Soil Cleanup Under Tents

Many of the remaining cleanup activities at the site (soil solidification, stockpile management, and earth moving) will be conducted under tents to reduce emissions into the air as much as possible. These large, specialized structures will be fitted with air handling equipment that allow for work to be safely conducted within them.

Tent Movement

  • Two tents will move across the site over the treatment areas. When treatment has been finished in an area, the tent will be moved by crane to the next area.
  • Because of physical interferences and safety, approximately 10 percent of the remaining area to be treated will be performed outside of a tent. Vapor mitigation techniques (see below) will be used in these un-tented areas of soil solidification.

Tent Locations
Tent locations are approximate. Sequencing for tent movement across the site is subject to change.

Air Treatment for Tents

  • Air is pulled out of the tent for treatment in large external carbon units.
  • Treated air is released above the ground through a stack on the carbon unit.
  • Eventually, carbon inside the unit has absorbed all the contaminants it can and needs to be replaced.
  • Air in the tent is replaced approximately 6 times per hour for proper ventilation and safety.
  • Technicians monitor air emissions from the stand and sample air inside the unit to determine when carbon needs to be replaced.
  • Carbon treatment is expected to be more than 95% effective in removing site-related airborne contaminants before release through the stack.
  • Workers will wear personal protective gear such as respirators inside the tents at the start of the project and periodically if needed.
  • Work is being completed in accordance with a New Jersey Department of Environmental Protection (NJDEP) air permit equivalency. To confirm that emissions meet the NJDEP's requirements, VOC emissions from the carbon units will be sampled three times - 1) during the first month of operation, 2) when working in a highly-contaminated area, 3) when carbon in the unit has absorbed at least 50% of the contaminants it can contain. Laboratory results will be posted here.

Tent Photos

Air Monitoring

During the work under the tents, Honeywell, with EPA oversight, is continuing to implement an air monitoring program.

Vapor Mitigation for Work Outside Tents

Vapor mitigation techniques will be used for soil solidification activities outside tents. These mitigation measures include:

  • Minimize area of disturbed soil - Excavated areas will be kept small (20 feet by 20 feet), completed, and covered with gravel before work moves to the next location.
  • Odor suppression foam (Rusmar) - A non-toxic foam is sprayed on exposed soil liberally and proactively to suppress odors.
  • Posi-Shell - Posi-shell is a natural clay-based mortar more durable than foam that is sprayed continuously to manage odors and at the end of each work day. Portland cement is mixed in to help it set up faster and increase the effectiveness of the spray.
  • Perimeter misters - Mist generators are installed along perimeter fences for use as needed. Misters cannot be used during freezing temperatures.
  • Plastic poly sheeting - When appropriate and safe for workers, plastic sheeting is used to cover stockpiles. Sand bags will be used to secure the plastic sheeting.