2023 Spare Steam Turbine Rotor Project


SCH Number
Public Agency
Central Contra Costa Sanitary District
Document Title
2023 Spare Steam Turbine Rotor Project
Document Type
NOE - Notice of Exemption
Document Description
Central San operates two 2,950-hp steam-driven blowers to provide oxygen for the secondary treatment process. When one turbine is online, the other serves as its backup. In disassembling the steam turbine last year during a rebuild of the Aeration Unit #2 steam turbine, a considerable amount of damage was found in the nozzle block and throttle valve, so the Board declared an emergency situation. Also, because of the substantial wear, the existing rotor was removed and a spare rotor was installed. Central San plans to overhaul Aeration Unit #1 and expects to encounter a similar amount of damage. Other expected repairs will cause the project cost to exceed the General Manager authority limit, so Board approval of a contract amendment is being sought.

Contact Information

Agency Name
Central Contra Costa Sanitary District (Central San)
Job Title
Environmental Coordinator
Contact Types
Lead/Public Agency / Project Applicant / Parties Undertaking Project


unincorporated Martinez
Contra Costa
Northern California, San Francisco Bay Area, Unincorporated
Cross Streets
Imhoff Drive and Imhoff Place
State Highways

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
CEQA Guidelines Sections 15301
Reasons for Exemption
At its April 20 2023, meeting, the Central San Board of Directors independently found this project is exempt from the California Environmental Quality Act (CEQA) under Central San's CEQA Guidelines Section 15301, since it involves minor alterations to existing public facilities involving no expansion of use.
County Clerk
Contra Costa


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