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Record of Decision System (RODS)



City & State:  CHEYENNE  WY  82005
County:  LARAMIE
EPA ID:  WY5571924179
EPA Region:  08
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R08-93/069
ROD Date:  12/30/1992
Operable Unit(s):  04
Media:  None
Contaminant:  None
Abstract:  The F.E. Warren Air Force Base site is part of a 5,866-acre active strategic air command Base located in Cheyenne, Wyoming. Land use in the area is predominantly residential and agricultural. The site contains 831 onsite residential housing units and personnel barracks. The site overlies a series of water-bearing formations known as the High Plains aquifer. Historically, the base has been utilized for a number of military functions, including calvary outpost, quartermaster depot, and since 1958, as an operation center for intercontinental ballistic missiles. From 1962 to 1986, approximately 5 gallons per day of waste battery acid were drained from the sinks in an onsite building into concrete lined pits, known as "acid dry wells." Prior to 1977, unneutralized acid was discharged to the system, but subsequently the acid was neutralized with baking soda or soda ash prior to disposal. In 1986, disposal of waste acid was discontinued, and the wells and associated structures were removed. Later that year, the Air Force removed 500 tons of contaminated soil for offsite disposal, filled the excavated areas with clean soil, and covered the areas with gravel. This ROD provides the first of seven remedial actions for this site and addresses the acid dry well area, as OU4. Future RODs will address the spill sites, facility ground water, landfills, fire protection and training areas, open burning and detonation areas, and firing ranges, as OUs 1, 2, 3, 5, 6, and 7, respectively. Results from the RI for OU4 indicated that actions taken by the Air Force in 1986 have effectively removed all contaminated soil from the acid dry well area and there are no current risks to human health and the environment; therefore, there are no contaminants of concern affecting this site. SELECTED REMEDIAL ACTION: The selected remedial action for this site is no further action, with ground water monitoring. Previous actions taken by the Air Force have effectively removed all current risks to human health and the environment from this site area. There are no present worth or O&M costs associated with this no action remedy. PERFORMANCE STANDARDS OR GOALS: Not applicable. INSTITUTIONAL CONTROLS: Not applicable.
Remedy:  The selected remedy for the Acid Dry Well (ADW) area is that no further remedial action is required. Ground-water monitoring will be continued, to confirm that sulfate is not leaching out of the soil into the ground water and to ensure that no unacceptable releases to the environment occur.

OU 4 is the first of seven operable units to be investigated under the FFA. The others are: OU 1 - Spill Sites; OU 2 - Facility Ground water; OU 3 - Landfills; OU 5 - Fire Protection Training Areas; OU 6 - Open Burning/Open Detonation Area; and OU 7 - Firing Range(s). All of the investigations are being conducted in accordance with the FFA. Ground water (OU 2) will be concluded when Records of Decision (RODs) have been prepared for all other operable units.
Text:  View full-text ROD [ 36K ]
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