Alhambra Valley Road Safety Improvements (at Rancho La Boca Road and Ferndale Road)

3 Documents in Project


SCH Number
Lead Agency
Contra Costa County
Document Title
Alhambra Valley Road Safety Improvements (at Rancho La Boca Road and Ferndale Road)
Document Type
NOD - Notice of Determination
Present Land Use
Roads: Public/Semi-Public; Surrounding Parcels: General Agriculture (A-2), Agriculture Preserve (A-4)
Document Description
Alhambra Valley Road is a rural road with winding turns and poor sight distance in some locations. The project consists of widening two segments; at Rancho La Boca Road (Site 1) and just west of Ferndale Road (Site 2). The purpose of the project is to minimize the potential for injuries from vehicles running off the road. The improvements will also allow for bicyclists to ride outside of the main travel way. The project will improve these segments by providing paved shoulders and removing or relocating roadway obstacles, including utility poles, guardrails, trees, and landscaping, to provide a clear recovery zone for vehicles; roadway flashers will be installed in both directions at both sites. Cut and fill earthwork will be required to accommodate these proposed improvements and to improve sight distance at Site 1. Drainage improvements include installation of storm drain inlets and associated pipe connections, and installation of concrete headwalls and rock slope protection at an existing culvert at Site 2. Disturbed areas will be stabilized as necessary following construction. Construction activities will be generally limited to the hours between 7:00 a.m. to 5:00 p.m.; noise-generating activities will be limited to 8:00 a.m. to 5:00 p.m. Construction of the project will require either one-way traffic control for 4 weeks or a 2-week full road closure from just west of Ferndale Road to west of Rancho La Boca Road. Mail notifications will be sent to surrounding property owners prior to start of construction implementation of road closure, if needed. In addition, detour route signs will be posted seven days prior to start of construction at various locations in the project vicinity; emergency vehicles will have access at all times. Proposed right-of-way acquisitions will consist of silver portions (varying between 5 and 30 feet) along the frontages of several residential properties to accommodate the widening. Permanent drainage and utility easements, and temporary construction easements will also be needed. Construction of the project is anticipated to start sometime between April and October in 2016 and take approximately three months to complete.

Contact Information

Claudia Gemberling
Agency Name
Contra Costa County
Contact Types
Lead/Public Agency


Contra Costa
Cross Streets
Rancho La Boca Road and Ferndale Road
Total Acres
Unnamed tributary to Alhambra Del Hambre

Notice of Determination

Approving Agency
Contra Costa County
Approving Agency Role
Lead Agency
Approved On


(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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