to the north of state highway 112). While the source (an oil-water separator) was removed in the fall of 2000, the exact extent of the off-site portion to the north of the northeastern TEAD N boundary is currently being determined. This secondary plume is not yet being treated, and recent investigations indicate that groundwater treatment system extraction wells (installed in 1994 to treat the main plume) appear not to exert any influence;
3. A tertiary carbon tetrachloride, TCE, TCA, and 1,1-DCA plume, which originates at the now closed landfill and various locations throughout the industrial area, and which appears to co-mingle with the main plume southwest of the IWL— a groundwater flow model path line analysis shows that this plume will eventually be treated by the groundwater treatment system. In contrast to the above plumes (1) and (2), sources here are diffuse and not easily identifiable, but are currently being investigated.

Both human health and ecological risks as well as the migration of groundwater for TEAD N’s SWMUs are currently under control.

A copy of the Environmental Indicators for Current Human Exposures Under Control and Migration of Contaminated Groundwater Under Control can be viewed online in PDF format.

TEAD Post-Closure Permit

• Title Page and Table of Contents
• Signature Page
• Module I—Standard Conditions
• Module II—General Conditions
• Module III—Post-Closure Care and use of Property
• Module IV—Industrial Waste Lagoon Post-Closure Care
• Module V—Groundwater Monitoring
• Module VI—Groundwater Corrective Action Program (General Conditions)
• Module VII—Groundwater Corrective Action Program (Caretaker Status)
• Module VIII—Groundwater Corrective Action Program (Contingency Operations)
• Module IX—Corrective Action for Solid Waste Management Units Schedule of Compliance
• Module X—RCRA/CERCLA Integration
• Appendix A—RCRA Facility Investigation (RFI)
• Appendix B—Corrective Measures Study and Implementation
• Attachment 1—Post Closure Monitoring, Inspection and Maintenance Plan for Solid Waste Management Units (SWMU)
  • Monitoring Well Location Maps
• Attachment 2—Chemical Data Quality Management Plan (CDQMP)
• Attachment 3—Groundwater Flow and Solute Transport Model
• Attachment 4—Completed RCRA Facility Investigations Reports
• Attachment 5—Federal Facilities Agreement
• Attachment 6—Contingency Plan
• Attachment 7—Decision Document Outline
• Attachment 8—Groundwater Management Area Map

Comments or Questions

Adam Wingate
awingate@utah.gov
(801) 536-0200