8b Terminal 18 Stormwater presentation

Date: February 13, 2018
Item No.: 8b 
Terminal 18 Stormwater Outfall
Renewal and Replacement 
Marine Stormwater Utility

Highlights 
Marine Stormwater Utility formed in 2014 to protect water quality of the Puget
Sound 
Won AAPA Comprehensive Environmental Management Award 
Tenant fees about 15% lower compared to City's Utility fees 
System assessment & rehabilitation 
Obtain baseline conditions of entire system, due to be completed end of 2019 
A dozen urgent repairs completed preventing safety & operational hazard 
Investments in the stormwater system 
Green Stormwater Infrastructure such as oyster shell barrels & rain garden 
Installation of tide gates 
Tenants expressed positive feedback on our efforts 

Highlights of work accomplished 
2

Utility Revenue & Goals 
Utility Revenue Breakdown           Assess all 78 miles of
NWSA
infrastructure by 2019 
NWSA tenants
Invest in asset
Port
rehabilitation to
Port tenants
improve water quality 
Collected $4.96 million in
2017, $5.33 million in 2018 
Provide triple bottom line benefits 
3

Terminal 18 Stormwater 
Drainage area roughly 175 acres
(nearly 9 Safeco Fields) 
Most site drainage enters Duwamish
East Waterway through 13 Port-
owned outfalls 
Outfalls were installed ~50 years ago 

Largest active container terminal 
4

T-18 Stormwater System 


East Waterway Outfall Locations 
5

Existing Outfall Conditions 

Ponded water in the pipes 

Broken Pipes                                                                           Missing tide gates 
Visible conditions under the dock 
6

Current Assessment / Scope of Work 
Focus from last manhole to end of pipe 
Repair broken and cracked pipe 
Realign pipe grade or slope 
Install new tide gate valves 

New tide gate installation 
Current Conditions and Repair 
7

Project Schedule 
Commission Authorizations 
Design & partial construction authorization - Q2 2017 
Full Construction authorization - Q1 2018 
Construction Activities 
Non-disruptive activities postponed until 2018 
Repair and replacement construction phased between
2018 and 2020 
Schedule phased over 4 years 
8

Limitations of Translatable Documents

PDF files are created with text and images are placed at an exact position on a page of a fixed size.
Web pages are fluid in nature, and the exact positioning of PDF text creates presentation problems.
PDFs that are full page graphics, or scanned pages are generally unable to be made accessible, In these cases, viewing whatever plain text could be extracted is the only alternative.