Item No.        8h_supp
Date of Meeting       June 8, 2021
North Employee Parking Lot Improvements
Design Authorization

Project Location
North Employee Parking Lot
S 146th St
(NEPL)
th Ave S
Parking for airport employees
24
4,122 parking stalls
11,170 parking permits
(maximum 12,000)

N
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Project Purpose
Purpose:
Extend the life of the North Employee Parking Lot and improve
customer service and operational support.

Phasing:
Phase I: Improvements to the Bus Shelters and limited site features
Phase II: Improvements to the parking areas including pavement,
signage, and underlying infrastructure
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Project Scope  Phase I
Remodel of Bus Shelters
(restrooms and interiors)
Permanent operational support
area in Shelter 1 (including Wi-Fi)
Code required monument sign
modifications
Replacement of vehicle gate
Expansion of electric vehicle
parking utilizing existing
infrastructure
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Project Scope  Phase II
Pavement and signage renewal
Replace failing water main
Replace failing storm water
channel drains
Replace failing rockery retaining
wall
Assessment of expansion of
electric vehicle parking*

5

Project Budget  Phase I
Commission authorization for design   Budget increase due to:
and construction October 2018         Cost estimate error for General
Conditions ($444,000)
Original Budget: $615,000
Port Standards/Accessibility
Revised Budget: $1,595,000              Requirements ($166,000)
Wi-Fi Discretionary Change
($61,000)
Stop/Restart COVID-19 Delay
($309,000)

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Project Schedule  Phase I
Key Schedule Milestones:
Design Start: May 2019
Design Delayed: June 2020
Design Restarted: January 2021
Construction Start: Q1 2022
In-Use Date: Q3 2022

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Project Budget  Phase II
Original Budget: $6,020,000          Budget increase due to:
Revised Budget: $13,805,000          Scope additions to replace failing
infrastructure
Retaining Wall ($2,403,000)
Water Line ($2,156,000)
Stormwater Drains ($251,000)
Port Standards ($1,168,000)
COVID-19 Delay ($794,000)
Additional Risks ($633,000)
Additional Soft Costs ($380,000)
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Project Schedule  Phase II
Key Schedule Milestones:
Design Start: June 2021
Early Work: Q3 2021
Construction Start: Q2 2022
In-Use Date: Q3 2023


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Cost Certainty

NEPL Phase II              NEPL Phase I




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Lessons Learned from other Projects
Past Lesson Learned                      Project Application
Guide specification calls for Engineer to provide      Guide specification will be revised to require tack
direction on tack coat application for pavement      coat application for pavement overlay
overlay
Access for landscape maintenance is problematic    Consider maintenance access as part of
on steep slopes                                    replacement retaining wall design
Project Manager planned additional project         Determine potential for substandard pavement
contingency to support risk of substandard          section during design and consider additional
pavement section in bus area                       project contingency to support construction phase
Asphalt pavement section at bus stops does not     Aviation to update standards requiring a Portland
support employee parking busing operation         cement concrete pavement section at bus stops
Asphalt pavement section at bus stops does not     Aviation to update standards requiring a Portland
support employee parking busing operation         cement concrete pavement section at bus stops

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Project Risks  Phases I and II
Risk            Description       Probability  Impact      Mitigation Plan
Compliance issues    Restroom revisions to support                             Considering non-gender
accessibility compliance may          H             M      specific and accessibility
be more costly                                             compliant restroom
Regulatory issues     Regulatory requirements                                    PM working with designer to
increase costs (e.g., code              M             M       determine scope and cost
required conductor removal)                               impacts
Construction Bid      Cost of acquiring contractors                                Project will be bid as a unit
in a competitive construction          L             M      price contract to reduce
environment (anticipated in                                 contractor risk
2022)
Additional Failure     Rockery retaining wall will                                     Place barriers in places of
continue to fail prior to                 M              L       failure; monitor wall condition
construction

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