Item No. 8l_supp
Meeting Date: December 14, 2021
Industrial Wastewater Treatment Program
Preliminary Design Funding

Location

IWTP

N
2

Location
Lagoon 2

Lagoon 1
IWTP



Lagoon 3
N
3

Industrial Wastewater Treatment Plant (IWTP)
OverviewS 146th St
Runoff with low Biochemical Oxygen Demand       Ave S
(BOD) discharges to the Puget Sound  th 24
Runoff with high BOD discharges to King
County Sewer District for secondary treatment
The Port has diverted 11.6 million pounds of
BOD from the Puget Sound since 2007


4

King County Permit Changes
S 146th StHigh BOD discharges have resulted in
operational impacts to King County South
Treatment Plant                      th 24 Ave S
King County BOD limits will be reduced to
25% of the current permit levels on the
next permit cycle (2026)
New permit limits will require pretreatment
onsite at STIA before discharge
to King Country Sewer District

5

Project Overview
Purpose:
Install a pre-treatment system and upgrade the existing systems at the Industrial
Wastewater Treatment Plant (IWTP) to reduce high-BOD effluent.
Scope:
Install pre-treatment system
Install effluent discharge systems
Install new pumps and systems to support stormwater reuse
Establish storage system to facilitate pre-treatment
Install support infrastructure (new building, controls, HVAC, lagoon mixing, etc.)

6

Additional Project Information
Current Approach
S 146th StPlanning funds will be used to develop:
Detailed Basis of Design (treatment configuration, storage options, infrastructure needs)
th Ave S
Project Notebook                   24
Updated cost estimate
Evaluation of siting and permitting requirements
Coordination with FAA, WA Department of Ecology, King County will be required
King County  Planning Phase Milestones
Draft Engineering Report  due August 31, 2022
Final Engineering Report  due December 31, 2022
7

Project Budget & Schedule
CIP: C801234                               Preliminary Schedule Milestones:
Budget: $100,000,000 - $200,000,000            Preliminary Design Start: Q1 2022
Previous Authorization: $135,000               Design Start: Q2 2023
Current Request: $2,000,000                    Construction Start: Q1 2025
In-Use Date*: Q4 2026 - Q2 2027



8

Cone of Certainty

We are here





9

Action Requested
1) Advertise and execute a contract for Architecture and Engineering (A&E) services for the IWTP
Program (CIP C801234).
The amount of this request is $2,000,000 for a total estimated project cost of $100M-$200M.





10

Thank
You!

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Port of Seattle

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