COMMISSION 
AGENDA MEMORANDUM                        Item No.          8f 
ACTION ITEM                            Date of Meeting      January 26, 2021 
DATE:     December 21, 2020 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Kenneth Lyles, Director, Maritime Operations and Security 
Jo Woods, Senior Manager, Recreational Boating 
Mark Longridge, Capital Project Manager 
SUBJECT:  Authorization for Design and Permitting of the Shilshole Bay Marina X-Dock
Rehabilitation (CIP # C800570) 
Amount of this request:                 $400,000 
Total estimated project cost:          $1,670,000 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to complete design and permitting
for the rehabilitation of the X dock fixed pier at Shilshole Bay Marina (SBM) in the amount of
$400,000 of a total preliminary estimated project cost of $1,670,000 
EXECUTIVE SUMMARY 
Shilshole Bay Marina serves a broad range of recreational boating customers including moorage
tenants, a liveaboard community, youth sailing education, dry boat storage and the general
public. Use of the north end pier at X Dock with its vessel hoists provides access to the water for
those with boats in the dry storage area and for the public as well. The X Dock facility is located
adjacent to the dry boat storage yard and consists of a fixed pier made of timber piles, two jib
cranes for launching vessels, a gangway, and a floating dock structure.
This project will remove and replace the current creosote timber piles supporting the fixed pier 
and replace them with a steel pile system. The current plan is to retain the current superstructure
as it is in serviceable condition and retaining it provides the best lifecycle use of the asset. 
The floating docks at the north end of Shilshole Bay Marina were replaced in 2008 as part of the
major waterside capital development, and while they are performing well, the wooden fixed pier 
from the docks to the seawall is the original wooden structure built in 1966 as a pair of finger
piers, then revised to one solid pier in the mid-seventies. The pier has several piles in poor and
deteriorated condition. A project to replace or repair the pier has been included in the capital
plan since at least 2012. 

Template revised January 10, 2019.

COMMISSION AGENDA  Action Item No. _8f_                                 Page 2 of 5 
Meeting Date: January 26, 2021 
This pier is used by the dry moorage customers to launch and retrieve boats, as well as by racing
fleets at Shilshole, and is also available to the public to launch vessels when renting the jib crane.
In addition, research vessels use the facility to off-load instruments.
The current plan is to replace the piles and retain the existing superstructure under the Port's
Pile Systems Repair & Maintenance Programmatic permit, substantially shortening the local,
state and federal permitting time required for the work. A building permit from the City of Seattle
SDCI is still expected to be required under any option.  The design will include provisions to
replace the superstructure at a later date when the existing deck and stringers reach the end of
their serviceable life. 
JUSTIFICATION 
The jib cranes and fixed pier are used by the over 80 north-end dry storage tenants to launch
vessels and also by seasonal racing fleets participating in races hosted at the marina, along with
the public renting the jib crane. Rehabilitation of the structure will allow continued use of the jib
cranes for water access and maintain the viability of the facility.
Throughout the last several years, the Port has been replacing aging treated timber systems at
many of our facilities as they reach the end of their life and replacing them with steel systems
that are longer lasting, more environmentally friendly and stronger than the timber systems they
replace. 
The current structure is supported by the original 20 creosote timber piles which are now
reaching the end of their service life. Several have been previously repaired or show section loss
and deterioration. By replacing this support system with steel piles, it is expected we can reduce
the total number of piles, improve environmental conditions,  and provide a significantly
increased life of over 30 years. The current superstructure and decking are in good condition and
will be retained to get full use out of the structure. The design will account for the eventual full
replacement of the structure. 
Diversity in Contracting 
Project team is leveraging an existing IDIQ contract that has an overall WMBE aspirational goal
of 10%. 
Stakeholder Communication and Outreach 
The project team will coordinate with External Relations and marina operations to provide
project updates to moorage customers, upland tenants and marina neighbors regarding
construction activities. 


