10d Memo 2021-2025 Airfield Pavement Replacement

COMMISSION 
AGENDA MEMORANDUM                        Item No.          10d 
ACTION ITEM                            Date of Meeting     November 10, 2020 
DATE:     October 30, 2020 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Laurel Dunphy, Director, Aviation Operations 
Wayne Grotheer, Director, Aviation Project Management 
SUBJECT:  2021-2025 Airfield Pavement and Supporting Infrastructure Replacement Program
(CIP #C800930)
Amount of this request:              $37,900,000 
Total estimated project cost:        $153,500,000 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to (1) advertise and execute a
major works construction contract and (2) include a project labor agreement  for the
replacement of distressed pavements and supporting infrastructure for the 2021 portion of the
2021-2025 Airfield Pavement and Supporting Infrastructure Replacement Program at the
Seattle-Tacoma International Airport. This construction authorization is for $37,900,000 for a
total authorization to date of $51,395,000. The total 2021-2025 program cost is $153,500,000. 
EXECUTIVE SUMMARY 
An ongoing program of airfield pavement maintenance and replacement is required to provide
safe and efficient conditions for aircraft operations and meet FAA requirements; the 2021-2025
Airfield Pavement and Supporting Infrastructure Replacement Program is a continuation of the
programmatic approach of replacing distressed airfield pavement (concrete and asphalt), joint
sealant, and related and supporting infrastructure at the Airport. The Airport's Pavement
Replacement Management Program supports the FAA mandated Pavement Maintenance
Management Program (PMMP), which identifies pavement replacement priorities and is
directly  related  to  grant  funding.  With  many  of  the  pavements  and  supporting  airfield
infrastructure having long exceeded their planned lifespan, a robust pavement and utility
infrastructure replacement program is required.
The 2021 project is the first year of the 2021-2025 Airfield Pavement and Supporting
Infrastructure Replacement Program. The pavements and utility infrastructure identified for
this 2021 project have been determined by annual pavement inspections and reporting. The
scope of the 2021 project focusses on those assets having the three following criteria: (1)

Template revised January 10, 2019.

COMMISSION AGENDA  Action Item No. _10d_                               Page 2 of 6 
Meeting Date: November 10, 2020 
exceptionally high age, (2) continual need for repair, and (3) high strategic value to airfield
operations. 
The 2021 project was included in the 2021-2025 capital plan and the funding sources will be the
Airport Development Fund, FAA AIP grants, and revenue bonds. 
JUSTIFICATION 
The Airport has approximately 21,850,000 square feet of runway, taxiway, taxilane, and apron
pavement. To comply with the Federal Aviation Administration Pavement Management
Program requirement, the Airport must complete yearly pavement inspections detailing
pavement conditions according to specific FAA criteria.
These yearly inspections support FAA project funding requests and aid in the development of
prioritized work plans. Most airfield pavements included in this project have far exceeded their
20-year design service life and lack the thickness to support the weight and volume of the
Airport's aircraft operations; thesepavements have become cracked and damaged. Damaged
and distressed concrete and asphalt produce loose gravel and rock (Foreign Object Debris
"FOD") which is then pickedup by vehicle tires or blown by jet engine exhaust and spread
across the apron, taxiways and runways.  Loose debris then becomes a major hazard when
ingested into an aircraft engine, causing significant and costly damage. Boeing estimates that
FOD causes an estimated $4 billion in damage to engines and aircraft taken out of service each
year. 
Previous pavement and utility investments over the last 20 years have focused on the airfield's
runway and connecting taxiway system (i.e., the Movement Area). The apron and taxilanes 
around the terminal areas (i.e., the Non-Movement Area) have been managed through a focus
on individual replacement of failed panels. This ad hoc approach does not result in a logical
progression of planned investments and is ineligible for federal grant funding. 
The 2021-2025 program replaces aging and damaged pavements and utilities with an emphasis
on the taxilane centerline areas around the terminals, which receive the highest traffic. This
program focuses on strategic assets, combines work to make the most of grant funding, and
performs phasing work to reduce airline impacts. 
Replacing distressed pavement and supporting infrastructure on the airfield supports the longterm
strategy of the Port's Century Agenda objective to "meet the region's air transportation
needs at Seattle-Tacoma International Airport for the next 25 years." The Airport's Pavement
Maintenance Management Program maintains the integrity of airfield pavements and enables
efficient airport operations. 
The 2021-2025 Airfield Pavement and Supporting Infrastructure Replacement Program was
presented at the Airline Airport Affairs Committee (AAAC) meeting in September 2019 and the
Majority-In-Interest ballot was approved in January 2020. Design for the 5-year program was

Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. _10d_                               Page 3 of 6 
Meeting Date: November 10, 2020 
authorized by Commission in October 2019. As part of the April 2020 Commission study session
on the Capital plan, this project was included as a prioritized aviation project accomplishing the
stated aviation goals of meeting safety, operational continuity, and critical infrastructure needs,
as well as utilizing available federal funding. Additionally, the study session prioritized this
project as meeting all four guiding principles: (1) Maximize economic benefit, (2) Ensure high
M/WBE utilization, (3) Benefit small business, and (4) Advance environmental protection. 
Diversity in Contracting 
This  program  includes  federally  assisted  funding  that  requires  the  use  of  the  federal
Disadvantaged Business Enterprise (DBE) program rules, which includes the setting of DBE
goals. The Diversity in Contracting Department, along with project staff, have identified 9.4%
DBE requirements for the 2021 project.
DETAILS 
The overall purpose of the 2021-2025 program is to replace distressed and/or damaged
pavements on the airfield that will cause FOD in the aircraft operational areas. It also replaces
joint  seal  in  areas  that  are  most  problematic  or  where  missing;  and  replaces
infrastructure/utilities in close proximity to pavement work areas or in support of airfield
operations. Abandoned fuel line systems and contaminated in-situ soils will also be removed. 
Scope of Work for 2021 Project 
The 2021 project scope includes the following items: 
Work Area S -  Replacement of the Portland Cement Concrete Pavement (PCCP) and
supporting infrastructure on the south side of the South Satellite. 
Work Area C - Replacement of PCCP, the adjacent Asphalt Concrete Pavement vehicle service
road and supporting infrastructure at Cargo 4. 
Work Area R/T- Replacement of PCCP joint sealant materials along RW 16R/34L, Taxiway T
and associated connector taxiways. 
The 2021 project will be constructed between April and November 2021. The construction
phasing plan was developed to minimize the impacts from construction to airlines and airfield
operations.  In addition, technical reviews and a Construction Safety Risk Management Panel
were conducted in the second quarter of 2020 with the FAA, Airlines, Ramp Tower and Airport
Operations to identify safety hazards during construction and documented mitigations to 
ensure safe airfield operations during construction. The final report from the Safety Risk
Management Panel was approved by the FAA in August 2020. 
A project labor agreement was evaluated in collaboration with Port of Seattle Labor Relations
and will be used based on the location and complexity of this project and the importance of
labor continuity and stability to minimize the operational impacts during construction. 


Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. _10d_                               Page 4 of 6 
Meeting Date: November 10, 2020 
Schedule for 2021 Project 
Activity 
Commission construction authorization       2020 Quarter 4 
Construction start                             2021 Quarter 2 
In-use date                                    2021 Quarter 4 
Cost Breakdown                                      This Request           Total Project 
Design                                                           $0            $13,495,000 
Construction                                            $37,900,000          $140,005,000 
Total                                                        $37,900,000           $153,500,000 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1  Postpone the replacement of the distressed and damaged airfield pavement
and supporting infrastructure included in 2021 Scope to 2022 or beyond. 
Cost Implications:  Increases the total program cost from $153,500,000 to $161,100,000. 
(Postponing the 2021 scope to 2022 will end up postponing the remaining annual scope to the
following year or beyond). 
Pros: 
(1)   Reduced capital spending in 2020 and 2021. 
(2)   Less construction impacts to airport/airline operations. 
Cons: 
(1)    Continued use of aging and distressed asphalt and concrete pavement increases risk
of producing FOD and potentially increased risk of ingestion and aircraft damage. 
(2)    Delay in aging concrete replacement pushes full replacement into future, escalating
actual cost for the 2021-2025 program by over $7,000,000. 
(3)    Additional disruption to airport/airline operations in 2022 or beyond. 
(4)    Deteriorating pavement and infrastructure may cause incidents on the airfield and
lead to unplanned disruptions to airfield operations. 
(5)    Potential loss of FAA's AIP Funding. 
This is not the recommended alternative. 





Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. _10d_                               Page 5 of 6 
Meeting Date: November 10, 2020 
Alternative 2   Replace the distressed and damaged airfield pavement and supporting
infrastructure in the 2021 Scope and continue the program on schedule for the period 2021  
2025. 
Cost Implications: Keeps project on-schedule to complete within $153,500,000 budget 
Pros: 
(1) Programmatic  replacement  of  aged  and  distressed  pavements  and  related
infrastructures. 
(2) Coordination between resource assets increases efficiencies and minimizes airport and
airline operational disruption and impacts during construction. 
(3) Portions of construction are eligible for Federal Funding. 
(4) In alignment with FAA's 5-year ACIP. 
(5) Lower capital spending for the overall 2021-2025 program as compared to Alternative 1. 
(6) Takes advantage of the anticipated lower operations in 2021 as compared to 2022 or
beyond. 
Cons: 
(1) Earlier capital spending in 2020 and 2021. 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
The 2021-2025 Airfield Pavement and Supporting Infrastructure Replacement Program is
included in the annual FAA Airport Capital Improvement Program (ACIP) letter for FAA Airport
Improvement Program (AIP) Grant funding. The program will receive federal grant funding for
eligible items meeting the FAA standards and the anticipated FAA grant reimbursement over
the life of the program is $45,000,000 with $12,700,000 targeted for the year 2021. 
Cost Estimate/Authorization Summary               Capital        Expense           Total 
COST ESTIMATE 
Original estimate                               $156,300,000               $0   $156,300,000 
Prior change (transferred to C800483)           (2,800,000)                      (2,800,000) 
Revised estimate                              153,500,000               0     153,500,000 
AUTHORIZATION 
Previous authorizations                          16,295,000                0                0 
Authorization Adjustment (transferred          (2,800,000)                    ($2,800,000) 
from C800930 to C800483) 
Current request for authorization                37,900,000                0      37,900,000 
Total authorizations, including this request       51,395,000                0      51,395,000 
Remaining amount to be authorized          $102,105,000             $0   $102,105,000 


Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. _10d_                               Page 6 of 6 
Meeting Date: November 10, 2020 
Annual Budget Status and Source of Funds 
This project C800930 Airfield Pavement Program was included in the 2020-2024 capital budget
and plan of finance with a budget of $156,300,000. A budget reduction of $2,800,000 was
transferred to the Airfield Pavement Program 2016-2020 (C800483) to accelerate pavement
and supporting infrastructure work to take advantage of the lower operations in 2020. There
was zero net change to the Aviation capital budget. This project has a Majority-In-Interest from
the airlines in January 2020. T he funding sources will be the Airport Development Fund, AIP
grants, and revenue bonds. 
Financial Analysis and Summary 
Project cost for analysis              $153,500,000 
Business Unit (BU)                  Airfield movement and airfield apron 
Effect on business performance     NOI after depreciation will increase due to inclusion of
(NOI after depreciation)             capital (and operating) costs in airline rate base 
IRR/NPV (if relevant)                N/A 
CPE Impact                        Total project cost CPE of 0.41 in 2026; annual CPE of .07 
ADDITIONAL BACKGROUND 
Previous five-year pavement replacement programs have focused on individual panel repairs
and replacement  all as part of the required pavement management program  but did not
serve as a holistic program for maintaining the overall airfield pavement system. Previous
program projects have not been covered by federal grant funding. Age has caught up with
Airport pavement and a more robust pavement replacement is now required above and beyond
individual panel repair and replacement. Extensive review and identification of the 2021-2025
Airfield Pavement and Supporting Infrastructure Replacement Program is in alignment with and
is included in the FAA's five-year ACIP look ahead program.
ATTACHMENTS TO THIS REQUEST 
(1)   Presentation slides 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
October 22, 2019  The Commission authorized the Executive Director to authorize design
and preparation of construction documents for the 2021-2025 Airfield Pavement and
Supporting Infrastructure Replacement Projects at the Seattle-Tacoma International
Airport in the amount of $16,000,000 and approve the use of a project labor agreement
(PLA) for each year's construction contract. The use of a PLA will be subject to approval
by the Federal Aviation Administration (FAA) for work receiving federal funding. 


Template revised June 27, 2019 (Diversity in Contracting).

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