Cattail Creek WWTP 1000pxDesign of a new wastewater treatment plant (WWTP) to replace an existing plant that had failed to meet effluent discharge limits of the groundwater discharge permit for several years. A continuous influent sequencing batch reactor (CSBR) was selected to meet the 30/30/10 discharge limits for a peak design flow of 34,800 gpd. The new plant was designed to be compatible with the existing influent sewage pumping station, effluent dosing station, and low pressure deep trench subsurface disposal system.