Interstate 680 Express Lanes from State Route 84 to Alcosta Boulevard Project Initial Study with Proposed Mitigated Negative Declaration/Environmental Assessmen


SCH Number
Lead Agency
Caltrans, District 4 - Bay Area/Oakland (California Department of Transportation, District 4)
Document Title
Interstate 680 Express Lanes from State Route 84 to Alcosta Boulevard Project Initial Study with Proposed Mitigated Negative Declaration/Environmental Assessmen
Document Type
MND - Mitigated Negative Declaration
Project Applicant
Alameda County Transportation Commission
Present Land Use
State ROW along I-680

Document Description
The California Department of Transportation, in cooperation with the Alameda County Transportation Commission, proposes to construct High Occupancy Vehicle/express lanes (HOV/express lanes) on northbound and southbound I-680 from SR 84 (Vallecitos Road) in Alameda County to north of Alcosta Boulevard in Contra Costa County. The project would also install electronic tolling equipment and signs; widen pavement in the median and shoulders; construct concrete barriers, retaining walls, and sound walls; and upgrade safety features throughout the project corridor. The project would close the 9-mile gap between the existing and in-progress express lanes to the north and south.

Contact Information
Brian Gassner
California Department of Transportation, District 4
111 Grand Avenue, MS 8B
Oakland, CA 94623

Phone : (510) 286-6025


Dublin Pleasanton San Ramon
Alameda Contra Costa
San Francisco Bay Area
Cross Streets
I-680/SR 84 interchange in south to I-680/Alcosta Boulevard interchange in north
State Highways
I-680, SR 84
Other Location Info
Along I-680 from post mile (PM) R10.6 to R21.9 in Alameda County and from PM R0.0 to R1.1 in Contra Costa County

Notice of Completion

Review Period Start
Review Period End
Development Type
Transportation:Highway/Freeway (High Occupancy Vehicle/express lanes)
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Forest Land/Fire Hazard Geologic/Seismic Greenhouse Gas Emissions Noise Public Services Recreation/Parks Soil Erosion/Compaction/Grading Toxic/Hazardous Traffic/Circulation Tribal Cultural Resources Vegetation Water Quality Water Supply Wetland/Riparian Wildlife Growth Inducing Land Use Cumulative Effects
Reviewing Agencies
California Air Resources Board California Department of Conservation California Department of Fish and Wildlife, Bay Delta Region 3 California Department of Forestry and Fire Protection California Department of Parks and Recreation California Department of Resources Recycling and Recovery California Department of Transportation, District 4 California Department of Water Resources California Governor's Office of Emergency Services California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Public Utilities Commission California Regional Water Quality Control Board, San Francisco Bay Region 2 Department of Toxic Substances Control Office of Historic Preservation State Water Resources Control Board, Division of Water Rights


Environmental Document
2020050579_NOA   PDF 500 K ALA-680 (0Q3000)_IS-EA_Public Draft   PDF 46678 K ALA-680 (0Q3000)_NOA_Ad_20200521   PDF 2606 K ALA-680 (0Q3000)_Summary_Form_20200527   PDF 609 K
ALA-680 (0Q3000)_NOC_20200529   PDF 344 K

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, 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. For more information, please visit OPR’s Accessibility Site.

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