COMMISSION 
AGENDA MEMORANDUM                        Item No.          8b 
ACTION ITEM                            Date of Meeting     February 13, 2018 
DATE:     January 2, 2018 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Srini Pendikatla, Program Manager Marine Stormwater Utility 
Curtis Stahlecker, Capital Project Manager 
SUBJECT:  Terminal 18 Stormwater Outfall Renewal and Replacement (CIP #C800895) 
Amount of this request:               $2,985,000 
Total estimated project cost:          $4,000,000 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to perform the construction
activities for the Terminal 18 Stormwater Outfall Renewal and Replacement project using a
combination of Port crews, small works contracts, and reimbursable tenant work for an amount
not to exceed $2,985,000 out of a total estimated project cost of $4,000,000. 
EXECUTIVE SUMMARY 
This project will protect water quality of Puget Sound by; 1) Using tide gate valves to prevent 
tidal waters from entering and flowing within the drainage system; 2) Repairing broken and
cracked pipes preventing ground water and soil from migrating into the stormwater system and
ultimately entering the waterway.
This is the first capital project in support of the Marine Stormwater Utility (Utility) to repair and
replace stormwater outfalls located at Terminal 18. The project is funded by revenue collected
from the Port of Seattle (Port) and Northwest Seaport Alliance (NWSA) tenants based on
current approved rates. The work focuses at the terminus of the stormwater drainage systems, 
from the last manhole to the outfall,  and includes re-grading the pipes, replacing nonfunctioning
tide gate valves and repairing broken pipes. 
Due to the operational impacts on tenant operations, the work will be phased over the next
three years. The work will be executed using a combination of Port crews, small works projectspecific
contracts, and open-order contracts to minimize schedule and cost risk. 
JUSTIFICATION 
The Port's Marine Stormwater Utility was established in November 2014, and an Interlocal
Agreement with the City of Seattle was signed on November 9, 2016.  The Utility has 

Template revised September 22, 2016.

COMMISSION AGENDA  Action Item No. 8b                                  Page 2 of 6 
Meeting Date: February 13, 2018 
jurisdiction over the NWSA North Harbor managed properties and Port of Seattle properties
and facilities. 
In 2016, the Utility began collecting drainage fees to be used for a comprehensive investigation
and assessment of the stormwater infrastructure, and  to pay for system rehabilitation. 
Terminal 18 is at the forefront of system rehabilitation due to the system size, importance to
the container shipping network, and the requirement for improved treatment systems for
industrial stormwater, which the tenant is in the process of installing in a number of upland
basins. 
There are 13 outfalls located at Terminal 18, installed in the 1960s and 1970s, which are owned
and maintained by the Port.  Given the age of the systems, the outfalls have performed well
over the years; however, there are a number of deficiencies that need to be addressed to
protect the Port's assets and help protect the water quality of Puget Sound. 
DETAILS 
Most of the 13 outfalls located on the East Waterway of Terminal 18 have non-functioning or
missing tide gate valves, several of the pipes are broken where they pass through the bulkhead,
and other pipes have settled, causing ponding to occur within the pipes. This project will repair
the broken pipes, correct the grade issues, and install new tide gate valves. 
Benefits of this project include maintaining the integrity of the environmental controls
established by the Superfund record of decision. Additional benefits include preventing
infiltration of groundwater and flow of tidal waters into the stormwater system, protecting the
water quality of the East Waterway; reducing corrosion within the pipes from corrosive ocean
salt water; reducing maintenance and cleaning within the stormwater pipes; and contributing
to meeting Century Agenda Strategy 4, Objective 13  Meet or exceed agency requirements for
stormwater. 
Close coordination with the tenant is required for the outfall construction activities to address: 
1) Tenant terminal operations and variabilities in shipping schedules; 2) Installation of tenant
stormwater treatment system in close proximity to the outfalls; 3) Unknowns associated with
excavating within an EPA Superfund site. To achieve this close coordination, and reduce project
uncertainties in cost and schedule, we recommend using Port crews, and project specific and
small works contracts to execute the work. 
Additionally, due to the close proximity of one outfall to the tenant installed treatment system, 
the repair of that outfall will be accomplished by the tenant contractor and reimbursed under a
letter of agreement with the tenant. 


Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. 8b                                  Page 3 of 6 
Meeting Date: February 13, 2018 
Scope of Work 
The scope for this project will concentrate on making repairs to the outfalls from the tide gate
valve at the end of the pipe to the first manhole upstream, and will include the following: 
(1) New tide gate valves, 
(2) Realign the grade to correct the drainage slope, 
(3) Repair broken pipes, and 
(4) Line pipes to prevent groundwater infiltration where feasible. 
Small Business 
In conjunction with the Port of Seattle's Small Business Generator Program's (PortGen)
outreach activities, the leveraging of Small Works contracts will help maximize small business
participation for this project.  Historically, Small Works have produced high levels of small
business participation for the Port. 
Schedule 
Design and site investigation work began in the second quarter of 2017. Installation of cure-inplace
pipe lining of up to two stormwater lines was initially planned during the third quarter of
2017 but was postponed due to the design and permit schedule. This work will be carried
forward with the balance of construction phased over the next three years. 
Phasing of the project is recommended as the work is located very near and under the dock, 
making the construction activity disruptive to the terminal operations. To mitigate the terminal
disruptions, the work will require close  coordination  with tenant, and where practical, 
sequenced  with the tenant construction activities conducted to  install the stormwater
treatment systems. 
Commission design authorization               Q2 2017 
Commission construction authorization          Q1 2018 
Construction start                                Q1 2018 
In-use date                                       Begin Q4 2018 
Cost Breakdown                                     This Request           Total Project 
Design                                                           $0               $800,000 
Construction                                             $2,985,000             $3,200,000 
Total                                                         $2,985,000              $4,000,000 



Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. 8b                                  Page 4 of 6 
Meeting Date: February 13, 2018 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1  Postpone action and monitor the condition of Terminal 18 Outfalls for future
action 
Cost Implications: $25,000 to $50,000 annual monitoring costs 
Pros: 
(1)   Allows Utility funds to be used at other facilities. 
Cons: 
(1)   Does not address the failing stormwater infrastructure and compromises quality. 
(2)   Current conditions will continue to deteriorate and require increased operations &
maintenance expenditures for temporary repairs. 
(3)   Would not provide the opportunity to phase the work with the tenant construction of
stormwater treatment, minimizing terminal disruptions. 
This is not the recommended alternative. 
Alternative 2  Perform the Terminal 18 Outfall Project in a single construction phase
Cost Implications: Project costs are estimated to be $3.75 million 
Pros: 
(1)   Slightly lower cost with fewer mobilizations. 
(2)   Corrects the identified system deficiencies of inoperable tide gate valves, broken and
off-grade pipes. 
(3)   Protects the water quality entering Puget Sound. 
(4)   Protects the existing infrastructure from further damage. 
(5)   Expected life of rehabilitated infrastructure is 50 years. 
Cons: 
(1)   A single construction phase would significantly impact the terminal operations due to
limited working area along the wharf to concurrently handle cargo and repair the 13
outfalls. 
(2)    A single phased approach would be compounded by the coordination and space
constraints along the wharf due to the tenant installing stormwater treatment system 
directly upstream of each outfall. 
(3)    Utility funding of a single construction phase would be deferred until 2020 due to
funding limitations. 
This is not the recommended alternative. 


Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. 8b                                  Page 5 of 6 
Meeting Date: February 13, 2018 
Alternative 3    Move forward with the Terminal 18 Outfall Project  using a phased
construction approach 
Cost Implications: Project costs are estimated to be $4 million 
Pros: 
(1)    Corrects the identified system deficiencies of inoperable tide gate valves, broken and
off-grade pipes. 
(2)    A phase approach allows opportunity to adjust the design or construction processes in
the subsequent phases to accommodate unforeseen conditions and minimize risk. 
(3)   Protects the water quality entering Puget Sound. 
(4)   Protects the existing infrastructure from further damage. 
(5)   Expected life of rehabilitated infrastructure is 50 years. 
(6)   Capital funds for this project are budgeted in the 10-year budget forecast and 10-year
cash spending forecast. 
Cons: 
(1)   Requires the expenditure of $4 million in capital costs. 
(2)   The execution of this project may limit or postpone funding of other Utility supported
projects. 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
Cost Estimate/Authorization Summary              Capital        Expense           Total 
COST ESTIMATE 
Original estimate                                 $4,000,000               $0      $4,000,000 
AUTHORIZATION 
Previous authorizations                          $1,015,000                0      $1,015,000 
Current request for authorization                $2,985,000                0      $2,985,000 
Total authorizations, including this request       $4,000,000                0      $4,000,000 
Remaining amount to be authorized                    $0             $0             $0 
Annual Budget Status and Source of Funds 
The project was included in the 2018 plan of finance under CIP #C800895 in the amount of
$4,010,000. This project will be funded by the Marine Stormwater Utility fund. 
Financial Analysis and Summary 
Project cost for analysis              $4,000,000 
Business Unit (BU)                  Marine Stormwater Utility 
Effect on business performance     This project will increase depreciation expense by
(NOI after depreciation)             $80,000 per year after the project is completed in 2020. 

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. 8b                                  Page 6 of 6 
Meeting Date: February 13, 2018 
IRR/NPV (if relevant)                The NPV of this project is the present value of the project
cost and annual maintenance costs. 
CPE Impact                       NA 
Future Revenues and Expenses (Total cost of ownership) 
No future revenues are anticipated as a result of this project. The expenses for maintenance are
estimated to be $25,000 in 2021 with 3.5% inflation rate thereafter. 
ADDITIONAL BACKGROUND 
The Port of Seattle Commission established Stormwater Utility in 2015. With the establishment
of the Marine Stormwater Utility, the stormwater drainage fees that were previously paid to
the City of Seattle are now collected and retained by the Port to support the Marine
Stormwater Utility's objectives. These objectives include: 
Assess condition of Stormwater lines and related structures 
Identify urgent repairs, and prioritize and complete those repairs 
Identify and characterize longer term capital improvements that could contribute to
system rehabilitation and protect stormwater quality entering Puget Sound. 
ATTACHMENTS TO THIS REQUEST 
(1)   Presentation slides 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
April 25, 2017  Port of Seattle Commission authorized design funding 








Template revised September 22, 2016; format updates October 19, 2016.