Day 2 | April 25

Expand TracksGo to Day 1 Schedule
7:00am to 7:45am


7:45am to 8:00am

Welcome and Introduction

John Stark

8:40 to 11:40am

Breakout SessionsClick a presentation below to expand.

Track 1: Education & Outreach and Source Control
VideoPresentationHandout 1Handout 2

Interpretation in Communications: Bridging the Gap to Public Understanding

Michelle Perdue, Kitsap County


As someone who has an entire stormwater program to manage, communication seems like the least of your worries. However, your message is meaningless if it doesn’t get consumed. Data tells us how much people’s brains can consume at one time—so why are we consistently trying to “stuff more in” and wondering why they aren’t getting the message?

In today’s world there is a lot of competition for people’s attention. Jurisdictions need to get savvier about the way we are communicating to ensure our message is getting through. If your audience doesn’t HAVE to listen to you, why would they?

From outreach messaging to behavior change to training sessions, crafting your communications so that people take away just what you want them to is critical. The interpretive approach uses proven techniques to help you make those connections to your audience. It translates difficult scientific and technical terms into everyday language, bridging the gap between science and public understanding.

Case Study: Signage

Kitsap County worked with a consultant in 2012 to produce a suite of signs identifying green stormwater BMPs. The results were outstanding for their time, and the signs were widely shared.

Five years later, the world has changed, including people’s attention spans. The existing signs are now dated and no longer effective. With the lessons learned from an interim pilot project which applied interpretive principles to signage design, Kitsap is now applying this knowledge to the original BMP signs to renew them.

We will also present examples of how jurisdictions can apply interpretive principles to publications, web pages, and presentations to strengthen their overall communications and develop more focused messaging.

Learning Objectives.

No matter what region you reside in, the need to clearly convey your message on a day to day basis is critical to your mission. The learning objectives for this presentation are:

  • Why jurisdictions should care about good communications
  • Strategic framing of messages: how to boil your message down to its most essential elements
  • Designing your message to meet the audience where they are
  • Understanding the psychology behind why people consume the materials they do, and how to make your message the one that gets read
  • Helping you know what good messaging and design looks like, so that you can apply it whether you’re designing your own materials, or hiring a consultant or designer to do the work
  • Applicability: how these principles can apply to all your communications

This presentation will feature at least one case study of a project that will demonstrate the use of interpretive principles, including specific challenges faced during the course of the project and lessons learned.

Video Presentation

Panel: Engaging Private Property Owners to Control Stormwater On-site

Aaron Clark, Ph.D., Stewardship Partners; Jo Sullivan, King County RainWise Program; Cari Simson, Urban Systems Design; Derek Hahn, P.E., Snohomish Conservation District; Mary Rabourn, King County Department of Natural Resources and Parks


Across the Puget Sound region, cities, counties, conservation districts, and non-profits are offering incentives, cost-shares, and other implementation models for private landowners to improve water quality and flow control through installation of rain gardens and cisterns. As municipalities work to control stormwater statewide, private land can be incorporated into their larger planning efforts to help meet NPDES permits, while also engaging the public through meaningful projects.

Our panel of regional experts will guide attendees through the basic overview of each program with information about program costs, successes and lessons-learned, as well as efforts to address equitable access to the programs. The panel will provide tangible tools, tactics and metrics for municipalities that are considering a private property program to address their NPDES permit, including how to engage low-income, people of color, Veterans, and other populations that do not typically engage in stormwater programs.

Programs represented:
  • City of Seattle/King County’s RainWise rebate program has rebated over 1600 projects (2.17 million square feet of roof area captured) on residential, commercial and large roof buildings such as places of worship.
  • Snohomish Conservation District’s cost share and implementation model provides design/construction support and labor instead of a rebate; their program has installed over 500 projects and employs a military Veteran construction crew for implementation.
  • Stewardship Partners’ regional grant-funded incentive programs include a revolving loan and two small equity grants; they’ve provided thousands of dollars for equity grants and helped leverage and support large projects across King County.
  • King County’s incentive program (in pilot phase) for residential and commercial property owners in unincorporated King County will install projects that manage stormwater through rain gardens, cisterns, removal of impervious pavement and tree planting. Their program will be designed to address equity and help retrofit properties built before LID/GSI became required.

Sharing Outreach the Resource Reservoir: An Online Community

Mary Rabourn, King County


Creating outreach materials? There is science, data and best practices behind human design, messages, and evaluation. If you share the too common challenge of fulfilling many or all of the NPDES requirements, finding the time create a program or materials using those practices can be daunting. The Reservoir was designed and created by permittees help with that challenge. Users can find programs and materials to use for research, outreach, to be part of a larger program, or customize and apply to their projects. We will show how you can use the tool or consider building your own or how online strategies may help manage information. The best part: knowing how to see, access, and build on what is being done and be more successful in your outreach.

Learning Objectives.

The Reservoir’s online library is accessible to all permittee that request a login. Users can save time in accessing existing resources. There are contacts, images, graphics and other creative elements. It includes program background on research, approaches, evaluation. Outreach experience is crowdsourced as users add their tested materials to share.

  • How to info on Resource Reservoir
  • Tips on creating online tools
  • Easy access to outreach tools
  • Yes, related to creating online tool and strategy
  • Providing access to high quality ready to use outreach programs and materials.

Talking About Stormwater in Ways to Inspire People

Heather Trim, Zero Waste Washington; Betsy Adams, City of Kirkland


In order to reduce water pollution and excess flow problems associated with stormwater, Stormwater Outreach for Regional Municipalities (STORM) agencies, in partnership with nonprofit and other agency staff, conducted a research project to improve language and messaging used to describe stormwater, with a special focus on Low Impact Development/Green Infrastructure. This research project used a modified social marketing approach to look at words and messaging used to convey awareness and action to the public.

The goal was to deeply examine and question previous assumptions about stormwater messaging and to develop high impact, effective messaging that can be used consistently by all throughout the region. We had some surprising and interesting results.

This presentation will present the outcomes of this effort, including focus group and survey results. Tips and suggested wording will be included.

Learning Objectives.

Effective communication is a critical part of the required education components of the NPDES permits. This presentation will provide specific (and tested) messaging and communications framing.

Track 2: Research and Green Stormwater Infrastructure

Results from a Regional Stream Status and Trends Monitoring Program

Rich Sheibley, USGS


In 2015, the condition of Puget Sound Lowland streams was evaluated by collecting data for stream invertebrates, algae, water quality, sediment quality, and instream and riparian habitat at approximately 100 sites across the region. In addition, riparian and watershed-scale land cover data were compiled to aid in the evaluation of factors associated with poor (or good) biological condition. The study was the first large-scale regional assessment of stream condition conducted as part of the Stormwater Action Monitoring (SAM) program, a collaborative, regional stormwater monitoring program funded by more than 90 Western Washington municipal stormwater permittees. We used boosted regression trees and a relative risk/attributable risk analysis to determine the most important human and natural factors explaining poor biological condition in the region. Key stressors driving poor Benthic Index of Biotic Integrity (B-IBI) scores were landscape-scale watershed characteristics, physical habitat, nutrients, sediment zinc, and stream substrate characteristics. Watershed and riparian canopy cover were found to be the most important stressors to B-IBI scores at the regional scale. For the trophic diatom index, the most important factors causing poor condition were mean summer total phosphorus and nitrogen concentrations and watershed urban development. Identified key stressors and stream status in this study can help water managers to develop effective restoration and management practices. Results also provide unbiased regional estimates of stream condition that can provide context for local Puget Sound jurisdiction monitoring data. SAM plans to continue gathering stream status and trend data in the region. Over time it is expected that this monitoring effort will tell us whether our overall management strategies, including stormwater management, are improving stream health.

Learning Objectives.

Permittees will see the results of the permittee-funded 2015 Stormwater Action Monitoring Puget Lowland stream study and implications for management. Permittees will see example of monitoring tools/techniques that might be useful within their own jurisdictions. Lessons learned from this study will inform changes to the study design as the program moves forward.

Video (Bioretention)Video (SAM)Presentation (SAM)Presentation (Bioretention)

Bioretention: What Have the SAM Studies Shown Us?

Isabella Burzynski, Nicole Chen and Leland O’Hanlon, Gonzaga University; Brandi Lubliner, Washington State Department of Ecology; Aimee Navickis-Brasch, Osborn Consulting

What Have the SAM Studies Shown Us.

Bioretention is a commonly applied LID best management practice (BMP) for new developments and for added treatment in older developments. The magnitude and costs to adapt infrastructure necessary to manage stormwater in Washington State is substantial. Stormwater managers want to know that these facilities perform as intended for flow control and which pollutants are treated so that they can confidently install them in new and redevelopment projects across their jurisdictions.

Stormwater Action Monitoring (SAM) is a cooperative monitoring program under the municipal stormwater permits in western WA. SAM has eleven studies to date focused on some aspect of the bioretention best management practice (BMP); hydrologic performance, sizing, the engineered soil medium, toxicity removal, pollutant removal, maintenance, and owner perceptions.

So far, the studies confirm that properly designed and located bioretention facilities perform well, providing the model predicted flow control, measurable water quality benefits, and if maintained are well received by the public. Studies are also trying to improve the bioretention soil media to reduce phosphorus export and maintenance needs.

This talk will cover objectives and findings where available for the SAM bioretention studies. Come hear about performance to model expectations, media blends being tested for a no/low phosphorus export, several retrofit experiences with vastly different sized facilities, contaminant treatments, facility owner perceptions on bioretention, plant survival, and more.

Learning Objectives.

SAM studies are specifically intended to provide stormwater managers and decision makers scientific information to improve their programs, permits and manuals.

Bioretention Media Thickness and Cold Climate Study.

This project focuses on monitoring and evaluating the effectiveness of a dual cell bioretention pond that is located on Gonzaga University’s campus in Spokane, Washington. The cells each contain the Ecology approved bioretention soil media (BSM) which is composed of 40% compost and 60% sand. The primary difference between the cells is one cell was constructed to the required minimum depth of 18-inches and the other to a depth of 12-inches. Spokane County constructed this test-site in the fall of 2014 as part of their NPDES MS4 permit requirements for monitoring, specifically evaluating the effectiveness of stormwater BMPs. The study is being conducted in partnership with Gonzaga University and each year a team of senior civil engineering students contribute to the study. The goal of the effectiveness study is to evaluate and compare the runoff treatment performance of two different depths of BSM. If the results of the study indicate that the treatment performance of the two cells is statistically insignificant, the results will be used to justify a modification to the Ecology approved design guidance for bioretention areas that reduces the minimum depth to 12-inches. In addition, the goal of the study is to understand the influence of cold climates and deicers on the treatment performance of this BMP.

Learning Objectives.

The objective of this presentation is:

  • Describe how Spokane County is partnering with Gonzaga University to meet their effectiveness study requirements and how this approach could be applied by other permittees to meet similar requirements.
  • Provide an overview of results collected to date including comparing results from this study to similar studies conducted in WWA.
  • Discuss lessons learned in field monitoring structural BMPs and adjustment that we made to improve the quality of the data collected.

Is Stormwater Harming Our Streams? Long-term Monitoring of Metals

Daniel Nidzgorski, King County


Water-quality problems in urban and suburban streams are commonly blamed on stormwater pollution—but actual pollutant data for the receiving streams are much more limited. To understand the extent and nature of toxicity due to metals, we analyzed 18 years (1993-2010) of metals concentrations in wet-weather streamflow from 33 stream stations across King County, Washington. We assessed aquatic and human-health toxicity using state and federal regulatory water quality standards (WQSs), plus non-regulatory salmonid-specific screening values (SSVs) since concentrations below the WQSs have been shown to harm salmonids. In addition, we tested for long-term trends, and compared stormflow and baseflow concentrations (during 2001-2003 when metals were also measured in baseflow).

To begin identifying and addressing pollution sources, we used a stoichiometric signal of weathering inputs (which includes both natural and human-accelerated erosion). When weathering is the dominant input, total concentrations of many metals have been shown to correlate well with total iron concentrations, since iron is naturally present at high enough concentrations to dwarf anthropogenic non-weathering inputs.

Metals in wet-weather streamflow caused some potential aquatic toxicity, especially for salmonids. Mercury concentrations were frequently above the chronic WQS: 70% of streams had at least one exceedance. Copper, lead, and zinc concentrations were commonly above the SSVs (30% of all samples from all streams for copper, >30% for copper, and >90% for zinc).

Concentrations of most metals in most streams were well-correlated with iron. This suggests that the major source of these metals of concern was increased erosion (either natural or human-accelerated), rather than other types of pollutants. The iron-correlation analysis also identified a few streams that had multiple metals from non-weathering sources and would benefit from detailed pollution tracking.

Chromium, copper, lead, and nickel concentrations showed regional decreases over time. Calcium and magnesium concentrations increased, which can reduce the adverse effects of toxic metals. However, several individual streams had increasing trends in one or more toxic metals, so water quality has not improved universally.

Learning Objectives.
  1. Metals in streams are a widespread concern, especially for salmonids.
  2. Metals concentrations have been decreasing over time.
  3. Iron correlations offer a useful tool for separating pollution sources from weathering sources, whether persistent patterns or isolated events.

Panel: Using Research Outcomes to Inform Solutions for Highway Runoff

Lisa Rozmyn, Washington Stormwater Center; Claire Duchet, Benjamin Leonard and Lane Maguire, Washington State University


Both U.S. E.P.A. and Washington State Department of Ecology write municipal storm water permits for transportation activities, such as for Washington State Department of Transportation. Many of these are for roadways. WSU research indicates that roadway runoff is causing harm to coho salmon. Although we have found that highway runoff is a threat to aquatic life and possibly human health, WSDOT and our researchers are partnering to develop solutions. This—in combination with WSDOT’s NPDES permitting requirements—is helping to protect water quality. A panel of researchers will discuss what we’ve learned about highway runoff, what are current and possible future solutions and what are the next steps to mitigate and eliminate runoff pollution from roads and highway systems.

Learning Objectives.

WSDOT is a statewide municipality with coverage under an individual MS4 permit. Both eastern and western Washington municipalities will learn about the work WSDOT is doing statewide, and be given the opportunity to find out what the WSDOT permit requires in and near their jurisdictions. This will allow for ongoing and future collaborative efforts for the protection of water quality statewide.

Track 3: Stormwater Planning and Retrofits

Phase I Structural Stormwater Control Requirements: What Phase IIs Should Know

Ingrid Wertz, City of Seattle; Emma Trewhitt, Washington State Department of Ecology


There is a new requirement in the draft Phase I permit (S5.C.7) that Permittees must achieve a designated number of points for their structural stormwater control projects during the 2019-2024 permit term. This will require millions of dollars in investments in retrofitting existing developed areas and other projects to address stormwater impacts not controlled by other permit requirements. Phase IIs currently do not have a structural stormwater control requirement; however, the Phase I requirement may inform future Phase II permits.

This presentation will provide a high-level overview of the incentive point methodology in the draft Phase I permit including allowable project types, how points are assigned, and required points for compliance.

In addition, Phase Is will share their perspectives on some of the strengths and challenges associated with this draft permit requirement. Phase Is will also talk about the work to date to advocate for further study of the point framework through additional technical and stakeholder input during the 2019-2024 permit term. The objective of the further study is to make recommendations for future permit requirements to better direct investments to projects with the highest priority environmental outcomes. Phase IIs would be key participants in this process.

Learning Objectives.

This presentation will benefit all permittees by raising awareness of the Phase I permit requirements and the work being done to achieve effective results. It will identify strengths and challenges associated with the draft Phase I S5C7 Structural Stormwater Control requirements, and is intended to generate support for further study and stakeholder input on this requirement during the 2019-2024 permit term to improve the efficiency of permit compliance by better directing investments to projects with the highest priority environmental outcomes in future permits.