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

COMMISSION AGENDA  Action Item No. _8f_                                 Page 3 of 5 
Meeting Date: January 26, 2021 
DETAILS 
Scope of Work 
Overall project scope will include the replacement of 20 existing creosote support piles with a
steel pile frame to support the existing wooden superstructure. It is expected that fewer piles
may be needed which will be confirmed during design. 
Design and permitting scope under this authorization will  include preparation of plans,
specifications and estimates for completing this work, and coordination of all applicable permits
required for in-water work to complete the work. 
Schedule 
All in-water work for the installation of the new piles must be completed within the permitted
fish window between July 16 and February 15th of each year, while above water work may
continue after this time period (braces, cross beams etc.). While a significant portion of the 
construction window occurs during the off-peak season for the facility, the project team will work
closely with operations staff to minimize impacts to tenants and users. 
Initial Schedule assumptions: 
Notebook Completion                        December 2020 
Commission Design Authorization               January 2021 
Consultant design service directive executed    January 2021 
Design begins 
Design & Permitting Complete                 September 2021 
Advertise construction                           October 2021 

This work will require a Seattle Department of Construction & Inspections (SDCI) building permit
for replacement of the load bearing piles.  Review times for this permit process have been
lengthening and will likely be the critical path for this work schedule. 
Cost Breakdown                                     This Request           Total Project 
Design                                                    $400,000               $450,000 
Construction                                                     $0              1,220,000 
Total                                                           $400,000              $1,670,000 




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

COMMISSION AGENDA  Action Item No. _8f_                                 Page 4 of 5 
Meeting Date: January 26, 2021 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1  Defer rehabilitation of X dock and continue to monitor its condition. 
Cost Implications: Low initial cost to monitor condition alone.  This would not include any
potential damage to structure which would be considerably more expensive to repair. 
Pros: 
(1) Lower initial capital cost. 
(2) Allows continued use without construction shutdowns. 
Cons: 
(1) Increasing risk to the structure if kept in use. 
(2) Significant risk of needing further load restriction up to and including full closure, heavily
impacting Shilshole North Dry Storage lot tenants. 
(3) If the structure fails or needs to be closed it would not be able to reopen until fully
redesigned and permitted (approx. 18 months). 
(4) Construction costs continue to escalate so replacement would likely cost more in the
future, and still may require shutdowns of the facility in the meantime. 
This is not the recommended alternative. 
Alternative 2  Full rehabilitation of the entire structure starting design in 2021. 
Cost Implications: $3,000,000 (planning level estimate) 
Pros: 
(1)   Addresses structural concerns before they become an emergency. 
(2)   Replacement would likely be steel deck supported by steel piles with longer life
expectancy than timber (2-3x) 
Cons: 
(1)   Significantly higher capital cost. 
(2)   Longer construction duration would keep facility out of service for tenants longer 
(3)   Full replacement could not be achieved under the existing programmatic permit and
would take significantly longer (12-15 months). Construction would not be viable until
the 2022-3 fish window 
This is not the recommended alternative. 
Alternative 3  Full rehabilitation of the supporting structure starting design in 2021. 
Cost Implications: $1,670,000 
Pros: 
(3)   Addresses structural concerns before they become an emergency. 

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

COMMISSION AGENDA  Action Item No. _8f_                                 Page 5 of 5 
Meeting Date: January 26, 2021 
(4)   Replacement will likely be supported by steel piles with longer life expectancy than
timber (2-3x) 
(5)   Reuse of superstructure allows for maximum utility of existing structure. 
Cons: 
(4)   Higher capital cost. 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
Cost Estimate/Authorization Summary              Capital        Expense           Total 
COST ESTIMATE 
Original estimate                                 $1,670,000               $0      $1,670,000 
AUTHORIZATION 
Previous authorizations                             $50,000                0         $50,000 
Current request for authorization                  $400,000                0        $400,000 
Total authorizations, including this request         $450,000                0        $450,000 
Remaining amount to be authorized            $1,220,000             $0     $1,220,000 
Annual Budget Status and Source of Funds 
This project is included in the 2021 Capital Plan under C800570 SBM Dock X Pier Replacement
with a total project cost of $1,670,000. 
This project will be funded by the General Fund. 
Financial Analysis and Summary 
Project cost for analysis              $1,670,000 
Business Unit (BU)                  Recreational Boating 
Effect on business performance     This project is not expected to generate any incremental 
(NOI after depreciation)             revenue and will increase depreciation expense by
approximately $56K per year. 
IRR/NPV (if relevant)                N/A 
CPE Impact                       N/A 
ATTACHMENTS TO THIS REQUEST 
(1)   Presentation slides 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
None. 

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