Sediment Remediation

Sediment Remediation

Remediation Design

In accordance with Part 201 of Michigan’s environmental regulations, Consumers Energy has proposed a remediation project to address Flint River sediment impacted by historical MGP operations. The remediation activities will be completed between the Hamilton Dam and East 5th Avenue, and will include:
  • Mechanically dredging impacted sediment and excavating riverbank soil.
  • Removing water from sediment and disposing of sediment and soil in an approved landfill offsite.
  • Treating and discharging water from the dewatered sediment under an approved permit.
  • Installing a multi-layer protective barrier in the river.
  • Restoring the remediation area.

Remediation Permitting

The remediation project is currently in the engineering and permitting phase. Before cleanup activities can begin, the project will require permits from federal, state and local agencies which include:
  • Joint Permit Application
  • Soil Erosion and Sedimentation Control
  • National Pollutant Discharge Elimination System

Remediation Objectives

The objectives of the sediment remediation activities are to:
  • Address the direct contact exposure pathway for MGP-related impacts in sediments and riverbank soil.
  • Meet Michigan Department of Environmental Quality (MDEQ) compliance criteria for groundwater venting to the river.
  • Restore the river to meet MDEQ flood stage requirements.
  • Complete the work in a manner that is protective of people living, working and going to school in the vicinity of the site.

After the remediation work in the river and along the riverbank is completed, the site and surrounding area will be returned to pre-remediation land uses. Trails, walkways, benches and picnic tables will be restored in their present locations, and trees, shrubs and other plants will be reestablished.

Remediation Schedule and Updates

Site preparation activities are proposed to begin in spring 2017 and will include clearing trees and shrubbery from both sides of the river, constructing a dewatering pad and water treatment system on Consumers Energy parking lot, installing silt and security fencing around the work area, establishing traffic control measures for vehicle and pedestrian traffic and setting up site security. Dredging, excavating and capping are proposed to occur between May and September 2017, and were scheduled to minimize impacts to the University of Michigan – Flint. Site restoration activities will be substantially completed in fall 2017.