February 11, 2025
Jeff Hitch
City Engineer
Department of Public Works/Engineering
City of Murrieta
Re: Proposal for Emergency Bridge Investigation and Recommendations for Repair Hayes Avenue
Dear Mr. Hitch:
Michael Baker International (Michael Baker) is pleased to provide a proposal to conduct a field investigation and provide recommendations for an emergency repair of the referenced Hayes Avenue Project understanding, phasing and scope of work is outlined in Exhibit A. Compensation and Payment are outlined in Exhibit B. Fee Schedule is included in Exhibit C.
If you have any questions, please do not hesitate to contact me at (949) 933-2552 or [email protected].
Sincerely,
Todd L. Pitner, P.E., QSD, QSP
Project Manager
Michael Baker International
[email protected].
EXHIBIT A
Project Understanding, Phasing and Scope of Work
Project Understanding
Michael Baker International (Baker) has been requested by the City of Temecula (City) to provide emergency bridge investigation for timber bridge located along Hayes Avenue in the City of Temecula, CA.
In its current condition the bridge provides typical highway (HL 93) access over an earthen trapezoidal stormwater channel and is intended to continue to carry typical highway loads (HL 93) in the future (including fire trucks).
The bridge is constructed with a single 15-ft span. There are no as-built records for the existing bridge.
The bridge is a timber girder superstructure with wood decking, approximately 24-ft wide. The bridge is supported on a seat type concrete abutment.
The critical goal of load rating is to ensure collapse-prevention. A failure of the superstructure would be catastrophic and would be the minimum effort for the focus of the Load Rating.
The foundation support is equally important but vastly more difficult to determine. A failure of the foundation would likely lead to some settlement, followed by bridge closure and repair or replacement.
Because invasive and costly measures would be required to investigate the size and type of the existing foundations, load rating of the foundations is not currently included in the scope of work.
Scope of Work:
Task 1: Field Investigation (Tuesday, February 11, 2025) a. General Visual Inspection
i. Visually Assess overall bridge condition and any visible deterioration ii. Visually Check for signs of settlement, misalignment, or structural movement iii. Document vegetation growth, debris accumulation, or scour around substructure b. Superstructure:
i. Identify cracks, checks, splits, and delamination in deck planks ii. Check for rot and insect damage
iii. Examine fasteners, bolts, and nails for corrosion or loosening iv. Assess bearing conditions at girders supports for signs of crushing or shear failure c. Substructure (pending visual access)
i. Check for signs of scour or undermining around footings ii. Examine bearing areas for excessive deformation or crushing iii. Look for settlement or lateral movement in supports d. Railings
i. Visually observe guardrails and barriers for cracks or fastener failure ii. Check rail post connections for stability and deterioration e. Documentation and Reporting
i. Take photographs and video documentation of all findings ii. Record detailed measurements and sketch damage locations Task 2: Structural Observation Report - Findings / Recommendations Report will be prepared based on the finding of the field investigation with a completion date of February 21, 2025. Report to include the following:
Summary of findings/description of existing condition Photographic summary from field investigation
Schematic drawing of existing bridge with dimensions (plan view and sections) Determine feasibility of a “short-term” fix
a. Baker bridge engineers will perform a load-rating analysis of the existing bridge according to the AASHTO Manual for Bridge Evaluation, to support the highway loading. The team will also review and determine if there is a need for legal load limits and coordination of any load postings (if required).
If feasible, recommendations and details of repairs to be provided (i.e., Replacement of deck cross member(s) with same or similar material and repaving the surface to match existing)
Note: If a “short-term” fix is not feasible, findings will be documented in report. City will declare an emergency, initiate environmental permits under emergency and proceed with the design and construction of a reinforced concrete box to replace the existing bridge.
Task 3: Project Management, Coordination and Meetings
Michael Baker will attend project meetings and perform coordination and contract administration associated with this project. This task shall be performed on a time and materials basis. An initial budget of twenty (20) hours has been assigned for this Task.
EXHIBIT B
Compensation / Payment
Michael Baker shall complete the work outlined above in accordance with the fee schedule identified below and shall invoice Client on a monthly basis based on the hours worked. Client agrees to compensate Michael Baker or such services as follows:
ITEM DESCRIPTION Time & Materials (Not to Exceed)
Task 1: Field Investigation ................................................................................... $2,978.00 Task 2: Structural Observation Report – Findings / Recommendations .............. $8,440.41 Task 3: Project Management, Coordination and Meetings ................................. $4,487.52
Total Fee $15,905.92
All tasks shall be billed hourly. The budget amount shown is for authorization purposes only. Should the total of the monthly billings reach eighty percent (80%) of the budget amount, Client and Michael Baker will review the status of the work to determine the need for an increase in the budget amount, and whether additional budget authorization to complete the project is appropriate.
EXHIBIT C
Fee Schedule