Template revised September 22, 2016.
COMMISSION
AGENDA MEMORANDUM
Item No.
4g
ACTION ITEM
Date of Meeting June 27, 2017
DATE: May 5, 2017
TO: Dave Soike, Interim Executive Director
FROM: Jeffrey Brown, Director Aviation Facilities and Capital Programs
Wayne Grotheer, Director Aviation Project Management Group
SUBJECT: Industrial Wastewater System Glycol Management Improvements (CIP #C800655)
Amount of this request:
$1,092,000
Total estimated project cost:
$1,142,000
ACTION REQUESTED
Request Commission authorization for the Executive Director to (1) prepare design and
construction bid documents for the Industrial Wastewater System (IWS) Glycol Management
Improvements project at Seattle-Tacoma International Airport; (2) use Port crews and small
works contracts to purchase and install all necessary equipment and devices; (3) advertise and
award a construction contract. The amount of this request is $1,092,000 for a total estimated
project cost of $1,142,000.
EXECUTIVE SUMMARY
The purpose of this project is to reduce the amount of wastewater sent to sewage treatment
plants. This project will install two Total Organic Carbon (TOC) analyzers into the existing
Industrial Wastewater System (IWS) conveyance system serving the ramp areas on the south
half of the Airport. TOC analyzers measure the Total Organic Carbon of wastewater and that
data is correlated to Biochemical Oxygen Demand (BOD) of wastewater. High BOD in airport
wastewater systems is largely the result of Glycol used during deicing activities of aircraft.
These new TOC analyzers will provide data that the Port of Seattle Industrial Wastewater
Treatment Plant (IWTP) operators will use to manage wastewater treatment and reduce the
amount of wastewater sent to Valley View Sewer District sanitary sewers and King County
South Wastewater Treatment Plant. These TOC analyzers are desk top sized computer devices
that connect to the wastewater sampling stations.
JUSTIFICATION
Since 2006, the IWTP has discharged three times as much wastewater for treatment through
Valley View Sewer District sanitary sewers and King County South Wastewater Treatment Plant
as the design engineer originally predicted. The Port has agreements with Valley View Sewer
COMMISSION AGENDA – Action Item No. 4g____ Page 2 of 5
Meeting Date: June 27, 2017
Template revised September 22, 2016; format updates October 19, 2016.
District and King County South Wastewater Treatment Plant for the originally estimated 36
million gallons of wastewater treatment discharge per year. The Port has averaged over 125
million gallons of wastewater treatment discharge per year since 2007. The Port has on average
paid fees of $1,250,000 per year to Valley View Sewer District and King County South
Wastewater Treatment Plant. Installing these new TOC analyzers will enable the IWTP to
segregate and discharge only the wastewater that requires treatment to Valley View Sewer
District sanitary sewers and to the King County South Wastewater Treatment Plant and thus
reduce the fees paid by the Port of Seattle for wastewater treatment. This project will help the
Port of Seattle meet the new King County Discharge permit restrictions and keep alignment
with our commitment to the All Known, Available and Reasonable methods of Treatment
(AKART) initiative. The size and scope of work for this project are an ideal fit for the Port
Construction Services (PCS) group. Requesting the design and construction authorization
simultaneously allows PCS to procure the TOC analyzers concurrent with the design and take
advantage of the dry season and preplan the construction in 2018.
DETAILS
Sea-Tac utilizes three primary lagoons for wastewater segregation.
Lagoon #1: A mix of high and low BOD water due to operational limitations resulting from a
lack of IWTP influent TOC meters. This project corrects this condition.
Lagoon #2: Provides storage for high BOD (dirty) water that must be discharged to King
County for treatment.
Lagoon #3: Provides storage for low BOD (clean) water that is permitted for discharge to the
Puget Sound.
Since the IWTP does not currently have influent TOC meters the BOD level of the incoming
wastewater is unknown and as such must be sent to Lagoon #1 for measurement, processing,
and storage. Existing TOC meters at the discharge outlets of lagoon #1 provide IWTP operators
with the information they need to determine the BOD content of the wastewater. This
operating scenario is inefficient because all incoming wastewater is mixed in lagoon #1 and
does not provide effective segregation of high and low BOD influent. High BOD wastewater is
often diluted and low BOD wastewater can be contaminated.
This project will reduce the volume of wastewater sent to Valley View Sewer District sanitary
sewers and to the King County South Wastewater Treatment Plant by segregating the
wastewater prior to storage in Lagoon No. 1 and thus reduce the fees paid by the Port of
Seattle for wastewater treatment and improve the operation of the IWTP.
