November Meeting Announcement

DATE:    Wednesday, November 30th
PLACE:  Hawthorne Lucky Lab Brew Pub, 915 SE Hawthorne Blvd
TIME:     11:30 a.m: Networking, 12:00 – 1:00 p.m: Presentation
SPEAKER:  Kevin Vigil, Mauria Pappagallo and Nate Robinson, ESA
TOPIC: Water Resources Engineering for Portland’s Tilikum Crossing


Tilikum Crossing, Portland’s first new bridge over the Willamette River since 1973, is part of TriMet’s 7.3-mile Portland-Milwaukie Lightrail transit project that connects downtown Portland with the City of Milwaukie.  This 1,720-foot long cable-stayed transit bridgetilikum includes two pylon-supported pier towers within the active channel of the Willamette River.

This presentation will focus on the unique water resources engineering aspects of this large transit bridge project.  Design challenges included providing fish passage around bridge piers for endangered salmonids, understanding and managing hydraulic scour and channel bed erosion, and providing stormwater management for runoff from the bridge deck.

Tilikum Crossing (Bridge of the People) is the largest car-free bridge in the United States. As the latest addition to Portland’s bridge-scape, Tilikum Crossing carries the Portland Streetcar, the MAX Orange Line, TriMet buses, and cyclists and pedestrians over the Willamette River.


Ken Vigil, PE, is a senior civil and environmental engineer and one of the founders of Vigil-Agrimis.  He has worked on water resources projects in the Pacific Northwest and the Great Lakes region for almost 35 years, including projects for fish passage, bridge hydraulics, stream restoration, water quality, and stormwater management.
Mauria Pappagallo, PE, is a water resources engineer with over a decade of professional experience in fluvial geomorphology, bridge hydraulics, hydraulic modeling, scour countermeasure design, and riparian and floodplain restoration design.   She has reviewed scour issues and designed scour countermeasures at bridge and culvert sites throughout Oregon and Washington.

Nate Robinson, PE, is a Civil and Water Resources Engineer with 7 years of experience in stormwater design, hydraulic and hydrologic analysis, utility design, and site design. He has worked extensively on innovative stormwater projects within the City of Portland and throughout Oregon.

October Meeting Annoucement

DATE:    Wednesday, October 26th
PLACE:  Hawthorne Lucky Lab Brew Pub, 915 SE Hawthorne Blvd
TIME:     11:30 a.m: Networking, 12:00 – 1:00 p.m: Presentation
SPEAKER:  Marlys Mock and Todd Perimon, TVWD
TOPIC: Regional Willamette Water Supply Program

tvwdThe regional Willamette Water Supply System (WWSS) will provide additional resiliency and redundancy to the water supplies of the City of Hillsboro and the Tualatin Valley Water District in Washington County and other potential project partners. The WWSS will include a 60 MGD water treatment plant, 30 million gallons of terminal reservoir storage, and more than 30 miles of 66-in to 48-in diameter pipeline. This presentation will provide an overview of the WWSS, detail the efforts of the Program Team and agency partners to identify and gain endorsement of an approved pipeline route, and discuss how the team coordinates with the numerous stakeholders on this $1.2 billion regional water supply program.


Marlys Mock has worked in public involvement and communications in the Pacific Northwest since 1998 as both a consultant and public official.  Prior to joining the Willamette Water Supply Program (WWSP) Marlys was the facilities liaison for Portland Public Schools. In her current role as the Communication and Outreach Coordinator for the WWSP, Marlys oversees the communication and outreach efforts to 8 cities, two counties and the numerous stakeholder groups in the region.

Todd Perimon is a registered Civil Engineer with over 25 years of experience in planning, design and construction of large water infrastructure projects.  He has been involved in numerous seismic resiliency projects including serving on the Water and Wastewater Committee that developed the Oregon Resilience Plan.  Todd currently serves as the Program Delivery and Real Estate manager for the WWSP.

2017 Stormwater Symposium Kickoff Meeting

dragonwellThe symposium planning kickoff meeting will take place on October 13th at the Dragonwell Bistro, downtown, at 5:30pm. Anyone interested in being a part of the planning for the 2017 Symposium should plan on attending. EWRG will be picking up the tab for the first round of drinks.

September Meeting Announcement

DATE:    Wednesday, September 28th
PLACE:  Hawthorne Lucky Lab Brew Pub, 915 SE Hawthorne Blvd
TIME:     11:30 a.m. Networking, 12:00 – 1:00 p.m. Presentation
SPEAKER:  Erik Bakkom, Maul Foster & Alongi
TOPIC: Zidell Waterfront Cleanup


zidellFormer ship breaking and salvage operations at the Zidell facility, located 3 miles upstream of the Portland Harbor Superfund site in the Willamette River, had impacted the upland and aquatic environment with polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), tributyltin (TBT), metals, and asbestos on this half-mile stretch of river. The remedy selected by the Oregon Department of Environmental Quality (DEQ) required soil and sediment caps to isolate contaminants, riprap armoring to resist river erosion, and bank grading to address slope stability. Following the Record of Decision for the site, an iterative design process was begun with the Oregon Department of Environmental Quality to develop the sediment and bank line cap design. The project manager encouraged the design group to develop concepts that would reduce ecological impacts associated with the remedy and its implementation, improving the chances of success during the Endangered Species Act consultation for listed fish (salmon and steelhead). During the design process, the team evaluated contaminant distribution, contaminant isolation, bathymetry, fluvial dynamics, bank stability, armoring against erosion, site operational considerations (vessel launching), hydraulics (impacts to flood elevation), ecological impacts, and infrastructure (e.g., municipal stormwater discharges, existing and proposed bridges). Investigation of these elements provided the design team a higher level of understanding of the site needs, resulting in a significantly modified and more complex remedy concept that integrated the bank and sediment cap components. In three construction phases the remedy was implemented to remove hot spot soils, to stabilize more than a half-mile of river bank and cap 12-acres of sediments, and then cap 30-acres of upland soils. The design team coordinated extensively with the City of Portland during the abandonment of a former city outfall and with TriMet for the construction of the Tilikum Crossing Bridge. The project was recognized in 2014 with ASCE/COPRI’s Project Excellence Award in the large project category. Erik will review the process of developing the complex remedial design for upland and sediment and how several significant challenges were turned into significant opportunities.


Erik Bakkom is a senior engineer at Maul Foster & Alongi, Inc. He has 17 years of experience in environmental engineering, focusing on brownfield/industrial site cleanup, sediment remediation, and solid waste planning and design. Erik has worked as part of various teams to bioremediate a large solvent plume adjacent to the Willamette River, to cap and redevelop the Astoria landfill to a high school sports complex, and construction of a mine waste repository in Idaho’s Silver Valley to address cleanup of the Couer d’Alene River. Erik began design work on the Zidell Waterfront Property cleanup in 2006 and has overseen construction between 2010 and 2016.