1450 Frazee Road, Suite 100, San Diego, CA 92108 Tele: 858 514-8377 Fax: 858 514-8608 www.dokkenengineering.com March 28, 2025
Ms. Jackie Lillio, PE, TE
Senior Engineer
Department of Public Works – Capital Improvement Projects City of Santa Clarita
23920 Valencia Boulevard
Santa Clarita, CA 91355
RE: Amendment No. 2 for Professional Services – Vista Canyon Bridge Re-Design of Spans 7-9 as part of Engineering Design Support During Construction
Ms. Lillio:
Dokken Engineering is pleased to submit this scope and fee amendment to re-design spans 7- 9 during construction of the Vista Canyon Road Bridge over the Santa Clara River in the City of Santa Clarita . This Amendment No. 2 request will append the First Amendment for Engineering Design Support During Construction task which was approved by the Santa Clarita City Council on 6/25/2024. A breakdown of proposed amended support tasks is provided below:
Task 1.1: Engineering Design Support During Construction The Santa Clara River is historically dry in the summer through the middle of fall. Due to extraordinary rainfall throughout the 2023 and 2024 wet seasons, an unprecedented condition of standing water in the Santa Clara River was present at the start of construction in August 2024. Dokken Engineering will expedite the re-design spans 7-9 of the Vista Canyon Road Bridge during construction to allow the CIDH foundations to be built outside of standing water . The re -design of the Vista Canyon Road Bridge during Construction includes the following for a Lump Sum Engineering Fee of $200,000:
Preliminary Layout Approval and Foundation Loads: Dokken Engineering will conduct on-site field visits to verify the location locations of standing water, site conditions, discuss potential crane locations with the Contractor, and take requisite field measurements. Dokken Engineering will develop revised span layout options for relocating affected pier foundations and attend virtual and in- person meetings with the City and Construction Management team to verify assumptions and gain consensus for the final proposed span configuration of the relocated pier foundations. Upon consensus with the City and Construction Management team, Dokken Engineering will revise the bridge analysis models to develop foundation loads to transmit to the Geotechnical Engineer of Record for their analysis of revised pile lengths. The Dokken team will conduct a 3rd Party Peer review of the Geotechnical Engineer of Record’s final analysis and revised Bridge Foundation Memorandum and report all findings and recommendations to the City.
Lump Sum Engineering Fee of $65,000
Structural Calculations and Independent Check: Upon consensus with the City and Construction Management team, Dokken Engineering will finalize the initial bridge remodeling of the superstructure and substructure support systems and develop revised structural calculations to support the redesign of the precast concrete girders for spans 7 -9, the substructures for piers 6- 9, abutment 10, and the overall global seismic ductility displacement capacity check for the Vista Canyon Bridge. Dokken Engineering will prepare an organized and indexed package of the Bridge Redesign Calculations for review by the City of Santa Clarita.
Dokken Engineering will meet with the City’s review team and respond to any comments received on the Bridge Redesign Calculation package in a timely manner and expedite resubmittal to the City for approval.
Lump Sum Engineering Fee of $100,000
1450 Frazee Road, Suite 100, San Diego, CA 92108 Tele: 858 514-8377 Fax: 858 514-8608 www.dokkenengineering.com
Revised Contract Change Order Bridge Plans : Upon consensus with the City and Construction Management team, Dokken Engineering will prepare Contract Change Order plan sheets for the Vista Canyon Road Bridge to reflect the revised span configuration, revised foundation data table, and accommodate changes required to the other structural components resulting from the updated Bridge Redesign Calculations. All revised details on the Contract Change Order plan sheets submitted to the City for review will be signed and stamped by the Bridge Engineer of Record and will include clouded revisions to provide clarity to the City, Construction Management team, and construction Contractor of which details and components of the bridge are affected by the reconfiguration of spans 7- 9 on the Vista Canyon Road Bridge. Dokken Engineering will meet with the City’s review team and respond to any comments received on the Vista Canyon Bridge Contract Change Order Plans in a timely manner and expedite resubmittal to the City for approval.
Lump Sum Engineering Fee of $35,000
The proposed amendment fee for providing the Re-Design of Spans 7 -9 for the Vista Canyon Road Bridge over the Santa Clara River is $200,000, lump sum, to be paid in increments towards the successful completion of the following milestones:
• Completion of Preliminary Layout Approval and Foundation Loads: $65,000 • Completion of Structural Calculations and Independent Check: $100,000 • Completion of Revised Contract Change Order Plans Bridge Plans: $35,000 Amendment No. 2 Lump Sum Total: $200,000
If you have any questions or wish to discuss this proposal in further detail, do not hesitate to give me a call at (858) 514-8377, or contact me by email at [email protected] Sincerely,
DOKKEN ENGINEERING
Charles Tornaci, PE
Project Manager