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III. Environmental Setting, Impacts, and Mitigations g P g G. Air Quality (b) Design and implement a landfill gas recovery system to ensure efficient destruction of odoriferous substances, and to ensure that there are no major odor leaks to the atmosphere. (c) Ensure that loading,unloading,and material handling activities are carried out efficiently and without delays to avoid excessive odors. (d) Apply daily cover over odorous materials as soon as possible. Implementation of the mitigation measures described above would reduce this impact to a less- than-significant level. Off-Site Impacts Impact G.6. The project,by extending the time the current number of vehicles trips travel to and from the site,would result in an increase in criteria air pollutant emissions. (ADVERSE) The project would result in about 220 vehicle daily trip ends. Table III.G.2 includes an estimate of project-generated criteria air pollutants from motor vehicle emissions,including a comparison with projected county-wide emission totals. The peak-hour traffic volume would be about 30 trips during the morning. Most of these trips would be trucks, with a few employee trips. While cars are major sources of CO emissions,trucks generally emit NOx and HC,but not substantial quantities of CO. As shown in Table III.G.2, vehicular emissions would be relatively minimal when compared with regional County-wide emission totals. Traffic would not increase substantially should soil import be required and thus,this would not increase vehicular emissions substantially. CO concentrations build up at crowded/congested intersections and heavily travelled roadways, and depending on the traffic volume,cause the violation of ambient CO standards. The relatively low number of project-generated peak-hour vehicles(30 trips/hour)would not be sufficient to generate substantial amounts of CO on their own. Given that the access roads are not heavily travelled (63 trips/hour at a speed of 35 mph or more),and that trucks(which constitute the majority of peak-hour vehicles) are not considered major emitters of CO,the project would not have a significant effect on ambient CO concentrations. If the landfill were not to continue to accept wastes,then the waste would have to be hauled to other landfills,which could result in a net increase in total vehicle-miles travelled. Depending on the relative change in.total vehicle miles travelled by haul trips,the project would add or reduce III.G.17