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Record of Decision System (RODS)

HILL AIR FORCE BASE

Abstract

Site Name:  HILL AIR FORCE BASE
Address:  00-ALC/EM 
City & State:  HILL AFB  UT  84056
County:  DAVIS, WEBER
 
EPA ID:  UT0571724350
EPA Region:  08
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/198
ROD Date:  09/30/1997
Operable Unit(s):  08
 
Media:  Soil,groundwater
 
Contaminant:  Chlorinated solvents, non-chlorinated solvents, degreasers, petroleum, hydrocarbons, acids, bases, metals
 
Abstract:  Hill Air Force Base, Utah (Hill AFB) is located in northern Utah, about 25 miles north of Salt Lake City and about five miles south of Ogden, Utah in Weber and Davis counties. Hill AFB covers an area of about 6,700 acres on the Weber River Delta, a terrace that lies about 300 feet above the surrounding valleys.Most of the southern part of Hill AFB is occupied by industrial facilities, equipment storage areas, and administration buildings related to the aircraft maintenance mission of the Base. By contrast, the northern part of Hill AFB has large open areas with groups of buildings that were constructed as munitions manufacturing plants, assembly plants, or storage facilities. Although the use of the old facilities has changed in recent years to missile storage, maintenance, and testing, the building and facilities remain.In July 1987, Hill AFB was placed on the National Priorities List (NPL) to address sites where hazardous liquid and solid wastes generated by installation operations were disposed. These hazardous waste sites have been divided into nine operable units (OUs).Hill AFB has been the site of military activities since 1920, when the western portion of what is now the base was activated as the Ogden Arsenal, an Army Reserve Depot. In 1940 and 1941, four runways were built and the Ogden Air Depot was activated. During World War I and II, the Ogden Arsenal manufactured ammunition and was a distribution center for motorized equipment, artillery, and general ordnance. The Ogden Air Depot's primary operation was aircraft rehabilitation.On-base industrial processes in the OU 8 area associated with aircraft, missile, vehicle, and railroad engine maintenance and repair include metal plating, degreasing, paint stripping, and painting. These processes use numerous chemicals including chlorinated and non-chlorinated solvents and degreasers, petroleum hydrocarbons, acids, bases, and metals. In the past, chemicals and waste products were disposed of at the Industrial Wastewater Treatment Plant (IWTP), in chemical disposal pits and landfills off base. Disposal in chemical pits and landfills was discontinued by 1980. All waste products are currently treated at the IWTP, recycled on-base, or sent to off-base treatment or disposal facilities.
 
Remedy:  As OU 8 only includes groundwater, this action will only address contaminated groundwater. Contaminated soil in the OU 8 area is being addressed by other soils-only OUs (OUs 3 and 7). The selected remedy for an interim action at OU 8 addresses the potential future threat to human health and the environment by preventing the transport of contaminated groundwater to off-base locations where exposure may occur. This interim action is planned to be in operation until the final remedy for OU 8 is implemented. This area and other areas containing groundwater contamination at OU 8 will be addressed by the final remedy for OU 8. Major components include: contain contaminated groundwater that is in excess of the Maximum Containment Levels (MCLs) at the southern boundary of Hill AFB using a series of vertical extraction wells located in the vicinity of the South Gate area; and discharge groundwater to the North Davis County Sanitation District (NDCSD) sanitary sewer.
 
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