Riverside Ponds and Headworks Mitigation Project, Ph. II

Flood Protection Put in Place for The Napa River

The Regional Water Quality Control Board required that the City modify its wastewater treatment plant (WWTP) ponds to remove them from the 100-year flood plain and provide a liner to protect the ponds from the adjacent Napa River.  Over the years the erosion of the Napa River and its tributaries (Simmons Creek and Oat Hill Mine Ditch Creek) have threatened the City’s vital WWTP infrastructure.

The FEMA-funded project will stabilize the adjacent riverbanks and protect the City’s WWTP and the waterways from potential contamination during a flood event.  The Bennett+Y&C team is providing plans, specifications, and estimates to regrade and stabilize the City’s WWTP ponds, yard piping to support the new ponds, a new force main, and environmental permitting.