Small Footprint Urban Retrofit Case Study for Municipal/Industrial Applications

Bronwyn Rolph, Kennedy/Jenks Consultants


The Port of Port Angeles (Port), situated on the Port Angeles Harbor on Washington State’s Olympic Peninsula, is a distribution hub for Pacific Northwest forest products across the globe. Log handling and import/export operations at the Port’s Terminal 3 wharf and upland support and adjacent cargo surge areas (Marine Terminal) support hundreds of jobs, fueling the local economy. Marine Terminal runoff may also entrain pollutants impactful to receiving waters. When stormwater monitoring indicated improvements were needed, the Port engaged Kennedy/Jenks Consultants (KJ) to assist with development of conveyance and treatment alternatives. Considering numerous vendor-supplied and non-proprietary technologies, KJ recommended a centralized, low-impact, vegetated, biofiltration approach based on a very successful system operating at a Port of Tacoma, WA (PoT) logyard terminal.

The Port agreed, initiating a phased program to upgrade its Marine Terminal conveyance and treatment systems. Like most over-water structures, Marine Terminal wharf runoff drained directly to the harbor through vertical deck drains and horizontal scuppers along wharf access ramps and the bullrail. Several collection and conveyance options were considered to capture and convey this water inland for treatment including under-wharf piping, re-grading wharf and access ramp surfaces, installing gutters, etc. Considering tidal and storm surge concerns, required operational grades, and construction costs the Port selected to abandon existing drainage structures, build-up the bullrail, and re-grade the wharf to drain inland. Upland areas would also be re-paved draining runoff from the Marine Terminal through a new collection system and pump station, sending required flows to a less crucial neighboring area for treatment.

During construction of Marine Terminal wharf and conveyance improvements in 2016, the Port conducted a site-specific pilot study to nail down the basis of design for a vegetated biofiltration system expanding on the protocol supporting the PoT logyard design. Pilot study results from testing multiple flowrates, considering both hydraulic capacity and pollutant effectiveness, showed impressive water quality improvement at infiltration rates up to 24 inches per hour using City of Seattle-specified biofiltration soil media (BSM).

Applying lessons learned from four years of PoT logyard operations, and considering site-specific pilot testing results, K/J designed a three-stage biofiltration system constructed in the fall of 2018. The treatment train includes a preliminary coarse aggregate filtration cell, followed by a vegetated biofiltration component, with a third polishing cell with appropriate media specified if found to be necessary based on preliminary performance monitoring.

This paper will detail the work performed to bring this important project to fruition from initial runoff characterization, pilot testing, preliminary and final design, through construction, startup, preliminary operations, and extended monitoring. The information presented will be relevant to industrial, commercial, and municipal owners, operators, planners, and engineers seeking big water quality improvements in small available spaces.

Learning Objectives.

This paper will detail the work performed to bring this important project to fruition from initial runoff characterization, pilot testing, preliminary and final design, through construction, startup, preliminary operations, and extended monitoring. The information presented will be relevant to industrial, commercial, and municipal owners, operators, planners, and engineers seeking big water quality improvements in small available spaces.

  • How will this benefit permittees in Eastern and/or Western Washington? This paper will discuss retrofit solutions applicable to both sides of the Cascade Range.
  • What tools will permittees take away from this presentation? Design approaches and real-world data applicable to their projects.
  • Does this presentation identify specific challenges and/or lessons learned? - Yes from this project and it’s predecessors.
  • How will this presentation improve efficiency of municipal permit compliance? Providing effective retrofit solutions for tight spaces.

Retrofits in Forbes Creek: Focus on Efficiency and Community Benefits

Amy Carlson, Jacobs Engineering; Jenny Gaus, City of Kirkland


The task facing all of us as stormwater practitioners is how best to retrofit our stormwater system to meet ecological outcomes that contribute to meeting recovery targets for Puget Sound. Investments made across the Puget Sound area over the last decade have provided information on which technologies and approaches are most applicable in different scenarios. Other challenges include planning and designing these retrofits most efficiently with limited resources, and how and where to implement these retrofits to reduce the impact on, and provide benefit to, the community. This presentation describes lessons learned by the City of Kirkland on delivery efficiencies and on providing community benefits, while achieving goals of water quality and peak flow reduction by means of stormwater retrofit projects planned for the North Rose Hill Basin of the Forbes Creek Watershed.

Despite City of Kirkland’s stormwater management efforts, Forbes Creek remains 303(d) listed for fecal coliform bacteria, temperature and dissolved oxygen. The Water Quality Index was noted as 30, or Poor in 2014. The Biological Index of Biotic Integrity is also in the Poor range at 14-18. The North Rose Hill sub-basin was chosen for this planning effort because the 230-acres comprises about 13% of the Forbes Creek watershed area, and yet contributes about 30% of the peak flow during a 2-year storm event. The North Rose Hill basin is mainly residential developed before modern stormwater management standards were in effect and before this area was incorporated into the City of Kirkland in the early 1980s.

The City of Kirkland is the recipient of a Washington State Department of Ecology grant that funded planning activities that included site identification, soils/geologic analysis, public engagement, and hydrologic modeling that were used to inform 30% design for three identified retrofit projects and the preparation of an implementation plan that includes funding strategies tied to the identified projects. This presentation will describe the City of Kirkland’s efforts to conduct these planning and pre-design activities efficiently to maximize return on investment. In addition, this presentation will also describe how the City of Kirkland balanced sometimes competing desires of the community with the water quality and hydrologic needs of the projects.

Learning Objectives.

We will share lessons learned on the North Rose HIll Subbasin stormwater retrofit project within the City of Kirkland that have to do with efficiency (from site identification through preliminary design). We will also share lessons learned in modifying concepts and designs to reflect community preferences and to maximize opportunities for community benefit.


Country Homes Boulevard Restoration Project a Green Infrastructure/LID Retrofit

Colleen Little, Spokane County


The Country Homes Boulevard Restoration Project converted a mile-long, 30-foot-wide, asphalt V-ditch channel into a beautiful water quality stormwater retrofit facility in 2014. The entire project, aside from median islands at each end that serve as entry features to the project corridor, is within a FEMA designated floodplain. The V-ditch conveyance channel was replaced by a 48-in squashed pipe which was buried under a fully- landscaped bioinfiltration swale. 18 inches of highly organic bioengineered soil was used for pollutant capture and treatment, and to encourage healthy plant growth. The $2.1 million dollar project was funded by two stormwater grants from Washington State Department of Ecology totaling $1.75 million dollars. Both grant awards were 75/25 match funding; Spokane County’s 25% match was facilitated through stormwater fees collected in high impact drainage areas in need of stormwater retrofit. The conclusions or analysis that I would present would include that the project was a success despite the significant challenges that go along with a full-scale construction project within a 25,000 ADT arterial corridor; i.e., keeping one lane open, facilitating school bus schedules, very tight equipment work-zone corridor, year-round groundwater complications, and citizen concerns about finished product, costs, maintenance, and disruption to their lives during construction.

Learning Objectives.

