West Conshohocken, PA

Time Frame: July 2008 - April 2009

EAT was contracted to excavate and remove both unknown and known 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 involved several different waste streams that required extensive effort to excavate, manage on-site, stockpile, transport, and dispose of at multiple different facilities. The known/unknown substructures included a tar holder, USTs, concrete pads, timber piles, abandoned natural gas piping, and asbestos-wrapped piping. EAT excavated and removed almost 5,000 tons of MGP-impacted soil and debris, 500 tons of TSCA-level PCB-impacted soil and debris, 2,500 linear feet of piping, and shipped 180,000 gallons of water offsite that had both MGP and PCB impacts.

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Flemington, NJ

Time Frame: September 2016 - September 2017

EAT was contracted to perform site remediation in Flemington, NJ. The project involved the excavation, transportation and disposal of 16,000 tons of MGP impacted soil, diverting 1,200 linear feet of a stream and excavating the sediment within that stretch.

Restoration of the stream and both banks included a variety of stabilization techniques including the installation of coir logs on both sides, live stakes and brush mattresses.

Installation of impermeable HDPE liner to delineate between excavated and non-excavated areas

Site after planting trees, shrubs, and hydroseeding

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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.

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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Darby, PA

Time Frame: September 2017 - September 2018

Enviro-Air was contracted to remediate a former MGP site, located on both sides of Darby Creek in Darby, PA. Fifteen thousand (15,000) tons of MGP impacted soil were excavated and disposed of offsite at a treatment/disposal facility. The excavation along the creek involved the following:

- Installation of 6,250 square feet of soldier beams and lagging to allow for the excavation of MGP-impacted soils to a depth of 23 feet below ground surface. In conjunction with the lagging, 40 tiebacks were installed.
- Installation of a well point dewatering system, which ran 24 hours per day, seven days per week.
- Installation and operation of a water treatment plant consisting of activated carbon, bag filters, a weir tank and an 18,000-gallon frac tank.

In addition to the 15,000 tons of MGP-impacted soil that was removed from the site, EAT also excavated a 200 foot stretch of sediment from the bottom of Darby Creek (totaling 4,000 tons). The sediment excavation required the following:

- - Installation of a PortaDam both upstream and downstream of the excavation area. Two 48” x 200’ HDPE pipes were utilized in conjunction with the PortaDam to allow Darby Creek to bypass the excavation area.
  - Installation and operation of localized sumps to minimize water in the excavation area
  - Stabilization of saturated soils with cement kiln dust

A portion of the Darby Creek sediment excavation was around a 48” sewer main, which ran perpendicular to Darby Creek. The sewer main was approximately 60 years old and carries approximately 14 million gallons of sewage per day. EAT injection grouted underneath and on both sides of the sewer main to stabilize the pipe during excavation.

This project also required extensive restoration, including the following:

- - Construction of a boulder wall on top of bedrock by stacking ½ ton boulders.
  - Restoration of the creek bed
  - Installation of Coir matting
  - Installation of live stakes, various trees, shrubs, plugs and specialty grass mixtures

EAT completed the project to the satisfaction of the Client and property owner.

Installation of PortaDam with 48” HDPE pipe for stream bypass

Upstream PortaDam with 48” HDPE pipe for stream bypass

Downstream PortaDam with 48” HDPE pipe for stream bypass

Installation of soldier beams and lagging

Final subgrade of creek banks prior to restoration

Final subgrade of site prior to restoration

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Blue Island, IL

Time Frame: October 2009 - April 2010

EAT was contracted to perform the excavation of a six acre former MGP plant located in Blue Island, IL. The project involved the excavation, transportation and disposal of over 110,000 tons of MGP impacted soil. The entire 6-acre site was divided into 25′ X 25′ grids. Each grid was excavated and post excavation samples were taken. Oversight was by the Illinois EPA. Excavation depths ranged from a minimum of 3′ to up to 12′. EAT removed a tar separator and stabilized the contents of the separator, which was then shipped to a hazardous waste landfill. In addition, over 1,000 linear feet of 24″ iron piping was cleaned, removed and recycled. Three gasholders were removed as well as one 225,000-gallon AST. Multiple other vessels as well as hundreds of feet of smaller piping were cleaned and removed. Over 100,000 gallons of impacted water was collected and shipped offsite.

EAT rerouted a stream and remediated the streambed, excavating to depths up to 8′ in the bed. Over 25,000 tons of backfill were imported and compacted.

Over 6,000 truckloads of material were shipped out of and brought into the site, along a railroad siding over the course of 7 months.

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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.