Calendar of Events

Upcoming events

    • 26 Sep 2017
    • 5:30 PM - 8:00 PM (PDT)
    • Pyramid Brewery 1201 First Avenue South Seattle, WA  98134
    • 49
    The American Water Resources Association Washington Section

     invites you to

    Ten Years of Clean Water:  The Effects of Stormwater Source Controls
    on Sediment Quality in Thea Foss Waterway, Tacoma, Washington

     presented by

    Dana de Leon, professional engineer at the City of Tacoma,
    Environmental Services/ Science & Engineering Division
    Mary Henley, senior engineer at the City of Tacoma, Environmental
    Services/ Science & Engineering Division


     Tuesday, September 26, 2017


    Pyramid Brewery
    1201 First Avenue South
    Seattle, WA  98134

     Social and Networking - 5:30 PM to 6:30 PM
    Dinner - 6:30 PM to 7:00 PM
    Presentation - 7:00 PM to 8:00 PM


    Under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), also referred to as Superfund, contaminated bottom sediments were remediated in the Thea Foss and Wheeler-Osgood Waterways in Tacoma, Washington under the oversight of the Environmental Protection Agency (EPA) at a cost of $105M.  Sources of Contaminants of Concern (COCs) continue to exist in the drainage basins and are conveyed to the waterways via stormwater (municipal and private), aerial deposition, marinas, and groundwater discharges. 

    Since stormwater is one of the potential sources, the City of Tacoma is implementing a stormwater source control program (started in 2001) to protect the quality of waterway sediments and the integrity of the cleanup.  The program is supported by post-construction sediment quality monitoring; stormwater, base flow, and storm sediment monitoring; and a validated contaminant transport model of the waterway (EPA WASP model).  Contaminants of concern in waterway sediments include polycyclic aromatic hydrocarbons (PAHs) and bis(2-ethylhexyl)phthalate (DEHP).  These contaminants are associated with various ongoing sources including municipal stormwater, marinas, atmospheric deposition, and groundwater discharges, many of which are common or ubiquitous in modern urban environments.  The WASP model predictions in Thea Foss Waterway show excellent agreement with seven years of observed post-construction sediment quality data, validating the ability of the model to link pollutant loads to sediment concentrations, and predict the effects of source control actions on waterway sediment quality. 

    The City’s multi-pronged stormwater source control program consists of best management practices, business inspections, public education, source tracing investigations, and stormwater treatment.  Over the 15 year period (August 2001-September 2016), these efforts have resulted in statistically significant reductions in suspended sediments, lead, zinc, PAHs, and DEHP, in spite of the inherently high variability of stormwater data.  In recent years, the City performed basin-wide street sweeping and system-wide storm sewer cleaning in selected drainages to remove residual contaminated sediments that may continue to degrade stormwater quality. Street Sweeping and system-wide sewer cleaning resulted in statistically significant reductions in PAHs and metals.  Finally, the City developed a GIS-based pollutant loading model of its urban drainages (HSPF model) to evaluate the cost-effectiveness of various treatment technologies and management practices for reducing pollutant loads in stormwater; including in-line treatment vaults, street sweeping, and low-impact development (LID).  The model results identify areas and land uses that contribute disproportionately to stormwater pollution, where source control efforts are best focused, and recommendations for cost-effective source control investments.

    About the speaker

    Dana de Leon is a professional engineer at the City of Tacoma, Environmental Services/ Science & Engineering Division.  She is a chemical engineer with 28 years of experience in stormwater studies related to quality/quantity, source evaluations, NPDES regulatory issues, stormwater treatment technologies and Superfund evaluation and cleanup. Recent experience includes: 

    o Developing regional stormwater treatment program and capital improvement projects with a focus on selecting sites for and tracking publically-owned stormwater treatment facilities.

    o Project engineer of the Thea Foss Waterway Source Control Strategy Program.


    Mary Henley is a senior engineer at the City of Tacoma, Environmental Services/ Science & Engineering Division.  She is a civil engineer with 31 years of experience, primarily working on environmental cleanup projects and regulatory compliance.  She is the project manager of the Thea Foss Waterway Superfund cleanup project and works closely with the associated stormwater source control program.


