Item No.:                    7a_supp 
Meeting Date:             June 3, 2014 
Stormwater Overview Briefing 


1

Presentation Overview 
1. Century Agenda Goal 
To meet or exceed agency requirements for
stormwater leaving Port-owned or operated
facilities 
2. Permits 
Successes and challenges 
3. Stormwater Fees 
$4 Million/year to City of Seattle. 
2

Glossary 
AKART 
All Known, Available and Reasonable methods of prevention,
control, and Treatment 
BMP 
Best Management Practices 
ISGP 
Industrial Stormwater General Permit 
NPDES 
National Pollutant Discharge Elimination System 
SWM 
Storm Water Management 

3

Airport Individual NPDES Permit 


Stormwater Drainage System     Industrial Wastewater System     Construction Activities 
Metal treatment and flow control      Aircraft Deicing and Maintenance       Small to major capital works 
Miller and Des Moines Creek         Puget Sound discharge             Turbidity and oils & grease
control 
4

Industrial Wastewater Treatment 
100 to 300 M gallons/year 
> 95% BOD Reduction 
$60 million upgrades 



5

Stormwater Management 
100% surfaces          Expressways 
detained and treated    160
120
$78,000,000         80          Before
ug/L
40              After
0
T-Zinc  T-Copper
Runways 
30
ug/L
20
10               Before
After
0
T-Zinc T-Copper
6

Permit Coverage 
Phase I Municipal Stormwater Permit 
ISGP Permits 
18 Tenant Permits 
2 Port Permits 
Covering 700 Acres 
Other SEA/RE NPESP Permits 
Individual, Boatyard, Construction 

All NPDES Permits 
100% of Permit Coverage at RE/SEA 
1%
Other 
65%
ISGP 
34% 
Municipal 

7


Port of Seattle ISGP 
1 Acre Treatment Site   Oyster Shells 



Vacuum Scrubber

Splash Boxx at T91 



9

ISGP Thresholds 
WA State ISGPs contain the most stringent
requirements in the country for Zinc & Copper. 
Corrective Action Threshold Limits 
Zinc                            Copper 
micrograms per liter 
micrograms per liter 
260                                         33.2 

20 
117                   120                     14 


Washington   California    Oregon              Washington   California    Oregon

10

ISGP Cycle Time 
WA State Standards: most stringent in the country AND fastest to comply. 
If baseline requirements are exceeded in Washington State, action must be taken
within 1 Quarter. 





Level 1: Operational               Level 2: Structural                 Level 3: Treatment 
If baseline exceeded               e.g. Sweeping              e.g. Covering storage areas            e.g. Chitosan or Up-flo 
$ $$ $$$ 

11

ISGP  Tenants 
T-46: Port installing Up-flo on 3 of 4 outfalls / ~80 acres 
Appling structural and operational BMPS throughout the site. 
T-18: Due to high number of outfalls (20) / ~200 acres: 
Installing Modular Wetland System and roof down spout
treatment at source locations 
Appling structural and operational BMPS throughout the site 
T-5: Unknown treatments needed ~160 acres 
14 Outfalls 
T-115: Installing a Chitosan treatment system on 2 of 5 outfalls / ~70
acres 
Appling structural and operational BMPs throughout the site. 
Also Treatment needed at: 
T104, T106, T108, T25 & T30 

12

Joint AKART Study 
A roadmap for: 
Partners 
Predictable ISGP compliance 
reasonable required stormwater 
treatment actions.
Tied to larger permit update 
Issued on May 7th with New ISGP
for public comment. 

13

City Stormwater Fees 
SWM Fees: 1997 - 2018 
$5.0
$4.57 
1997-2013 SWM Fees:                        $4.39 
$4.5
$4.22 
$4.06 
$4.0             $24 Million                                   $3.69 

$3.5        Next Five Years for SWM Fees:                          $3.36 
$3.05 
$3.0            $ 21 Million                     $2.71 
In Millions   $2.5                                                      $2.26 $2.31 
$2.04 
$2.0
$1.40 
$1.5                                         $1.30 
$1.05 
$1.0                                 $.83 
$.69   $.69   $.73 
$.51   $.51 
$.40   $.42 
$0.5

$0.0
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
Tenants           Port of Seattle 
14

Port has the same obligations and
authority as the City. 
Obligations: 
Both the City and Port have a Phase 1 municipal
permits that governs our Stormwater programs. 
Authority 
RCW 53.08.043 expressly grants port districts "all of the
powers relating to systems of sewerage authorized by
RCW 35.67.010 and 35.67.020 [utility statutes for
Cities]." 

15

Spigot 
Stormwater costs 

Stormwater
infrastructure
ISGP        Municipal 
repair &
costs         Program 
upgrades 
$50M 
to         $10M       $25M 
100M 
16

Total Stormwater requirements 
Next 5 years 
$85 to $135 Million 
in SW Requirements 
Plus 
$21 million could be
used repair and
$21 Million in SWM fees  replaced 16 miles 
of Port owned
stormwater pipes. 


17

Next Steps 
Discuss Stormwater Fees with City of Seattle 
Return to Commission in late summer with options 
Continue implementation of our Phase I
municipal permit 
Work with WPPA and others on the next ISGP
(out for public comment now) and the AKART 
Continue to look for innovative and cost
effective solutions, like the Splash Boxx 

18