8b. Passenger Loading Bridge presentation
Item No. 8b_supp Meeting Date: September 10, 2019 Passenger Loading Bridge (PLB) Replacement Additional Funding Commission 9/10/19 PLB Project Locations Nine (9) PLB's were approved for replacement under CIP #800793 Three (3) have been completed (Green) Three (3) are designed (Yellow) Three (3) will start design early in 2020 (Red) 2 2 Cost Drivers Discovery of subterranean lines Lack of as-builts for existing Passenger Loading Bridge foundations Foundation expansions to meet new seismic code requirements Hydronic isolations for Pre-Conditioned air system 400 Hz aircraft power system replacement and upgrades Electronic Ground Support Equipment charging station and other building interference 3 Project Cost Drivers Gate S11 Construction challenges One of the foundation bolts had been destroyed and Original another was damaged Foundation location New Foundation and anchor A new foundation was required bolts A water line runs right through the rotunda foundation New seismic code requirements Long fixed walkway Increased mechanical cost Budget Original Estimate: $1,100,000 Actual Cost: $1,429,000 4 Project Cost Drivers Gate S6 The PLB failed prior to the scheduled replacement Resources were reassigned to expedite the bridge replacement Other bridges that were in design were delayed Construction challenges Unidentified foundation conditions Existing foundation modification did not meet seismic code, requiring demolition and new expanded foundation Aircraft Power was consolidated into one larger supply box Budget Original Estimate: $1,100,000 Actual Cost: $1,211,000 5 Project Cost Drivers Gate C15 Construction challenges Water line located within the planned foundation expansion Location of an unknown industrial wastewater system line Drilled shaft foundation Addition of an extended corridor section New 400 Hz aircraft power unit needed as existing PLB did not have one Budget Original Estimate: $1,100,000 New Estimate: $1,341,000 6 Project Cost Drivers Gate D4 Construction challenges Hydronics System No Isolation valves at the individual gates; isolation valves will need to be installed before PLB can be replaced Long length of piping along the fixed walkway Original Estimate: $1,100,000 New Estimate: $1,365,500 7 Project Cost Drivers Gate B10 Construction challenges Integrated Wastewater System lines surround the existing foundation Three Manholes Abandoned Fuel line Mitigation and removal Drilled shaft foundation and extended corridor to minimize impacts to Pre-Conditioned air Water collection and treatment plan Budget Original Estimate: $1,100,000 New Estimate: $1,491,000 8 Project Cost Drivers Gate D11 Construction challenges Fixed walk way foundations Two drilled shaft foundations are needed (Fixed walkway) One spread footing (Rotunda) Electrical system identification Multiple electrical systems are run on the fixed walkway that are not part of PLB Will require cutover and new design for hazardous waste building Pre-Conditioned Air valves do not isolate fixed walkway Budget Original Estimate: $1,100,000 New Estimate: $1,377,500 9 Project Cost Drivers Gate C11 C11 Construction challenges Water line located within the planned foundation expansion Drilled shaft foundation Addition of an extended corridor section C15 Budget Original Estimate: $1,100,000 New Estimate: $1,229,500 10 Project Cost Drivers Gate C18 Construction challenges Double fixed walkway Long Hydronics runs (Pre-conditioned air system) Electronic Ground Support Equipment system charging station Interference Foundation interferences Budget Original Estimate: $1,100,000 New Estimate: $1,569,500 11 Project Cost Drivers Gate C9 Construction challenges Concourse C 400 Hz airplane power generation system Major works Separate set of drawings/documents Foundation interferences Budget Original Estimate: $1,100,000 New Estimate: $1,816,500 ($716,500) 12 Additional Funding Request Request: increase the project authorization by $3,000,000 Total project estimate: $13,000,000 Complete the replacement of the nine (9) scheduled bridges 2015 Project Estimate per PLB: $1,100,000 2019 Average per PLB: $1,425,611 13
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