The primary learning objectives for the presentation would include:

  • Navigating FEMA CLOMR / LOMR process when proposing a significant overhaul / rehabilitation within a floodplain corridor (timing, permitting, public process)
  • Mile-long water quality facility (large multi-segmented bioinfiltration swale concept; hybrid with plants, shrubs, trees and ornamental grasses vs sod); Bio-engineered soil (mix design, challenges); 25,000 plants used in facility (need, purpose, goals, how procured, sight distance challenges, soil regeneration)
  • Current maintenance versus maintenance goals long-term
  • LID Green Infrastructure as current trend; Lessons learned, and future goals
Track 4: Investigations & Mapping, Inspections and Review

Mapping: Where You’re Headed & How to Get There

Jennifer Schmidt, Herrera


Beginning August 2021, all mapping requirements referenced in the Phase I and Western Washington Phase II Municipal Stormwater Permits must be in electronic format with fully described mapping standards. However, the scope of these requirements is broad, and it can be challenging for jurisdictions to determine how best to leverage their existing data to meet them. The goal of this presentation is to help attendees break down the mapping requirements from these permits into specific steps that can be implemented in GIS. We will go over each of the mapping criteria in Section 5.C of the permits in detail and discuss strategies for how to approach them in GIS using specific examples from local municipalities. We will look at questions like:

  • What is the difference between outfalls and discharge points and how do you identify them in GIS without conducting an exhaustive field inventory?
  • How do you determine how close a point needs to be from a waterbody in GIS to be considered a discharge point, and how does slope factor into these considerations?
  • What are some approaches for automating the mapping of the contributing drainage areas for tributary conveyances to known outfalls?
  • How can you identify areas that don’t discharge stormwater to surface water over large geographic areas?
  • In addition, we will present a couple examples of how GIS can be used to map areas that are infeasible for implementing specific BMPs like bioretention or permeable pavement using specific criteria provided in the 2014 (and 2019) SWMMWW.
Learning Objectives.
  • How will this benefit permittees in Eastern and/or Western Washington? This session will help permittees develop or refine their strategy to meet the electronic mapping requirements that are effective in 2021.
  • What tools will permittees take away from this presentation? We will provide permittees with tangible strategies for meeting the permit mapping requirements in GIS.
  • Does this presentation identify specific challenges and/or lessors learned? We will discuss some limitations of GIS data, when field work is really the best route, and issues that we have had to address while working through this process with different municipalities.
  • How will this presentation improve efficiency of municipal permit compliance? We will try to clearly and succinctly summarize what the mapping requirements are and how to use GIS to meet them.

Illicit Connections, Illicit Discharges, and Identifying Sources of Stormwater Pollution: Latest Information on IDDE Field Screening and Source Tracing Methods

Jeanne Dorn, King County; James Packman, Aspect Consulting


This presentation will provide a summary of work to date on a project to update the 2013 Illicit Connection and Illicit Discharge (IC/ID) Field Screening and Source Tracing Guidance Manual published by King County and to provide trainings on it to municipal staff throughout western Washington. The project, which is funded by municipal stormwater permittees via Ecology’s Stormwater Action Monitoring (SAM) program, will provide timely updated information on new technologies and field methods to support implementing the illicit discharge detection and elimination (IDDE) requirements of municipal NPDES stormwater permits. The goals of this presentation are to inform municipalities of this work in progress, to convey some of the updated IC/ID methods identified to date, and to encourage municipalities to send field staff to the trainings, which will be held at various locations in western Washington in the spring and summer of 2020.

As the lead agency for the project both in 2013 and presently, King County seeks to convey the importance and the usefulness of the IC/ID Manual for water quality protection within the framework of NPDES IDDE requirements. By publishing an updated manual and providing trainings on IC/ID field methods concurrent with the next issuance of the municipal stormwater permits in Washington, the outcomes from this project will help municipalities who are implementing new IDDE programs as well as those who have had IDDE programs in place for years. The methods can also be used for attaining objectives under other elements of the NPDES permits, including total maximum daily load (TMDL) evaluations, source control business inspections, education and outreach efforts, and pollution identification and correction (PIC).

*Available at​Portals/​_1962/​Documents/​SAM/​LakewoodD7.7-IDDEfinalreport.pdf; ​Fact sheet at​Portals/​_1962/​Documents/​SAM/​FS%23005_Illicit_discharge_detection.pdf

Learning Objectives.

This presentation will benefit Phase I and II NPDES municipal stormwater permittees from both E. and W. Washington by providing updates on IDDE technologies and field methods, and announcing upcoming trainings in year 2020 to be held in W. Washington, open to municipal staff from both Eastern and Western Washington.


Municipal IDDE Program Update to Integrate Bacteria TMDL Screening

Julie Brandt, Parametrix; Kristin Terpstra, City of Bothell


The City of Bothell recently overhauled its NPDES Illicit Discharge Detection and Elimination (IDDE) program to integrate bacteria screening based on the North Creek total maximum daily load (TMDL). As a result of this project, the City has learned that while bacteria are upsettingly difficult to trace, there are several straight-forward, cost-effective approaches that can make the job easier for most situations. In the remaining cases, the effort will always require creativity, improvisation, and a toolbox of lesser-used techniques to trace the bacteria source; however, it is not always worth the time and money to use every screening approach for every possible source. More is not better.

The effort setup a 5-year roadmap to integrate the separate Phase II Municipal Stormwater NPDES Permit IDDE program with the TMDL bacteria screening based on the following goals, which will be discussed in detail during the presentation:

  • NPDES Requirements: Identified and evaluated relevant IDDE & bacterial screening requirements of the NPDES Phase II Municipal Stormwater Permit, discuss City-specific needs and goals, reviewed current screening practices and information, and identified program gaps to develop a prioritized compliance response.
  • Compared Other Jurisdictions: Interviewed and collected information from other jurisdictions regarding their current and past efforts to address bacteria TMDLs in their own drainage basins and identified tested approaches that can be adapted in an effective, practical, and affordable way for Bothell’s use in the long-term.
  • Key Stakeholders: Obtained feedback from cross-division managers and City road and maintenance crews to identify key elements that will support successful program implementation and to avoid ideas that would be impractical for field work or would not achieve permit compliance.
  • Future Long-Term Strategy: Ranked the recommended action items for infrastructure, environmental impact, cost, and current staff abilities and needs to develop annual screening targets, bacteria tracing techniques, staff training curriculum, and future mapping needs.
  • Updated IDDE Manual: Effectively communicated the recommended IDDE and bacteria screening strategy in written format accessible to a broad spectrum of City staff including surface water group members, field crews, and City Council members.
  • Ecology Report: Documented the high-level IDDE and bacteria screening strategy for Ecology.
Learning Objectives.

After building on the work of neighboring jurisdictions and vetting multiple bacteria screening techniques, the City is sharing this information to help other municipalities quickly select approaches that are right for their communities. This presentation will be relevant to any Eastern or Western Washington municipal NPDES permittee that has humans or animals (the most common sources of bacteria) present in their jurisdiction, with special relevance to those with a TMDL water body.


Utilizing Asset Management Software for IDDE Tracking & Reporting

Melissa Ivancevich, City of Shoreline


The City of Shoreline (City), Washington, is using asset management software (Cityworks) to manage Illicit Discharge Detection & Elimination (IDDE) tracking and reporting to not only exceed the 2013-2018 NPDES permit requirement, but to also meet expectations for transparency and interdepartmental coordination.

In 2013, the Department of Ecology (Ecology) developed an IDDE tracking form; however, the tracking form was not available when the permit was issued in 2012 with a legislative-mandated one-year delay. Therefore, the 2013-2018 NPDES permit does not require the use of Ecology’s 2013 IDDE tracking form. In 2013, the City took a proactive approach to IDDE tracking and began utilizing Cityworks to voluntarily implement Ecology’s form. The City uses Cityworks to track and report illicit discharge notifications, investigations, and illicit connection removal. Cityworks manages the process in one application and uses a mobile-friendly inspection form, thereby streamlining program administration.

This presentation is aimed at sharing the City of Shoreline’s experience in utilizing Cityworks over the last five years to track and report IDDE, including saving the City time and resources, and facilitating interdepartmental communication and coordination. The goal of this presentation is for Permittees, Regulators, and Consultants to learn from the City of Shoreline’s experiences in light of the upcoming 2019 NPDES Permit and learn how IDDE data can be utilized to inform other sections of the Permit.

Learning Objectives.

This presentation is aimed at sharing the City of Shoreline’s experience in utilizing Cityworks over the last five years to track and report IDDE, including saving the City time and resources, and facilitating interdepartmental communication and coordination. The goal of this presentation is for Permittees, Regulators, and Consultants to learn from the City of Shoreline’s experiences in light of the upcoming 2019 NPDES Permit and learn how IDDE data can be utilized to inform other sections of the Permit.

11:40am to 12:40pm Municipal Stormwater Project Showcase Slideshow

Lunch Keynote

Jay Manning, Cascadia Law Group

12:40 to 4:30pm

Breakout SessionsClick a presentation below to expand.

