ATTACHMENT_05_-_140P8626Q0029_-_DRAWINGS-PHOTOS-MAPS.pdf

This is a solicitation support document providing technical specifications and site conditions for a deep cleaning contract at the Barry Baker Tunnel located on Bunker Road in the Marin Headlands, Sausalito, California, managed by Golden Gate National Recreation Area under the National Park Service.

The project requires comprehensive cleaning and maintenance of the tunnel including weep hole cleaning and mineral buildup removal on tunnel walls, roadway, curbing, and gutters. Key technical specifications indicate the tunnel has typical dimensions of 20 feet width, 13'-6" minimum clearance, and contains lighting conduits, water and sewer lines, and sanitary systems. The work involves inspecting and removing mineral buildup from weep holes and wire mesh, with potential replacement of wire mesh for up to 20 percent of weep holes. Estimated work includes approximately 218 total weep holes across the tunnel. The document specifies traffic control requirements including one-way inbound traffic only during operations, with work hours from 10pm to 6am. The spray vehicle must enter via the East Tunnel Entrance with timed light control, and workers must operate at the tail-end of spray vehicles. East Bound Bunker Road will be closed with vehicles detoured to McCullough Road. The staging area is located near Danes Road and Alexander Avenue with access from U.S. Highway 101. Detailed diagrams show tunnel cross-sections, weep hole locations, traffic control layouts for both north and south tunnel wall work, and site access routes. The document includes typical condition photographs showing current tunnel entrance conditions and mineral buildup requiring removal.