TOC analyzers measure the Total Organic Carbon of wastewater and that data is corrolated to
Biochemical Oxygen Demand (BOD) of wastewater water. Per the Port of Seattle National
Pollution Discharge Ellimination System (NPDES) permit, wastewater with a High BOD must be
discharged to a Wasterwater Treatment Facility. Wastewater with a Low BOD can be
discharged directly to Puget Sound. Installing these two new TOC analyzers will not reduce the
COMMISSION AGENDA – Action Item No. 4g____ Page 3 of 5
Meeting Date: June 27, 2017
Template revised September 22, 2016; format updates October 19, 2016.
volume of wastewater to 36 million gallons per year, but these TOC analyzers will ensure that
only high BOD wastewater is discharged to Valley View Sewer District sanitary sewers and to
the King County South Wastewater Treatment Plant.
Scope of Work
Develop a design, procure equipment, construct and install two TOC analyzers in locations that
enable the IWTP operators to segregate the low and high BOD wastewaters and more
efficiently and effectively operate the IWTP.
Small Business
In support of the scope of work, portions of this project will utilize PCS small works contracts
which enable small business participation.
Schedule
Commission design and construction
authorization
Design start
Construction start
In-use date
Cost Breakdown
This Request
Total Project
Design
$407,000
$407,000
Construction
$735,000
$735,000
Total
$1,142,000
$1,142,000
ALTERNATIVES AND IMPLICATIONS CONSIDERED
Alternative 1 – Maintain current conditions
Cost Implications: $0
Pros:
(1) No capital costs required
Cons:
(1) The IWTP will continue to mix low and high BOD wastewater and discharge that
wastewater to a treatment facility at an average cost of $1,250,000 per year.
(2) Does not prepare the Port of Seattle for the new King County Discharge permit
restrictions and does not keep alignment with the All Known Available Reasonable
methods of Treatment (AKART) initiative.
This is not the recommended alternative.
COMMISSION AGENDA – Action Item No. 4g____ Page 4 of 5
Meeting Date: June 27, 2017
Template revised September 22, 2016; format updates October 19, 2016.
Alternative 2 – Install two new TOC analyzers
Cost Implications: $1,142,000
Pros:
(1) The SEATAC IWTP will be able to segregate Low and High BOD wastewater and
discharge only the wastewater that requires treatment to Valley View Sewer District
sanitary sewers and to the King County South Wastewater Treatment Plant and thus
reduce the fees paid by the Port of Seattle for wastewater treatment. We
conservatively estimate a 10% reduction in fees.
(2) Installing these new TOC analyzers will ensure that the Port of Seattle remains in
compliance with the National Pollution Discharge Ellimination System (NPDES) permit.
(3) The project will help the Port of Seattle meet the new King County Discharge permit
restrictions and keep alignment with the All Known Available Reasonable methods of
Treatment (AKART) initiative.
Cons:
(1) Requires a capital investment of $1,142,000
This is the recommended alternative.
FINANCIAL IMPLICATIONS
Cost Estimate/Authorization Summary
Capital
Expense
Total
COST ESTIMATE
Original estimate
$900,000
$0
$900,000
Revised estimate
$1,142,000
$0
$1,142,000
AUTHORIZATION
Previous authorizations
$50,000
$0
$50,000
Current request for authorization
$1,092,000
$0
$1,092,000
Total authorizations, including this request
$1,142,000
$0
$1,142,000
Remaining amount to be authorized
$0
$0
$0
Annual Budget Status and Source of Funds
This project CIP #C800655 was included in the 2017 capital budget and plan of finance with a
budget of $850,000. The budget increase will be transferred from the Aeronautical Allowance
CIP (C800753), resulting in no net change to the airport capital budget. The funding source will
be the Airport Development Fund.
COMMISSION AGENDA – Action Item No. 4g____ Page 5 of 5
Meeting Date: June 27, 2017
Template revised September 22, 2016; format updates October 19, 2016.
Financial Analysis and Summary
Project cost for analysis
$1,142,000
Business Unit (BU)
Utilities, Industrial Waste Water cost recovery
Effect on business performance
(NOI after depreciation)
NOI after depreciation will increase
IRR/NPV (if relevant)
N/A
CPE Impact
$.03 in 2019
Future Revenues and Expenses (Total cost of ownership)
Long term operating costs will be minimized by incorporating newer more energy-efficient
equipment and components that meet the Port’s mechanical and electrical design standards for
operational cost and optimum energy utilization. Maintainability will be improved by
installation of equipment with useful life spans of 20-30 years.
ATTACHMENTS TO THIS REQUEST
(1) Diagram of proposed of TOC analyzer layout and sample station locations.
(2) IWTP Lagoon overview.
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS
None