Plumas County, California

ERRG conducted an improvement project at the Lake Davis Water Treatment Plant in Plumas County, California from February 2008 to December 2009 for the U.S. Army Corps of Engineers. ERRG constructed a new 1.5 million gallon per day microfiltration water treatment system within a new pre-engineered steel building to treat raw water from Lake Davis and provide the City of Portola with a dependable potable water supply.

ERRG personnel demolished and removed existing buildings and piping as needed and constructed two buildings during this project. ERRG also installed piping, tanks, and pumps; cleaned and recoated the interior of existing tanks; and installed electrical wiring.

The project also required earth moving; excavation and construction of concreted-lined basins; construction of a modular concrete retaining wall, and grading and re-graveling of an existing access road.

Additional work performed by ERRG after construction of the treatment system included installation of a sprinkler irrigation system, hydro-seeding, and system startup and operator training.