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24-lairurs per day for 3i,5 days leer vt.1ar. Thi" reprc=�c,nt�, nl;i,t,?U hours of exposure. Landfill equipment emits diesel exhaust particulates, as do manv o3 the "packer trucks" disposing refuse. Calculation of any previously undisclosed health risk is not feasible, however, because of the following considerations: 1. Programs for dramatic diesel exhaust particulate reduction are being developed that v,tll change diesel emission characteristics within the next decade, 2. The landfill does not have a 70-year estimated life, 3. The landfill is not active 24 hours per day, 4. People do not live oil their front porches for their entire lifeti.nies. There is therefore a non-zero health risk associated \with diene€ exhaust particulate matter from on-site heavv equipment and from trucks visiting the site. The magnitude is small and not quantifiable based on existin- information. It is not believed to be significant based upon mandatory programs to reduce such emissions to the naaxi.naum extent feasible within the next ten nears. b. Less than Significant Impact: Rules of the SJVAPCD preclude issuing a permit for any sources that would cause clean air Standards to be violated, or tlatrse that would substantially exacerbate existing violations. Non-permitted (fugitive) sources of dust and odor will be mitigated by previously adopted mitigation measures. Potentially Si nificarat Ina iact: As described in the 1�14i-i FII:, the project would contribute C. g } to cumulatively significant and unraaitigable regitrnal air quality impacts. d. No Impact: No sensitive receptors would be exposed to substantial levels of pollutants with ambient air quality standards ('criteria pt}Jlutants"), or to toxic air contaminants for which there are no established safe exposures. e. Less than Significant Impact: Odor iaaapacts would be. kept to less than significant levels by incorporated measures to operate an effective LFG collection/disposal system and to conduct activities at the working tate of the landfill in such a +,vav as to nainianize "fresh trash" odor during; the initial dumping and covering process. IV. BIOLOGICAL RESOURCES a. Potentially Significant Impact: The proposed landfill expans.son could have a substantial adverse effect on sensitive species. This issue.is analyzed in the Supplemental E1R. b. Potentially Significant Impact: The proposed landfill expansion could have a substantial adverse effect on riparian habitat. This issue is analyzed in the Supplemental FIR. c. Potentially Significant Impact: The proposed project could have a substantial adverse effect nn wetlands associated with the North Fork of the South Branch of Little Johns Creek. This issue is analyzed in the Supplemental FIR. d. Potentially Significant impact: The proposed .landfill expansion could interfere with