Waste Water Treatment Plant (WWTP) Secondary and Tertiary

6 Documents in Project

Summary

SCH Number
2013052032
Lead Agency
Davis, City of (City of Davis)
Document Title
Waste Water Treatment Plant (WWTP) Secondary and Tertiary
Document Type
NOD - Notice of Determination
Received
Posted
1/28/2015
Present Land Use
Wastewater Treatment/ Agriculture, Agriculture Preserve / Agriculture, Open Space

Document Description
The Project site consists of approximately 26.5 acres, with 1.4 miles of discharge pipeline, and the construction staging areas (on site at the WWTP and the 20 foot staging area along the pipeline alignment). The existing wastewater treatment system at the WWTP consists of an influent pump station, mechanical bar screen, an aerated grit tank, three primary sedimentation basins, two aeration ponds (typically used in water), three facultative oxidation ponds, a lemna pond, an overland flow system, a chlorine disinfection system, and restoration wetlands. Solids collected from the primary sedimentation basins are treated in an anaerobic digester and then are dewatered in three on-site sludge lagoons. Treated solids are land applied on the City's overland flow slopes and the upland areas of the restoration wetlands. Treated effluent is discharged to the Willow Slough Bypass and/or through the Davis restoration wetlands to the Conaway Ranch Toe Drain, both of which are considered Waters of the United States under the Clean Water Act and tributary to the Yolo Bypass. The Project consists of new secondary treatment, tertiary treatment, and solids handling facilities. Specifically, the improvements include an activated sludge process including biological reactor vessels and secondary clarifiers for solids separation; new filtration facilities; additional disinfection facilities; and mechanical solids thickening, dewatering, and storage facilities. Use of the existing ponds will change from treatment to storage, and the overland flow system will be decommissioned as part of the WWTP treatment process. In addition, the Project also includes the construction of flood protection around certain WWTP facilities to reduce impacts associated with potential flooding. The restoration wetlands will remain in place.

Contact Information
Carina Gaytan
State Water Resources Control Board
1001 I Street 16th Floor
Sacramento, CA 95814

Phone : (916) 241-5642

Location

Coordinates
38°35'29.5"N 121°40'.1"W
Cities
Davis
Counties
Yolo
Cross Streets
County Road 28H and County Road 105
Zip
95618
Total Acres
164.42
Waterways
Willow Slough Bypass
Township
9N
Range
3E
Section
29,33
Base
MDB&M

Notice of Determination

Approving Agency
State Water Board
Approving Agency Role
Responsible Agency
Approved On
Final EIR Available Location
State Water Board, Division of Financial Assistance, 1001 I Street, 16th Floor, Sacramento, CA 95814

Determinations

(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A Statement of Overriding Considerations was adopted for this project
No
(5) Findings were made pursuant to the provisions of CEQA
Yes
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