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Record of Decision System (RODS)

OLMSTED COUNTY SANITARY LANDFILL

Abstract

Site Name:  OLMSTED COUNTY SANITARY LANDFILL
Address:  1MI EAST HWY 52 1/2MI NORTH HWY 154 
City & State:  ORONOCO  MN  55960
County:  OLMSTED
 
EPA ID:  MND000874354
EPA Region:  05
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-94/252
ROD Date:  06/21/1994
Operable Unit(s):  01
 
Media:  Groundwater
 
Contaminant:  VOCs
 
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 Olmsted County Sanitary Landfill site encompasses 304 acres and is located in Oronoco Township, Olmsted County, Minnesota. It is located approximately three miles north of the corporate limits of the city of Rochester in southeastern Minnesota. The site is gently rolling and vegetated. The land use in the vicinity is generally small farms, and rural areas. The upper aquifer in the area is the Prairie du Chien; the deeper sandstone aquifer is the Jordan. The site was used between 1970 and 1993 and is currently inactive. The main fill area is located on the northern one-third of the site and encompasses approximately 52 acres.

The site was operated by the city of Rochester from February 1970 until 1983. At that time, the city transferred ownership of the site to the county. The site remained operable until March 1993. It accepted mixed municipal solid waste, as well as commercial and industrial solid waste until March 1987, when it closed to all but demolition debris and ash.

In May 1983, groundwater samples from monitoring wells on the site indicated the presence of volatile organic compounds in the groundwater beneath the site. In May 1989, the county initiated a dye trace investigation to better determine the groundwater flow direction and travel time. In July 1989, the Minnesota Pollution Control Agency issued a Request for Response Action to the city of Rochester and Olmstead County for an RI/FS of the site. After the RI was concluded in July 1992, it was determined that additional field work was needed to examine gas migration at the site. After the supplemental RI was completed, it was concluded that a FS would not be necessary due to the low level of risk posed by the site.

This ROD for OU1 primarily addresses the main fill area and the ground water and gas migration in the vicinity.

This is a No Action ROD.
 
Remedy:  The selected remedial actions for this site include no further action. No further action is necessary because source control action taken under site closure and actions implemented under the Closure Order by Consent between Minnesota Pollution Control Agency (MPCA) and Olmsted County have eliminated potential exposure to source related contaminants.
 
Text:  View full-text ROD [ 32K ]
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