State Route 12 Capital Preventive Maintenance Project


SCH Number
Lead Agency
Caltrans, District 4 - Bay Area/Oakland (California Department of Transportation, District 4)
Document Title
State Route 12 Capital Preventive Maintenance Project
Document Type
MND - Mitigated Negative Declaration
Project Applicant
Caltrans District 4
Present Land Use
Transportation Corridor/Low- and Medium-Density Residential, Commercial, and Mixed-Use Development

Document Description
The California Department of Transportation (Caltrans) has prepared this Initial Study (IS) with Proposed Mitigated Negative Declaration (MND) for the State Route (SR) 12 Capital Preventive Maintenance (CAPM) Project in Sonoma County, California (the Project). The Project proposes resurface the existing pavement on SR 12, including the shoulders, between Llano Road (Post Mile [PM] 11.0) and Farmers Lane (PM 17.4) from the outskirts of the City of Sebastopol to the City of Santa Rosa in Sonoma County. Additional work includes upgrading 4 curb ramps to meet American with Disabilities Act (ADA) standards, replacing up to 38 existing concrete approach slabs with 1.25 foot-thick new slabs, reconstructing drainage infrastructure, and upgrading up to 10,000 linear feet of the existing metal beam guardrail (MBGR) to Midwest Guardrail System (MGS), The shoulder of the connector between southbound U.S. Highway 101 (U.S. 101) and westbound SR 12 would be widened to approximately 10 feet and require the removal of approximately 7 to 10 landscaped trees. Along the eastbound SR 12 to southbound U.S. 101 connector, a 300-linear-foot drainage system would be reconstructed on the outside shoulder from the end of the existing retaining wall to the existing sound wall. All work proposed would be within the Caltrans right of way (ROW).

Contact Information
Arnica Maccarthy
Caltrans, District 4
111 Grand Avenue
Oakland, CA 94612

Phone : (510) 286-7195


Santa Rosa
State Highways
SR 12, SR 116, and U.S. 101
Sonoma-Marin Area Rail Transit
Laguna de Santa Rosa, Santa Rosa Creek, Spring Creek, and Matanzas Creek
Other Location Info
Cross Streets: Llano Rd, Irwin Ln, Merced Ave, Fulton Rd, Stony Point Rd, N Dutton Ave, U.S. 101, Santa Rosa Ave, Brookwood Ave, and Farmers Ln Schools: Montgomery High School Wright Charter School,Luther Burbank Elementary School

Notice of Completion

Review Period Start
Review Period End
Development Type
Transportation (Pavement Resurfacing/Rehabilitation - Roadway Preservation)
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 Job Generation Minerals Noise Population/Housing Balance Public Services Recreation/Parks Soil Erosion/Compaction/Grading Solid Waste Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Wetland/Riparian Land Use Cumulative Effects Energy
Reviewing Agencies
California Air Resources Board California Department of Fish and Wildlife, Bay Delta Region 3 California Department of Parks and Recreation California Department of Water Resources California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Public Utilities Commission California Regional Water Quality Control Board, North Coast Region 1 Department of General Services Department of Toxic Substances Control State Water Resources Control Board, Division of Drinking Water


Environmental Document
0K520_FDED_508_20191223   PDF 11322 K 0K520_Sample_Summary_for_Electronic_Document_Submittal_20191202   PDF 206 K
NOC   PDF 1701 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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