Gridley Wastewater Treatment Plant Expansion Project

Gridley Wastewater Treatment Plant Expansion Project

The proposed project will address future capacity needs at the existing wastewater treatment plant over the next 20 years. The proposed project will result in an increase in the design capacity from a maximum dry weather flow of 1.05 million gallons per day (mgd) to 1.7 mgd. The increase in primary and secondary treatment capacity will be achieved by significantly increasing aeration in the aeration and polishing ponds (ponds #1 and #2 respectively), improving mixing in the aeration pond and replacing the existing headworks with a new facility. Hydraulic upgrades consisting of yard piping and inlet/outlet modifications will be performed to maintain the required minimum 2 feet of freeboard in all ponds at peak flows. The proposed modifications to the existing aeration systems will increase the wastewater treatment plant capacity and will reduce total suspended solids (TSS) and biochemical oxygen demand (BOD) concentrations in the effluent produced.

Gridley

Butte

California Department of Conservation (DOC), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Health Care Services (DHCS), California Department of Parks and Recreation, California Department of Transportation, District 3 (DOT), California Highway Patrol, California Native American Heritage Commission (NAHC), California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), Central Valley Flood Protection Board, Department of Toxic Substances Control, Resources Agency, State Water Resources Control Board, Divison of Financial Assistance, Department of Water Resources

Department of Water Resources

Other (Infrastructure Installation)

Infrastructure

Air Quality, Cultural Resources, Vegetation, Wildlife, Other