Nanticoke, PA

Time Frame: August 2016 - December 2016

Enviro-Air was contracted to remediate several different locations at a former Manufactured Gas Plant and demolish an industrial building.

Once the building was demolished, approximately 5,000 tons of MGP impacted soil from a gas holder were excavated, transported and disposed of.

Remediation continued in a wetlands area. Enviro-Air installed a temporary Aqua Dam and dewatered the area. A cement-based reagent was utilized to successfully perform in-situ stabilization (ISS) on 6,200 cubic yards of MGP impacted sediment. When the ISS work was completed, gabions and reno mattresses were installed around the perimeter of the stabilized area. More than 26,000 square feet of area was restored and over 1,000 wetlands plants were planted.

A third phase of this project was the excavation of a gas holder foundation and impacted soil in the rear parking lot of a supermarket. Site activities were carefully coordinated so as to cause the least amount of disruption as possible to the supermarket operations.

Excavation of impacted soil; odor suppressant foam has been applied to minimize odors

Tanks and hoppers used to distribute concrete dust during In-Situ Stabilization

Hopper used to distribute concrete dust during In-Situ Stabilization

Concrete dust distributed in In-Situ Stabilization area

Site overview after In-Situ Stabilization

In-Situ Stabilization area sub-grade; AquaDam was still in place

Final restoration of In-Situ Stabilization area; AquaDam was removed

Final restoration of In-Situ Stabilization area

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Claremont, NH

Time Frame: June - September 2015

This cleanup was the first of its kind in the state of New Hampshire. The project was a joint effort between the US EPA, New Hampshire DEQ and the Client. The site was located on the Sugar River in Claremont, New Hampshire and was the home of the former Claremont Gas Works, which began manufacturing gas for lighting streets, factories and other buildings in 1859.
Enviro-Air was contracted to perform the following work:

Remove asbestos roofing and dispose of it prior to the demolition of a building
Demolish a large process building
Demolish a gas holder
Perform In-Situ Stabilization (ISS) on 4,000 cubic yards of extremely high DNAPL impacted soil
Excavate, transport and dispose of 9,000 tons of MGP impacted soil
Install a temporary dam and dredge 400 cubic yards of MGP impacted sediment from the Sugar River
Dewater excavations and treat approximately 200,000 gallons of MGP impacted water, which was then discharged to the sewer line
Implement a 1,500 linear foot sewer bypass, replace 900 linear feet of sewer line running through the ISS area and install 3 manholes
Restore the shoreline and wetlands area

This project was completed ahead of schedule to the complete satisfaction of the Client and all regulatory agencies involved.