Site Name: ALSCO ANACONDA
EPA ID: OHD057243610 EPA Region: 05 Metro Statistical Area:
ONE ANACONDA DR, GNADENHUTTEN, OH 44629
Operable Unit: 02
ROD ID: EPA/ROD/R05-92/214 ROD Date: 09/30/92
Contaminant: Organics Metals
Keys: Carcinogenic Compounds; Chromium; Clean Water Act; Direct Contact; Floodplain; Ground Water; Ground Water Monitoring; Inorganics; Institutional Controls; Lead; MCLs; Metals; O&M; Onsite Discharge; Organics; PCBS; RCRA; Safe Drinking Water Act; Sediment; State Standards/Regulations; Wetlands.
Abstract:
SITE HISTORY/DESCRIPTION: The 4.8-acre Alsco Anaconda site is located in Gnadenhutten, Tuscarawas County, Ohio, within the 50- and 100- year floodplains of the Tuscarawas River. It consists of four source areas which contained F019 waste (wastewater treatment sludge) generated by the adjacent aluminum products manufacturing facility. Land use in the general area of the site is mixed industrial, recreational, and residential. Several municipal, industrial, and residential wells are located within a 1.5 mile radius of the site; however, contaminated site ground water flows towards and into the Tuscarawas River where it discharges at concentrations below any regulatory levels. Site ground water is not used as draining water. Aluminum products have been produced at neighboring manufacturing facility since 1945 when it was incorporated as Alsco, Inc. From 1965 through 1978, contamination at the Alsco Anaconda site occurred when wastewater and wastewater treatment sludge (F019) from the aluminum plant were disposed of in an unlined settling basin (which consisted of two impoundments) and a sludge pit. The F019 waste contained hazardous constituents such as cyanide and chromium. As a result of overflow from the settling basin and plant wastewater treatment discharge, sludge also became located in a wooded area between the settling basin and the river. The total volume of sludge and contaminated soil excavated from the source areas to date is approximately 45,000 tons. A 1989 ROD addressed the Source Material Operable Unit, which involved the excavation and offsite treatment and disposal of the contaminated sludge and soil, incineration of a small amount of material containing high levels of PCBs, and backfilling and revegetating excavated areas of the site. Most of this work has been completed during 1992. This ROD addresses the contaminated ground water and sediment which constitute the second operable unit at the site. The primary contaminants of concern affecting the ground water include organics such as cyanide, fluoride, PCBs; and bis(2ethylhexyl) phthalate; and metals, including chromium and lead. PERFORMANCE STANDARDS OR GOALS: Chemical- specific ground water clean-up levels include the following, which are SDWA MCLs or proposed MCLs; chromium 0.1 mg/l; cyanide 0.2 mg/l; fluoride 4 mg/l; and bis (2-ethylhexyl) phthalate 0.004 mg/l. Lead levels will meet an action level of 0.015 mg/l. Clean-up below background levels will not be required. INSTITUTIONAL CONTROLS: Institutional controls, including deed restrictions, will be implemented to prevent installation of drinking water wells within the site boundaries until remedial action levels for ground water have been achieved.
Remedy:
SELECTED REMEDIAL ACTION: The selected remedial action for this site includes natural flushing and attenuation of contaminants from the contaminated aquifer, and allowing ground water to discharge onsite to the Tuscarawas River; installing onsite ground water monitoring wells; installing and sampling background wells; sampling Tuscarawas River sediment and benthic organisms; and implementing institutional controls including deed restrictions to prevent installation of drinking water wells onsite until remedial action levels for ground water have been achieved. The estimated present worth cost for this remedial action is $504,600, which includes a present worth O&M cost of $455,400.