3_Exhibit C_ADDENDUM ONLY - Laserfiche WebLink

City of Pleasanton—Stoneridge Mall Residential Project CEQA Checklist Section 15183 Checklist/15164 Addendum 70 FirstCarbon Solutions Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480017/Consistency Checklist/21480017 Stoneridge Mall Residential Project Checklist Addendum_Updated.docx Nonetheless, CO hotspots can still occur when a transportation facility’s design or orientation prevents the adequate dispersion of CO emissions from vehicles, resulting in the accumulation of local CO concentrations. The design or orientation of a transportation facility that may prevent the dispersion of CO emissions include tunnels, parking garages, bridge underpasses, natural or urban canyons, below-grade roadways, or other features where vertical or horizontal atmospheric mixing is substantially limited. The proposed project would not include any of these types of facilities. Finally, the proposed project would not result in any significant impacts related to transportation. As discussed in further detail in Transportation Section, all studied roadway segments and intersections would operate under applicable City and Alameda County Transportation Commission (ACTC) thresholds in combination with the proposed project vehicle trips and existing traffic levels. The proposed project is estimated to generate 1,710 daily trips, 113 trips in the AM peak-hour (63 In/50 Out), and 104 trips in the PM peak-hour (45 In/59 Out). Thus, the proposed project would be consistent with the approved 2012 Housing Element and LOS standards. Therefore, based on the above criteria, the proposed project would not exceed the CO screening criteria and would have a less than significant impact related to CO. Therefore, there are no environmental effects that are peculiar to the proposed project or the parcels on which the proposed project would be located. Impacts would be less than significant and the proposed project would not result in a new or more severe adverse impact that was not previously identified in the Prior EIR. c) Sensitive Receptors Prior EIR Conclusions The Prior EIR concluded that development facilitated by the General Plan Amendment and Rezonings could potentially include residential or mixed-use developments that could expose sensitive receptors to substantial health risk from diesel particulate matter (DPM) and other TACs from mobile and stationary sources. However, that analysis identified that with implementation of the Prior EIR MM 4.B-4, Reduce Exposure to TACs, the impacts could be reduced to less than significant. Analysis of Proposed Project Construction Toxic Air Contaminants Generation As discussed in the BAAQMD’s Air Quality Guidelines, construction activity using diesel-powered equipment emits DPM, a known carcinogen. A 10-year research program demonstrated that DPM from diesel-fueled engines is a human carcinogen and that chronic (long-term) inhalation exposure to DPM poses a chronic health risk.31 The California Office of Environmental Health Hazard Assessment (OEHHA) and ARB developed recommended methods for conducting Health Risk Assessments (HRAs). The majority of heavy diesel equipment usage would occur during the grading phase of construction, which would occur over a brief duration. Nearby sensitive receptors that surround the project site would be exposed to construction contaminants only for the duration of construction. This brief exposure period would substantially limit exposure to hazardous emissions. 31 California Air Resources Board (ARB). 1998. Proposed Identification of Diesel Exhaust as a Toxic Air Contaminant.