Landfill Gas Treatment System
Contractors started work in June 1998 on a landfill gas abatement system. This is designed to remove dangerous methane gas from underneath the landfill. Since the system was initially put in place, workers have added to it. The system is still working and is monitored weekly.
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If you're interested in the technical details of this system, please continue:
- Due to subsurface landfill gas levels at the property perimeter exceeding 5 percent methane (methane is explosive between 5 and 15 percent) and pursuant to an EPA AOC dated September 10, 1998, VRAC contractors initiated work on the installation of a perimeter landfill gas abatement system (LGAS) in June 1998. Seven perimeter LGAS extraction systems have been installed (along the northern, eastern, southern, and southeastern site perimeters) and manifolded into an enclosed flare.
- In the fall of 2001, VRAC contractors installed additional extraction wells in Area 2 due to methane levels above 5 percent at the perimeter. The extraction well piping was manifolded into the enclosed flare. In addition, VRAC contractors installed a barrier liner in Area 2 to block methane from migrating off site.
- In the fall of 2002, VRAC contractors installed two additional extraction wells by TGP-76 to prevent methane migration. (TGP-76 is a compliance gas probe southeast of Area 5 and at the northern portion of Valleycrest Drive. It was a probe that went out of compliance for methane but since been corrected with the addition of 2 extraction wells to the LGAS system.)
- In October 2002, VRAC contractors conducted a second emission stack testing event of the enclosed flare. The LGAS is operated on a daily basis (currently 4 cycles3 hours on' and 3 hours off') and monitored on a weekly basis.
- EPA received the draft LGAS Operations and Maintenance Manual from
the VRAC on January 30, 2003. EPA is currently reviewing the draft manual.