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Environmental Declaration WPCP 20240409
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Environmental Declaration WPCP 20240409
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5/15/2024 12:13:55 PM
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4/25/2024 1:12:37 PM
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CM City Clerk-City Council
Document Date (6)
4/9/2024
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Declaration
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2. Project Description <br />Recent WPCP Upgrades <br />Between 2011 and 2015, the WPCP constructed a major treatment plant rehabilitation to address aging <br />infrastructure and implement other improvements, including: <br />• Replaced the headworks, including a new screenings removal facility. <br />Constructed a new grit facility to increase wastewater treatment efficiency. <br />a Rehabilitated two (2) primary clarifiers and added a third primary clarifier to enhance wet weather <br />treatment capacity. <br />a Constructed a new Fixed Film Reactor and associated biofilter for odor control. <br />■ Constructed a new three -million -gallon lined storage lagoon for storage of wet weather flows. <br />a Upgraded the electrical system and constructed a new administrative and laboratory building. <br />Additional upgrades and investments made in the last decade to increase energy efficiency and plant <br />performance: <br />Installation of a new high efficiency 'turbo blower' to provide air to the activated sludge aeration basin, <br />significantly reducing energy consumption and operational performance. <br />Installation of a 1-megawatt solar array in a repurposed portion of the WPCP's sludge drying beds to <br />reduce energy consumption and help meet San Leandro's Climate Action Plan objectives. <br />2.3. Project Description <br />The Proposed Project involves installation of a modular nitrification system to convert ammonia, from existing <br />secondary treated wastewater, to nitrate, and converting a 6.9-acre wastewater retention pond to multi -benefit <br />treatment wetland. Nitrified effluent shall be polished in the treatment wetland for the removal of nutrients and <br />other pollutants prior to discharge to San Francisco Bay via an existing discharge pipe. <br />The design approach utilizes a hybrid system that includes both vegetated subsurface flow wetlands (terraced <br />bioreactors) along the basin perimeter slopes, combined with shallow free water surface (FWS) wetland areas. <br />This will serve to enhance overall nitrogen removal rates of the system, while creating wet meadow habitat <br />along the basin perimeter and along potential interior dike features. <br />The proposed treatment wetland will receive a portion of the effluent from the WPCP, not to exceed 0.95 mgd, <br />that has passed through an engineered nitrification system with an expected nitrification efficiency of 75-90%. <br />Expected influent NO3-N concentrations range between 30-36 milligrams per liter (mg/L). <br />Polished wastewater will discharge directly to San Francisco Bay at the existing outfall located at the western <br />edge of the existing basin, consistent with the existing NPDES permit for the Proposed Facility. <br />Figure 2-9 illustrates conceptual -scale features of the Proposed Project, and Figures 2-10 through 2-11 <br />represent conceptual views of the basin and the proposed features. <br />San Leandro Treatment Wetland <br />IS/MND <br />February 2024 <br />
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