MGP Site Remediation – Chicago, IL
MGP Site Remediation – Chicago, IL
RW Collins completed excavation and backfill activities in a 7.2-acre site of a former natural gas manufacturing plant in Chicago, IL. The MGP site contained active overhead transmission lines and 138kV pipe type underground cables positioned directly over a 450,000 cu. ft. former gas holder.
Remediation tasks
- Removal of the contents and gas holder walls and floors
- Backfill to subgrade with compacted limestone
- Apply odor and dust cover measures
Other tasks:
- Excavation to a depth of approximately 30 ft. below ground surface
- Extreme care taken to perform work safety beneath steel truss system
- Supported the installation of six steel sheet pile cofferdams
- Excavation of coal tar impacted soil
- Placement/compaction of limestone backfill was complete in each 30-ft. deep cell under the Confined Space Entry procedures
Project Facts
- 2-year project
- Excavating and loading more than 500,000 tons of coal tar impacted soil
- Placement and compaction of 500,000 tons of limestone aggregate backfill
- Pumping, onsite treatment and discharge of 3 million gallons of impacted water
- Compete removals of 290,000 and 200,000 cu. ft. gas holders
- Removal of two tar wells
