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7.5 LANDFILL GAS MONITORING AND MANAGEMENT PLAN State and federal regulations require the control of landfill gas to prevent it from migrating away from the landfill boundaries and accumulating in off-site structures. In addition, local air pollution control districts, and State and federal air quality regulations require the control of landfill gas emissions into the atmosphere. 7.5.1 LANDFILL GAS MANAGEMENT As organic wastes within a refuse prism decompose, landfill.gas as generated initially through aerobic and finally anaerobic processes. Landfill gas generated through the anaerobic process typically consists of,equal, rats of ra "'e and carbon dioxide, as well as a trace amount of other constituents.- The production of landfill gas within the refuse prism is of interest to the regulatory community as the methane component at 50 percent concentration is flammable when diluted in air (5 and 15 percent by volume) and due to the presence of hazardous air pollutants (HAPs) carried with thre°gaas.- Locai,-state and federal regulations require the installation of a landfill Fas extraction system (LFGES) to collect and control landfill gas and prevent it from migrating beyond the landfill boundaries, accumulating in off-site structures, and to prevent the emission of HAPS into the atmosphere. The objectives of the required landfill gas extraction system are to provide for the protection of public health and safety and the environment. One objective of the proposed active LFGES is to prevent offsite migration of LFG and infiltration into structures and/or public access areas in excess of 25 percent of the lower explosive limit (LEL), or a methane concentration of 1.25 percent by volume, in air, as required by Article 6 of 27 CCR. Another objective of the LFGES is to prevent the emission of HAPs into the atmosphere. Such emissions may cause serious health risks to the public, as described in the applicable rules and regulations. These regulations require the implementation of a rigorous monitoring program of landfill surface emissions. Currently, the most stringent applicable regulations require that LFG surface emissions be limited to 500 parts per million by volume (ppmv) when measured as methane. These regulations also require the installation of a LFGES and control device for the removal of HAPs prior to discharge into the atmosphere. Forward Landfill JTD 7-11 L:\Allied\2000.193\Reports\fiinaljtd:Sec-7.0:08/20/01 BRYAN A.STIRRAT S ASSOCIATES