Gridley Wastewater Treatment Plant Expansion Project

4 Documents in Project


SCH Number
Lead Agency
Gridley, City of (City of Gridley)
Document Title
Gridley Wastewater Treatment Plant Expansion Project
Document Type
NEG - Negative Declaration
Present Land Use
Industrial Z: General Industrial

Document Description
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.

Contact Information
Andrea Redamonti
City of Gridley
685 Kentucky Street
Gridley, CA 95948

Phone : (530) 846-3631


Cross Streets
E. Gridley Road
Parcel #
State Highways
Hwy. 99
Feather River
3, 4

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Infrastructure Installation)
Local Action
Other Action Other Action: Infrastructure
Project Issues
Air Quality Archaeologic-Historic Vegetation Wildlife Other
Reviewing Agencies
California Department of Conservation California Department of Fish and Wildlife, Region 2 California Department of Health Care Services California Department of Parks and Recreation California Department of Transportation, District 3 California Highway Patrol California Native American Heritage Commission California Public Utilities Commission Central Valley Flood Protection Board Department of Toxic Substances Control Regional Water Quality Control Bd., Region 5 (Sacramento) Resources Agency State Water Resources Control Board, Divison of Financial Assistance Department of Water Resources

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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