5A Public Hearings 2018 0507 - Laserfiche WebLink

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Environmental Checklist Hydrology and Water Quality Initial Study – Mitigated Negative Declaration 57 All stormwater runoff from the project would ultimately discharge into San Francisco Bay. The San Francisco Bay Regional Water Quality Control Board monitors surface water quality through implementation of the Water Quality Control Plan (Basin Plan) and designates beneficial uses for surface water bodies and groundwater. The beneficial uses for San Francisco Bay include industrial service supply, commercial and sport fishing, shellfish harvesting, estuarine habitat, fish migration, preservation of rare and endangered species, fish spawning, wildlife habitat, water contact recreation, water non-contact recreation, and navigation (San Leandro 2016f). Impact Analysis a. Would the project violate any water quality standards or waste discharge requirements? c. Would the project substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner that would result in substantial erosion or siltation on- or off-site?? f. Would the project otherwise substantially degrade water quality? Construction Impacts During construction of the project, existing buildings, equipment, concrete, and asphalt materials would be removed from the site. Grading of the site would also occur. During removal and grading activities, the site’s soils would be exposed to wind and water erosion that could transport sediments into local stormwater drainages. Also, accidental spills of fluids or fuels from construction vehicles and equipment, or miscellaneous construction materials and debris, could be mobilized and transported offsite in overland flow. These contaminant sources could degrade the water quality of receiving water bodies (i.e., the San Francisco Bay), potentially resulting in a violation of water quality standards. As part of Section 402 of the CWA, the U.S. Environmental Protection Agency (U.S. EPA) has established regulations under the National Pollution Discharge Elimination System (NPDES) program to control both construction and operation (occupancy) stormwater discharges. The federal CWA was first adopted in 1972 and is intended to protect and preserve water supply and quality in the “waters of the nation.” In the Bay Area, the San Francisco Regional Water Quality Control Board (RWQCB) administers the NPDES permitting program and is responsible for developing permitting requirements. The project would be subject to the San Francisco Bay Region Municipal Regional Stormwater National Pollutant Discharge Elimination System (NPDES) Permit (MRP) – NPDES Permit Order No. R2-2015-0049, and the provisions set forth in Section C.3 New Development and Redevelopment. Under the conditions of the permitting program, the applicant would be required to eliminate or reduce non-stormwater discharges to waters of the nation, develop and implement a SWPPP for construction activities, and perform inspections of the stormwater pollution prevention measures and control practices to ensure conformance with the site SWPPP. Because the project would disturb at least one acre of land, the project must provide stormwater treatment and would be required to obtain coverage under the General Permit for Discharges of Storm Water Associated with Construction Activity (Construction General Permit Order 2009-0009-DWQ or 2009-0009-DWQ General Permit). Further, in accordance with SLMC Section 7-12-230, the project applicant would be required to prepare and implement an erosion and sedimentation control plan and a drainage plan, which includes BMPs to minimize erosion and sediment runoff from the project site. The project would implement construction BMPs, including only performing earth moving activities during dry 354