Redwood Road MM 8.15 Storm Damage Repair (Lake Chabot) in Castro Valley, Alameda County
Summary
SCH Number
2024050530
Public Agency
Alameda County Public Works Agency
(ACPWA)
Document Title
Redwood Road MM 8.15 Storm Damage Repair (Lake Chabot) in Castro Valley, Alameda County
Document Type
NOE - Notice of Exemption
Received
Posted
5/13/2024
Document Description
The Alameda County Public Works Agency owns and maintains Redwood Road which connects Oakland and Castro Valley. Due to the 2022-2023 severe winter storms, a 30-inch diameter CMP culvert crossing under Redwood Road at Mile Marker (MM) 8.15 was clogged by debris and stormwater runoff from upstream of the culvert inlet overtopped the roadway. The overtopping caused significant roadway embankment scouring and roadway structural damages making the roadway impassible. Both lanes of Redwood Road have been completely closed since the storm damage occurred. As a result, permanent roadway repairs are being proposed to fix the road in order to re-open the roadway for vehicle traffic and to prevent the roadway from continuing to erode and collapsing into the nearby creek during this upcoming rain season. The repairs will include removing and disposing of approximately 2,500 CY of debris, including earth flow into the drainage area downstream of the roadway on EBRPD property and structural excavation to stabilize the slope. Additionally, the disturbed area will be smooth and further stabilized by hydroseeding with a native seed mix and installed BMPs to reduce the potential for erosion and further sediment loss. The road embankment repair will consist of installing 24-inch diameter cast-in-drill hole piles foundation with a pile cap to support a geogrid reinforced masonry block wall, backfilling masonry block wall and embankment with approximately 4,500 CY of mechanically stabilized earth, replacing the damaged 30-inch damaged CMP with a 36-inch CMP pipe, and installing rock rip rap energy dissipator at the pipe outfall. This will be followed by the reconstruction of the roadway structural section with aggregate base, asphalt concrete resurfacing, installation of a guardrail and striping of the roadway and installing a new 18-inch CMP from the adjacent and upgradient drainage way to facilitate better drainage of the area.
Contact Information
Name
James Yoo
Agency Name
Alameda County Public Works Agency
Job Title
Associate Environmental Compliance Specialist
Contact Types
Lead/Public Agency
Phone
Email
Location
Cities
Castro Valley
Counties
Alameda
Regions
Unincorporated
Cross Streets
Redwood Road Mile Marker 8.15
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
(Sec 15301) Existing Facilities, (Sec 15304 (i) Minor Alterations, Emergency Projects (Sec 15269, 15359)
Reasons for Exemption
The project is categorically exempt as described in State CEQA Guidelines (Sec. 15301) Class 1: Existing Facilities, consists of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of use beyond that existing at the time of the lead agency’s determination.
County Clerk
Alameda
Attachments
Notice of Exemption
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