11 - 021914 MAIN SUPERSTRUCTURE



JULY 29, 1999


PROJECT CONTACT PERSONS
PROJECT MANAGER:Ramon Ruelas(619) 688-6803
PUBLIC AFFAIRS OFFICE:Jim Larson(619) 688-6678
CONTRACTOR:AMERICAN BRIDGE CO.(562) 498-1060
LONG BEACH, CA 90804

CONTRACT INFORMATION
CONTRACTOR'S BID:$3,157,738.64
CONTRACT AWARDED:11/25/97
DATE COMPLETED:01/19/99



SEISMIC RETROFIT OF CORONADO TOLL BRIDGE
CONSTRUCTION NEWS REPORT

May 1998


PROJECT DESCRIPTION:

The seismic retrofit of the Coronado Toll bridge on this phase 1 project is limited to work on the superstructure from Pier 2 to Pier 33. The work includes installing hinge shear keys at eleven locations and modifying the longitudinal tie bars at eleven hinge locations. The box girders will be strengthened at Piers 18 and 21, forcing a realignment of the inspection walkway within the superstructure at those two locations. A minor modification to existing electrical utilities is also scheduled. The estimated cost of this phase 1 project is $3.2 Million.

PROGRESS UPDATE:

The General Contractor is the American Bridge Company and construction started on November 27, 1997. Construction activities currently underway include: erection of working platforms, fabrication of hinges ties, clean and paint structural steel, install hinge shear keys at tied hinges, modify tied hinges, water pollution control plan, relocate catwalk, and placement for temporary visual barrier for peregrine falcons nesting between piers 17 and 33. Some of the major accomplishments to date are:

Completed 100% of the Seismic Electric work.
Completed 100% of the placement of construction area signs.
Completed 30% of the structural steel fabrication for this project.

CRITICAL ACTIVITIES AND ANTICIPATED TARGET DATES:

Complete retrofit of hinge shear keys:Summer 1998
Complete retrofit of longitudinal tie bars:Summer 1998
Complete realignment of inspection walkway:Summer 1998
Complete painting of structural steel:Summer 1998
Project completion:Summer 1998

SCHEDULE:

Work scheduled over the next four months: install working platforms, remove existing hinge shear keys and replace with high strength hinge shear keys. The modification of longitudinal tie bars will involve removal of existing tie bars, paint and re-paint the structural steel prior to installing the longitudinal tie bars. The existing inspection walkway in box girders is under construction for realignment prior to strengthening of the box girders. A visual barrier has been installed between the nesting falcons and the construction work. The eelgrass in the bay has been delineated with buoys bordering the environmentally sensitive area. The Storm Water Pollution Prevention Plan (SWPP) will also be implemented. The majority of the construction work will be beneath the Toll Bridge deck.

TRAFFIC ADVISORY:

During the next few months, NB and SB Route 75 traffic will continue to use at least 1 lanes in each direction. Traffic control for this project will involve possible off-peak hour lane closures (nighttime between 8PM and 5AM). The navigation in the bay area will not be effected due to the anchoring of the barge at specific hinge locations. Bus service may be impacted for the after 10 PM schedules. Measures such as (COZEEP) Highway Patrol and Changeable message signs will be implemented to maintain safe and efficient movement of traffic through the construction zone. Warning signs will be placed at least 3 days in advance of ramp closures to advise motorists of the changing situations. Motorists are advised to use alternate routes while the work is in progress.