Updated November 20, 2018


About the Site Remediation


What is the extent of impacts to be remediated?

The entire 32-acre site housed the former manufactured gas plant and related operations. As a result, the impacts extend across a substantial portion of the Site.


What are the contaminants?

The source of the MGP materials is the former MGP operations. Some by-products of the gas manufacturing process, including coal tar residues and oils, are found in the soil and groundwater at and in the vicinity of the site. Compounds of concern present in coal tar and oils include benzene, toluene, ethylbenzene and xylene(s) (or BTEX), naphthalene, and polycyclic aromatic hydrocarbons (or PAHs).


What remediation work has been completed to date?

In 2004-2005, a River Front Remediation was conducted between the Site and the Passaic River to address migration of Site contaminants in the overburden. In 2018, a pilot project, focused on remediating 1.8 acres of the 32-acre site, was successfully completed. The remaining portions of the Site still need to be addressed.


Are future phases of remediation planned?

Yes. Based on the findings and results of the 2018 pilot project, the Remedial Action Work Plan for the remainder of the Site is being finalized and planning for future remediation is underway.

There are many remedies for addressing environmental contamination that are accepted by NJDEP. The Harrison former MGP Site will be addressed through the use of a combination of several different remedies..


The project team will communicate the details of these plans, once finalized, to PSE&G management and employees using the Site, representatives of the Town of Harrison, and nearby neighbors.

The next phase of work is currently expected to begin in late 2019.


Is NJDEP supervising the work?

In 2012, NJDEP fully implemented the Licensed Site Remediation Professional (LSRP) program. LSRPs provide guidance and oversight to ensure projects like this are performed in accordance with state regulations. Each work plan is reviewed and approved by the LSRP, then submitted to NJDEP.


After each phase of work is completed, PSE&G develops a report documenting its actions. The report is reviewed and approved by the LSRP and submitted to the NJDEP.


Who is responsible for the remediation of the MGP Site?

PSE&G is the responsible party.


About the Pilot Project Remedy


Why was the work considered a pilot study?

The purpose of the pilot study was to determine which mixture of stabilizing agents used in the ISS process best achieved the remedial objectives to support decision making on how best to remediate the remainder of the Site. Three mixtures were tested by the pilot program and borings to date indicate ISS worked as designed. .


What is In Situ Stabilization Solidification (ISS)?

It is a proven environmental remediation process that involves mixing of contaminated soil in place with stabilizing agents, such as Portland cement and blast furnace slag. It solidifies the soil below ground.


How will you know if the pilot study was successful?

The success of the ISS remedy is determined by taking cylinder samples as the mixture cures, and assessing whether the stabilized soils meets the minimum strength, maximum hydraulic conductivity, and leachability guidance per the Development of Performance Specification for Solidification and Stabilization established by Interstate Technology & Regulatory Council. Testing to date has determined the process worked as designed.


Why did you choose the middle of the site for your pilot study?

The location of the 1.8 acres pilot study area was deliberately chosen based on both soil sampling results and the overall Site’s use and layout. Some of the most significant impacts were in the study area, so if the process is successful in the study area it will most likely also be successful addressing other areas of the property. Additionally, no active gas lines, or other utilities, crossed through the study area.


I was here when steel sheeting was installed along the River Front. Why is this current work necessary?

In 2004-2005, a River Front Remediation was conducted between the Site and the Passaic River to address migration of Site contaminants in the overburden. The interior of the Site still needs to be addressed.


Dust Management and Air Monitoring


Does PSE&G control dust during remediation?

Yes. Dust control measures such as water misting and foaming are performed as needed during soil intrusive work.


Are odors associated with the remediation work?

Soils containing MGP-related materials sometimes have an odor similar to that of mothballs. These odors can be detected by the human nose at levels below what can be detected by an air monitoring instrument and well below what would be considered a health concern. Dust and odor control measures (such as water mist, foam spray, plastic sheeting and sand cover) are commonly used to control potential dust and odors during excavation and non-work periods.


