Line A-1 Capacity Improvements Along Claremont Avenue Between Mystic Street and Tanglewood Road in the Cities of Berkeley and Oakland, Alameda County
Summary
SCH Number
2026020167
Public Agency
Alameda County Flood Control and Water Conservation District
Document Title
Line A-1 Capacity Improvements Along Claremont Avenue Between Mystic Street and Tanglewood Road in the Cities of Berkeley and Oakland, Alameda County
Document Type
NOE - Notice of Exemption
Received
Posted
2/5/2026
Document Description
The project is located within Zone 12, along Line A-1, and proposes the construction of a segment of underground flood control bypass culverts within the roadway of Claremont Ave, between Tanglewood Road and Mystic Street, in the cities of Berkeley and Oakland. The Zone 12 Drainage Master Plan determined that Line A-1, starting at the northern boundary of the cities of Berkeley, is undersized. Due to site constraints, an underground culvert bypass system is proposed to increase capacity to contain the 100-year storm event design flows. The proposed culvert system will connect to the existing culvert system located in the City of Berkeley, run downstream along Claremont Avenue, then reconnects to the existing system, in the City of Oakland. The project proposes to construct approximately 3,700 linear feet of 60-inch reinforced concrete pipe and 450 linear feet of 36-inch reinforced concrete pipe along Claremont Avenue, along with associated storm drain manhole structures for maintenance. The project will remove one private tree and acquire a Permanent Storm Drain Easement from the Claremont Country Club. The purpose of the project is to mitigate the capacity constrain in Line A-1 by expanding the existing system with an underground culvert bypass along Claremont Avenue.
Contact Information
Name
Moses Tsang
Agency Name
Alameda County Flood Control & Water Conservation District
Job Title
Deputy Director
Contact Types
Lead/Public Agency
Address
Phone
Email
Name
James Yoo
Agency Name
Alameda County Flood Control & Water Conservation District
Job Title
Associate Environmental Compliance Specialist
Contact Types
Lead/Public Agency
Phone
Email
Location
Cities
Berkeley, Oakland
Counties
Alameda
Regions
Citywide
Cross Streets
Along Claremont Avenue Between Tanglewood Road and Mystic Street, In the Cities of Berkeley and
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
(Sec 15301) Existing Facilities
Reasons for Exemption
The proposed project constitutes repair, maintenance, and minor alteration to existing public facilities involving negligible expansion of use & the project consists of storm drain pipeline installation to improve existing pipeline to Alameda County Flood Control & Water Conservation District (District) storm drain infrastructure. These improvements will be located within the developed road right of way along Claremount Ave. Installation of the new pipeline and manhole structures are less than one mile of improvements and considered minor modifications within the existing road, which has been previously disturbed and developed with roadway improvements. The improvements will allow the District to more efficiently and effectively handle stormwater during rain events, thereby minimizing the potential of flooding and improving public safety.
Exempt Status
Categorical Exemption
Type, Section or Code
Sec. 15303 (D)
Reasons for Exemption
The proposed project constitutes repair, maintenance, and minor alteration to existing public facilities involving negligible expansion of use & the project consists of storm drain pipeline installation to improve existing pipeline to Alameda County Flood Control & Water Conservation District (District) storm drain infrastructure. These improvements will be located within the developed road right of way along Claremount Ave. Installation of the new pipeline and manhole structures are less than one mile of improvements and considered minor modifications within the existing road, which has been previously disturbed and developed with roadway improvements. The improvements will allow the District to more efficiently and effectively handle stormwater during rain events, thereby minimizing the potential of flooding and improving public safety.
Exempt Status
Statutory Exemption
Type, Section or Code
Sec. 15282 (K)
Reasons for Exemption
The proposed project constitutes repair, maintenance, and minor alteration to existing public facilities involving negligible expansion of use & the project consists of storm drain pipeline installation to improve existing pipeline to Alameda County Flood Control & Water Conservation District (District) storm drain infrastructure. These improvements will be located within the developed road right of way along Claremount Ave. Installation of the new pipeline and manhole structures are less than one mile of improvements and considered minor modifications within the existing road, which has been previously disturbed and developed with roadway improvements. The improvements will allow the District to more efficiently and effectively handle stormwater during rain events, thereby minimizing the potential of flooding and improving public safety.
County Clerk
Alameda
Attachments
Notice of Exemption
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