Key Environmental, Inc.
Aerial Site View
 
Site Remediation and DNAPL Management
Investigation, Remedy Selection, Design, Operations, Maintenance and Monitoring
Impacted Groundwater Zones
Project Activities
  • Site Characterization, Including Soils, Groundwater and Sediments
  • DNAPL Mobility and Collectability Assessments
  • Remedy Selection and Regulatory Negotiations
  • Corrective Measures Study
  • Design and Installation of a DNAPL Recovery System
  • Closure Plan Development for Several RCRA Units Including a Waste Pile Building, Surface
  • Impoundment, and Process Sump
  • Construction Quality Assurance During RCRA Unit Closure
  • Operations, Maintenance, and Monitoring
The project site is a 17-acre former raw coke-oven-tar processing facility which produced pitches, bitumen, and other specialty refined tars. The facility ceased operations in 1987 and was subsequently dismantled. The facility is being addressed in accordance with a March 1990 RCRA Administrative Order on Consent (AOC) entered into between our client and the USEPA (Region 5). COIs at the facility are primarily Polynuclear Aromatic Hydrocarbons (PAHs) and a limited number of metals. A pool of DNAPL exists in the subsurface and continues to act as a source of dissolved COIs in the groundwater, both on-site and off-site. An interim remedial action to pump groundwater and recover DNAPL was implemented at the facility due to concerns regarding a creek located along the facility property boundary. The original Corrective Measures Study (CMS) recommended a sheet pile wall barrier system, facility-wide cap, DNAPL recovery, and groundwater pumping and treatment, as the final corrective measures. KEY conducted preliminary remedy assessment and design activities, and demonstrated that the original CMS recommendations were inappropriate and costly. KEY completed negotiations with the USEPA and prepared a Final CMS which was subsequently approved and used by the USEPA to prepare the Statement of Basis. The final corrective measures will consist of limited soil removal, placement of a cover material over a three acre area to allow for potential future facility re-use, installation of on- and off-site DNAPL recovery wells, and natural attenuation of COIs in groundwater.
Highlights
KEY successfully negotiated with the City Publicly Owned Treatment Works (POTW) for acceptance of co-generated groundwater, following treatment by oil/water separation, to avoid costly on-site treatment.
The approved revised CMS reduced the scope and costs of the remedial components.