During the pilot project, additional steps were taken to mitigate odors encountered in some areas where the former plant’s holding tanks were found. The contractor and oversight engineering firm applied odor suppressant foams every two hours, or more frequently as needed, and used a neutralizing drip system along the perimeter of the work area. A surfactant, Biosolve Pinkwater, also was used as an additional vapor suppression product.


Additionally, odor assessments were performed at least twice daily, or more frequently as required, to identify and manage observed odors at the source before they travelled off site.


What is the foam and what is in it?

The foam being used at the project site is made from a Rusmar brand foam concentrate, specifically Rusmar formulas AC645 and AC900. Both serve to form a barrier between contaminants and the atmosphere and are applied either during or after active excavation to provide an immediate and effective barrier to vapors and help to minimize odors. Both are completely biodegradable. Neither formula has an inherent odor; however, a wintergreen or vanilla scent is added.


Rusmar AC-645: http://www.rusmarinc.com/_assets/img/PDFs/new/AC-645-RusFoamOC-MSDS.pdf

Rusmar AC-900: http://www.rusmarinc.com/_assets/img/PDFs/new/AC-900-RusFoam-LM-MSDS.pdf


In addition, Biosolve Pinkwater, a surfactant, was used as an additional vapor suppression product: https://biosolve.com/sites/default/files/SDS%20BioSolve%20Pinkwater%202016R.pdf



Is air monitoring performed?

Yes. An air monitoring plan specific to the site’s activity and constituents of concern is developed for each phase of work. Air monitors are installed along all sides of the work area perimeter and between the project area and the closest building when remediation work is being performed. The stations are closely monitored to ensure that we stay below health-based action levels. A summary of air monitoring results are posted to this website after results are confirmed by an independent laboratory.


What do the air monitors do?

The air monitoring stations house two monitoring devices that will operate continuously during active work hours. One device is a photoionization detector (PID), which is a type of vapor detector. It monitors and records total volatile organic compounds (TVOCs). The other device is a real-time particulate matter meter that monitors for dust.


Where were the air monitors stationed?

When remediation work is performed, there are always a minimum of four air monitoring stations. One monitoring station is located along each of the north, east, south and west sides of the work area perimeter. For the pilot project, up to 6 air monitors were used, including two mobile stations in order to correct for prevailing wind direction. With the pilot project completed, the air monitors have been removed until the next phase.


Were the air samples tested for chlorinated compounds?

Yes, because they are automatically included in the full suite of VOCs. However, chlorinated compounds are not a constituent of concern related to MGP sites, and neither background air sampling, nor soil sampling, nor groundwater sampling has identified chlorinated compound contamination within the ISS pilot study area.


Will air monitoring be performed when work is not being done?

We will perform air monitoring only while our remediation work is being performed.


How quickly do you get air monitoring results?

While remediation is being performed, perimeter air monitoring equipment provides real-time readings, continually measuring and recording TVOCs and PM-100 to the project team during work hours.


Additionally, a confirmatory air sample is collected weekly during remediation activities and sent for analysis at a New Jersey certified laboratory. These results are expected within three weeks of the collection date.


The Air Monitoring page on the website provides only data for Benzene and Naphthalene. Are they the only contaminants you monitor?

No. In accordance with the Perimeter Air Monitoring Plan, air samples are analyzed for the full suite of volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs) and metals.


If levels for Benzene and Naphthalene are below the PAMP action level, then there is no indication that any of the remaining contaminants are at risk of exceeding the residential health-based standards. These contaminants are tracked and can be provided by request.


Who do I call if I have a concern?

If you have a more general question, we encourage you to call the Project Information Line at (855) 356-2383 or email the team at comments@HarrisonMGP.com. Kelly Henry is the community liaison working on behalf of PSE&G for the project and will be the first person to respond to your call or email.


Future Use of Site


What is the future use of the PSE&G property?

The PSE&G Site Remediation Group is not aware of any immediate plans to alter the property’s current use.


Will the remedy impact any future development on the property?

No. The remedy will not prevent future development of the Site.