Track 1: Education & Outreach and Source Control

Sharp Avenue Pervious Pavement and Stormwater Infiltration Treatment Analysis

Eric Lester, City of Spokane


The Sharp Avenue street improvement project utilized two different types of permeable pavements (porous asphalt and pervious concrete) are to be constructed on Sharp Avenue. A liner and underdrain has been installed for collecting treated stormwater runoff. The underdrains will connect to a sampling monitoring station for effluent sample collection and subsequent water quality analysis.

The goal of this study is to assess the effectiveness of permeable pavements with respect to durability, infiltration rates, and water quality. The City proposes to sample the influent and effluent stormwater concentrations. Effluent sample concentrations will be measured after infiltration through the permeable pavement and sub-base. Furthermore, the City proposes to monitor durability and infiltration rates of the permeable pavements.

Learning Objectives.

Stormwater pavement runoff will be collected and treated via controlled soil infiltration process. Samples of treated effluent will be collected and analyzed against control samples to verify treatment efficacy. If tests confirm successful results the City of Spokane will consider utilization of infiltration treatment on future projects that have favorable in-situ conditions that may exploited. Post construction test analysis will be incorporated into a project test report that will be shared with Spokane’s Eastern Washington municipal neighbors and with the Department of Ecology Water Quality for assessment.


Creative Integration of Diverse Organizations to Manage Stormwater

Blair Scott and Darren Greve, King County; Marcia Davis, City of Spokane; Brandy Reed, King Conservation District


Managing stormwater in Western Washington is challenging and expensive, yet critical for the health of our water bodies, wildlife, and human population. Pressures from population growth, urban development, and climate change further threaten to cause larger and more challenges, which complicates the management of stormwater. Federal, State, and local laws and regulations provide a foundational framework for coordinating management of water quality and quantity in the region. However, permit compliance can be considered “the minimum effort” needed to manage stormwater effectively and this compliance can also be very costly. Therefore, creative ways to manage stormwater can be found when utilizing the funding and frameworks of other agency efforts and initiatives whose original goals were not directly to improve water quality. For example, many agencies are looking to plant more trees, preserve open space, reduce urban heat island impacts, and model for future weather conditions. These goals, perhaps inadvertently, can also support and align with stormwater management goals. Government agencies, universities, and other organizations may also have separate funding sources to cover the costs of these objectives. Stormwater managers would benefit from breaking out the confines of permit compliance, and reaching across to other sectors to help assist with stormwater management best practices, find funding, and increase the intersection across diverse organizations that aim to improve the stormwater resilience of the region. This panel will discuss several initiatives in the Puget Sound region and how they are working together to manage stormwater more effectively. These initiatives include; King County’s 1M Trees and Land Conservation Initiatives, the Institute for Sustainable Solution’s work on reducing urban heat islands and relevant greening efforts, and the King Conservation District’s Urban Tree Canopy and Stormwater Analysis project (bringing foresters and stormwater managers together). This panel will also touch on a modeling study conducted by King County aimed at determining if the region will need to size stormwater facilities larger under various climate change emissions scenarios. We will have each panelist address the following questions; (1) what existing organizations can help to advance crossing institutional boundaries to address stormwater management; and (2) what practice and research needs are priority for advancing cross-sectoral integration for managing stormwater?

Learning Objectives.

This panel discussion will benefit permittees by challenging them to think outside of permit requirements for stormwater management and ways to fund water quality improvements. They will walk away with tools regarding, how to reach across disciplines to work on common goals and share funding that could ultimately lead to more successful and collaborative outcomes. The presentation will identify the challenges in funding permit compliance and some lessons learned on how to work across agencies to more creatively address stormwater management issues, which leads to more efficient permit compliance.


Tips and Tricks for Developing an Engaging Source Control Program

Danielle Driscoll and Kerry Neil, Snohomish County Public Works, Surface Water Management Division


Snohomish County implements a Source Control Business Inspection Program that focuses on working with commercial and industrial businesses to control pollutants at the source while utilizing an education and outreach approach. County Pollution Prevention Specialists inspect businesses performing activities that could potentially pollute surface waters and the County’s MS4. On-site business inspections are designed to reduce or prevent pollutants from entering the MS4 and ensure businesses implement Best Management Practices (BMP) pertinent to their site. While providing BMP technical assistance, the County is successfully protecting water quality and maintaining relationships with the business community.

Permittees will learn the basics of a Source Control Program including: authority to require BMPs at businesses, lessons learned while developing the business inventory list, process of conducting a business inspection to observe BMP usage and ensure BMP effectiveness, different BMPs for a variety of pollutants and business sectors, critical information to track, elements of a database structure, communication techniques, and progressive code enforcement strategies.

Over the years, Snohomish County has developed creative and practical strategies for implementing a Source Control Program all while successfully meeting and exceeding permit requirements. The County has navigated issues related to accessing private property, establishing outside agency partnerships (e.g. Conservation Districts, Health Districts) and working with agricultural and livestock operations.

Phase II Permittees preparing for the new permit requirements will benefit from learning how Snohomish County developed and implemented its business inspection program in a service area with both urban and rural businesses working with a variety of pollutants.

The County continues to develop and implement Source Control Program enhancements. Our future work includes facilitating more creative partnerships, promoting regional stormwater campaigns, fostering more collaboration with Phase II permittees in Snohomish County, and using social marketing techniques to develop pollutant targeted educational handouts for businesses.


Using Lean/Kaizen to Make Source Control Inspections More Effective

Kevin Buckley, Seattle Public Utilities; Jessica Branom-Zwick, Cascadia Consulting Group


Learn how the source control business inspection team at Seattle Public Utilities (SPU) reduced median time to compliance by one-third. The presentation will share SPU’s process, techniques, implementation, and lessons learned regarding a Lean process that improved the effectiveness of the program. Lean (also known by its Japanese name, Kaizen) is a business and process improvement approach that focuses on continuously improving efficiency to minimize unnecessary steps while delivering value for customers and the environment. In January 2016, SPU’s source control program began a Lean transformation to bring businesses into compliance more quickly and efficiently. The business inspection team conducted a one-week Lean event, facilitated by OfficeRocket, a consulting organization, to collaboratively identify goals for the Lean transformation, barriers to efficiency, opportunities for improvement, and a plan to implement improvements. Over the next two years, the team worked together to implement improvements and identify further opportunities. In 2018, SPU commissioned an independent program evaluation from Cascadia Consulting Group, which found that the changes SPU made to the business inspection program resulting from the Lean effort substantially improved the effectiveness of the program.

Learning Objectives.
  • How will this benefit permittees in Eastern and/or Western Washington? Phase I and II communities can learn how to implement tools to improve the efficiency and effectiveness of their source control inspection programs. SPU has already investigated, piloted, and implemented these tools-and an independent evaluation has shown them to work. Specific benefits are that customer service has been improved and businesses are coming into compliance with source control requirements quicker than before the Lean process was implemented.
  • What tools will permittees take away from this presentation? - A better understanding of the Lean process and how it can be used to improve the effectiveness of their source control programs. It is hoped that by attending this presentation permittees will understand how to structure their source control inspection program so that entities pathway to compliance is quick and that entities stay in compliance longer. They will also take away lessons learned and specific improvements that SPU made to its program to speed up time to compliance.
  • Does this presentation identify specific challenges and/or lessors learned? Yes, the presentation will present lessons learned around what level of effort is needed to sustain the Lean process once implemented.
  • How will this presentation improve efficiency of municipal permit compliance? The focus or this project was to evaluate the effectiveness of Seattle Public Utilities business inspection program for compliance with S5.C.7. The entire project is focused on improving the efficiency and effectiveness of source control inspections, which are required by both Phase I and II communities. This project was not selected to be completed as part of the SAM program so there is no fact sheet available to permittees and interested parties on this effectiveness evaluation. Presenting at MUNICON is the perfect venue to provide this valuable information to permittees.

Common Source Control Problems and Innovative Routes to Compliance

Alison Schweitzer, King County


This presentation will review common problems observed during source control inspections, innovative solutions businesses have implemented to achieve compliance, and lessons learned from these inspections. This topic is relevant to all Permittees because it is anticipated that all Permittees will be required to perform these inspections during the next municipal stormwater permit cycle.