    $30 for current members

    $35 for guests

    Free for students (Reserved for student members enrolled full-time, as outlined on the  AWRA-WA website,

    If you are planning to pay in person at the event, please note that we can only accept payment then in the form of cash or a check.  If you want to pay using PayPal or a credit card, please do so online before the event.

    Registration as a guest is available if you are not a member of AWRA-WA.

    Cancellation Policy: AWRA-WA will fully refund the registration fee if cancellation notice is received at least 5 days before the event.

    • 03 Oct 2017
    • 8:00 AM - 7:00 PM
    • Mountaineers Seattle Program Center, 7700 Sand Point Way NE, Seattle WA

    2017 AWRA Washington State Conference

    The 100 Year Anniversary of the Washington Water Code: Where We Came From and Where We’re Going

    October 3, 2017

    8:00 AM to 5:00 PM

    (Reception 5:00 to 7:00 PM)

    Mountaineers Seattle Program Center

    7700 Sand Point Way NE, Seattle, WA


    The AWRA-WA welcomes you to join us for an interdisciplinary investigation of Washington water from adjudication to technical analysis.  This year’s conference includes an intriguing reflection of the past 100 years of the Washington Water Code, its implementation, and a look forward to the next 100 years.  Stresses from population growth and increasing uncertainty from climate change will test the state’s ability to manage an over allocated resource.  How will we adapt? Do we have the technical and policy tools to meet the challenges ahead?

    AWRA-WA is proud to announce keynote speaker Charles Wilkinson – Distinguished Professor, Moses Lasky Professor of Law at the University of Colorado School of Law.  For his full bio, please click the image below.

    Professor Wilkinson will present:  Western Water Law and Policy in the Modern Era: Has Washington Made the Needed Changes?


    Our conference program includes the following five sessions:

    Session 1: Early Water Code History – Reflecting on the historic cultural significance of water from time-immemorial through early statehood, including the early history of water right appropriation, establishment and development of the surface water code from 1917 through the Water Resources Act of 1971.  This is the era of water appropriation.

    Moderator: Andy Dunn, RH2

    Pre-Water Code History- Tom Ring, Yakama Nation

    Water Code History- Tom McDonald, Cascadia Law Group


    Session 2: Contemporary Water Code History – Marking the change from water right appropriation to recognition of competing needs, including protecting the quality of the environment and the natural interrelationships of surface and ground waters, this session will reflect on establishment of the instream flows, management of water resources, and quantification through adjudications and market-based reallocation.

    Moderator: Dave Christensen, Department of Ecology

    Water Management and Instream Flow- Ken Slattery, retired from Department of Ecology

    Protecting Instream Flow- Hal Beecher, retired from Department of Fish and Wildlife

    Adjudication and Reallocation- Bob Barwin, retired from Department of Ecology

    Session 3: Defining Future Risks – The water code must be able to respond to changes in water availability, water demand, population, and climate.  This session will discuss some of the technical, legal, and social issues that will drive future water management and the need for collaboration and adaptability.

    Moderator: Steve Hirschey, King County

    Water Availability and Reliability: Legal Perspective- Peter Dykstra, Plauche & Carr LLP

    The Public Interest and the Future of Water Law- Rachael Paschal Osborn, Attorney at Law

    Future Out of Stream Supply and Demand- Jennifer Adam, Washington State University

    Session 4: Identifying Possible Solutions – Future solutions to challenges in water resources may be found in current actions that work with today’s code; this session will look at conflict resolution, legal water right certainty, and solutions through infrastructure, including storage and conveyance.

    Moderator: Tyson Carlson, Aspect Consulting

    Conflict Resolution- Lynette de Silva, Oregon State University

    Achieving Legal Certainty- Adell Amos, University of Oregon

    Storage – J. Ryan Brownlee, Aspect Consulting, LLC

    Methow Valley Irrigation District- Lisa Pelly, Trout Unlimited

    Session 5: Panel on Legislative Change and Funding Needs – Our conference concludes with a facilitated panel including representatives from agency, legislative, and stakeholder groups discussing what changes need to be made to water management and the water code, and how they will be supported and funded in a time of shrinking state and federal budgets.

    Moderator: Adam Gravley, Van Ness Feldman LLP

    Charles Wilkinson, University of Colorado

    Scott Revell, Roza Irrigation District

    Derek Stanford, Representative of 1st Legislative District

    Jaime Pinkham, Columbia River Intertribal Fish Commission

    Early-bird registration is open through September 15.  Please contact John Chandler with any questions.


