This Project is located in Calaveras County and work will take place at the Arnold WWTF. This
project will add a new secondary clarifier with new effluent pump, new metering and flow
splitting structures, replacement Return Activated Sludge and Waste Activated Sludge
(RAS/WAS) pump station, two additional aerobic digesters with submersible self-aspirating
aerators, new electrical and control building with new motor control center and master control
panel, upgraded PG&E power service, new generator, and associated improvements to yard
piping, grading, paving, power and control conduit and wiring, instrumentation, and
PLC/SCADA controls. The work involves upgrading an existing wastewater treatment process
and complete replacement of the electrical and control system for that facility. Careful
sequencing and coordination of the work in accordance with contract requirements and best
practices will be required to maintain existing facility operations and avoid unplanned
interruptions.