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r <br /> Draft Supplemental Environmental Impact Report Page VIII-17 <br /> Forward Inc.Landfill 2018 Expansion Project <br /> The emission calculation method used in the AQIA is consistent with emission <br /> calculations for permitting and industry standard practice. In the professional <br /> judgement of SCS, it is the appropriate calculation method for the LFG flare and engine <br /> emissions in the AQIA. <br /> rB-8. The HRA results have been recalculated with a 70-year exposure duration(see <br /> Table 2, above). SCS notes that the use of a 70-year exposure duration would be <br /> expected to have little impact on the results of the HRA because the risk-driving sources <br /> (i.e. diesel engines)would not continue to operate beyond 30 years. Conservatively,SCS <br /> evaluated all emission sources as operating for the entire 70-year exposure duration. <br /> B-9. Comment Noted.The modeling has retained the additional receptors for use in the <br /> AAQS modeling and to provide additional information about health risk from the <br /> proposed Project. Only occupied residences are evaluated as HRA receptor sites. <br /> B-10. The HRA has been revised to include all on-site exhaust emissions in the modeled <br /> Project emissions,including construction emissions. Emissions from two cell- <br /> construction events and the creek construction have been added to the diesel exhaust <br /> emissions from the fill area and included in the revised HRA.Diesel exhaust emissions <br /> are a driver of carcinogenic risk, so the emissions from the two construction events have <br /> been averaged over the 70-year exposure duration for cancer risk. <br /> B-11. Estimates of dust emissions from the roadway have been added to the revised <br /> HRA. <br /> B-12. The results of the revised HRA are shown in Table 2, above.SCS notes that the <br /> Project risk is lower than presented in the AQIA.SCS believes this decrease is caused by <br /> the characterization of on-site truck emissions from the large area source to a series of <br /> volume sources and two point-sources as discussed in Response B-2. See Response B-5 <br /> for AAQS results discussion. <br /> r <br /> 1 <br /> r <br /> 1 <br /> r <br /> r <br />