Muskegon, Michigan
The RCO Sediment Remediation Project site is a 12-acre part of the Muskegon Lake AOC, which is a 4,179-acre drowned river mouth lake that flows into the eastern shore of Lake Michigan. Muskegon Lake was designated an AOC through the Great Lakes Water Quality Agreement in 1987 due to ecological problems caused by historical industrial discharges of pollutants, shoreline development and hardening, historic sawmill debris, foundry sand and slag filling open water and coastal wetlands, and localized groundwater contamination moving toward the lake and its tributaries. The contaminants of concern included petroleum, metals, and PAHs.
Sevenson’s SOW as the prime contractor included in-water debris removal of 2,225 tons and mechanical dredging of 10,758 CY. The dredged sediment was dewatered, off-loaded, stabilized, stockpiled, and transloaded for approved off-site transportation and disposal. Crews installed, constructed, operated, and maintained a 100-GPM WWTP (treated and discharged 221,505 gallons); placement of 88,261 SF of residual cover material (coarse sand); and habitat restoration of a 6-acre area.