|A Case Study Demonstrating U.S. EPA Guidance for Evaluating Landfill Gas Emissions From Closed or Abandoned Facilities, Somersworth Sanitary Landfill, Somersworth, New Hampshire (EPA/600/R-05/142) October 2005
This report describes a case study that applies EPA’s guidance for conducting air pathway analysis of landfill gas emissions. The guidance is of interest to Superfund remedial project managers, on-scene coordinators, facility owners, and potentially responsible parties. The site examined was the Somersworth Sanitary Landfill in Somersworth, New Hampshire.
The case study exemplifies the use of the procedures and tools described in the guidance for evaluating landfill gas emissions to ambient air. The air pathway analysis is used to evaluate the inhalation risks to off-site receptors, as well as the hazards of both on-site and off-site methane explosions and landfill fires.
Landfill gases detected at the site were methane and chemicals of particular concern (COPCs), including nonmethane organic compounds, 1,1-dichloroethene, benzene, chlorobenzene, chloroethane, 1,4-dichlorobenzene, methylene chloride, toluene, trichloroethene, vinyl chloride, and xylenes.
The report includes values of 90th percentile concentration of COPCs and isopleths of the COPCs overlaid on an aerial photograph of the site.
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