8e Presentation Passenger Loading Bridge Renewal and Replacement Phase 3
Item No. 8e_supp Meeting Date: January 12, 2021 Passenger Loading Bridge (PLB) Replacement Phase 3 Tyler Salisbury Project Manager, AV-PMG Background PLBs are one of the highest used pieces of equipment at SEA. Approximately 75 active bridges in 2019, SEA saw an average of 336,000 passengers per PLB. Compared to a national average of 220,000 passengers per PLB for the top 20 airports. Bridges have a 25-year service life Bridge failures have a significant impact to operations and customer experience. New technologies to improve turnaround time and customer experience. Safedock, Improved Wifi, and JetDock. 2021 Construction season Opportunity with NSAT 2022 Construction season Looking for opportunities with airfield pavement project 2 Location & Overview Replace 7 Passenger Loading Bridges 4-Year Program (2021-2024) Concourse C & D What is Involved? Foundation Bridge foundations are being brought up to the current building code. Drilled shaft (35'-45' deep with 8'x8'x4' Cap) Expanded footing (18'x18' foundation) What's Involved? Bridge What is new? Fixed walkway section Bridge section Support columns Control/Communication boxes 400 Hz system refresh New Gate boxes Ethernet connections Upgraded Controls and safety sensors Prep for future improvements New interior! No carpet! Risks Gate outage scheduling Limited number of gates that can be out for construction and other project delays can affect the PLB replacement schedule. Competing projects for the dry weather construction window. Unknown Subgrade Foundation excavations have uncovered unknown structures not identified during the survey activities. Underground piping was identified prior to construction. However, it was not where it had been identified. Opportunities Gate Outage Scheduling Potential for overlapping project schedules with gate outages (Airfield pavement and Mega projects). Changing bridge replacement order to align with other projects. Frequent coordination meetings with AV-Ops and other projects that have gate outages. Gates C18 and C20 are being accelerated to take advantage of gates opening at the north satellite Alternative procurement methods Design Build approach to increase the number of replacements in a year. Cone of Certainty W e are here Alternative 1 Delay Project Cost Implications: Approximately $20,000 would need to be expensed; potential for additional costs if PLB fails during delay and is rushed to be replaced. Pros: Delayed capital investment Cons: Bridges will be operating beyond their service life Increased replacement cost and time if replaced as an emergency Future replacement projects may cost more Increased risk of gate outages Other projects will be needed to replace smaller components of the bridge to keep functional Outdated technology may not support other bridge improvements (Safedock, Jetdock) 9 Alternative 2 PLB Bridge Replacement Only Cost Implications: $13,500,000 Pros: Replace all 7 PLBs that are at end of service life Upgrade bridge foundations to meet current code Install new equipment with capacity for future improvements Cons: Higher capital investment Does not replace the 400 Hz gate boxes that are near or beyond end of life A future project and shutdowns will be required to replace 400 Hz gate boxes 10 Alternative 3 PLB Bridge Replacement and New 400 Hz Gate Boxes Cost Implications: $14,000,000 Pros: Replace all 7 PLBs that are at end of service life Upgrade bridge foundations to meet current code Install new equipment with capacity for future improvements Replace 7 Aging 400 Hz gate boxes Cons: Highest capital investment 11
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