City of Healdsburg Wastewater Treatment Plant Upgrade Project

City of Healdsburg Wastewater Treatment Plant Upgrade Project

Wastewater Treatment Plant Upgrade: The City's existing secondary treatment process would be upgraded to a Membrane Bioreactor (MBR) process with Biological Nitrogen Removal (BNR), which would provide advanced (tertiary) treatment in accordance with RWQCB and DHS guidelines and standards. All facilities would be on an existing 36-acre wastewater treatment plant site owned by the City of Healdsburg. Effluent Disposal: The City's preferred alternative for effluent disposal is a contiuation of the current discharges to the Basalt Pond, located adjacent to the treatment plant site. The Basalt Pond has a capacity of approximately 500-700 million gallons and covers from 60 to 70 acres, depending on water level in the pond. The discharge to the Basalt Pond would differ from existing conditions in that it would involve discharging tertiary treated water rather than secondary treated water, and the discharge to the Basalt Pond would eventually occur on a seasonal basis, subject ot the terms and conditions of the RWQCB. At other times of the year, the other effluent storage, disposal, and seasonal irrigation reuse components would be used to store or dispose of the effluent. No new outfall structure to the Basalt Pond would be constructed. Seasonal Irrigation Reuse Components: In addition to the WWTP upgrade and effluent disposal components, the project includes beneficial reuse of treated effluent, through both agricultural and urban seasonal irrigation. The components would be used for disposal and seasonal irrigation reuse of all or part of the expected 400-550 million gallons of annual wastewater flows from the treatment plant. The effluent disposal/seasonal irrigation components would include three effluent disposal options described and evaluated in the EIR: - Foreman Lane to Tayman Park recycled water line - agricultural irrigation/urban reuse, - Foreman Lane/Mill Creek Road recycled water line - agricultural irrigation reuse, and - Syar property agricultural irrigation reuse. This component would include the construction and operation of the recycled water pipelines, pump stations, storage tanks, and other distribution facilities as necessary to make recycled water available to private property owners. Facilities generally would be located in the existing public rights-of-way. Long-term property easements would be developed for selected structures where necessary. The project would be limited to the construction of a distribution network and would not involve the construction or operation of irrigation facilities on private properties.

Healdsburg

Sonoma