Source control inspections are performed at commercial, industrial and multifamily properties in order to identify stormwater compliance issues. Sites with problems are required to implement corrective actions but instead of specifying a specific pathway to compliance, it can be much more effective to allow businesses to choose their own innovative routes to compliance. By giving businesses flexibility, they will come up with creative solutions that they are more vested in and will create a deeper connection to stormwater management that will persevere long after the inspection. Source control inspections are similar across Washington, but solutions to compliance can vary depending on climate, topography, and stormwater infrastructure. Therefore, instead of providing a prescribed solution, source control inspectors must help businesses first understand the “why” behind the regulations and then provide businesses flexibility to create their own innovative route to compliance.

Source control inspections are a valuable component of a Permittee’s stormwater program and, when used effectively, can not only help to reduce the sources of stormwater pollution, but can also identify illicit discharges, strengthen relationships with the community, and educate the public about stormwater management. It is important to educate people about source control, but education alone doesn’t effect change. These inspections allow jurisdictions to help businesses and property owners make the connection of how their actions impact stormwater pollution and thus their surface waters, which they aesthetically enjoy, recreate in, and eat food from.

Learning Objectives.

This presentation will benefit Eastern and Western Washington because it is anticipated that all Permittees will be required to perform source inspections during the next municipal stormwater permit cycle. Permittees will take away strategies to improve or help build their source control program to streamline compliance. This presentation identifies lessons learned to help businesses achieve and maintain compliance by allowing businesses to be creative in their route to compliance. By providing this flexibility, businesses are more likely to be vested in their solution and maintain compliance. This presentation also highlights the importance of educating businesses on why these stormwater regulations matter, connecting their actions to surface water quality.

Track 2: Research and Green Stormwater Infrastructure

Infiltration Feasibility Assessment To Successful Infiltration Design and Performance

Jennifer Saltonstall, Associated Earth Sciences, Inc.; Curtis Koger, L.E.G., L.Hg.


We present key findings for successful subsurface geologic characterization and estimating design infiltration rates for a range of project types. We review infiltration feasibility assessment fundamentals and design concepts, the pilot infiltration test (PIT) procedure and grain size correlation method, discuss the geology of Puget Sound, and describe how water moves through the subsurface in different hydrogeologic settings. The work is based on over 20 years of infiltration studies as part of land use application and retrofit projects, and recent work conducted as part of the Bioretention Hydrologic Performance Study (funded by Stormwater Action Monitoring). The presentation will provide guidance for municipal permit reviewers on what is contained in a geotechnical report and provide design professionals with key ‘lessons learned’ to improve infiltration design.

Learning Objectives.

Practical discussion of what goes into subsurface characterization and estimating design infiltration rates. Key portions of geotechnical and drainage/stormwater reports will be highlighted, to help reviewer identify mis-matches in subsurface characterization and proposed infiltration design. Specific examples will be provided.


Enhancing the Functionality of Pervious Concrete Pavements

Mohammadsoroush Tafazzoli, Washington State University


Stormwater runoffs in urban areas are the primary cause of multiple environmental issues such as pollution of water bodies, reduction of groundwater recharge, and increase in the rivers’ water temperature. Each of these impacts has a wide range of environmental ripple effects. Runoffs can be effectively controlled by applying the best management practices. Pervious concrete pavements are one of the most effective tools for implementing these practices in urban stormwater management. Numerous environmental benefits of these pavements have caused them to be widely replaced with the conventional concrete. However, considering the relatively short history of these pavements, there are still common issues in their application. Additionally, further enhancement of pavement technology depends on resolving certain limitations through further research. This paper discusses the major common issues in design, construction, and maintenance of these pavements that can lower the permeability in the surface, lead to functional deterioration, decrease service life, and reduce the efficiency of pervious pavements as a system in collecting runoffs. Recommended policies to resolve each of the issues are provided. The paper also discusses different existing limitations such as low compression strength and resistance against freeze-thaw and suggests potentials for further research to enhance the permeability and durability of the pervious concrete pavements.

Learning Objectives.

This presentation discusses how to improve the functionality of pervious concrete pavements through design and maintenance and is expected to contribute to extending the knowledge about one of the most effective BMPs in controlling stormwater runoffs. The study also clarifies the significance of making enhancements in pervious concrete pavements technology to extend its service life.

The permittees will learn more about the impact of sedimentation of particles in the voids, clogging of the sublayer, and repeated iterations of water freeze and melt in the course of time on decreasing the permeability and infiltration/exfiltration rate of the pavement. The challenge of frost for the Washington area will be specifically explained.

The recommended research to enhance the functionality of pervious concrete pavements are listed in the following:

  1. The need for practical documented feedback data on the long-term performance of existing pavements in different types of design and various climatic regions to create a database for making comparisons and identifying the successful practices.
  2. A comprehensive study to find out the impacts of making changes in different design elements on sedimentation rate in the course of time.
  3. Developing more accurate and comprehensive guidelines and standards in the design, construction, inspection, and maintenance of pervious concrete pavements

Development of a New BMP: Sand Filter Sidewalk Vaults

Aimee Navickis-Brasch and Taylor Hoffman-Ballard, Osborn Consulting; Jake Saxon, Spokane County


Constructing best management practices (BMPs) at sites with space constraints creates a challenge for jurisdictions, particularly for retrofit or redevelopment projects that are located in established urban areas. A viable solution is to develop BMPs that can fit into these built areas, such as the sand filter sidewalk vault BMP. This BMP receives runoff from roadways through a curb inlet that discharges to a vault, installed under the sidewalk. Stormwater is treated as it infiltrates through the sand media and then treated stormwater discharges to a storm drain network or drywell. The goal of this presentation is to provide an overview of the BMP development process. The specific objectives of this paper include: 1) provide an overview of the new Sand Filter Sidewalk Vault BMP as well as background information on what motivated Spokane County to develop this new BMP; 2) summarize the results from column testing sand media including how the results were used to develop the new BMP design and maintenance guidance; and 3) provide an overview of the field monitoring portion of the study which focuses on demonstrating the treatment performance of the new BMP for removing TSS, dissolved metals, and oils.

Learning Objectives.
  • Provides permittees from both EWA and WWA an overview of the process for developing new BMPs as well as how an idea from the county was developed through research.
  • Test-site is located in EWA and field results will include consideration for cold climates
  • Presentation will include lessons learned for field monitoring and effectiveness studies
  • This study is being conducted in compliance with the Monitoring section of the NPDES MS4 permit

Plant Selection for Stormwater Management

Brandy Reynecke, Washington State Department of Ecology


Throughout Washington, stormwater managers implement Low Impact Development (LID) or Green Infrastructure (GI) practices to manage stormwater quality and quantity. These practices usually require the inclusion or preservation of plants, and provide a broad range of environmental, health, and economic benefits beyond stormwater management. Often, stormwater managers have trouble with plant survival and maintenance, especially in arid and semi-arid environments. Proper plant selection and installation are critical to the success of an LID or GI project, and will ultimately save money and prevent frustration. In this presentation, I will introduce basic plant ecology principals, plant terminology, and discuss some common stormwater vegetation misconceptions. I will present a couple of arid/semi-arid environment case studies that demonstrate some of the “do’s’ and ‘don’ts” of including vegetation in stormwater projects. I will also share a plant selection tool used in California and invite the audience to discuss the idea of developing a similar tool for Washington.

Learning Objectives.

Municipalities often include LID practices in their stormwater management plans and projects. This presentation will discuss basic plant ecology principals and terminology, examine a couple of case studies, and discuss the use of a plant selection aid.


