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Record of Decision System (RODS)



Address:  RTE 83 & JEANE RD 
City & State:  LEMONT  IL  60439
County:  DUPAGE
EPA ID:  ILD005451711
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-99/162
ROD Date:  09/30/1999
Operable Unit(s):  01
Media:  Groundwater, Other, Sediment, Surface Water
Contaminant:  Inorganics, Metals, PAH, PCBs, VOC
Abstract:  The Lenz Oil Services, Inc. Site is located 400 feet northwest of the Des Plaines River in DuPage County, Illinois. The area in and around the site is zoned light industrial. Currently the site is a flat, vacant area consisting of a radio tower, monitoring wells, two utility manways, and a fenced drum storage area.

Lenz Oil operated as a recycling, storage, and transfer facility for waste oil from April 1961 to November 1985. The EPA cited the facility in 1982 for operating as a Resource Conservation and Recovery Act hazardous waste facility without having a permit. On May 22, 1985, Lenz Oil entered into an agreement with the state to implement a cleanup and closure plan for the site. Lenz Oil did not carry out major portions of this order and they eventually filed for bankruptcy in April 1986. The state issued a Record of Decision (ROD) for the site in January 1986, which initiated an immediate removal action at the site. By 1988 they had made several removals including 21,00 tons of contaminated soil at the as well as providing local residents with municipal water hookups.

This site was listed on the National Priorities List in October 1989. In November 1989, certain Potentially Responsible Parties signed an administrative order to conduct a remedial investigation/feasibility study to determine the nature and extent of the contamination. A ROD for Phase I remedial action (Operable Unit 1) was completed in September 1999.
Remedy:  U.S. EPA, in consultation with Illinois EPA, has selected Alternative 9A as the primary remedial alternative for phase I cleanup at the Lenz Oil site. U.S. EPA has recommended further evaluation of at least two alternate approaches, Alternatives 10 and 11, both with contingent alternative II-2, during predesign to determine whether either could provide a level of protection of human health and the environment similar to that offered by alternative 9A. The major element that distinguishes contingent remedy Alternative 10 is the use of vacuum enhanced recovery to remove the light non-aqueous liquid (LNAPL) from the subsurface. Contingent remedy Alternative 11 is distinguished by the use of in situ Low Temperature Thermal Desorption to treat the contaminated area. Finally, the major element that distinguishes Phase II-2 is the use of extraction wells penetrating the aquifer to extract the dissolved LNAPL with treatment prior to discharge to the local Publically Owned Treatment Works.

The major elements of Alternative 9A are the excavation and treatment of LNAPL-contaminated material and disposal of the treated material on-site in a corrective action management unit (CAMU).

Excavation of LNAPL and LNAPL-Contaminated Material: An estimated 12,500 cubic yards of soil and weathered bedrock contaminated with LNAPL would be analyzed and managed as clean soils and stored on-site for use as backfill. Excavation would continue until all are in compliance with Toxic Substance Control Act regulations, and until the levels of contaminants remaining in the ground pose no unacceptable risks to human health or the environment.

Treatment of LNAPL-Contaminated Material via Solidification/Stabilization: Material would be treated either in an excavation cell or in an on-site blending unit. The excavated material would be treated either in an excavation cell or in an on-site blending unit. The excavated material would be blended with the stabilization mixture determined during predesign studies to be most effective. Samples of the stabilized material would be collected periodically and analyzed using the toxicity characteristic leaching procedure method to confirm that minimal or no leaching of contaminants will occur.

On-Site Disposal of Treated Material in a CAMU: The CAMU at the Lenz Oil site will be located generally in the main excavation area of the Illinois EPA removal action. All CAMU monitoring requirements will apply, and the CAMU shall be managed and monitored so as to minimize any future releases of waste to the environment. Institutional controls and deed restrictions will be implemented as necessary as well as site fencing and long-term operation and maintenance.

Estimated Capital Cost: Not Documented
Estimated Annual O&M Cost: Not Documented
Estimated Present Worth Cost: $12,500,000
Estimated Total Capital O&M Cost: $12,500,000
Text:  View full-text ROD [ 508K ]
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