Former Portage Lake Shipping Canal Dredging

Removal and disposal of MGP impacted sediments.

Project Summary

CONTRACT VALUE: $2,300,000


White Lake Dock & Dredge provided a turn-key site and sediment remediation service for cleanup of a former MGP site in Hancock, MI. White Lake dredged 6,000 CY of MGP impacted sediment utilizing RTK-GPS guidance control integrated with our Case CX460 Custom Long Reach Excavator. To prepare the dredge area, White Lake constructed a dual pile supported turbidity curtain dredge area containment system ranging in depth from zero to 37 feet in depth. White Lake completed this project safely, on-time, and within budget while minimizing community impact by performing the work in late fall and early spring avoiding impact to seasonal recreational use of the water way.


As an integral component of this project, White Lake extracted over 100 timber piles from the dredge area and surrounding containment area. In addition, White Lake was tasked with demolishing several on-site buildings that were contaminated with asbestos.


After dredging, White Lake installed a subaqueous cap consisting of sand to restore grade, one foot of 3” filter stone, and then two feet of 16” riprap armor stone across the entire dredge area. Capping was performed using our Case CX460 Custom Long Reach Excavator. Thickness control was achieved through innovative use of the RTK-GPS dredge guidance system and unique in-house multi-beam hydrographic surveying capability.


As part of this project, White Lake designed and constructed a 15,000 SF lined and contained dewatering pad with integral drainage system. From this drainage pad, all contaminated sediment derived and construction wastewater was contained collected and transported to the local PTOW for treatment.


After sediments were de-watered and processed to meet landfill disposal requirements, the material was re-handled by our Sennebogen 835 RHD and loaded into highway trucks for transportation to a permitted solid waste landfill.


Environmental controls included the dual turbidity curtain work area enclosure, specialized environmental dredge bucket, sealed material barges, and spray applied foam encapsulation to control volatilization. In addition, White Lake demolished two buildings having lead paint and asbestos concerns.

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