Assessment Protocol for Determining Rain Garden and Bioretention Facility Effectiveness

Robert Simmons, Washington State University


Rain gardens and bioretention facilities are considered to be effective tools in the Low Impact Development (LID) toolbox and are being implemented at an accelerating rate. Project partners, WSU Extension, Stewardship Partners and the City of Puyallup have developed a rain garden and bioretention assessment protocol that builds our region’s capacity to monitor basic functions of rain gardens and bioretention facilities and assess factors influencing their success and failure at a regional scale. The protocol was developed to allow ease of implementation, repeatability across large geographic scales and multiple implementers, and provide data of scientific and adaptive management value. The key questions that this project answers are:

  • What attributes of rain garden/bioretention functionality measured by volunteers and staff through visual observations and simple field or lab tests correlate best predict functional success of the system?
  • What design, construction, and maintenance actions identifiable by volunteers and staff have the greatest correlation with functional success of a rain garden/bioretention facility?

Through an extensive literature search and two rounds of pilot studies in 4 Puget Sound counties, our team of academics, permittees, and on-the-ground experts with extensive experience in measuring rain garden/bioretention function have developed effectiveness metrics as a framework for the evaluation of rain garden/bioretention effectiveness. This framework also provides insight into how installation methods and maintenance practices predict functional success of bioretention/rain garden success. The targeted effectiveness metrics include soil characteristics, infiltration capacity, bypass/overflow frequency, plant viability, public acceptance, maintenance issues, and whether or not the installation is still collecting runoff.

This presentation will provide an overview of the metrics, data methodology, challenges and successes, how jurisdictions can access and adapt the protocol for their use, protocol limitations, and an overview of the results using the protocol on 41 sites in the Puget Sound region.

This replicable, streamlined monitoring protocol will enable NPDES permittees to monitor progress consistently, economically and effectively. It will also be a useful tool to compare and share data between municipalities allowing for region-wide evaluation of progress as well as foster collaborative approaches to shared obstacles.

Learning Objectives.

This presentation will provide an overview of a useful tool that enables permittees to assess the functional success of rain garden and bioretention facilities. The participants will learn how to access the protocol, protocol limitations, and long term utility of the data for asset management, facility design, and investment. It will enable permittees to validate the effectiveness of installed facilities.

Track 3: Stormwater Planning and Retrofits

Port Townsend Stormwater Management Plan

Paul Fendt, Parametrix; Samantha Harper, City of Port Townsend


The City of Port Townsend developed a comprehensive stormwater management plan to address management of their existing system and plot a course for the future of the system. The City has a legacy of lots and road rights-of-way that were platted and developed over 100 years ago, with a mismatched drainage system, steep slopes, and discontinuous areas of good, infiltrating soils. The plan is developing four key elements in a coordinated plan: 1) a plan to define and connect the discontinuous drainage system with physical improvements and protections of natural system elements; 2) defined design and detail improvements for the predominant roadside ditch drainage system; 3) capital projects to resolve existing drainage problems; and 4) an approach and guidance for single lot developers to address site infiltration, where feasible, and connect to the newly defined drainage network.

Phase 2 NPDES communities will be tasked with preparing similar plans in the next permit. As each watershed and community is different, seeing and understanding different approaches will assist the Phase II municipalities with scoping their plans.

The plan features several innovative approaches: basin-specific land use evaluations to develop protection strategies; basin impact threshold evaluations to consider different land use thresholds; and measures to address legacy platted lots that are now being constructed.

One challenge in the plan was evaluating potential impacts to existing receiving waters, which are sparse or non-existent in this western Washington community due to the Olympic Mountain rain shadow effect. Annual rainfall (about 17 inches) is half of the total just 20 miles away to the south. The rainfall and runoff rates are more like Spokane, WA than the westside communities of the Cascades, therefore some of the findings are applicable across the state.

Learning Objectives.
  • How will this benefit permittees in Eastern and/or Western Washington? Basin planning is a key requirement in the new permit. Approaches and methods to select, evaluate, select, and plan for future development will assist the municipal permit holders.
  • What tools will permittees take away from this presentation? Methods for evaluating the “maximum extent practicable” infiltration on individual lots.
  • Does this presentation identify specific challenges and/or lessors learned? Yes. Basin planning with poorly defined, indistinct, or artificial drainage patterns is a unique challenge in developing communities.
  • How will this presentation improve efficiency of municipal permit compliance? Permit-holders will understand the “state of the practice” and reduce expectations and concerns about compliance.

Bonney Lake Watershed Protection and Land Use Planning

Paul Fendt, Parametrix; Jason Sullivan, City of Bonney Lake


The City of Bonney Lake, located in a rapidly growing part of Pierce County in the Puyallup River basin, prepared an integrated approach to watershed protection and land use planning. The purpose of the plan is to protect Fennel Creek and other receiving waters in the City. The objectives of the plan includes:

  • Land use plans and development regulations that are compatible with watershed protection targets established in this analysis
  • Regional and sub-regional stormwater control facilities
  • Retrofitting and neighborhood redevelopment plans identified as indicated by the needs and prioritization process
  • Basin-specific stormwater development standards, including infill, redevelopment, new site development, and water quality retrofits
  • LID feasibility assessments
  • Solutions to existing flooding problems

This effort provides a unique opportunity for the City to apply this approach to land use and comprehensive planning for its water resources. Much of the City is in the Fennel Creek basin; therefore, the City has nearly complete control over development, redevelopment, and land use decisions.

The City also prepared plans to develop, infill, and redevelop “Centers” where land use and infrastructure planning are identified and shaped in a planning process conducted in parallel with the watershed plan.

The Watershed Protection Plan features several innovative approaches: basin-specific water resource protection standards; regional stormwater facilities for new development and redevelopment; and developing a suite of measures to minimize impacts and correct existing problems. Current land use planning efforts include updating the City’s Critical Area Regulations, Landscaping Code, and Zoning Code updates informed by the Watershed Protection Plan.

One challenge in the plan was finding and prioritizing basin stormwater retrofitting. The highest priority basins are fully built out with available vacant land, and the plan findings show that the basin is in a protection mode, not a restoration mode, which reduces the motivation to implement substantial capital projects to address retrofitting.

Phase 2 NPDES communities will be tasked with preparing similar plans in the next permit. As each watershed and community is different, seeing and understanding different approaches will assist the Phase II municipalities with scoping their plans. The process for adoption as an Ecology-approved basin plan with area-specific control standards is underway.

Learning Objectives.

Briefly describe the expected outcomes and learning objectives of your presentation including:

  • How will this benefit permittees in Eastern and/or Western Washington? This plan closely follows emerging guidance for the permit basin planning requirement and can provide an approach and template for Phase II communities.
  • What tools will permittees take away from this presentation? Approaches for assessing watershed characteristics via hydrology.
  • Does this presentation identify specific challenges and/or lessors learned? Yes, such as unique basin characteristics and development pressure.
  • How will this presentation improve efficiency of municipal permit compliance?Provides an approach and template for the watershed planning requirement

Swale on Yale: P3 Regional Impact

David Schwartz, KPFF Consulting Engineers


The objective of this project is to provide water quality enhancement for a, roughly 450 acre, portion of urban runoff from the Capitol Hill area of Seattle. Prior to the construction of the swales the runoff was discharged directly to Lake Union untreated. Stormwater runoff from the streets of upper Capitol Hill, which is a densely developed urban area, transports silts, oils, heavy metals and other pollutants from the streets to the stormwater collection system and into Lake Union. This project has significantly improved the water quality and removed a large portion of the pollutants, improving the long term environmental health of the Lake. Another significant part of the project was the City of Seattle entering into a public/private partnership providing sufficient space along the frontage to make the project a success. This project is half complete with the second half under construction, when completed, the swales will treat approximately 500 million gallons of stormwater runoff annually.


The project approach diverted low flows out of the current storm drainage system into the treatment system that includes a swirl separator and the swales. The project starts with a flow diversion structure which backs stormwater up using a weir to divert water towards the treatment system. Higher flows during storm events will overflow the weir and continue down the existing piped conveyance system. The diverted lower flows pass through a swirl separator to remove large sediments and floatables prior to continuing toward the swales.

