Current Projects All Current Projects are located at USD's Alvarado Wastewater Treatment Plant in Union City. Home » About Us » USD Construction Projects » Current Projects All Current Projects are located at USD’s Alvarado Wastewater Treatment Plant in Union CityAeration Blower No. 11 ProjectAlvarado Influent Pump Station Improvements ProjectCalcium Thiosulfate Chemical Feed System ProjectCathodic Protection System Improvements ProjectCentrifuge Building Improvements ProjectEmergency Outfall Improvements ProjectFY21 Cast Iron/Pipe Lining ProjectFY21 Gravity Sewer Rehabilitation/Replacement Project – Phase VIIPrimary Digester No. 7 Project (with time-lapse video)Â