Environmental Engineering and Remediation
Remedial Design and Remediation

Resource Conservation and Recovery Act (RCRA) Support and Compliance Activities, Munitions Treatment Range (MTR)

Marine Corps Air Station (MCAS) Yuma, AZ

As part of this contract, GCE performed work required to ensure compliance with regulations associated with the Marine Corps Air Station (MCAS) Yuma Resource Conservation and Recovery Act (RCRA) permit for their Hazardous Waste Treatment Facility, commonly known as the MTR. Compliance activities included, completion of annual soil sampling, quarterly groundwater sampling and RCRA training in accordance with permit requirements. GCE also completed a renewal of the hazardous waste permit in accordance with State requirements. The permit renewal included preparation of multiple Sampling and Analysis Plans and an Accident Prevention Plan.

In addition to general RCRA Compliance activities, the scope of work for this contract required that GCE provide expedited/emergency response actions at MCAS Yuma facilities. Specifically, this contract contained several options that were utilized to: investigate and close a solid waste management unit (SWMU 11) on the Barry M. Goldwater Range; conduct an investigation and remediation of a munitions disposal area found during construction activities at MCAS Yuma; and complete excavation activities at a water treatment plant chemical spill site.

The scope of the project included:

  • RCRA Permit Compliance Activities. The MTR is used for open detonation of fragment, non-fragment, and white phosphorous military munitions. Soil and groundwater sampling were conducted in accordance with the facility's RCRA Permit. GCE installed a single groundwater monitoring well downgradient of the MTR and performed quarterly groundwater sampling at MTR as part of the RCRA compliance activities. Soil Sampling annually around the detonation pit(s) used for the demilitarization of military munitions and prior to backfilling the pits. The number and locations of the soil sample(s) were chosen based on the location of the detonation pit(s). A Quarterly Monitoring Reporting was prepared to document the results of the quarterly groundwater sampling and the soil sampling when performed.
  • SWMU 11 Investigation and Closure. SWMU 11 was identified in a RCRA Facility Assessment for the Barry M. Goldwater Range by the Arizona Department of Environmental Quality (ADEQ). GCE was contacted by MCAS Yuma Environmental Office to facilitate the closure of the site by reviewing historic sampling data and collecting new data to determine whether the SWMU was eligible for clean closure. GCE conducted soil sampling at the site which include five soil borings to a depth of 30 feet below ground surface. GCE evaluated the laboratory analytical results of the soil sampling, coordinated with ADEQ, and prepared the site documentation. All sample concentrations were below Arizona Soil Remediation Levels (SRLs) demonstrating that there was no risk to human health or the environment. ADEQ approved the clean closure of SWMU 11.
  • O'Neill Road Munitions Removal. As part of the F-35 Joint Strike Fighter (JSF) program at MCAS Yuma, O'Neill Road was extended to accommodate the construction of six new hangars. During grading operations, an undocumented munitions disposal area was located. GCE was contacted to provide emergency response characterization, excavation and disposal of contaminated soil and burnt munitions. Approximately 150 cubic yards of contaminated soil were excavated, characterized, and transported for disposal. Confirmation sampling was conducted to validate that excavation activities had effectively remediated the site. The site was quickly returned to the contractor to meet the aggressive schedule for the JSF hangars.
  • Potassium Permanganate Cleanup. As part of ongoing water treatment activities at the MCAS Yuma water treatment plant, potassium permanganate was improperly drained into the soil surrounding the site over an extended period. The MCAS Yuma Environmental Department estimated that approximately 300 gallons of potassium permanganate were released into the surrounding soil. This project was completed as an expedited response action due to the potential for exposure at an adjacent children's playground. GCE was contacted to excavate the impacted soil, perform soil sampling to confirm removal of all contaminated soil, perform waste characterization sampling for disposal of excavated materials, and backfill the site. GCE completed this expedited response action, including mobilization, sampling, and reporting in one week.