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Record of Decision System (RODS)

TWIN CITIES AIR FORCE RESERVE BASE (SMALL ARMS RANGE LANDFILL)

Abstract

Site Name:  TWIN CITIES AIR FORCE RESERVE BASE (SMALL ARMS RANGE LANDFILL)
Address:  MINNEAPOLIS ST PAUL IAP 
City & State:  MINNEAPOLIS  MN  55450
County:  HENNEPIN
 
EPA ID:  MN8570024275
EPA Region:  05
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-92/192
ROD Date:  03/31/1992
Operable Unit(s):  01
 
Media:  Soil Ground Water
 
Contaminant:  VOCs Metals
 
Abstract:  SITE HISTORY/DESCRIPTION: The 2-acre Twin Cities AF Reserve (SAR Landfill) site is a former disposal area for U.S. Air Force (USAF) main Base refuse in Minneapolis, Hennepin County, Minnesota. Land use in the area consists of a Small Arms Range, Minneapolis-St. Paul International Airport, and Fort Snelling State Park. The site is within the 100-year flood plain of the Minnesota River, and a wetlands associated with the National Wildlife Refuge is located adjacent to the site. The Small Arms Range Landfill (SARL), acquired by the USAF in 1955, was used for disposal of main Base refuse from 1963 to 1972. Industrial wastes, which included paint sludge, paint filters, and leaded aviation gasoline sludge, were buried at the landfill. The SARL was closed in 1972. In 1982 and 1983, the state constructed a stormwater retention and settling pond, serving Interstate 494, in the eastern part of the landfill. The landfill overlies two aquifer systems that receive recharge from the stormwater retention areas. Additionally, the upper aquifer has been shown to be connected hydraulically to the MinnesotaRiver. In 1983, the site was identified as a hazardous waste site, and in 1987, was placed on the NPL list because of suspected contaminant release to ground water. Based on preliminary investigations VOCs, metals, and other organics were detected in the soils, surface water, and ground water. This ROD is the first and final action for the site and addresses remediation of the ground water. The primary contaminants of concern affecting the soil and ground water did not exceed ARARs and, therefore, are not considered a threat since access restrictions addressed in this ROD will be implemented at the site. The primary contaminants of concern affecting the soil and ground water are VOCs, including 2butanone and TCE; and metals, including arsenic and lead. PERFORMANCE STANDARDS OR GOALS: The remediation goal is to reduce the levels of contaminants in the ground water to below MCLs established under the SDWA and to ensure that contaminant levels do not exceed federal or state Water Quality Criteria for freshwater species or potential drinking water sources. The remediation will achieve a carcinogenic risk level within EPA's target range for acceptable excess carcinogenic risk of 10[-4] to 10[-6]. Chemical-specific ground water clean-up goals are based on SDWA MCLs or Minnesota RAL, including arsenic 10 ug/l (RAL); beryllium 1 ug/l (RAL); cadmium 4 ug/l (RAL); lead 15 ug/l (SDWA); nickel 70 ug/l (RAL); selenium 10 ug/l (RAL); TCE 5 ug/l (SDWA); and vanadium 20 ug/l (RAL). INSTITUTIONAL CONTROLS: Deed restrictions will be implemented to limit development of the site and future ground water usage if the property is relinquished by the USAF.
 
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes allowing contaminated ground water to naturally attenuate; maintaining the site; monitoring ground water and surface water; and implementing institutional controls, including deed restrictions, and site access restrictions, such as fencing. The estimated present worth cost for this remedial action is $737,000, whichincludes a present worth O&M cost of $684,000.
 
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