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III. Environmental Setting,Impacts, and Mitigations <br /> G. Air Quality <br /> emissions from the smaller Class III Austin Road Landfill would likely not have significant <br /> health effects. <br /> Mitigation Measure GA. <br /> None warranted. <br /> Impact G.5. Landfill wastes would generate objectionable odors. (SIGNIFICANT) <br /> Municipal waste is a source of objectionable odors,as decomposing wastes create landfill gases <br /> (including hydrogen sulfide)that can result in unpleasant olfactory sensations. The predominant <br /> west-northwesterly winds in the region would result in the proposed project being upwind of the <br /> closest sensitive receptor,the residence at 9690 Austin Road, approximately 1,700 feet southeast <br /> of the current landfill. During winter,however,prevailing winds are from the southeast <br /> (33 percent of the time),and the proposed project would be upwind of the CYA(California Air <br /> Resources Board, 1989). Prevailing winds could thus result in the exposure of sensitive <br /> receptors to objectionable odors. <br /> There is no comprehensive gas collection and disposal system to effectively remove the presence <br /> of odorous substances; currently gas is collected from only half of the landfill area. Expanding <br /> the landfill area would increase the area from which gas is not collected. This creates the <br /> potential for objectionable odorous effects nearby sensitive land uses. New regulations would <br /> require gas collection and disposal systems, but it is not known how soon such a system would <br /> be in place. Nearby sensitive receptors could be exposed to unpleasant odors in the mean time. <br /> Because of the potential to generate unpleasant odors at a nearby sensitive receptor location,the <br /> project is considered to have a significant impact. <br /> Mitigation Measures GS. <br /> Identified by this EIR <br /> The following measures are suggested to reduce potential odors from the landfill: <br /> a Mix excessive] odorous wastes immediate) with other landfill wastes depending on their <br /> ( ) Y Y � Pe g <br /> nature and source. If diluting the intensity of odor is not sufficient,then immediately cover <br /> offensive material as soon as they arrive at the landfill. <br /> III.G.16 <br />