Record of Decision System (RODS)
ORDNANCE WORKS DISPOSAL AREAS
|Site Name:||ORDNANCE WORKS DISPOSAL AREAS|
|Address:||1100 DUPONT RD|
|City & State:||MORGANTOWN WV 26505|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Media:||Sediment, Soil, Surface Water|
|Contaminant:||Metals, PAH, VOC|
The Ordnance Works Disposal Areas Superfund Site (site) is located on Monongalia County along the west bank of the Monongahela River approximately one mile southwest of the City of Morgantown, West Virginia. The property on which the site is located consists of approximately 800 acres and is wooded with rolling hills. A small portion of this property was used as a disposal ground during manufacturing operations and later became known to EPA as Operable Unit No.1 (OU1) of the site. The remaining tracts of land within the property containing, among other things, the manufacturing facilities, are known to EPA as Operable Unit No. 2 (OU2) of the site.
The property where the site is located has contained active chemical production facilities since the 1940s. It consists of numerous tracts of land containing approximately 800 acres originally assembled by E.I. DuPont de Nemours & Company (DuPont) between 1940 and 1943, pursuant to agreements between DuPont and the United States. Between 1943 and 1962, the United States held legal title to these facilities. Between 1941 and 1958, various operations were conducted by private parties, in some cases pursuant to government contracts and operating agreements, and in other cases pursuant to commercial leases. From 1958 through 1962, the plant was idle.
In 1962, the property was sold to Morgantown Ordnance Works, Inc. Between 1962 and 1978, Morgantown Ordnance Works, Inc. leased and/or sold portions of the site property for various industrial and chemical manufacturing activities. Except for parcels previously sold, the site was acquired by Princess Coals, Inc. in 1978. In 1982, the Site was purchased by private individuals who later formed Morgantown Industrial Park, Inc. In 1983, the property was conveyed to Morgantown Industrial Park Associates, limited Partnership (MIPA), the current property owner. Portions of the site owned by General Electric Company (GE) are currently active and being investigated under the Resource Conservation and Recovery Act (RCRA) agreement with EPA.
As a result of the manufacturing operations conducted at the site, hazardous substances were generated and subsequently disposed at, among other places, OU1 at the site. OU1 was proposed for inclusion on the Environmental Protection Agency's (EPA's) National Priorities List (NPL) on October 15, 1984 and was finalized on the NPL on June 10, 1986. There are no current plans to expand the National Priority List (NPL) listing to include OU 2.
OU 1 consists of approximately four to six acres and is located at the southern end of the site property. Major OU1 features include an inactive, abandoned landfill; a former lagoon area; and area referred to as the "scraped area" formerly used for the shallow disposal of wastes; and contaminated stream sediments. There is also a small wetland area located adjacent to the onsite landfill. This wetland area is approximately one half acre in size. There are no domestic or municipal wells used for drinking water supply in the vicinity of the site. The area population draws drinking water from a surface water intake on the Monongahela River located approximately one mile downgradient of the site.
In January 1988, EPA completed a Remedial Investigation (RI) and Feasibility Study (FS) for OU1. In March 1988, EPA issued a Record of Decision (ROD) for OU1 calling for onsite incineration of soils and sediments. In September 1989, after conducting a focussed FS to re-evaluate the alternatives considered in the March 1989 ROD, EPA issued a new ROD selecting a "preferred" and "contingency" remedial action. In June, EPA issued an administrative order directing several parties to implement the new ROD.
In 1995, during implementation of EPA's June 1990 administrative order, the responsible parties recalculated the cleanup standards for cPAHs at the site using new cancer potency factor (CPF) established in Integrated Risk Information System (IRIS), and the interim comparative potency estimates established by Office of Research and Development (ORD). EPA agreed and negotiated a new agreement with such parties in October 1997.
A ROD was signed in September 1999 for OU1 which superceded the ROD issued in September 1989.
The selected remedy for Operable Unit 1 (OU1), is Alternative 5. It involves excavating the visibly stained tar-like materials from the Lagoon Area, Scraped Area, and stream sediments and transporting these excavated materials to an offsite thermal treatment facility. Mechanical methods such as a shaker-screen could be used to isolate debris (wood fragments, construction debris, bricks, etc.), tar, and soils. The actual equipment and methods which would be used in excavation and segregation activities will be determined during pre-design and design phases of the remediation. It is appropriate to treat the visibly stained tar-like material differently than the rest of the contaminated
soil because it contains extremely high concentrations of cPAHs and is, by virtue of its consistency, less amenable to capping.
All other soils from the Lagoon Area and Scraped Area that contain cPAHs in excess of the cPAH Cleanup Standard and inorganic compounds in excess of the inorganic cleanup standards set in the September 1989 Record of Decision (ROD), but do not contain visibly stained tar-like media, would be excavated and consolidated onto the existing landfill. Similarly, all sediments that contain cPAHs in excess of the cPAH Cleanup Standard or inorganic compounds above background levels, but do not contain visibility stained tar-like media would also be excavated and consolidated onto the existing landfill. The materials staged at OUI during the 1997 OU2 removal action would also
be consolidated onto the existing landfill.
A multi-layer RCRA cap would be constructed over the existing landfill. The exact specifications for this multi-layer RCRA cap would be determined during the Remedial Design.
Health and safety monitoring activities and dust control measures would also be required under this alternative.
After excavating the contaminated sediments from the streams, the streams would be restored to minimize erosion of the stream bed. Wetlands mitigation would be required and confirmation sampling for stream sediments would be conducted. Excavations in the Scraped
Area and the Lagoon Areas would be backfilled, regraded, and seeded. Confirmation sampling for the Lagoon Area and Scraped Area soil would be conducted. An ecological monitoring program will include sediment and surface water sampling in the streams and the wetland area.
Institutional controls would be implemented to protect the integrity of the cap, to prohibit residential development, to prohibit recreation use, and to prohibit operation of schools or child care facilities within OU1.
Because waste would be left onsite, the long-term monitoring program (including 5-year reviews) would be required.
Estimated Capital Costs: $6,033,199
Estimated Annual O&M Costs: $52,500
Estimated Present Worth Costs: $6,687,465
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