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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:  Record of Decision
ROD ID:  EPA/ROD/R05-92/220
ROD Date:  09/30/1992
Operable Unit(s):  01
Media:  Soil, Sediment, Debris.
Contaminant:  VOCs, (TCE, xylenes)), other organics (PAHs, PCBs, pesticides, phenols), metals (arsenic, chromium, lead), inorganics
Abstract:  SITE HISTORY/DESCRIPTION: The 75-acre Cannelton Industries site is a former tannery facility located in the Upper Peninsula of Michigan, in Sault Sainte Marie, Chippewa County. Land use in the area is predominantly residential and light industrial, with 400 single-family residences and an elementary school located within 1/2 mile of the site. Nearby residents and the school are connected to the City's municipal water system, the source of which is the Saint Marys River intake, 1 mile upstream of the Cannelton site. The Saint Marys River, which is used both as a drinking water source and for recreational purposes, is adjacent to the lower area of the site. Part of the site lies within the 100-year floodplain of the river, and several wetlands areas surround the site. Additionally, the site overlies two aquifers that are hydraulically connected. From 1900to 1958, Northwestern Leather Company operated a tannery facility onsite. The plant had no sewer system, and three drains discharged approximately 250,000 gallons per day of chemical waste to the Saint Marys River and adjacent wetlands. Discharge wastes from the tannery included metals, cyanide, sulfide, calcium carbonate, salts, formaldehydes, thinners, acids, and alcohols. The primary discharge area covers 4 acres along the river to the north of the former plant site. Of this, approximately 1 acre ("the barren zone") contains multi-colored soil and waste residues, has little vegetation, and has had reportedly spontaneous fires occur in the past. A second area along the river at the west end of the site was used as a dump site for barrels and "general" waste from the tannery. In 1958, the tannery was destroyed by a fire; since then, the property has remained unoccupied. EPA's removal program has been involved at the site on three different occasions. In 1988, they responded to recurring fires and excavated five trenches in the barren zone area. In 1989 and 1991, shoreline stabilization systems were developed around the site to prevent waste materials from eroding into the river a fence currently exists around the majority of the site. This ROD addresses a final remedy for onsite contaminated soil, sediment, and debris and will mitigate impacts to surface water and ground water through the containment of source materials. The primary contaminants of concern affecting the soil, sediment, and debris are VOCs, including TCE and xylenes; other organics, including PAHs, pesticides, phenols, and PCBs; metals, including arsenic, chromium, and lead; and inorganics. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil, sediment, and debris excavation standards are based on state direct human contact (DHC) standards and include cadmium 100 mg/kg (DHC); lead 400 mg/kg (DHC); arsenic 12.8 mg/kg (background); and carcinogenic PAHs 0.33 mg/kg (MDL). A chemical-specific excavation goal for chromium was established using back calculations based on a 10[-6] cancer risk level for hexavalent chromium and an HI of 1 for trivalent chromium, resulting in a clean-up standard of 5,300 mg/kg for trivalent chromium and 54 mg/kg for hexavalent chromium. INSTITUTIONAL CONTROLS: Institutional controls in the form of land use restrictions will be implemented at the site. If it is found that health-based drinking water standards are not met after removal of source materials, deed restrictions will be sought for ground water beneath the site so that no drinking water wells will be installed.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating, dredging, and dewatering debris, waste, soil, and sediment that exceed the cleanup criteria; placing these media in an onsite solid waste landfill, and closing the landfill in accordance with RCRA subtitle D, or more stringent state standards; filling in onsite excavated areas with clean soil to stabilize the shoreline; collecting ground water from the dewatering/construction activities and treating the water, if needed, prior to offsite discharge to POTW, or onsite discharge to surface water; conducting additional ecological studies; monitoring ground water and surface water; and implementing institutional controls to control land use, and potentially, deed restrictions to control ground water use. The estimated present worth cost for this remedial action is $19,700,000, whichincludes an annual O&M cost of $458,000 for years 0-1; $449,000 for years 2- 3; $579,000 for year 4; and $303,000 for years 5-30.
Text:  View full-text ROD [ 69K ]
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