San Lorenzo Creek Concrete Channel Wall Stabilization Behind 20941 Birch Street in Hayward, Alameda County
Summary
SCH Number
2024010534
Public Agency
Alameda County Flood Control and Water Conservation District
Document Title
San Lorenzo Creek Concrete Channel Wall Stabilization Behind 20941 Birch Street in Hayward, Alameda County
Document Type
NOE - Notice of Exemption
Received
Posted
1/19/2024
Document Description
The Alameda County Flood Control and Water Conservation District (District) proposes to rehabilitate a minor horizontal joint displacement along an approximately 34-foot-long portion of the existing vertical concrete flood control channel wall of San Lorenzo Creek (District Zone 2 Line B), located behind 20941 Birch Street in Hayward. The project involves the installation of six 24-inch diameter, 25.5-foot deep reinforced concrete piles placed at 6 feet on center, behind the existing 13-foot high vertical channel wall; excavation and disposal of approximately 37 cubic yards of soil behind the concrete wall within the existing access road, for an approximately 170-square-foot area to install the new piles; backfill excavated area behind the concrete wall with lightweight fill consisting of controlled low-strength material (CLSM); installation of five horizontal underground wall anchors; installation of underground concrete grade beam; and restoration of the maintenance access road to its original elevation. All work will be performed from the top of the maintenance access road, outside of the concrete channel. The purpose of the project is to stabilize the existing vertical concrete channel wall from further deflection to extend the service life of the District’s flood control facilities.
Contact Information
Name
Jacquelyn Tom
Agency Name
Alameda County Flood Control & Water Conservation District
Job Title
Assistant Environmental Compliance Specialist
Contact Types
Lead/Public Agency
Phone
Email
Location
Cities
Hayward
Counties
Alameda
Regions
Countywide
Other Location Info
Behind 20941 Birch Street in Hayward
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1; California Code of Regulations, title 14, section 15301
Reasons for Exemption
The proposed project involves repair, maintenance, or minor alterations to existing structures and facilities involving negligible expansion of use.
County Clerk
Alameda
Attachments
Notice of Exemption
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