PORT OF SEATTLE
MEMORANDUM
COMMISSION AGENDA
Item No.
6b
Date of Meeting
April 28, 2009
DATE: April 9, 2009
TO: Tay Yoshitani, Chief Executive Officer
FROM: Richard Ottele, General Manager, Aviation Facilities and Infrastructure
Bob Riley, Director, Airport Capital Improvement Program
SUBJECT: Industrial Wastewater System (IWS) Hydraulics Improvements Project at Seattle-
Tacoma International Airport.
ACTION REQUESTED
Request for authorization for the Chief Executive Officer to advertise for construction bids and
to award contracts and employ Port crews and construct the IWS Hydraulics Improvements
Project at Seattle-Tacoma International Airport (Airport) for a total project cost of $1,185,000.
SYNOPSIS
This memorandum requests authorization to use Port crews and small works construction
contracts to complete the IWS Hydraulics Improvement Project. This work is the final
modification in completing the IWS Improvement program. The IWS upgrades began in the
1990’s under the National Pollution Discharge Elimination System (NPDES) permit. This
project will prevent high biological oxygen demand (BOD) stormwater from leaking from IWS
lagoons 1 and 2 into low BOD IWS lagoon 3. This leakage contaminates the water stored in
lagoon 3 resulting in increased treatment and discharge costs. No additional budget is being
requested as the budget for the project has been previously authorized.
BACKGROUND
The IWS system collects stormwater runoff from 375 acres of impervious surface where planes
are fueled and de-iced. The water is separated according to its BOD level, with high BOD water
stored in lagoons 1 and 2 and low BOD water stored lagoon 3. All of the water is treated in the
Airport’s Industrial Wastewater Treatment Plant (IWTP). The IWTP removes suspended solids
and oil. After treatment, high BOD effluent is sent to the King County South Treatment Plant
for secondary treatment, while low BOD effluent is discharged to Puget Sound in accordance
with the Airport’s NPDES permit. Treatment through the South plant is significantly more
expensive, so it is important to keep the high and low BOD water separated.
COMMISSION AGENDA
T. Yoshitani, Chief Executive Officer
April 9, 2009
Page 2 of 5
PROJECT DESCRIPTION/SCOPE OF WORK
Project Statement:
Make improvements to the hydraulic piping and controls for the IWS system by the fall of 2009
for an estimated cost of $1,185,000.
Project Objectives:
Improve the capability to control IWS stormwater flows between the IWS lagoons.
Reduce IWS stormwater treatment costs.
Maintain compliance with the Airport’s NPDES permit requirements.
Scope of Work:
The hydraulic improvements at the IWTP plant will:
Relocate an electrical power and control ductbank.
Construct a new 24-foot deep vault at manhole 491-A.
Install a 48-inch valve, piping, controls, and actuator.
Connect the new valve into the existing IWTP control system.
The work is planned to be accomplished through a combination of Port Construction Services
(PCS) self-performed work employing Port crews, plus small works construction contracts for
the specialized trades that PCS does not do. The contracted work will be less than $200,000.
Port will also lease equipment to perform the work.
STRATEGIC OBJECTIVES
This project supports the Port strategy to “Exhibit Environmental Stewardship Through our
Actions”. The hydraulic improvements will prevent unintentional contamination and provide
control so that the IWTP can be operated in the most efficient and cost effective manner, while
treating water in compliance with the NPDES permit.
ALTERNATIVES CONSIDERED/RECOMMENDED ACTION
Alternative 1: Do nothing. Treatment and discharge costs cannot be optimized due to high BOD
leakage into the low BOD storage lagoon. There also is a possibility fines could be assessed, if
the Airport does not meet discharge regulations.
Alternative 2: Proceed with the project to correct the hydraulic leakage. This is the
recommended alternative.
COMMISSION AGENDA
T. Yoshitani, Chief Executive Officer
April 9, 2009
Page 3 of 5
FINANCIAL IMPLICATIONS
The costs of this project are included in the current budget and have been previously authorized.
This project will complete the IWS Improvements program.
