City of Willits Surface Water Treatment Plant Upgrade Project

Summary

SCH Number
2011068180
Lead Agency
Willits, City of (City of Willits)
Document Title
City of Willits Surface Water Treatment Plant Upgrade Project
Document Type
NOE - Notice of Exemption
Received

Document Description
Proposed upgrades to existing Water Treatment Plant to correct deficiencies and provide redundancy and improved reliability, and meet Environmental Protection Agency and California Department of Public Health regulatory requirements, potentially including any or all of the following: Installation of a Solids Contact Upflow Clarifier; Installation of a lime storage and slurry feed system for alkalinity, Ca2+ and alkalinity improvements; Installation of a carbon dioxide storage and carbonic acid feed system for pH adjustment; Installation of coagulant (PAC) chemical injection and mixing facility upstream of the new SCUC, Installation of a third Siemens Trident Microfloc unit with electrically actuated flow control valves, Upsizing of filter-to-waste piping; Reconfiguration of the Backwash Clarification Lagoons to provide better settling condition. Replacement of the two existing Microfloc units prieumatically actuated flow control valves with electrically actuated valves; Installation of at state-of-the art PLC and SCADA system; Replacement of the water treatment building transformer and breakers; and Provision of reliable backup power to the raw water intake pump station.

Contact Information
Tom Mannatt
City of Willits
111 E. Commercial Street
Willits, CA 95490

707 459 7136

Location

Cities
Willits
Counties
Mendocino

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
C:2;S:15302(c)
Reasons for Exemption
This project involves maintenance, replacement and upgrades to existing water treatment plant infrastructure involving negligible or no increase in system capacity.
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