COMMISSION 
AGENDA MEMORANDUM                        Item No.          8e 
ACTION ITEM                            Date of Meeting      February 9, 2021 
DATE:     January 29, 2021 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Eileen Francisco, Interim Director Aviation Facilities and Capital Programs 
Wayne Grotheer, Director Aviation Project Management 
SUBJECT:  Budget Increase Request Industrial Wastewater System Segregation Meters (CIP
#C800655) 
Amount of this request:               $1,615,000 
Total estimated project cost:          $3,889,000 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to increase the project budget for
the Industrial Wastewater System (IWS) Segregation Meters project at Seattle-Tacoma
International Airport (Airport). The amount of this request is $1,615,000 for a revised total
estimated project cost of $3,889,000. 
EXECUTIVE SUMMARY 
This project will install four Total Organic Carbon (TOC) analyzers in the Industrial Wastewater
System conveyance serving the Airfield and Terminal Areas of the Airport. These new TOC
analyzers will provide operational data for the Port of Seattle Industrial Wastewater Treatment
Plant (IWTP). Plant operations will use the TOC analyzer data to manage wastewater treatment
and reduce the discharge of wastewater sent to Valley View Sewer District sanitary sewers and
King County South Wastewater Treatment Plant. 
Additional budget is requested to support the installation of two additional (total of four) TOC
analyzers, as well as a new concrete encased duct bank for TOC analyzer power and control
connectivity. Prior Commission action on January 22, 2019, authorized the installation and
necessary budget for only two TOC meters and did not provide for a concrete encased duct bank. 
JUSTIFICATION 
The Airport's IWS TOC analyzer project one of a series of projects that King Country Industrial
Waste Program approved in order to comply with the future effluent limits to King County South
Treatment Plant and remain in compliance with King County Industrial Waste Permit and State
National Pollutant Discharge Elimination System (NPDES) Permit.

Template revised January 10, 2019.

COMMISSION AGENDA  Action Item No. _8e___                              Page 2 of 5 
Meeting Date: February 9, 2021 
The two additional TOC analyzers are necessary for data precision and the effective segregation
of influent. The concrete encased duct bank has been deemed necessary to ensure aircraft
operations and that subsequent high pavement loading will not damage below grade cabling. 
The 2016 King County permit required the Port to identify measures to meet future reduced
effluent limitations. This IWS Segregation Meters project is the first of a series of approved capital
program improvements to improve IWTP efficiency and comply with the 2025 reduced effluent
limitations. 
Diversity in Contracting 
The Woman and Minority Business Enterprise (WMBE) aspirational goal is 10%  for the
construction project. Along with the establishment of the goal, Diversity in Contracting staff will
be outreaching to WMBE firms to inform them of the upcoming opportunities within this
procurement. 
DETAILS 
The IWS manages the Airport's stormwater associated with industrial activities from aircraft
fueling,  aircraft  deicing,  and  maintenance  operations.  The  IWS  includes  collection  and
conveyance, runoff storage, and the Industrial Wastewater Treatment Plant. The IWTP is highly
effective in treating fuel-related stormwater pollutants. However, the plant is not capable of
reducing the high Biochemical Oxygen Demand (BOD) caused by aircraft deicing operations. 
Runoff with BOD concentrations below those found to impact receiving water quality can be
discharged directly to Puget Sound after treatment for fuel-related contamination under the
Airport's NPDES permit. High BOD runoff must be pumped to the King County South Treatment
Plant via the Valley View Sewer District for secondary treatment and discharge. The IWTP's
discharges to King County are performed under a separate Industrial Waste Discharge Permit
issued by the King County Department of Natural Resources. 
The installation of the four in-line TOC meters will allow the IWTP operators to continuously
monitor influent water quality and effectively segregate high BOD runoff. Using the information
provided by the influent TOC analyzers allows the plant operators to separate high BOD water
into two lagoons (4-million-gallon capacity) and low BOD water into one much larger lagoon (76-
million-gallon capacity). This project will efficiently reduce the waste water volumes discharged 
to Valley View Sewer District and to the King County South Treatment Plant by segregating the
wastewater prior to lagoon storage. 
The existing influent TOC detection system has been abandoned due to technology, accessibility 
and maintainability issues. TOC is not currently measured until after influent water enters one of 
the high BOD lagoons 1 (1.5-million-gallon capacity) and is processed through the IWTP. Because 
the BOD is not measured until after it enters the lagoon this leads to inefficiencies by significant

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

COMMISSION AGENDA  Action Item No. _8e___                              Page 3 of 5 
Meeting Date: February 9, 2021 
dilution and increases the volume of wastewater captured and sent to Valley View Sewer District
sanitary sewers and to the King County South Treatment Plant. 