    Registration Type

    Early-Bird (thru September 8, 2017)








    Student/Recent Graduate



Past events

27 Jun 2017 AWRA-WA June Seattle Dinner Meeting - 2017 Washington State Legislative Update
23 May 2017 AWRA-UW Spring Networking Event 2017
16 May 2017 AWRA-WA May Seattle Dinner Meeting - Using the SUSTAIN Model to Maximize Efficiencies in the Management of Stormwater
25 Apr 2017 AWRA-WA April Seattle Dinner Meeting - A NORTHWEST VISION FOR 2040 WATER INFRASTRUCTURE
19 Apr 2017 Washington Water Trust presents: Wild and Scenic Film Festival 2017
22 Feb 2017 February Dinner Meeting - Nooksack River System-Wide Improvement Framework
25 Jan 2017 UW-AWRA Student Mixer
13 Dec 2016 December 2016 AWRA-WA Members Meeting, New Board Members Announcement, and Social
06 Dec 2016 Northwest Environmental Conference & Trade Show
01 Dec 2016 6th Annual Winter CLE: Protecting Instream Values in the Face of Climate Change
10 Nov 2016 Ellensburg Dinner Presentation - Naneum/Whiskey/Cherry Watershed Assessment
26 Oct 2016 2016 AWRA Washington State Conference - Rural Domestic and Municipal Water Supply
28 Sep 2016 September Dinner Meeting - Managing the Baker Project's Driest Season
14 Jun 2016 2016 Washington State Legislative Update: Joint AWRA-WA & Washington Hydrologic Society Meeting
08 Jun 2016 Celebrate Water with CELP on June 8th!
17 May 2016 University of Washington AWRA Students and Professionals Speed Networking Event
12 May 2016 May Dinner Meeting - NGWREF Darcy Lecture 2016
20 Apr 2016 Wild and Scenic Film Festival - A Change of Course
29 Mar 2016 Dinner Presentation - Drinking Water and Climate Change
09 Mar 2016 Managing Stormwater in Washington
23 Feb 2016 Dinner Presentation - Update on Recent Court Cases: The New Rules on Water Availability as Defined by Washington Courts and Legislative Response
27 Jan 2016 AWRA-WA Student Mixer
08 Dec 2015 December Dinner Meeting, 2016 Board Election, and Movie “Lost Rivers”
08 Dec 2015 Northwest Environmental Conference & Trade Show
03 Dec 2015 Water Law and the Public Trust CLE - Living Within Our Water Means
03 Nov 2015 Dinner Presentation - What's Happening in Central Washington: An Overview of Ecology's Water Resources Program
22 Oct 2015 2015 AWRA Washington State Conference - Water Management Strategies in the Face of Climate Change
07 Oct 2015 Dinner Presentation - Planning for Climate Change in the Wenatchee River Basin: The Alpine Lakes Storage Optimization Project
16 Sep 2015 Dinner Presentation -Clean Samish Initiative Presented by Karen DuBose, Skagit County
14 Sep 2015 Proving Groundwater Contamination Claims (presented by Law Seminars International)
20 May 2015 Washington State Legislative Update: Joint AWRA-WA & Washington Hydrologic Society Meeting
30 Apr 2015 April 30 AWRA Dinner Meeting and CWU Student Chapter Mixer
23 Apr 2015 Wild and Scenic Film Festival - A Wild Life
16 Apr 2015 University of Washington AWRA Students and Professionals Speed Networking Event
09 Apr 2015 AWRA-WA Eastern Conference
01 Apr 2015 Dinner Presentation - King County Recycled Water: The Right Water for the Right Use
11 Mar 2015 Managing Stormwater in Washington
24 Feb 2015 Dinner Presentation - Department of Ecology Draft Rule for Human Health Criteria
30 Jan 2015 Extreme Westcoast: Geomorphology, hydrology, and ecology of the aftermath of extreme events
22 Jan 2015 AWRA UW Student Chapter and AWRA-WA Mixer
11 Dec 2014 AWRA-WA December Meeting
05 Dec 2014 Water Law & Public Trust - Continuing Legal Education
06 Nov 2014 Dinner Presentation -Washington State Trust Water Right Program Presented by Kelsey Collins
