© 2019 by LEE & RO, Inc.

Wastewater Treatment Plant Phases 1, 2, and 3

Expansion and Upgrading Projects

City of Patterson

Patterson, CA


LEE & RO has provided planning, engineering, design and construction management / resident engineering services for plant expansion and modification projects which is being implemented in three phase.  The $5 million Phase 1 increased the plant capacity from 0.5 to 1.3 mgd in 2003 and $11 million Phase 2 Project further increased the capacity in 2007 from 1.3 to 2.0 mgd with nitrification & denitrification capability. The $14 million Phase 3 project is scheduled to be complete in October 2015, will increase the plant capacity to 2.75 mgd and improve process reliability.  These projects replaced the pond treatment systems. The upgraded plant processes consists of influent pump station, headworks, oxidation ditch activated sludge, centrifuge dewatering, and percolation ponds.