Budget/Authorization Summary
Previous IWS
Work
CIP C100451
Original budget
$31,000,000
$14,700,000
Budget transfers
$484,899
($379,815)
Revised budget
$31,839,696
$14,320,185
Budget savings
($354,797)
($2,308,000)
Current budget
$31,484,899
$12,012,185
Previous authorizations this CIP
$31,850,000
$21,782,000
Authorizations for budget transfers
($10,304)
($7,461,815)
Current request for authorization
$0
$0
Total authorizations, including this request
$31,839,696
$14,320,185
Remaining budget to be authorized
$0
$0
Project Cost Breakdown
Total Project
Construction costs
$698,000
Purchase long-lead material
$75,000
Sales tax
$75,000
Outside services
$201,000
Other
$136,000
Total
$1,185,000
Source of Funds
This project is included in the 2009-2013 capital budget and plan of finance as a committed
project under CIP C100451. The funding source will be existing bond proceeds.
COMMISSION AGENDA
T. Yoshitani, Chief Executive Officer
April 9, 2009
Page 4 of 5
ECONOMIC IMPACTS
This project will minimize stormwater treatment costs by preventing uncontrolled contamination
of high BOD water from IWS lagoons 1 and 2 into IWS lagoon 3. Specific savings are variable
and difficult to calculate because they depend on many factors including the size, duration and
timing of large rain events and the fill status of the three IWS lagoons when rain and deicing
events occur.
ENVIRONMENTAL SUSTAINABILITY/COMMUNITY BENEFITS
This project will increase the effectiveness of operation of the IWS system in meeting
environmental permit requirements that benefit both the surrounding communities and Puget
Sound.
TRIPLE BOTTOM LINE SUMMARY
This project will decrease long term operating costs for the airport, reduce volumes of effluent
that must be treated offsite, and help ensure that only clean water enters Puget Sound.
PROJECT SCHEDULE
Start construction July 2009
System in operation October 2009
Project completion June 2010
Every effort will be made to complete the construction by October 1, 2009, before the onset of
the rainy season. If the new pipe and valve cannot be operational by that date, the site will be
restored to a stable condition and construction will be suspended until the following spring.
PREVIOUS COMMISSION ACTION
Pre-Phase 1 Capital Improvement Program Authorizations
On January 26, 1994, the Commission authorized $407,500 to prepare preliminary tenant and
Port pollution prevention plans, conduct chemical and biological water quality sampling, verify
existing drainage systems, pay for the NPDES permit for the Airport’s Industrial Wastewater
Treatment Plant, and conduct stormwater system maintenance to meet new NPDES
requirements.
On April 26, 1994, the Commission authorized $515,000 for a comprehensive IWS plan, which
was incorporated into the Engineering Report, required by the draft NPDES permit submitted to
the Washington Department of Ecology (WDOE) in December 1995.
COMMISSION AGENDA
T. Yoshitani, Chief Executive Officer
April 9, 2009
Page 5 of 5
On October 24, 1995, the Commission authorized $3,628,000 for the NPDES permit process for
the IWS including sampling and testing, engineering support, coordination with WDOE, design
and construction of interim improvements and thirty percent design of Lagoons No. 1 and No. 2
improvements and other miscellaneous improvements.
On June 10, 1997, the Commission authorized $350,000 to create snowmelt runoff facilities to
comply with the requirements of the NPDES permit.
On July 9, 1999, the Commission authorized $8,372,000 for sampling and testing, engineering
support, coordination with WDOE, design and construction of Lagoon No. 1 and No. 2
improvements, and other miscellaneous improvements, and thirty percent design of Lagoon No.
3 expansion.
Phase 1 Capital Improvement Program Authorizations
August 24, 1999, the Commission authorized $19,000,000 for the expansion of Lagoon No. 3 to
seventy two (72) million gallons and IWS piping within South 154
th
Street.
On July 9, 2002, the Commission authorized $500,000 for Industrial Wastewater System
Upgrade Phase IVA on a project-wide basis, for a total estimated cost of $19,391,000.
Phase 2 Capital Improvement Program Authorizations
On September 12, 2000, the Commission authorized $600,000 for preliminary design work on a
project-wide basis to optimize the ability to meet the requirements of the proposed Engineering
Report and the current NPDES permit.
On September 25, 2001, the Commission authorized $509,000 for construction of the section of
the AKART pipeline within International Boulevard (State Route 99). This was a portion of the
authorization request for utility improvements within International Boulevard.
On March 26, 2002, the Commission authorized $1,500,000 for the design work to meet the
AKART requirements for the IWS. The design includes piping, a pump station, treatment plant
improvements to segregate flows and a connection to the King County Renton Treatment Plant
for treatment of the high BOD IWS flow after pre-treatment at the Airport’s Industrial
Wastewater Treatment Plant and other miscellaneous improvements.
On November 11, 2003, the Commission authorized $19,173,000 for the Industrial Wastewater
System Upgrade Project.
