06 16 20 PWA_02_02 Exh2 - IS-MND

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INITIAL STUDY/MITIGATED NEGATIVE DECLARATION FAIRVIEw BRIDGE REPLACEMENT AND STREET IMPROVEMENTS w MAY 2020 (9TH STREET TO 16TH STREET) PROJECT `J" SANTA ANA. CALIFORNIA then permanently relocated to the new bridge, which could halt water service for approximately 3 hours. Although standard construction procedures would be employed to avoid accidents or excessive disruptions to water service, there is a potential for an extended loss of water service. Any relocation of water facilities would occur during the construction phase such that water services are permanently maintained. To avoid any significant impacts to water service or other utilities during the construction phase, coordination with utility providers and completion of an updated utility search to determine utility conflicts that would require protection in -place or relocation are necessary. Any modifications to utility facilities are required to be coordinated with the applicable utility provider to minimize the risk of disruption of services and damage to the facilities, to ensure advance notification of any temporary service disruptions to the public, and to protect the safety of the construction workers and the general public. These requirements are specified in Mitigation Measures UTL-1 and UTL-2. Therefore, with implementation of Mitigation Measures UTL-1 and UTL-2, the relocation or construction of new water facilities would not cause significant environmental effects. The proposed Project would not result in any new land uses that would consume water or generate wastewater. Water would be used during construction to reduce fugitive dust in compliance with SCAQMD Rules 402 and 403 and during operation for landscape irrigation. Landscaping would include native trees and low -water -use shrubs along Fairview Street, which would not demand a substantial increase in water used for irrigation in comparison to existing conditions in the Project area. The amount of water used during construction and operation would be minimal, and water use during construction would cease when construction is completed. No wastewater would be generated as a result of construction or operation of the proposed Project. Stormwater Drainage. The proposed Project would improve the river hydraulics upstream of the bridge by lowering the water surface elevation and reducing the length of the subcritical flows by approximately 300 ft. Therefore, implementation of the proposed Project would have a beneficial effect on the flood control functions of the surface waters upstream of the Project area. A 60-inch storm drain exists from 17th Street to the northwest corner of the bridge, which has an outlet and drains into the Santa Ana River. However, the proposed Project would avoid impacting the storm drain outlet into the Santa Ana River. Additionally, the proposed Project would maintain the overall drainage patterns in the Project area and would not substantially increase the rate or amount of surface runoff in a manner that would result in on -site or off -site flooding. Therefore, the proposed Project would not result in the need for new storm water drainage facilities or the expansion of existing facilities. Electric Power and Natural Gas. As discussed in Response 3.6.2(a), energy usage on the Project site during construction would be temporary in nature and would be relatively small in comparison to available energy sources. Once operational, the proposed Project would not require the consumption of natural gas. Electric power associated with the proposed Project would only be associated with minimal electricity consumption associated with lighting along the Project segment. As such, implementation of the proposed Project would not result in a long-term substantial demand for electric power and natural gas. However, there is the potential for relocation of one or more utility poles along the Project alignment. Any R:\WKE1702\ISMND\Final ISMND\Fairview Street Bridge Final ISMND.docx (05/26/20) 3-107