Sep 03

Weekly Update September 6, 2021

PSE&G Former Harrison MGP Site: Weekly Project Update – Week of 9/6/21

The PSE&G site remediation group and its environmental contractor, Sevenson Environmental Services, Inc., are conducting activities to remediate soils at the Harrison former Manufactured Gas Plant (MGP) site. Work began in July 2020 and is expected to be completed in mid-2022. 

These updates are being issued weekly throughout the duration of the project to provide a review of key activities performed at the site over the past week as well as a look ahead to the next week’s anticipated activities. They are also posted to the project website: www.HarrisonMGP.com where more information about the project scope and history can be found. If you have any questions or concerns about the project, please call the PSE&G Harrison Project Information Line at (855) 356-2383 or email us at comments@harrisonMGP.com.


  • Stormwater – The rain and flooding from the remnants of Hurricane Ida require PSE&G’s environmental contractor to pump and treat onsite water 24 hours a day at least through the morning of Saturday, September 11, 2021. This work will require onsite electric generators, which are enclosed to dampen sound, to run 24 hours a day. The limited work area will be lit by temporary light towers to ensure safe working conditions for a three-person crew.
  • Holiday Weekend – Except for stormwater pumping, the remediation project will be closed September 4-6, 2021 for the Labor Day Holiday weekend. The project site will be secured for the weekend and long-term foam will be applied to areas under remediation. Work will resume Tuesday, September 7, 2021.
  • North Gate – All access to the PSE&G Harrison Site is through the North Gate. Onsite signs will direct vehicles to the M&R Station, Appliance Service Building and construction areas.

Anticipated Work for the Week of September 7 – September 10

Remediation Activities – (See Figure 1 below and on the website)

  • Continue pumping to remove onsite stormwater. This work will be performed 24 hours a day in accordance with the project’s permits. 
  • Continue to pre-clear Phase 2 area 1B, 2A, 2B, and 4B for In Situ Stabilization (ISS) work and within a utility corridor. This work will generate sounds from breaking of concrete and removal of metal piping and other materials.   
  • Continue ISS work in areas 1A and 2B. 
  • Continue to backfill and compact clean fill in completed areas with intermittent use of vibratory rollers.
  • Perform soft dig to locate underground utilities and cut and cap unused utilities.
  • Transport excavated soil and concrete by trucks for disposal or recycling at a licensed facility.
  • Operate temporary wastewater treatment facility to control groundwater and surface water accumulations during work activities. Treated water is discharged in accordance with a permit issued by the Passaic Valley Sewerage Commission. 
  • Maintain soil and sediment erosion controls. 
  • Maintain temporary fencing around active work areas.
  • Commence installation of the replacement gas mains. 

Continue Monitoring & Mitigation Measures

  • Apply dust suppression and odor controls, as needed, during remediation activities. 
  • Continue vibration monitoring between remedial work and the nearest onsite buildings.
  • Continue to perform perimeter air monitoring. 
  • Maintain site security 24 hours a day, 7 days a week.

NOTE:  Odors associated with some constituents can often be detected at levels that are well below what would be considered a health concern and often below what can be detected by an air monitoring instrument. The MGP project continues to:

  • Apply vapor mitigation sprays in the excavation area.
  • Apply odor suppressing foams in the excavation area and in the trucks while being loaded.
    • Short-term odor suppressing foam is white in color when applied. 
    • Long-term odor suppressing foam is black in color when applied and dries to a dark gray or black color with a shiny appearance. 
  • Use odor suppressing foams more frequently and in greater amounts.
  • Cover project soil piles with plastic when work is completed.
  • Perform daily odor assessment walks around the MGP remediation work areas to determine if and at what levels odors may be detected beyond the work area fence line. 

Other control measures, including water mist and sand, will be used as needed to control potential dust and odors during excavation and non-work periods, including evenings and weekends. The MGP project performs continuous air monitoring during working hours around the site. Confirmatory air samples are taken weekly and all results have been below our action levels. 


  • Demolition of the storeroom may begin.

Work Completed August 30 – September 3 

Remediation Activities

  • Managed and treated onsite stormwater from Tropical Storm Ida.  This work was performed 24 hours a day in accordance with the project’s permits. 
  • Backfilled and compacted clean fill in completed areas.
  • Continued ISS work in area 2B. 
  • Mobilized remediation equipment and personnel to the project site as needed.
  • Installed and maintained additional soil and sediment erosion controls. 
  • Maintained temporary fencing around active work areas.

Monitoring & Mitigation Measures

  • Applied dust suppression and odor controls during pre-trenching and clearing activities. 
  • Continued vibration monitoring between remedial work and the nearest onsite buildings.
  • Continued to perform perimeter air monitoring when soil disturbance work was in progress. 
  • Maintained site security 24 hours a day, 7 days a week.


  • Demolition of the machine shop and removal of material to a licensed facility.

Community Outreach 

  • Provided notice to apartment managers of Vermella, Steel Works and Cobalt Lofts of 24-hour dewatering due to Tropical Storm Ida.
  • Issued 57th weekly update email to representatives of the Town of Harrison, Hudson County Regional Health Commission, and property managers of Vermella, Steel Works, and Cobalt Lofts apartment complexes, as well as the owners of Joia Restaurant and officials of Amtrak.

The PSE&G remediation project team is committed to: conducting work safely on the job site; minimizing impacts from the project to those outside of the project area; keeping PSE&G non-project personnel, the local community, elected officials, and all interested parties informed of our progress; and enhancing the property’s continued productive use. The team will follow the guidelines and directives issued by the New Jersey Department of Health, the CDC and the Occupational Health and Safety Administration, as applicable, for maintaining a clean, safe and healthy work environment. PSE&G personnel and contractors are required to participate in social distancing and wear appropriate gloves and face coverings during all work activities

All work is being performed in accordance with the guidance and regulations of the New Jersey Department of Environmental Protection (NJDEP), and under the oversight of the Licensed Site Remediation Professional (LSRP) of record. 

FIGURE 1 – Status of Phase 2: Pre-Clearing, Excavation, ISS Stages