IAI served as sediment dewatering and water treatment subcontractor on the Waukegan Harbor OU1 project. The project removed 117,278 cubic yards of PCBs-contaminated sediment from Waukegan Harbor, in Waukegan, Illinois. Sediment was hydraulically dredged from the harbor and transferred to the landside facility for processing and disposal. The sediment processing system design included a trommel screen for large debris removal, and dredge slurry thickening in a gravity thickener, prior to geotextile tube dewatering. Large circumference geotextile tubes were stacked in three layers over the sediment Containment Facility. Water released from the geotextile tubes, storm water collected on the dewatering pad and clear water overflow from the gravity thickener was transferred to the on site water treatment plant for treatment prior to discharge back into the harbor. Dredging was completed over two seasons, 2012 – 2013.
Remediation Services
- Install and operate polymer make down and feed system
- Operate and maintain trommel screen and gravity thickener and ancillary equipment
- Design, install and operate the geotextile tube header system
- Deploy and operate of the geotextile tubes
- Start-up, operate and maintain 2,500 gpm (maximum design flow) water treatment plant, configured with lamella inclined plate clarifiers, pressurized multi-media filters, bag filters and Granular Activated Carbon (GAC) vessels
- Landside health and safety, including design and installation of personnel and equipment decontamination areas, determination and enforcement of site work zones, development and implementation of a written site-specific health and safety plan, and air monitoring
Dewatering and Water Treatment Equipment Utilized
- 17,625 lineal feet of geotextile tubes, 75 – 82 feet in circumference
- 8 inch diameter fused HDPE geotextile tube header system
- Gravity thickener with pre-screening (trommel screen)
- 150 gpm dry polymer make down and feed system and injection header
- 2,500 gpm design flow water treatment plant
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