September 25, 2012

GGBHTD Plans to Adopt a Mitigated Negative Declaration for a Proposed Project to Make Improvements to Alexander Avenue/Danes Drive Intersection

Public Comments Welcomed through October 21, 2012

The proposed project has undergone the federal environmental review as required under the National Environmental Policy Act (NEPA) and a Finding of No Significant Impact (FONSI) (downloadable PDF) was approved in May 2012.

The required California Environmental Quality Act (CEQA) filing is now being completed as the Golden Gate Bridge, Highway and Transportation District (GGBHTD) plans to adopt a Mitigated Negative Declaration for the proposed project to make improvements to the Alexander Avenue/Danes Drive intersection within Golden Gate National Recreation Area (GGNRA) north of the Golden Gate Bridge in Marin County.

Public comments on the Draft Initial Study/Mitigated Negative Declaration (downloadable PDF 6.43 MB) are being accepted through October 21, 2012 at 4:30 pm. Submit comments via email to or via US Mail to Office of the District Secretary, GGBHTD, P.O. Box 9000, Presidio Station, San Francisco, CA 94129-0601. A copy of the Draft Initial Study/Mitigated Negative Declaration is also available for review in the office of the District Secretary, Golden Gate Bridge Admin Building, San Francisco, CA 94129, weekdays 8:30 am to 4:30 pm.

PROJECT LOCATION: Improvements are planned for a 1,500-ft section of Alexander Avenue north of the US 101 interchange and approximately 200 feet of Danes Drive between Alexander Avenue and East Bunker Road.

PROPOSED IMPROVEMENTS: (1) Addition of roadside shoulders to both sides of Alexander Avenue within the project limits to accommodate bicyclists and pedestrians outside of the traffic lanes; (2) Reconfigure the Alexander Avenue/Danes Drive intersection from a “Y” to a “T” intersection to improve the limited sight distance and overall operation of the intersection; and (3) Lengthen existing left turn lane from northbound Alexander Avenue to westbound Danes Drive to allow for improved deceleration in the turn lane and to increase storage capacity.

To achieve these improvements, Alexander Avenue will require widening in the project area which will include the establishment of a new cut slope along the east side of Alexander Avenue between the US 101 interchange to the south and the intersection with Danes Drive to the north; and implementation of a retaining structure to support the placement of fill above the Bunker Road Arch Tunnel to allow widening of Alexander Avenue north of the Danes Drive intersection.

Under the FONSI approved in May 2012, of the three alternatives considered for the establishment of the cut slope (a 5-foot rockfall catchment; an 8-foot rockfall catchment; and a 16-foot rockfall catchment), the 8-foot rockfall catchment was the selected alternative.

SURROUNDING LAND USES AND SETTING: The project is located within the Golden Gate National Recreation Area in the Marin Headlands. The surrounding land use is National Park.

POTENTIAL ENVIRONMENTAL IMPACTS: An Initial Study has been prepared for the proposed project. The Initial Study identified potentially significant impacts associated with the project related to air quality, cultural resources, hazardous materials, and noise. Each of these impacts would be mitigated to less-than-significant levels with implementation of the identified mitigation measures, which are included as part of the project.