Environmental Declaration WPCP 20240409

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3. Environmental Checklist The channel receives wet weather stormwater discharges from municipal sources and may receive some overflow from the ornamental irrigation ponds at Metropolitan Golf Links. During observations made at low tide, the channel receives no freshwater contributions during dry weather, and a flap gate controls wet weather discharges from Alameda County Flood Control District infrastructure, which receives municipal stormwater. San Leandro's Project will not influence the tidal channel in question. During construction, access to the constructed wetland area requires crossing a culvert through the tidal channel. A construction - phase buffer shall be defined by silt fencing in areas in proximity to the culvert, to minimize the likelihood of deposition of debris, waste, or other material into the channel. The WPCP shall consult with CDFW to evaluate the need for a Streambed Alteration Agreement. Construction- hase impacts to wetlands The tidal slough surrounding the outfall from the basin is considered federally protected wetlands. However, the Proposed Project has been designed to avoid in -water rehabilitation work on the outfall pipeline. An in -line gate valve shall be installed between the concrete vault box and the outfall from within developed areas to avoid impacts to wetlands or other waters of the United States. Further, these areas shall be excluded from the construction area and exclusionary fencing shall impede access during the construction phase (Mitigation Measure BIO-4). Therefore, Project construction would have a less -than -significant impact on wetlands or other waters associated with San Francisco Bay. Operation -phase im acts to wetlands Upon completion of construction, the Project will enable the discharge of tertiary -treated effluent through the existing outfall pipelines. As detailed in Section 3.11, Hydrology and Water Quality, the operation of the Project will improve nutrient removal, comply with existing waste discharge requirements, and not significantly degrade water quality. Impact Designation: Less than Significant d) Effects on migratory fish or wildlife: The Proposed Project site, part of the WPCP and an industrialized area, does not contain any terrestrial migratory wildlife corridors, migratory stopover sites, or native wildlife nursery sites. Consequently, no direct impacts to these biological resources are anticipated. The disturbances from rehabilitating and retrofitting the existing basin are both temporary and limited in scope, so they are unlikely to affect the movement of terrestrial species to or from nearby riparian, marsh, and tidal slough habitats. Given the industrial nature of the Project site, any wildlife species present in or around the site are likely already accustomed to a high level of disturbance. Thus, any temporary impacts arising from the Project are expected to be less than significant. Construction -phase Impacts to Fish No impacts on fish migration corridors are anticipated from construction -phase activities due to the implementation of the Proposed Project. The Project has been strategically designed to prevent any in - water work. Moreover, it does not involve the construction of any new infrastructure within the Bay, ensuring that no structural barriers to fish migration will be created by the Project. San Leandro Treatment Wetland February 2024 IS/MND