Belvoir Ranch, Laramie County, WY: F. E. Warren Air Force Base Facility Former Atlas "D" Missile Site 4

Formerly Used Defense Sites (FUDS) Program

Published April 16, 2015
Atlas "D" missile site operated by the Air Force as part of the 564th Strategic Missile Squadron at F.E. Warren Air Force Base, Wyoming.

Atlas "D" missile site operated by the Air Force as part of the 564th Strategic Missile Squadron at F.E. Warren Air Force Base, Wyoming.

Location and Description: The property was one of three Atlas "D" missile sites operated by the Air Force as part of the 565th Strategic Missile Squadron at F.E. Warren Air Force Base, Wyoming. The property is located 20 miles west of Cheyenne, and consisted of 702 acres acquired by purchase and condemnation between 1959 and 1962. 

The property was excessed to the General Services Administration (GSA) in 1965. The 330 fee acres and easements over 34 acres that included the developed portion of the property were sold to Southern Scrap Iron and Metal Company, St. Louis, Missouri. This portion of the property was later sold to the Belvoir Grazing Association, Ault, Colorado. GSA sold the remaining portion of the property, which consisted of easements over 338 acres, to the Belvoir Grazing Association. The site is currently owned by the city of Cheyenne and the Cheyenne Board of Public Utilities. 

Problem and Response: Due to trichloroethene (TCE) groundwater contamination at the site, a Hazardous, Toxic and Radioactive Waste (HTRW) project was initiated under the Defense Environmental Restoration Program for FUDS. 

Remedial Investigation and Feasibility Study: The in-house remedial investigation (RI) report was finalized in 2006. The feasibility study (FS) was implemented in 2005 to consider remedial action alternatives (RAAs) for TCE contamination in the groundwater. The revised draft final FS report was submitted in November 2009. Supplemental investigations were conducted from 2007 to 2013 to fill data gaps from the RI and collect data to support the RAAs. Three years of interim monitoring of all monitoring wells, existing domestic, stock, industrial and municipal wells in the delineated portion of the contaminated groundwater plume were completed in 2010, 2011 and 2013 to assess plume stability. 

The interim monitoring continues on an annual basis for impacted wells and wells that are in proximity of the contaminated plume. In 2013, a contract action was awarded to conduct a data synthesis, evaluation and interpretation (DSEI) in an effort to extract and assess information from private wells and investigations conducted in the area by others to further define the conceptual site model. The DSEI study area was expanded in 2014 to include areas east and southeast of the original study area. The DSEI study is scheduled for completion in 2016, and will be used to assess and plan for any additional delineation and characterization work needed to complete the FS report.

Interim Removal Actions: An interim action was implemented in 2009 on two domestic supply wells with the installation of granular activated carbon treatment systems. A second interim action implemented in 2010 to design, construct, and operate a groundwater treatment facility at the Sherard Water Treatment Plant to provide treatment for the four impacted Cheyenne municipal wells in the Borie Wellfield has been completed. Both interim actions have been completed and continue to be monitored and operated by the U.S. Army Corps of Engineers. 

Activities for 2015: Restoration Advisory Board meetings will continue to provide community involvement and input on the evaluation and selection of the FS RAAs. The DSEI effort will continue, including conducting additional technical project planning meetings to address Wyoming Department of Environmental Quality (WDEQ)/stakeholder concerns and plan additional investigations to complete the FS. Award of a contract for the continuation of interim monitoring and operation of the residential wells/treatment facilities is planned. 

Proposed Activities for 2016: Review of data synthesis documents along with conducting technical project planning and Restoration Advisory Board meetings is planned to address WDEQ/stakeholder concerns prior to completion of the remedial investigation/feasibility study phase of the HTRW project. Monitoring and operations of the domestic and municipal treatment facilities is also planned. 

Issues and Other Information: Regulators and stakeholders believe the site is the source for TCE contamination in several municipal wells east of the site and look to the FUDS Program for treatment of the TCE contamination. In addition, WDEQ and EPA Region 8 are pushing for remedial action of the TCE-contaminated groundwater. There are also questions on an underground storage tank that may be eligible for removal with FUDS funding. The biggest challenge will be to satisfy the regulators’ concerns regarding remediation of TCE in the contaminated groundwater plume.