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.

Excavation of impacted soil to facilitate new sewer line

Temporary dam to allow for dredging of impacted sediment

Impacted soil before In-Situ stabilization

Specialty excavator utilized for In-Situ stabilization

Site overview during In-Situ stabilization

Clean backfill placed over In-Situ stabilized soil

Compacting clean backfill placed over In-Situ stabilized soil

Site overview after In-Situ stabilization

Site overview after backfill and final grading

Site restoration; new chain link fence and live stakes

Site restoration; live stakes and rock to protect river bank

Site restoration; netting placed to minimize damage to plantings by local wildlife

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Toms River, NJ

Time Frame: January - June 2016

EAT was contracted to excavate and remove both known and unknown substructures and piping, MGP impacted material and TSCA-level PCB impacted material from an area directly adjacent to an active natural gas facility. This project encompassed several different waste streams that required extensive effort to excavate, manage on site, stockpile, transport and dispose of at multiple treatment/disposal facilities. The known/unknown substructures included a tar holder, USTs, concrete pads, timber piles, abandoned natural gas piping and asbestos wrapped piping. Dewatering and handling/disposal of impacted groundwater was a challenging aspect of this project.

Seven (7) waste streams were excavated, segregated and stockpiled on site including:
- TSCA PCB soil
- TSCA PCB pipe/debris
- Low level PCB soil
- Low level PCB debris
- MGP soil
- MGP pipe/debris
- Clean pipe/metal
Excavated, transported and disposed of:
- 2,500 linear feet of underground piping
- 500 tons of TSCA PCB impacted soil, piping and debris
- 5,000 tons of low level PCB impacted soil and debris
- 800 tons of MGP impacted soil
- 180,000 gallons of MGP impacted and PCB impacted water

EAT finished the project ahead of schedule.