23 Oct 2014 2014 AWRA-WA Annual State Conference - Water Resources Infrastructure: Emerging Frameworks to Meet Multiple Objectives
10 Sep 2014 Dinner Presentation -Puget Sound Energy’s Baker River Project Presented by John Chandler, Puget Sound Energy
09 Sep 2014 Pacific Northwest Climate Science Conference
03 Jun 2014 University of Washington AWRA Students & Professionals Networking Event
20 May 2014 Washington State Legislative Update: Joint AWRA-WA & Washington Hydrologic Society Meeting
05 May 2014 AWRA-WA Board Meeting
01 May 2014 Spokane Event - Water Resource Perceptions & Watershed Modeling - Presentation by Melanie Thornton and Kate Tillotson, PhD students at WSU
01 May 2014 Dinner Presentation -Seattle’s Cascade Watersheds Supply System Presented by Brent Lackey, Major Watersheds Strategic Advisor, Seattle Public Utilities
07 Apr 2014 AWRA-WA Board Meeting
27 Mar 2014 Dinner Presentation - King County’s “In-Lieu Fee” Mitigation Program - Presentation by Michael Murphy, Land Conservation Program Manager, King County
27 Feb 2014 Dinner Presentation and Movie Screening – Return of the River
30 Jan 2014 University of Washington Student-AWRA Mixer
11 Dec 2013 December 11, 2013 Dinner Meeting, including 2014 Board of Director elections and extended year-end social hour
19 Nov 2013 Wild and Scenic River Campaigns of the North Cascades
14 Nov 2013 Green meets Blue: Growth Management and Water
24 Oct 2013 An overview of Spokane regional water resource management activities
15 Oct 2013 Updating the Washington Irrigation Guide (WIG)
26 Sep 2013 2013 AWRA Washington State Conference - Future Directions in Water Resource Management
13 Sep 2013 Hot Environmental Issues for the Puget Sound Region
18 Jun 2013 Ecology Water Resource Data System Redevelopment
15 May 2013 Low Impact Design for City of Spokane Future Storm Runoff and CSO Management
08 May 2013 2nd Annual Joint WA-AWRA & Washington Hydrologic Society Meeting
23 Apr 2013 2013 Washington Hydrogeology Symposium
11 Apr 2013 WA-AWRA Student Speed Networking
28 Mar 2013 Puget Sound Past, Present, and Future: A Century and a Half of Hydrologic Change
07 Mar 2013 The Business of Stormwater Regulation and Compliance
26 Feb 2013 Global Sanitation and Water Supply: Linking Aid, Technology and Lessons Learned to Deliver Sustainable Solutions that Work in International Communities and in the United States
06 Feb 2013 Permitting of Shoreline and In-Water Projects
29 Jan 2013 WA-AWRA Student-State Mixer
06 Dec 2012 Continuing Legal Education Seminar: Washington Water Law and the Public Trust
04 Dec 2012 Natural Stormwater Management and Salmon Habitat Restoration and Re-forestation for King County’s Brightwater System
25 Oct 2012 Lacey-Olympia-Yelm Water Rights - An Example for the Future Procurement of Municipal Water Supplies
11 Sep 2012 2012 AWRA Washington State Conference
06 Jun 2012 Green Remediation - Understanding & Reducing a Project's Environmental Footprint
05 Jun 2012 Viruses in Salmon - Intriguing Tricksters
04 Jun 2012 AWRA-WA Monthly Board Meeting
21 May 2012 Western Snow Conference (Non AWRA Event)
09 May 2012 Legislative Update
07 May 2012 AWRA-WA Monthly Board Meeting
24 Apr 2012 Flow Restoration, Mitigation and Water Markets
18 Apr 2012 2012 University of Washington Water Symposium
02 Apr 2012 AWRA-WA Monthly Board Meeting
27 Mar 2012 Elliott Bay Seawall Project
05 Mar 2012 AWRA-WA Monthly Board Meeting
21 Feb 2012 Opportunity and Crisis - the Renegotiation of the Columbia River Treaty
06 Feb 2012 AWRA-WA Monthly Board Meeting
24 Jan 2012 University of Washington Student Mixer


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