Patterson Valve Exercise (OM-DFD-2024-030)
Summary
SCH Number
2025090924
Public Agency
California Department of Water Resources
(DWR)
Document Title
Patterson Valve Exercise (OM-DFD-2024-030)
Document Type
NOE - Notice of Exemption
Received
Posted
9/19/2025
Document Description
DWR Division of Safety of Dams will perform a valve exercise at the Patterson Dam outlet works consisting of a butterfly valve (BFV), a steel conduit, a downstream BFV, and concrete conduit that conveys water to the outlet dissipation structure. The downstream BFV associated with the low-level outlet will be exercised by fully opening and closing. To avoid a sudden release of water to the drainage ditch, the steel conduit between both valves will require dewatering. The volume of water between the valves is approx. 881 gallons. The entire project is within the DWR right of way.
Contact Information
Name
Janine Beck
Agency Name
Department of Water Resources
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency / Parties Undertaking Project
Phone
Email
Name
Sara Lowry
Agency Name
Department of Water Resources
Job Title
Environmental Program Manager
Contact Types
Lead/Public Agency / Parties Undertaking Project
Phone
Email
Location
Coordinates
Cities
Livermore
Counties
Alameda
Regions
Northern California
Cross Streets
Patterson Pass Road and Greenville Road
Waterways
Patterson Dam
Other Location Info
South Bay Aqueduct, Mile Marker 9.36
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1, Existing Facilities, Section No. 15301
Reasons for Exemption
This project is exempt because it involves routine maintenance activities. This project will not result in impacts to special status species or habitat. The Categorical Exemption Class 1 will be used for CEQA compliance as this activity will be implemented without any environmental impacts.
County Clerk
Alameda
Attachments
Notice of Exemption
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