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Recent Projects

Lake Lorraine

Leesburg, FL

Highlights

  • 53,000 cubic yards of material removed
  • Hydraulic Dredging to Geotextile tubes
  • Automated Polymer Injection System
  • Dewatering site less than 1 acre in size
  • Dredging, Dewatering, Hauling and Disposal all simultaneously

Background

C&M Dredging performed an environmental restoration dredging project to restore water quality and depth to Lake Lorraine in Leesburg, FL. The project consisted of removing 53,000 cubic yards of silt and muck from the 10-acre lake utilizing hydraulic dredging. The core project challenge was that all the material had to dewatered/dried and loaded for transport on an adjacent site less than one acre in size. To accomplish this task, we employed an 8-inch swinging ladder Ellicott Dredge to pump the material to our dewatering site. We introduced a polymer utilizing an automated chemical dosage system to ensure the material rapidly dewatered in the geotextile tubes. Over four months, C&M Dredging used 75 geotextile tubes that were cycled in real-time (8 tubes per cycle) while the dredging was taking place. The dredged material was sufficiently dried and loaded into trucks for beneficial reuse within three days after it was pumped into the tubes. Furthermore, the material reduced in volume by 50% from when it was dredged to when it was disposed of through proper implementation of the geotextile tube and polymer dewatering setup.

The greatest value add provided to the client was that C&M Dredging was able to coordinate and accomplish the work on a minimal staging and loading site that would typically require the use of mechanical material dewatering or belt presses in less time and at less cost. By properly utilization of geotextile tubes and partnering with industry leaders in chemical dosing and automation, C&M was able to perform the work faster and at less expense than conventional small footprint dewatering methodologies.

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Hurricane Damage Restoration

Florida Keys

Highlights

  • Remote Island Location 3 miles from mainland in FL Keys
  • Hydraulic Dredging to Geotextile tubes
  • Automated Polymer Injection System for Material Dewatering and Clean Effluent Requirements
  • Dewatering site constructed on sectional barge at island location
  • Dredging, Dewatering, Hauling and Disposal all simultaneously
  • Geotextile tubes transported by barge back to mainland daily for offloading into trucks
  • Sensitive Marine Benthic Resource avoidance and protection integral part of project requirements

Background

C&M Dredging performed an environmental restoration dredging project to reverse impacts caused by hurricane damage to an island resort in the Florida Keys. A canal system and basin system that was in place for barges and vessels that serviced the island resort daily had been filled in by hurricane-force winds and tidal surge.

The difficulty was that the project site was 3 miles from the mainland, on an island. All equipment and personnel had to be transported out to the project site daily. Also, all the material was required by permit to be dredged hydraulically and dewatered without violating turbidity requirements.

C&M Dredging proposed and implemented a plan to meet the project needs by constructing a sectional barge at the project site that would hold a geotextile tube and chemical treatment system, serving as a remote, floating dewatering site.

We used a compact, shallow draft hydraulic dredge to perform the work in the canals and basin. We transported the material contained in the geotextile tube on the barge 3 miles back to the mainland every couple of days, and a new bag installed and transported back to the island.

C&M also worked with local resources to arrange for the offloading and transporting of the material to another site for separation and disposal/beneficial reuse.

This project required careful planning, coordination, and execution as well as out of the box thinking on the part of the project team at C&M Dredging. We completed the project successfully, working with the Florida Department of Environmental Protection and Florida Keys National Marine Sanctuary to ensure all marine benthic resources were protected, and the project owners’ needs were met.

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