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Record of Decision System (RODS)



Address:  EAST OF STATE ROUTE 148 
City & State:  CARTERVILLE  IL  62959
EPA ID:  IL8143609487
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/154
ROD Date:  02/19/1997
Operable Unit(s):  03
Media:  Soil,sediment,surface water,groundwater.
Contaminant:  Heavy metals, nitroaromatic compounds.
Abstract:  The Crab Orchard National Wildlife Refuge (NWR) is located approximately 5 miles west of Marion, Illinois. It is near the center of the southern tip of the state, with the Mississippi River approximately 25 miles to the west and the Ohio River approximately 55 miles to the east. The refuge currently comprises an area of approximately 43,500 acres of forested land, pine plantations, and cultivated lands. A portion of the refuge is set aside for industrial purposes. Three lakes are located within the refuge, including Crab Orchard Lake, a 7,000 acre man-made reservoir. The affected areas within the refuge are currently divided into five separate operable units (OUs); this ROD pertains to the Explosives/Munitions Manufacturing Areas (EMMA) OU. Fifteen individual sites were investigated within the EMMA OU.The eastern portion of the refuge was transferred to the War Department for construction of the former Illinois Ordnance Plant (IOP), also known as the Crab Orchard Ordnance Plant. The IOP was constructed in 1941 for the U.S. Army as part of its defense program. The major activity conducted at the IOP consisted of trinitrotoluene (TNT) melt-pour operations. Various munitions and munitions items, including 500-pound bombs, anti-tank mines, and 155 mm shells, were filled at the former plant. The IOP also contained an ammonium nitrate production unit as well as storage and shipping areas, a shop, and maintenance area. The plant was closed in 1945, shortly after the end of World War II. It was decontaminated in accordance with military specifications and leased to private industrial tenants. Electrical equipment containing polychlorinated biphenyls (PCBs), boats, corrugated boxes, explosives, and plated metal parts are among the products that have been manufactured on the refuge. Accountability for the property was transferred to the U.S. Department of the Interior (DOI) in 1947; an agency of DOI continues to administer the refuge. Historic land uses such as ordnance manufacturing, testing, and disposal practices have affected the environment.The Crab Orchard NWR was placed on the National Priorities List (NPL) in 1987. The cleanup investigation was completed in the fall of 1994. A study on the fifteen affected sites within the refuge was completed the following year. Currently, Crab Orchard Lake provides sport fishermen with largemouth bass, catfish, sunfish, and crappie. It was used a drinking water source for the refuge and Marion Federal Penitentiary until 1993 when the water treatment plant was closed. Water for the refuge and the penitentiary is currently supplied by the Herrin municipal system.
Remedy:  The baseline risk assessment of 13 of the 15 sites concluded that they do not likely pose a potential risk to human health and the environment and, therefore, no further action is recommended at these sites.The remaining two sites are the COC-3 and COP-4. The major components of the selected remedy for these sites include: excavation and off-site treatment (incineration) and disposal of soils; additional removal of RDX/HMS (explosive compounds) contaminated soil at site COP-4 to a depth of 2 feet below grade within the existing fenced area and disposal of those soils at an off-site permitted special waste landfill; sampling of soils; backfill excavated areas to shape the base of the covers; placing soil covers over the remaining affected soils; long-term maintenance of the soil covers for a period of up to 30 years; implementation of land-use controls; and groundwater monitoring.
Text:  View full-text ROD [ 126K ]
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