MH-FB TIMP - Alexander Avenue and Danes Drive Intersection Improvements Marin Headlands

View from Alexander Ave. towards the left turn onto Danes Dr.
View from Alexander Ave. towards the left turn onto Danes Dr. UPDATE 7/11/12: The Finding of No Significant Impact (FONSI) and Response to Public Comments are now available. The National Park Service (NPS) and Golden Gate Bridge Highway and Transportation District (GGBHTD) partnered to plan and conduct the environmental analysis for the proposed project. A joint Environmental Assessment/Initial Study (EA/IS) was prepared in accordance with NEPA and the California Environmental Quality Act (CEQA). This FONSI approves federal actions on NPS property only. GGBHTD issued a separate Notice of Determination for project actions on state land.
The purpose of the project was to correct existing deficiencies and substandard roadway conditions at the Alexander Avenue left-turn lane to Danes Drive. The project identified actions within the project area that addressed a number of deficient multi-modal transportation conditions which included: inadequate roadside shoulder width to handle shared bicycle, pedestrian, and automobile use; and skewed intersection geometry.

NPS and GGBHTD have selected Alternative D, the 8-Foot Rockfall Catchment Alternative, for implementation.

Alternative D allows for two 12-foot-wide vehicle lanes, a 12-foot-wide left turn lane, and a 5-foot-wide combined shoulder and bicycle lane on both sides of Alexander Avenue. Alternative D installed a temporary rockfall barrier between the catchment ditch and roadway. Any change to the temporary barrier (removal of the temporary barrier, possible installation of rockfall mesh, or installation of a permanent barrier) will be subject to a separate environmental evaluation (undertaken by NPS and the Federal Highway Administration Central Federal Lands Highway Division) prior to implementation. This alternative resulted in a final east cut slope height of approximately 77 feet and the total width of excavation will be approximately 91 feet. Figure 2-3 of the EA/IS provides a cross-sectional view looking north along Alexander Avenue of the proposed rock cut for Alternative D, including slope angles, finished slope height, and width of excavation.

Excavation of the rock cut occurred during the first phase of construction to provide additional space to ensure that one traffic lane in each direction could remain open during subsequent phases of construction. During this initial construction phase traffic was routed to the furthest west section of the roadway.

Contact Information:
goga_planning@nps.gov

Documents:
This Environmental Assessment (EA) evaluates the No Action Alternative and three action alternatives. For this analysis NPS is serving as the lead agency for National Environmental Policy Act (NEPA) compliance and GGBHTD is serving as the lead agency for California Environmental Quality Act (CEQA) compliance. An Initial Study (IS) was prepared under CEQA and is included in this document as Appendix A.Comments were accepted December 23 2011 to January 27, 2012.
A Finding of No Significant Impact (FONSI) has been prepared, in accordance with the National Environmental Protection Act (NEPA), for the Alexander Avenue/Danes Drive Intersection Improvement Project (proposed project). The FONSI describes the rationale used in selecting the alternative for implementation, and provides an explanation of why it will have no significant effects on the human environment.
The National Park Service (NPS) and Golden Gate Bridge Highway and Transportation District (GGBHTD) partnered to plan and conduct the environmental analysis for the proposed project. A joint Environmental Assessment/Initial Study (EA/IS) was prepared in accordance with NEPA and the California Environmental Quality Act (CEQA).
This is an electronic version of the paper mailer that was sent out to the public announcing the release of the document.
This document summarizes and responds to all of the comments that were received during the public review period of the EA/IS.



Last updated: February 28, 2015

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