Scope of Work 
Install four Total Organic Carbon analyzers into the Industrial Wastewater System that will
sample wastewater prior to lagoon storage. 
(1)   Purpose, segregation of High and Low Biochemical Oxygen Demand (BOD/Aircraft
Deicer). 
(2)   Regulatory Requirement ensures the Port fulfills the King County Industrial Waste
Permit. 
(3)   Ensure the Port remains in compliance with the NPDES Permit. 
Schedule 
Activity 
Commission design authorization               2017 Q2 
Design start                                       2019 Q1 
Commission construction authorization          2019 Q1 
Construction start                                2021 Q2 
In-use date                                       2021 Q4 
Cost Breakdown                                     This Request           Total Project 
Design                                                    $442,000               $972,000 
Construction                                             $1,173,000             $2,917,000 
Total                                                         $1,615,000              $3,889,000 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1  Do not install four new TOC Meters 
Cost Implications: $450,000 in capital costs spent to date would need to be expensed. 
Pros: 
(1)   No further capital costs required. 
Cons: 
(1)   The Port of Seattle would not be in compliance with King County Industrial and
Washington Department of Ecology permits. 

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

COMMISSION AGENDA  Action Item No. _8e___                              Page 4 of 5 
Meeting Date: February 9, 2021 
(2)   IWTP will continue to mix low and high BOD wastewater and discharge that
wastewater for treatment at a higher cost to Port of Seattle. 
(3)   Does not ensures the Port of Seattle meets King County Discharge Permit restrictions
and the Port will not be in alignment with the All Known Available and Reasonable
Methods of Treatment initiative. 
This is not the recommended alternative. 
Alternative 2  Install four new TOC analyzers 
Cost Implications: $3,857,000 in capital is required. 

Pros: 
(1)   The IWTP will be able to segregate high and low BOD wastewater and minimize the
discharged wastewater that requires treatment to Valley View Sewer District sanity
sewers and King Country South Wastewater Treatment Plant. 
(2)   The  Port  of  Seattle  remains  in  compliance  with  King  County  and  Washington
Department of Ecology permits. 
(3)   The Port of Seattle meets King County Discharge Permit restrictions and is in alignment
with the All Known Available Reasonable Methods of Treatment initiative. 
Cons: 
(1)   Requires a capital investment of $3,857,000. 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
Cost Estimate/Authorization Summary              Capital        Expense           Total 
COST ESTIMATE 
Original estimate                                   $900,000               $0        $900,000 
Previous changes  net                          $1,342,000         $32,000      $1,374,000 
Current change                                $1,615,000               0      $1,615,000 
Revised estimate                                $3,857,000         $32,000      $3,889,000 
AUTHORIZATION 
Previous authorizations                          $2,242,000         $32,000      $2,274,000 
Current request for authorization                $1,615,000               $0      $1,615,000 
Total authorizations, including this request       $3,857,000         $32,000      $3,889,000 
Remaining amount to be authorized                    $0             $0             $0 


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

COMMISSION AGENDA  Action Item No. _8e___                              Page 5 of 5 
Meeting Date: February 9, 2021 
Annual Budget Status and Source of Funds 
This project (CIP #C800655) was included in the 2021  2025 capital budget and plan of finance
as a business plan prospective project with a total budget of $2,242,000. The budget increase is
due to support the installation of two additional (total of four) TOC analyzers as well as a new
concrete encased duct bank for TOC analyzer power and control connectivity. The budget was
transferred from the Aeronautical Allowance C800753, resulting in no net change in the Aviation
capital budget. The funding source for this project is revenue bonds. 
Financial Analysis and Summary 
Project cost for analysis              $3,857,000 
Business Unit (BU)                  Industrial Waste System Utility 
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                       $.02in 2022 
Future Revenues and Expenses (Total cost of ownership) 
Installing these TOC meters will reduce the risk of mixing high BOD wastewater to Lagoon 3.
When Lagoon 3 results into high BOD wastewater, additional sewer charges can reach up to
$400,000. Although without adequate lagoon capacities, there will always be a risk of mixing
high BOD wastewater at Lagoon 3. The long-term costs will be minimized by incorporating newer
more energy efficient equipment and components that meet the Ports mechanical and electrical
design standards for operational costs and optimum energy utilization. Maintainability will be
improved by installation of equipment with a useful life span of 20-30 years. 
ATTACHMENTS TO THIS 
(1) Presentation slides 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
January 22, 2019 The Commission authorized a budget increase of $1,132,000 for the design
and construction for an estimated total cost of $2,274,000. 
June 27, 2017 The Commission authorized design and construction for an estimated cost of
$1,142,000. 




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