Soil Remediation at MGP Sites

Project Summary

ERG participated in a competitive bid process for all three (3) sites and was selected not on only price but also because of our expertise and suggested approaches to complete the projects.

  • Michcon, Broadway Service Center Ann Arbor, Former MGP Site
  • Michcon, Wealthy Service Center Grand Rapids, Former MGP Site
    • Soil impacted with byproducts produced from historical gas processes conducted on site.
    • Objective – selectively remove identified hot-spots of coal-tar, an MGP byproduct.
  • DTE Energy, Fowlerville Central Tank Battery, Fowlerville, Aboveground Tank Battery
    • Soil impacted by releases from several leaking aboveground storage tanks located on site.
    • Objective – remove impacted soil, assist with confirmatory soil sampling, and restore site.
Company: Dte Energy – Environmental Division
Category: Soil Remediation at Three (3) Sites
Location: Ann Arbor, Fowlerville, Grand Rapids – Michigan
Date: 2006 to 2010
Cost: $932,000 Combined
Focus: Soil/Groundwater Remediation at Former Manufactured Gas Plants (MGP) & Tank Batteries

Project Tasks

Maximize removal of coal-tar source and other impacted materials while minimizing infiltration of accumulated groundwater
All waste transported off-site for disposal at licensed facilities. Minimize disruption of site activities/personnel and ensure safety to immediate businesses, residences, and pedestrians, including implementation of dust and odor control measures. Remedial actions conducted per USEPA Area of Contamination (AOC) Policies, allowing movement/placement of wastes within areas of dispersed contamination.

Project Control

Under AOC, hot spots of material can be consolidated with less contaminated media within the excavation to promote beneficial physical/chemical characteristics of the material to facilitate subsequent treatment/disposal
Impacted materials were tested upon removal from the AOC to determine regulatory waste classification
Soil was excavated at the MGP site to 10’ – 20’ bgl and to 25’ bgl at the Tank Battery site
Accumulated groundwater was pumped to on-site frac tanks prior to disposal at a licensed industrial waste facility
Air monitoring and traffic control were performed continuously to ensure public safety
Dust suppression was achieved via misting and street sweeping
Sand and foam were applied for odor suppression
Upon completion of backfill operations, disturbed surfaces at each site were restored to pre-remediation conditions.
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