DSHW-2024-009253

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Division of Waste Management and Radiation Control
OPERATION AND MAINTENANCE INSPECTION
INSPECTION REPORT FOR: Tooele Army Depot – North (TEADN) Tooele, Utah
DATE OF INSPECTION: October 8, 2024 FACILITY CONTACT: Tyson Erickson Environmental Protection Specialist
Tooele Army Depot
[phone] EPA ID #: UT3213820894
CURRENT NOTIFICATION: Generator, Storage by Permit, and
Transporter for Hazardous Waste (RCRA) TYPE OF INSPECTION: Operation and Maintenance Inspection (O&M)
PARTICIPANTS: Jasin Olsen, Inspection Leader, DWMRC Tyson Erickson, TEADN Troy Johnson, TEADN Logan Stapert, TEADN
Chris Holt, Brice Engineering
Ben Hockstad, Brice Engineering TIME IN/TIME OUT: 8:30 AM/11:00 AM
REPORT PREPARED BY: Jasin Olsen
WEATHER CONDITIONS: Overcast, approximately 50℉
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APPLICABLE REQUIREMENTS: RCRA Part B Permit and Post-Closure Permit, Utah Hazardous Waste Management
Rules, UAC-R315 Facility Background and Source of Groundwater Contamination
The Tooele Army Depot – North (TEADN) facility consists of 24,732 acres of federal land in
Tooele County, Utah. The facility is located about 35 miles southwest of Salt Lake City, and approximately two miles southwest of the town of Tooele, Utah. From 1942 until the mid-1990’s, one of TEADNs missions included servicing, rebuilding, and storing wheeled vehicles and power generation equipment used by the U.S. Army. These activities were carried out in the
former industrial/vehicle maintenance area, which is situated along the eastern margin of the
facility just south of State Route 112. In 1993, Congress included most of the industrial/vehicle maintenance area in the Base Realignment and Closure (BRAC) Program. Under BRAC, this parcel was formally transferred to the Tooele City Redevelopment Agency in December 1998. After a series of ownership changes, the BRAC property was acquired by the Ninigret Group in
2012 and is currently operated as a commercial business/industrial park consisting of
warehouses, machine shops, manufacturing facilities, and related buildings. TEADN currently serves as a storage site for war reserve and training ammunition. Historical operations at the TEADN industrial/vehicle maintenance area resulted in volatile
organic compounds (VOCs) impacting soil and groundwater at several source areas. The primary
contaminant of concern is the solvent trichloroethene (TCE), which was used in the service and repair of military vehicles and equipment. Past investigations have also identified tetrachloroethene (PCE) and carbon tetrachloride (CTC) in soil and groundwater. On the BRAC parcel, several separate source areas have been identified: Building 679, Building 615, Building
620, and the Old Industrial Waste Lagoon and associated ditches (including the former C
Avenue Outfall). Within the installation, the Former Sanitary Landfill and Industrial Waste Lagoon have also been identified as source areas. Historically, these sources were managed under multiple solid waste management units (SWMUs), which facilitated management and remediation of soil contamination. However, groundwater contamination originating from these
source areas has formed a single comingled plume that extends beyond the original sources. The
comingled plume is now managed under a single SWMU, SWMU-58, which includes: the Northeast Boundary (NEB) groundwater TCE plume (formerly SWMU-58), the main TCE plume (formerly SMWU-2), impacted groundwater beneath the Former Sanitary Landfill (formerly SWMU-12/15), and vadose zone VOC sources within the footprint of the plume that
continue to impact groundwater. The primary source of the NEB Plume is the Building 679
source area, while the remaining identified sources contribute to the Main Plume. In total, the entire comingled TCE plume encompasses approximately 5.5 square miles and is approximately 4 miles long at its longest point. The main TCE plume area is largely contained within the installation and extends a maximum of approximately 0.15 miles beyond the installation
boundary. The NEB portion of the plume extends approximately 1.4 miles beyond the
installation boundary. Scope of the O&M Inspection
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It was determined that the inspection would focus on the following aspects of the groundwater
monitoring system:

• Groundwater sample collection
• Groundwater monitoring well maintenance Groundwater Sample Collection Division of Waste Management and Radiation Control personnel requested to observe sampling at wells located at SWMU-58. Division personnel met Brice Engineering and TEADN personnel
at the badging office then mobilized to Monitoring Well C-13 and began collecting their samples. Samples were collected using the HydraSleeve no-purge sampling method. The Hydrasleeve sampler was placed in the middle of the well screen prior to the sampling event, or if there is insufficient water, the sampler is placed in the center of the water column within the well. Prior to collecting the Hydrasleeve sampler the static water level was measured and
recorded. The Hydrasleeves were retrieved, sample bottles were filled and placed in coolers with ice. Field parameters were collected using an In-Situ Aqua TROLL. The crew also collected samples from Monitoring Wells C-12 and C-38 in a similar manner. While onsite, the Division observed proper sampling techniques, proper decontamination of all
reusable downhole equipment, and proper sample handling. Groundwater Monitoring Well Inspections and Maintenance Monitoring well conditions were inspected during the O&M site visit. The wells were inspected
for the following items: a. condition of the above-ground casing b. condition of the cement apron and surface seal
c. well cap is in place and locked d. wells are accessible, visible and identified The above-ground casings overall appeared to be in good condition at the wells visited during the O&M inspection. All of the casings appeared to have been recently painted. The cement
aprons and surface seals were all in good condition. The wells were locked on the casings. All wells were accessible, visible, and easily identified. Summary
The findings of the O&M Inspection are summarized below.
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1. Groundwater sample collection was conducted in accordance with the Standard Operating Procedure BE-SOP-09 which is in the approved QAPP. Groundwater
samples should accurately represent aquifer groundwater.

2. Monitoring wells are well maintained.
Overall, TEADN is in groundwater monitoring compliance. It appears that proper groundwater
monitoring well sampling procedures are followed in accordance with Permit Condition V.A and the groundwater monitoring system is in good condition.
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Signature Date

November 19, 2024
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Figures
Figure 1. Collecting a sample from a Hydrasleeve sampler.
Figure 2. Monitoring Well C-12.
Figure 3. Monitoring Well C-12.
Figure 4. Monitoring Well C-38