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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Hometown, PA

Enviro-Air was contracted to perform remedial activities at a former wire recycling facility that is on the EPA Superfund List. The US Environmental Protection Agency (EPA), U.S. Army Corp of Engineers (USACE) and the Pennsylvania Department of Environmental Protection (PADEP) were involved in the oversight of this project. The site contained approximately 350 million pounds of heavy metal impacted waste insulation material, commonly known as fluff, in a 12-acre open pile on a 20-acre site. The clean-up activities included the following:

Rerouted on-site access road to a waste water treatment plant
Relocated above-ground utilities underground
Removal of fluff material from wetlands areas
Reshaping of the fluff pile
Installing a drainage system under the area to be capped and connecting to the on-site waste water treatment system
Isolation and containment of contaminates within the fluff pile with a multi-layered impermeable cap
Installing a drainage system to divert water off of the cap and into designated drainage ditches

After the impermeable cap was complete, gabions and reno mattresses were installed and the wetlands were restored with several thousand herbaceous plugs, live stakes, trees and shrubs.

Wire insulation fluff (finely graded grey material)

Installation of impermeable HDPE liner for landfill cap

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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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Pleasantville, NJ

Time Frame: July 2017 - December 2017

Enviro-Air was contracted to demolish two industrial buildings on the corner of an extremely busy street that was part of an old MGP site. EAT contracted an asbestos abatement contractor to remove asbestos pipe wrap, floor tiles and roofing materials. After the removal of the asbestos containing materials, interior piping and other metals were removed and shipped off-site for recycling. Over (50) 100-yard walking floor trailers of debris were loaded and shipped to a local landfill for disposal.

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Phillipsburg, NJ

Time Frame: September 2018 - February 2019

Enviro-Air was contracted to excavate and remove contaminated soil to a depth of 48 feet below ground level. In addition, EAT was required to excavate foundry sand from a 3-acre area and use that material as backfill in the excavation. A small TSCA PCB area was excavated, transported and disposed of at a hazardous waste factility. In addition, 12,000 tons of impacted soil were shipped to a Pennsylvania landfill. After the excavation was filled with the foundry sand, it was capped, and the entire 3 acres site was restored.

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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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Sea Isle City, NJ

Time Frame: September 2013 - May 2014

EAT was contracted to excavate, transport, and dispose of 16,000 tons of MGP impacted soil from 3 residential properties located on the barrier island of Sea Isle City, NJ. The project involved the following:

Demolition of 3 residential properties
Driving 33,250 square feet of steel sheet piling to create (16) individual excavation cells
Excavation dewatering
Onsite water treatment and discharge
Construction of a 118′ X 164′ temporary enclosure, which utilized two air scrubbers
Stabilization of saturated MGP-impacted soil
Site Restoration

EAT completed the project on time and with no safety incidents.

Excavation of impacted soil from one of 16 cells created with sheet piling

Mini excavator was lowered into a cell to ensure all impacted soil was removed

Triaxle dumped clean sandy backfill into a finished excavation cell

Temporary enclosure was moved to enclose additional excavation areas

Triaxle trucks loaded with impacted soil

Clean sandy backfill placed by skid steer

Trench roller was utilized to compact clean sandy backfill in lifts

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Mount Joy, PA

Time Frame: April - September 2015

EAT was contracted to demolish a residential home and gas regulator station to facilitate the removal of a tar separator as well as other subsurface MGP structures. As the site was located in a residential area, it was necessary for Enviro-Air to construct a temporary building over the top of the subsurface MGP structures and excavate the MGP-impacted soil inside the enclosure. The temporary enclosure was equipped with a carbon absorber and air scrubbing system. The atmosphere inside the building was maintained under negative pressure to contain and scrub the vapors. EAT excavated and disposed of over 4,000 tons of MGP impacted soil. During the project, Enviro-Air was responsible for dewatering. This was a very difficult project in that access was limited and a residential home was adjacent to the site. EAT completed the project with no incidents. In 2017, Environmental-Air returned to the remediated site to construct a park, later named Old Standby Park. EAT worked closely with the Borough of Mount Joy to create the park in accordance with their requests. The park construction included the following: