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Record of Decision System (RODS)



Address:  2495 E 117TH ST 
City & State:  DAKOTA COUNTY  MN  55075
County:  DAKOTA
EPA ID:  MND000245795
EPA Region:  05
NPL Status:  Deleted from the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-95/283
ROD Date:  09/28/1995
Operable Unit(s):  02
Media:  groundwater
Contaminant:  Benzene, 1,1-dichloroethane, 1,1-dichloroethylene, 1,2-dichloroprop vinyl chloride
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

The Pine Bend Sanitary Landfill (PBSL) site is located in northeast Dakota County, on the periphery of the Minneapolis/St. Paul metropolitan area in Inver Grove Heights, Minnesota. PBSL encompasses 255 acres and is an open operating mixed municipal solid waste facility. Crosby American Demolition Landfill (CADL) is located immediately north of PBSL. The two landfills were operated as separate landfills under separate ownership. CADL encompasses approximately 52 acres and ceased accepting waste in 1989 and is inactive. CADL and PBSL are connected hydrogeologically in the surficial aquifer.

The Minnesota Pollution Control Agency (MPCA) considers the two landfills as one site because data shows that the groundwater contamination plumes emanating from each landfill commingle east of their common border.

The PBSL site is bordered on the south by industrial areas, to the east by residential and industrial areas, to the north by residential areas, and to the west by pasture and residential areas. The Mississippi River is located approximately one mile to the east of the site.

The PBSL was first issued a permit to operate in 1971. Since then, it has operated as a sanitary landfill accepting mixed municipal solid waste (mmsw) and nonhazardous industrial waste. The CADL was issued a permit in 1970.

To address source control and groundwater contamination, the unlined portion of the Pine Bend Landfill is being covered in accordance with current Minnesota Solid Waste Rules. In addition to the landfill cover, the active landfill gas collection system operates to limit the migration of landfill gas, and secondly, has the benefit of removing substantial quantities of volatile organic compounds (VOCs) as demonstrated by the quantity and quality of condensate that is removed from the system.

Groundwater was the only medium found to be contaminated off site that could be attributed to the site. With the exception of benzene and chlorinated fluoromethanes, all of these substances identified may be related to the transformation of certain chemicals to vinyl chloride through both chemical and biological processes. These substances are found at locations both outside and within the boundaries of the site. The groundwater contamination is most likely the result of precipitation infiltrating through the permeable landfill cover material and coming in contact with the buried waste. Specific compounds may also result from the degradation of waste products.
Remedy:  Based on the findings of the Remedial Investigation and the Health and Ecological Risk Assessments, the continuation of action under Superfund is not necessary. The low potential for site impacts can be adequately addressed under the Minnesota Solid Waste Rules for landfills. The site is an open operation landfill permitted by the MPCA. The permit requires continued monitoring, long-term care and contingency actions.
Text:  View full-text ROD [ 41K ]
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