Erosion Control and Stormwater Management Summit

The Mid-Willamette Outreach Group (MWOG) hosts regional experts in the areas of stormwater management, erosion control, floodplain regulations, and regulatory agency permitting every year for an educational day of knowledge sharing. Continuing education credits are available for Engineers, Building Contractors and Landscape Contractors.

Click on the blue links below to view the 2019 presentations, and stay tuned for information on the 2020 Summit.

Mark Riedel-Bash, DEQ:  Complaints, Compliance, & Enforcement of Construction Permits

Mark Riedel-Bash has been with Oregon Department of Environmental Quality since 2013 and is currently the Stormwater Program Coordinator for DEQ’s Stormwater General Permit Program. Mark oversees DEQ’s municipal, construction and industrial stormwater permitting program and was the permit writer for the MS4 Phase II general permit. Mark received an undergraduate degree at California Lutheran University in Geology; and a Master’s Degree in Earth Science from Northern Arizona University. Mark previously worked as an environmental and geotechnical geologist in California and Oregon. email:

Roy Iwai-Multnomah County:  Finding Hidden Erosion: Successes & Challenges of implementing a Culvert Condition Inspection Program

Roy has managed the Water Quality Program in the Transportation Division of Multnomah County for the past 11 years. His recent work includes a program to increase the effectiveness of catch basin cleaning, a multi-jurisdictional stormwater map for the county, and the forming of a new stormwater outreach collaborative called the Clean Rivers Coalition. Roy has a Master of Science degree from Louisiana State University in Oceanography and Coastal Sciences with research in wetland biogeochemistry. Email:

Katie Holzer, City of Gresham: Pervious Pavement Test Project

Katie Holzer is a Watershed Scientist with the City of Gresham where she conducts studies of urban stormwater runoff and the effects on local streams. She has a Ph.D. in Ecology from the University of California, Davis where she studied habitat values of stormwater ponds. Email:

Amber Fox, City of Portland: Green Street Maintenance Program: Lessons Learned

Amber Fox is an Environmental Specialist for the City of Portland’s Bureau of Environmental Services. Amber works in the Watershed Revegetation Program managing projects and facilitating solutions to challenges in public bioretention facilities maintenance and design considerations. Her previous experience as a restoration ecologist and program management in non-profit, field ecology education, have served to inform the unique benefits and challenges related to GSI. She is a certified Arborist and CESCL, speaking for the trees, water, and soil to anyone who appears to be listening. In her free time, she enjoys farm life and the outdoors with her 3 horses and 2 dogs. When she is not riding horses or a tractor, she occasionally gets a chance to hike, snowboard, paint, or write bad poetry about the weather. Email:

Bob Marshall, ODOT: Large Slope Stabilization

Bob is the Erosion and Sediment Control Program Leader and the Roadside Development Program Leader for the Oregon Department of Transportation. I have held that position for a little more than two years. Work for which I am now responsible include revising the Erosion and Sediment Control Manual, keeping the ODOT Standard Drawings current, keeping the construction specifications current and to provide technical assistance to ODOT offices throughout the state. Also, I provide erosion and sediment control training for ODOT inspectors and contractor erosion control managers. Prior to that I worked for 25 years as a landscape architect for David Evans and Associates, an engineering and multidisciplinary consulting firm in Portland. My work with DEA was varied, as the profession of landscape architecture is varied, but the preponderance of my work was transportation related. Among work I conducted as a consultant was as erosion and sediment control designer for the (infamous and ultimately successful) Pioneer Mt. – Eddyville road improvement project on Hwy. 20 through the Coast Range. My education background is that I graduated with a Bachelor of Science degree in Landscape Architecture in 1989 from Cal Poly Pomona. Email:

Doug Singer, City of Eugene: Stormwater Retrofits

Doug Singer is a registered Professional Engineer in the State of Oregon and an APWA Certified Stormwater Manager. Mr. Singer has a BS from Oregon State University in Civil Engineering and a River Restoration Professional Certificate from Portland State University. Mr. Singer is a Principal Civil Engineer and Stormwater Capital Improvement Program Manager for the City of Eugene. Email: