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Record of Decision System (RODS)



City & State:  SAULT STE MARIE  MI  49783
EPA ID:  MID980678627
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Amendment
ROD ID:  EPA/AMD/R05-96/302
ROD Date:  09/27/1996
Operable Unit(s):  01
Media:  soil, sediment
Contaminant:  Metals, Chromium, Cadmium, Mercury, Arsenic
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 Cannelton Industries, Inc. (Cannelton) site is a 75-acre fenced site located on the shore of St. Mary's River, 1 mile upstream of the Soo Locks in Sault Ste. Marie, Michigan. The site was formerly a tannery, which operated from 1900 to 1958.

Most of the north part of the site is wetland and is located in the 100-year floodplain. The remaining areas of the site are not in the 100-year floodplain. There are approximately 400 single family residences located within one-half mile of the site boundary, the majority of which are south and west of the site. Primary land use surrounding the site is residential and light industrial. The tannery property is currently zoned for heavy industrial use. The twenty-year city master plan designated the majority of the property for general industry, with the exception of the area from 4th Avenue to South Street and from 18th Street to 16th Street, which has been projected as high density residential. There are no known endangered species; however, the wetlands and Tannery Bay are currently used by wildlife as habitat.

On September 30, 1992, the Environmental Protection Agency (EPA) signed a Record of Decision (ROD) for the final remedy at the site. The ROD required excavation of on-site soil and sediments from Tannery Bay where levels of contamination exceeded ROD cleanup standards; disposal in a cell to be constructed on site; collection and treatment of groundwater from the construction and dewatering activities; and groundwater monitoring and land use restrictions for landfilled areas.

After completion of pre-design studies and preliminary design, Cannelton requested that an alternate cleanup option for remediation of contaminated soil and sediments be considered. The alternate cleanup proposal consisted of excavation, dewatering, and disposal of tannery waste and soils from the area with highest contaminant concentrations, the Barren Zone, which is an off-site landfill; excavation and off-site disposal of surficial waste and debris from the western shoreline and of tannery waste from the southern shoreline of Tannery Bay; construction of a sheet pile containment system in Tannery Bay to prevent off-site migration and erosion of sediments; appropriate regrading and landscaping of the western shoreline and backfilling as necessary in the barren zone area to restore wetland and allow for natural revegetation; construction of a surface drainage system and maintenance of shoreline protection to prevent erosion; further evaluation of soil stability and a monitoring study to evaluate potential future release of metal into the environment; development and implementation of a long-term monitoring program for soils, surface water, and sediments; and implementation of deed restrictions to limit land use to industrial, recreational, and residential in certain specific areas of the site. As described in the amended Record of Decision (ROD), the Environmental Protection Agency (EPA) agreed with the proposed changes to the 1992 selected remedy.

In addition, Michigan passed a law that changed the environmental cleanup requirements and standards. These standards are based on different land use scenarios and the potential under each scenario. These standards also allow for the use of engineering and institutional controls to prevent adverse exposures. The amended remedy will be consistent with future land use of the property.

Groundwater, soil, and sediment data, collected as part of the pre-design investigations, along with major changes in Michigan's environmental cleanup standards, present significant opportunities for enhancement of the remedy with respect to future site uses and cost-effectiveness.
Remedy:  The major components of the selected remedy include: excavation and removal of contaminated soil and tannery waste down to clean sand from the Barren Zone, tannery waste from the southern shoreline of Tannery Bay, and surficial debris and waste materials from the western shoreline of the site to an off-site facility for appropriate disposal; collection and treatment of groundwater from construction/dewatering activities and discharge to the Publicly Owned Treatment Works (POTW), and if standards are met, the water can be discharged to the river; surface water, groundwater, sediment, wetland soils, and biological monitoring, including bioavailability studies for site specific metals (chromium, cadmium, mercury, arsenic, and lead); appropriate regrading and landscaping of the western shoreline and regrading and backfilling as necessary of the excavated area in the barren zone to restore wetland; construction of surface drainage works and maintenance or shoreline protection to prevent erosion; further evaluation of the stability of soils and sediments and a monitoring study to evaluate the potential for future releases or impacts of metals to the environment and evaluation of Tannery Bay, using appropriate analysis to determine if erosion of sediments and site materials are a concern; construction of a sheet pile containment system or other appropriate remedy for the Tannery Bay area if it is determined that erosion of sediment is a concern; modification of the amended remedy or the monitoring plan following assessment of the monitoring results; and site deed restrictions to limit future use to industrial or recreational uses in specific areas (consistent with wetland protection regulations), while permitting residential use of other portions of the site.
Text:  View full-text ROD [ 45K ]
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