Record of Decision System (RODS)
|Site Name:||ORMET CORP.|
|Address:||ST RTE #7|
|City & State:||HANNIBAL OH 43946|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Media:||groundwater, leachate, soil|
|Contaminant:||Tetrachloroethene (PCE), cyanide, fluoride, arsenic, antimony, and beryllium|
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 property currently known as the Ormet Corporation Superfund site is owned and operated by the sites namesake, the Ormet Corporation. The ormet Corporation is an aluminum reduction facilitiy locted in Monroe County, Ohio, on the west bank of the Ohio River. Immediately to the southwest of the Ormet Site is the Consolidated Aluminum Corporation (CAC).
The Ohio River is immediately adjacent to the site, and is used for commercial and recreational boat traffic. The Hannibal Lock and Dam is approximately 3 miles down river. The primary population centers are Hannibal, Ohio, New Martinsville, West Virginia, and Proctor, West Virginia. There are no drinking water intakes along the river within 100 miles downstream of Ormet.
The Ormet Site is located in an area known as Buck Hill Bottom, a portion of the Ohio River Floodplain that formed as river sediments were deposited on the inside of a meander bend. The Ormet property occupies about 245 acres in the northern portion of the area. The northeastern portion of the Ormet property is the area that we investigated during the Remedial Investigation and Feasibility (RI/FS).
Since the plant started operations in 1958, Ormet's main process has been the reduction of alumina to produce aluminum metal. From 1958 to 1968, approximately 85,000 tons of spent potliner, a hazardous by-product of aluminum production (containing cyanide) were placed in an unlined , 10-acre open area in the northeast part of the Site, identified in Figure 2 as the Former Spent Potliner Storage Area (FSPSA).
There are five impoundments on Site, called the Former Disposal Ponds (FDP). Total area of FDPs 1-4 is about 5 acres. FDP 5 is about 13 acres in size. These pounds are unlined and constructed of natural materials. FDPs 1 through 4 received approximately 50,000 cubic yards of process waste form the air emissions wet scrubbing system in the form of sludge, the primary constituents of which were alumina, particle carbon, and calcium-based salts. The volume of materials in FDP 5 is about 370,000 cubic yards. The volume of materials in FDP 5 is about 370,000 cubic yards. Since 1980, spent potliner material generated by the plant has been transported off-site for disposal.
From about 1966 until mid-1979, Ormet deposited waste construction materials and other miscellaneous plant debris, including capacitors and spent potliner, in the southeastern corner of the Site, adjacent to Pond 5 and the Ohio River. This 4 to 5 acre area is designated as the Construction Material Scrap Dump (CMSD). A list of materials disposed of in the CMSD is contained in the RI report, Appendix G.
An area referred to as the Carbon Runoff and Deposition Area (CRDA) contains carbon deposits, probably carried there by storm water runoff from an area of the Ormet plant where spent graphite anode were crushed in a mill. Some of the carbon runoff may also have entered the 004 outfall stream and backwater area.
In 1972, Ormet initiated a groundwater investigation which identified high levels of fluoride coming from FDP 5. To protect the quality of its process water, two extraction wells were installed to intercept the plume. These wells have operated continuously through the present day.
A 1978 study by Ormet showed improvement in the groundwater from under FDP 5, but indicated decreased quality in the area of the FSPSA. A 1984 study confirmed that the FSPSA was leaching contaminants to groundwater. Additional sampling in 1985, 1986, and two rounds of sampling during the Remedial Investigation (RI) in 1988 and 1990 show concentrations of fluoride in groudnwater decreasing down-gradient of the disposal ponds, but fluoride and cyanide are on the rise in and downgradient of FSPSA.
The 1985 study identified low levels of toluene but no other organic compounds in groundwater. Based on contamination found at the Site and its potential impact on drinking water supplies, U.S. EPA placed the site on the National Priorities List (NPL) in September 1985.
In May 1987, the United States Environmental Protection Agency (EPA), Ohio Environmental Protection Agency (OEPA), and Ormet Corporation (Ormet) entered into an Administrative Order by Consent (Consent Order) providing for Ormet to conduct Remedial Investigation/Feasibility Study (RI/FS) under EPA and OEPA supervision. The RI report was completed in December 1992 and the FS was completed in December 1993.
In addition to defining the contamination found in the disposal areas described above, seeps were discovered during the RI near the Plant Recreational Area ballfields and along the western edge of the CMSD.
|Remedy:||The selected remedial action for this site includes: continuing to pump at the Ormet Ranney well and existing interceptor wells; intalling trench drains to intercept or extract leachate; recontouring and covering the dual-barrier cap; treating the soil through in-situ flushing; excavating and consolidating contaminated soils and dredging the PCB and PAH contaminated sediments from the backwater area.|
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