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III. Environmental Setting, Impacts,and Mitigations <br /> L. Public Health and Safety <br /> currently at the landfill and collected by the gas control system,additional waste would increase <br /> the amount of landfill gas generation. <br /> The health and safety impacts of landfill gas are restricted to the flammable and explosive <br /> properties of methane. Carbon dioxide,the other major component of landfill gas,is a simple <br /> asphyxiant,it is nonflammable, nontoxic,and otherwise harmless. A gradual buildup of methane <br /> in buildings or beneath mobile structures is particularly hazardous; such a buildup could result in <br /> an explosion causing injury to personnel. Because the nearest sensitive receptot is located less <br /> than 500 feet from the edge of the proposed landfill footprint,there is a chance that off-site <br /> receptors could be affected by landfill gas. Landfill gas can also contain trace amounts of <br /> volatile toxic air contaminants such as benzene and vinyl chloride that enter the landfill with <br /> waste materials;this is a separate issue that is discussed in Section III.D., Air Quality. <br /> Mitigation Measure LA. <br /> Prosed as Part of the Project <br /> (a) A landfill gas monitoring system would be installed around the landfill. <br /> (b) The existing gas extraction system would continue to operate. <br /> Identified by this EIR <br /> (c) Gas accumulation in on-site buildings or beneath temporary buildings should be prevented <br /> by regular monitoring of building air,proper ventilation both within the buildings and <br /> under the slabs,subgrade membranes or gas collection devices, and spark-proof electrical <br /> systems. <br /> (d) The landfill operator should install an automatic combustible gas detection and alarm <br /> system for structures at the site. <br /> (e) The landfill operator should not construct or otherwise locate any structure in an area of <br /> known landfill gas buildup. <br /> (f) All site personnel who work in structures should be trained to use and respond to the <br /> landfill gas monitoring and alarm system. Documentation of such training should be <br /> placed in the administrative file. <br /> Application of the above measures would render Impact LA less than significant. <br /> III.L.19 <br />