8e. Memo

Shilshole Bay Marina X Dock Rehabilitation

AGENDA MEMORANDUM                        Item No.          8e 
ACTION ITEM                            Date of Meeting       May 10, 2022 

DATE:     May 4, 2022 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Kenneth R. Lyles, Director of Maritime Operations and Security 
Darrell Dare, Senior Manager, Recreational Boating 
Julie Yun, Capital Project Manager 
Mark Longridge, Capital Project Manager 
SUBJECT:  Shilshole Bay Marina X-Dock Rehabilitation Construction Authorization  (CIP# 
Amount of this request:               $1,200,000 
Total estimated project cost:          $1,650,000 
Request Commission authorization for the Executive Director to advertise and execute a major
public works construction contract for the Shilshole Bay Marina X-Dock Rehabilitation. Total
request for this action is $1,200,000 for a project total authorization of $1,650,000. 
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 public. The X
Dock facility at Shilshole Bay Marina is located adjacent to the dry boat storage yard and consists
of a fixed pier supported by timber piles, two vessel hoists ("jib cranes") for launching vessels, a
gangway, and a floating dock structure. The fixed pier spanning from the docks to the seawall is
the original wooden structure that was built in 1966 as a pair of finger piers, then revised to one
solid pier in the mid-1970s. Due to sustained use, the supporting structure of this fixed pier has
several piles in poor and deteriorated condition that will need replacement. The superstructure 
(deck and stringers) of the fixed pier is in working condition and will remain in place to be utilized
to the extent of its service life. 
This project will remove the 20 creosote-treated timber piles currently supporting the fixed pier
and replace them with 13 steel piles. Creosote has been historically used as a treatment to
preserve timber in marine environments. It is made from distilled coal tar and known to release
harmful particulate matter in marine environments over time. As such, the Port has upheld an

Template revised January 10, 2019.

COMMISSION AGENDA  Action Item No. 8e                                  Page 2 of 5 
Meeting Date: May 10, 2022 
ongoing commitment to the environment by removing approximately 1,161 treated timber
pilings and replacing them with steel pile systems over the past decade. 
This project is designed 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. The construction permit for this
project has been submitted to the City of Seattle SDCI and is currently under review. 
The jib cranes and fixed pier are used by the over 80 north-end dry storage tenants launching 
vessels, seasonal racing fleets participating in races hosted at the marina, and the public renting
the jib crane. Rehabilitation of the structure will allow long-term continued use of the jib cranes
for water access and maintain the viability of the facility.
Over the past decade, the Port has replaced aging treated timber systems at many of its facilities
as they reach the end of their service life. Most of these treated timber systems have been
replaced with steel systems that are longer lasting, more environmentally friendly, and stronger
than treated timber systems. Of the total piles removed Port-wide from 2011 to 2021 under the
Pile Systems Repair and Maintenance Programmatic permit, over 95% (1,161) were creosote- or
ACZA-treated timber pilings; nearly all pilings replaced under this program were replaced with
steel pile systems. 
The current fixed pier 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 13 steel piles, we will reduce the
total number of piles, improve environmental conditions, and provide a significantly increased
service life of over 30 years. The current superstructure and decking are in good condition and
will be retained to utilize its full-service life. The supporting structure has been designed to be
compatible with the eventual rehabilitation of the superstructure. 
Diversity in Contracting 
There is a 10% aspirational goal for WMBE utilization for the construction contract. The nature
of this work lends itself to an all-or-nothing WMBE utilization, as this work is likely to be
performed entirely by the general contractor. 
Scope of Work 
This project will replace the 20 existing creosote timber support piles with 13 galvanized steel
piles and frame system to support the existing wooden superstructure. 

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

COMMISSION AGENDA  Action Item No. 8e                                  Page 3 of 5 
Meeting Date: May 10, 2022 
The project will go to bid upon SDCI building permit issuance which is expected in late-May. 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
outside of this time-period (braces, cross beams etc.). Currently, there is no significant risk
identified related to material procurement. This project will require galvanized steel piles in
relatively small quantity. The pipe size required is common to the industry and readily available
in the local market at this time. The project schedule includes float that will absorb up to 6-weeks
in delays while still allowing the in-water work to be completed within the permitted timeframe. 
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. The project team and External Relations have attended the Shilshole Dock Captains'
meeting and will continue outreach through construction to keep tenants and neighbors
Commission design authorization               January 2021 
Design start                                       January 2021 
Commission construction authorization          May 2022 
Design and Permitting Complete                May 2022 
Advertise Construction                          June 2022 
Construction Start                                October 2022 
In-use date                                       March 2023 
Cost Breakdown                                     This Request           Total Project 
Design                                                           $0               $450,000 
Construction                                             $1,200,000             $1,200,000 
Total                                                         $1,200,000              $1,650,000 
Alternative 1  Delayed/No Action. 
Cost Implications: Reduced cost for avoiding work but potential for increased maintenance costs
related to more advanced repair needs in the future. 
(1) Preserve Port capital funding and resources for other priority projects and financial
(1) Potential integrity risk to the overall pier structure due to continued deterioration. 

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

COMMISSION AGENDA  Action Item No. 8e                                  Page 4 of 5 
Meeting Date: May 10, 2022 
(2) Potential commercial/financial risk due to unplanned maintenance and implementation
of load restriction to facility operation. 
This is not the recommended alternative. 
Alternative 2  Proceed with rehabilitation of the supporting structure through a major public
works construction contract. 
Cost Implications: Allocation of $1,200,000 in the Capital Plan. 
(1)   Address deterioration of the supporting structure. 
(2)   Improved service life with steel piles, as compared to the existing timber piles. 
(3)   Replace creosote timber piles with more environmentally friendly steel piles. 
(1)   Higher upfront capital cost. 
(2)   Limited temporary construction impacts. 
This is the recommended alternative. 
Cost Estimate/Authorization Summary              Capital        Expense           Total 
Original estimate                                 $1,670,000               $0      $1,670,000 
Current change                                  -$20,000               0        -$20,000 
Revised estimate                                $1,650,000                0      $1,650,000 
Previous authorizations                            $450,000                0        $450,000 
Current request for authorization                $1,200,000                0      $1,200,000 
Total authorizations, including this request       $1,650,000                0      $1,650,000 
Remaining amount to be authorized                    $0             $0             $0 
Annual Budget Status and Source of Funds 
This project is included in the 2022 Capital Plan under C800570 SBM Dock X Pier Replacement
with a total project cost of $1,573,000. The additional cost of this project will be offset by the
Maritime Capital Reserve C800002. 
This project will be funded by the General Fund. 

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

COMMISSION AGENDA  Action Item No. 8e                                  Page 5 of 5 
Meeting Date: May 10, 2022 
Financial Analysis and Summary 
Project cost for analysis              $1,650,000 
Business Unit (BU)                  Recreational Boating 
Effect on business performance    This project will maintain current revenue from
(NOI after depreciation)             Recreational Boating. Depreciation will increase by
$82,500 per year for 20 years 
IRR/NPV (if relevant)                No incremental revenue. The NPV is the present value of
the project cost. 
CPE Impact                       N/A 
Future Revenues and Expenses (Total cost of ownership) 
Extending the useful service life of our existing assets defers eventual replacement costs for a
longer period, supporting the economic vitality of our operations. Other economic benefits
include cost effectiveness and minimum disruption to the terminal operations. 
(1)   Presentation slides 
January 26, 2021  The Commission authorized design and permitting for Shilshole Bay
Marina X-Dock Rehabilitation 

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

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