HomeMy WebLinkAboutAgenda Bill 5.A 02/28/2011DATE: February 28, 2011
TO: Honorable Mayor and Members of the City Council through City Manager
FROM: Larry Zimmer, Public Works Capital Improvements Division Manager
SUBJECT: Resolution Approving the Washington Street Bridge Seismic Rehabilitation
Project and Accepting the Proposed FY 2010/2011 Project Budget
RECOMMENDATION
It is recommended that the City Council adopt the attached resolution approving the Washington
Street Bridge Seismic Rehabilitation Project and accepting the proposed FY 2010/2011 project
budget.
BACKGROUND
In 2008, a repair project was completed on the Washington Street Bridge, over the Petaluma
River, which had been recommended by Caltrans, based on their bridge inspection reports. The
project was funded using Traffic Mitigation Fees, and was managed by the Public Works Capital
Improvement staff. At that time, the project removed and replaced deteriorating concrete on the
pile- columns to protect the inside steel piles from corrosion. As part of the same project, the
bridge approaches were repaired, and a sealant applied to the concrete deck. During design of
this retrofit, the project consultant questioned the ability of the bridge to withstand a major
seismic event. A cursory review of the as -built drawings pointed to a possible design deficiency
of the bridge, which was built prior to current seismic design standards. It should be noted that
the work done in 2008 was necessary repair and maintenance, and was not part of this potential
seismic retrofit.
Caltrans /federal funding for seismic retrofit is not available unless bridge vulnerability can be
demonstrated, and per Caltrans, the as -built drawings alone are not adequate to prove bridge
vulnerability. For this reason, the City hired a structural engineering consultant to perform a
seismic vulnerability analysis. The analysis, based on Caltrans 2009 seismic design criteria,
suggests that the bridge is potentially vulnerable to unacceptable failure during what they
identify as a "credible" earthquake.
Staff submitted the seismic vulnerability analysis report to Caltrans for consideration and applied
for a federal Highway Bridge Program (HBP) grant last July. Caltrans recently approved a FY
Agenda Review:
City Attorney Finance Director City Manager
10/11 grant in the amount of $221,325 for design (preliminary engineering, or PE, in
Caltrans /federal terms) of the seismic retrofit, which will likely take a year to complete.
Before the City can apply for HBP grant funding for construction, Caltrans must approve the
final design and a construction cost estimate. Therefore, Caltrans has placed the potential
funding for construction in the 2014 fiscal year and beyond. Although the design work could be
delayed, depending on the length of that delay, staff would likely need to reapply for the funds.
DISCUSSION
In order to proceed with the PE Phase, the City needs to identify the project and budget in the
2010/2011 CIP. Once Caltrans approves the final design, staff will apply for construction
funding, return to Council for approval of the estimated construction budget, and advertise the
project. It is expected that additional HBP Grant funding will be available for the construction
phase of the work. However, since these funds are limited, it is not guaranteed.
FINANCIAL. IMPACTS
The federal HBP grant will fund 88.53% of design, construction, and construction management.
Use of $98,675 of Gas Tax is the source recommended to meet the project match required in the
design phase. Use of these funds, which have been specifically set aside for grant matches or
minor pavement work, will not impact any currently planned projects. Following is an estimate
of the total project cost, which will be further defined during the project development process.
ATTACHMENTS
1. Resolution
2
Estimated
Requested
Estimated
Federal HBP
CIP Budget
CIP Budget
Grant
Description
FY 10 /11
FY 13/14
Reimbursement
Design
$250,000
$221,325
Construction Contract
$2,500,000
$2,213,250
Construction Management
$300,000
$265,590
CIP Overhead, Admin. and Grant Match
$70,000
$600,000
$0
Contingency
$375,000
$331,988
TOTAL
$320,000
$3,775,000
$3,032,153
Funding Sources
2411-16500-54150 (Gas Tax)
$98,675
Federal HBP Grant
$221,325
$2,810,828
$3,032,153
Unidentified City Funds future
$964,172
TOTAL
$320,000
$3,775,000
ATTACHMENTS
1. Resolution
2
ATTACHMENT I
RESOLUTION APPROVING THE WASHINGTON STREET BRIDGE SEISMIC
REHABILTATION PROJECT AND ACCEPTING THE PROPOSED FY 2010/2011
PROJECT BUDGET
WHEREAS, the seismic vulnerability analysis of the Washington Street Bridge shows
that the bridge is eligible for Caltrans /federal funding for seismic retrofit; and
WHEREAS, staff successfully applied for Federal Highway Bridge Program (HBP)
funding and was awarded $221,325 for design of the Washington Street Bridge Seismic
Rehabilitation Project; and
WHEREAS, the proposed project will allow a seismic retrofit of the Washington Street
Bridge to withstand a major seismic event; and
WHEREAS, upon Caltrans' approval of the final design and construction cost estimate,
the City will be eligible to apply for an HBP grant for construction funding.
NOW, THEREFORE, BE IT RESOLVED that the City Council of the City of
Petaluma hereby:
1. Amends the FY 2010/2011 Adopted CIP Budget to include the Washington Street Bridge
Seismic Rehabilitation Project.
2. Accepts the proposed project budget for FY 2010/2011 in the amount of $320,000, which
includes a transfer of $98,675 from account number 2411 - 16500 - 54150.
3