06 16 20 PWA_02_02 Exh2 - IS-MND

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L w FAIRVIEw BRIDGE REPLACEMENT AND STREET IMPROVEMENTS INITIAL STUDY/MITIGATED NEGATIVE DECLARATION `J' (JTH STREET TO 16TH STREET) PROJECT MAY 2020 SANTA ANAL CALIFORNIA b. Would the project, due to slope, prevailing winds, and other factors, exacerbate wildfire risks, and thereby expose project occupants to pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire? No Impact. As stated previously, the Project area is not located in or near a VHFHSZ nor is it located in or near a State Responsibility Area. Therefore, the proposed Project would not exacerbate wildfire risks due to slope and prevailing winds, thereby exposing Project occupants to pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire. There would be no impact, and no mitigation is required. c. Would the project require the installation or maintenance of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment? No Impact. Utility modifications and the proposed roadway improvements would not exacerbate fire risk due to the location of the Project in an urban area outside of a designated fire hazard zone. Therefore, the proposed Project would not require the installation or maintenance of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines, or other utilities) that would exacerbate fire risk or result in temporary or ongoing impacts to the environment. There would be no impact, and no mitigation is required. d. Would the project expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, post fire slope instability, or drainage changes? No Impact. Landslides and other forms of mass wasting, including mud flows, debris flows, and soil slips, occur as soil moves downslope under the influence of gravity. Landslides are frequently triggered by intense rainfall or seismic shaking but can also occur as a result of erosion and downslope runoff caused by rain following a fire. As previously discussed in Response 3.7.2(a)(iv), the proposed Project would not introduce any new topographical features or elements that would increase the risk of landslide within the Project vicinity. Furthermore, as stated previously, the Project is not located in or near a VHFHSZ nor is it located in or near a State Responsibility Area. Therefore, the proposed Project would not expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, postfire slope instability, or drainage changes. There would be no impact, and no mitigation is required. 3-112 R:\WKE1702\ISMND\Final ISMND\Fairview Street Bridge Final ISMND.docx (05/26/20)