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Record of Decision System (RODS)



Address:  6MI S OF ELWOOD OFF RTE 53 
City & State:  JOLIET  IL  60434
County:  WILL
EPA ID:  IL7213820460
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-99/041
ROD Date:  10/30/1998
Operable Unit(s):  01, 02
Abstract:  The Joliet Army Ammunition Plant (JOAPP) is a former U.S. Army munitions production facility located on appropriately 36 square miles of land in Will County, Illinois. The JOAAP is located approximately 17 miles south of Joliet and is divided into two main functional areas: The Load-Assemble-Package Area (LAP) and the Manufacturing Area (MFG). The MFG area, covering approximately 14 square miles, is where the chemical constituent of munitions, propellants and explosives were manufactured. The production facilities are located in the northern part of the MFG Area. On the southern half of the MFG Area, there is an extensive explosive storage facility. The LAP Area, covering approximately 22 square miles, is where munitions were loaded, assembled, and packaged for shipping. This are of JOAAP contains munitions filling and assembly lines, storage area, and a demilitarization area.

JOAPP was constructed during World War II for the purpose of manufacturing, loading, assembling, packing, and shipping bombs, projectiles, fuses, and supplementary charges. Uniroyal Chemical Company, Inc. operated the JOAAP as a government-owned, contract-operated facility until 1993. In April 1993, the property was declared as excess by the Army and is now being maintained by a small staff. The facility is undergoing transfer to various Federal, local and state jurisdictions.

Final listing on the NPL took place on July 21, 1987 for the MFG Area, and March 31, 1989 for the LAP Area. In 1989, the Army, the USEPA, and the Illinois EPA entered into a Federal Facilities Agreement to ensure that environmental impacts at the site would be investigated and that remedial action would be taken.

This Record of Decision (ROD) addresses two operable units, one for soil (SOU) and one for groundwater (GOU). The SOU is divided into six soil remediation units (SRUs) involving CERCLA-based remediation, one SRU involving non-CERCLA removal action, and an eighth group involving the No Further Action (NFA) sites for soil. The GOU is divided into three ground remediation units (GRUs) involving CERCLA-based actions and one group including the NFA sites for groundwater. From 1983 to 1985, a remedial action was conducted by Uniroyal at the Red Water lagoon. Following the removal of contaminated materials, a clay cap was installed over the lagoon. In 1996 and 1997, the U.S. Army Corps of Engineers conducted four removal actions to prevent the mitigation of contaminants from source areas. The Omaha District, Corps of Engineers conducted a removal action along Prairie Creek.

A Record of Decision was completed in October 1998 that addressed the final response actions for soil at SRUs 4, 6, and 7 and groundwater at both OUs. The ROD also addresses interim actions for SRUs 1, 2, 3, and 5.
Remedy:  The selected alternatives for the seven soil remediation units include the design and implementation of several remedial actions. The selected remedies for the soil treatment contain several common actions. With the exception of capping, all the selected remedies include excavation, treatment, or disposal of soil containing contaminant concentrations above remediation goals (RGs). The selected remedy for each Soil Remediation Unit (SRU) is as follows:

SRU1: Bioremediation
SRU2: Excavation and Disposal
SRU3: Bioremediation and Disposal, and Excavation and Disposal
SRU4: Excavation, Incineration and Disposal
SRU5: Excavation and Disposal
SRU6: Capping and Excavation and Disposal
SRU7: Removal and Recycle or Disposal
SRU8: No Further Action.

The Bioremediation remedy includes building demolition; soil excavation; transportation and confirmatory sampling; soil preparation; bioremediation; backfilling, regrading, and revegetating excavated areas; soil disposal, treatment area decommissioning; and institutional controls.

The excavation and disposal remedy includes soil excavation; transportation and confirmatory sampling; soil preparation, backfilling, regrading, and revegetating excavated areas; soil disposal; and institutional controls.

The soil incineration alternative includes excavation and disposal. Depending on confirmatory sampling results, there are three different disposal options. If polychlorinated biphenyls (PCBs) are below 50 ppm, then the soil will be disposed at a Resource Conservation and Recovery Act (RCRA) Subtitle D facility. If PCBs are between 50 and 500ppm, then soil will be disposed at a Toxic Substances Control Act (TSCA) landfill, and if PCBs are greater than 500ppm the soil will be incinerated offsite in accordance with TSCA. For the capping alternative, landfills in sites L3 and M11 will be capped with a RCRA Subtitle C cap and M13 landfills will be capped with a Subtitle D cap. Landfills in sites L4, M1 and M9 will be excavated and disposed offsite.

The removal and recycle or disposal selected remedy includes soil excavation, transportation, and confirmatory sampling; backfilling, regrading, and revegetating excavated areas; sulfur recycle or disposal; and institutional controls.

Remedial actions at all sites for the Groundwater Operable Unit are considered final. The limited action remedy was selected for the three groundwater remedial units (GRU 1, 2, and 3). This selected remedy combines source removal of overlying contaminated soils; institutional controls to prevent exposure to potentially contaminated groundwater; and monitored natural attenuation to lower contaminant levels in groundwater to below the RGs. Institutional controls are required because levels of some contaminants in groundwater exceed safe levels for human consumption, and may exceed those levels for several decades. One of the primary institutional controls is the imposition of site-specific deed and zoning restrictions. This selected remedy also includes contingency plans should the remedy prove ineffective. No Further Action was required for GRU4.
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