Flow splitting devises are used to divide the flows from the swirl separator into the 4 individual swales. Each of the flow splitting structures has an emergency overflow to prevent excessive amounts of water flowing into the swale and to provide for maintenance of the swales. The maximum flow that the swales are intended to treat is 7.23 cubic feet per second or roughly 3240 gallons per minute during the peak flows. The different swales vary in width and length according to the space available on each block. The flow splitters are designed to divide the water so that each swale has a minimum residence time of nine minutes in a flow through condition.

Summary of Methodologies & Funding.

As noted in the previous sections the project was developed as a public/private partnership between the City of Seattle Public Utilities (SPU) department and the private developer Vulcan Inc. This partnership was critical to the success of the overall project.

The total cost of this project is approximately $10 million. SPU received a $1 million stormwater grant from the Washington State Department of Ecology’s FY2011 Stormwater Retrofit and LID Competitive Grant Program and a $1.8 million loan from the Washington State Water Pollution Control Revolving Fund Loan Program.

SPU worked with City Developers., in developing and funding the Capitol Hill Water Quality project. Vulcan Inc. provided technical and professional support and is funding $1.3 million of the overall costs, as well as dedicated a 1-foot wide sidewalk easement on private property to the City along each frontage of their development to the City so that sufficient space was available to construct the swales and still provide pedestrian walkways in the right of way. The terms of the partnership between the City of Seattle and Vulcan Inc. were spelled out in a Memorandum of Agreement that each party signed. The remaining funding was raised through issuance of bonds that were federally secured.

Learning Objectives.

This project can act as a starting point for other Cities and Counties to provide regional facilities of this type for water quality enhancement. This is also a good example of the private public partnership that can aid jurisdictions in accomplishing similar projects.

  • Does this presentation identify specific challenges and/or lessors learned? Yes
  • How will this presentation improve efficiency of municipal permit compliance? The ability to provide high level water quality enhancement for large systems that are currently untreated gives agencies a different tool to meet discharge goals for water quality.

Our Green Duwamish Watershed Stormwater Strategy

Todd Hunsdorfer, King County; Carly Greyell


In September 2014, King County, in partnership with the City of Seattle, launched the Our Green/Duwamish initiative to develop strategies to strengthen communities and improve air, land, and water conditions in the Green/Duwamish Watershed. With over 40 representatives from environmental groups, community-based organizations, business leaders, urban planners, public health organizations, regulatory agencies, tribes, and elected officials, this initiative intended to increase coordination of current work in the watershed at the local, state, and federal levels to better manage habitat restoration, salmon recovery, flood control, stormwater management, public health, social equity, environmental cleanups, economic development, open space preservation, water quality and more.

The outcome from this phase was a Preliminary Background Report that identified regional comprehensive stormwater management as a key to improving the health of the watershed. In 2016, a collective of stormwater experts in the watershed convened to develop a strategy for the regional management of stormwater.

This watershed based stormwater management effort has now entered the implementation phase. King County is facilitating a group of stakeholders discussing the functional processes needed to make decisions, define participation, and assess priorities for stormwater management in the watershed.

This presentation seeks to share the methods used for developing this collaborative body, discuss several of the goals and objectives identified by the stakeholder group, and highlight a mapping tool that can be used for implementing the watershed-wide stormwater management strategy, as well as assisting with Phase II NPDES permit compliance. This mapping tool is completely scalable, capable of being used to inform decision making, and measure progress at a regional or local level.

Regulatory requirements have been evolving over the last two NPDES permit cycles to include more elements focused on watershed based planning. This presentation is designed to share how Our Green Duwamish is facilitating partnerships, exploring innovative approaches to stormwater management, and enabling coordination across the landscape.

Learning Objectives.

This presentation seeks to share the methods used for developing this collaborative body, discuss several of the goals and objectives identified by the stakeholder group, and highlight a mapping tool that can be used for implementing the watershed-wide stormwater management strategy, as well as assisting with Phase II NPDES permit compliance. This mapping tool is completely scalable, capable of being used to inform decision making, and measure progress at a regional or local level.

Regulatory requirements have been evolving over the last two NPDES permit cycles to include more elements focused on watershed based planning. This presentation is designed to share how Our Green Duwamish is facilitating partnerships, exploring innovative approaches to stormwater management, and enabling coordination across the landscape.


Kitsap County Stormwater Management Action Plan

Brian Ward, HDR; Angela Gallardo, Kitsap County


The Kitsap County Public Works Stormwater Division is charged with administering the County’s Western Washington Phase II Municipal Stormwater Permit. The intent of the Permit is to require stormwater management agencies to implement various stormwater Best Management Practices throughout their jurisdiction to improve water quality conditions in receiving waters. The 2019 Permit has expanded requirements in Section S5, Special Conditions for Stormwater Management Program for Cities, Towns, and Counties, that include provisions requiring comprehensive stormwater planning.

We will develop a Stormwater Management Action Plan (SMAP) in accordance with Ecology’s draft Stormwater Management Action Planning Guidance which guides permittees on selecting the highest priority drainage basin for implementing management action plans for improving water quality conditions in receiving waters (details about the SMAP process are described below).

Developing the SMAP (Track 2) is a three-step process that provides the framework for collectively addressing impacts to receiving waters.

Step 1: Conduct a Receiving Water Assessment (RWA) that determines the influence and relative contribution of the Permittee’s jurisdictional area on the receiving water. For Phase II counties, like Kitsap County, the Urbanized Areas and designated Urban Growth Areas are required to be included in this step. The outcome of RWA is a list of stormwater basins to be prioritized in Step 2.

Step 2: Basin Prioritization. Basins identified in step 1 will be prioritized based on the water quality conditions in the respective receiving waters. Receiving waters conditions will be assessed by identifying the beneficial uses and desired water quality conditions in each and the highest priority will be given to basins with:

  • Low to moderate levels of impairment,
  • Where municipalities can exert a greater influence on land management decisions and project implementation decisions.
  • Where regional rehabilitation efforts are also focused and
  • Where stormwater is directly discharged to Puget Sound convergence zones.

The result is a Watershed Inventory that organizes data into a common format for further analysis.

Step 3: Develop a SMAP for the highest priority basin. The action plan will be based on protection and restoration goals, along with a list of retrofit facilities to be implemented in both the short-term (< 6 years) and the long-term (7-20 years) periods. Strategically, SMAP addresses existing problems, and lays out a plan to meet future population and density targets while protecting resources.

The draft 2019 NPDES permit expands the role of comprehensive stormwater planning as a tool for protecting and restoring receiving waters. To position the County for meeting the new planning requirements, an evaluation of County policies, codes, and intra-agency coordination opportunities to identify how stormwater management needs and the need to protect and restore receiving waters is included in the County’s overall planning processes.

Learning Objectives.

The presentation will highlight an approach for completing the new permit condition for comprehensive planning including the preparation of a Stormwater Management Action Plan. Tools that will be highlighted are methods for including past planning efforts in the SMAP and criteria for conducting receiving water assessments. Attendees will be introduced to the project approach and issues/problems encountered and resolutions developed.

Track 4: Investigations & Mapping, Inspections and Review

Implementing a Surface Water Infrastructure Inspection and Asset Management Program

Theresa Thurlow, City of Federal Way

The original abstract was submitted with the City of SeaTac’s asset management program as the case study. With the change in presenter, the case study will be primarily City of Federal Way with highlights of other regional asset management programs and their challenges.


The City of SeaTac, Washington was incorporated in 1990. When it incorporated, the City inherited the public surface water infrastructure that was operated and maintained by King County. The City continued developing commercial and residential infrastructure increasing connections to the existing surface water system. The City did not have an accurate assessment of the surface water infrastructure to guide and schedule repair and replacement of this utility and was taking a reactive stance—waiting for surface water system failure. This exposed the City to inherent risks such as property damage, flooding, erosion, and personal injuries. Surface water program changes were necessary to address these needs.

In 2013, the City revised its Surface Water Plan and adopted a proactive approach to managing their assets. The City developed an asset management program and integrated it into Utility work practices with the goal of conducting an inventory of its surface water system. The goal of the asset management program was to evaluate rank and schedule needed surface water system repairs and replacement, prior to asset failure minimizing the risk of property damage, flooding and personal injuries resulting from failures.

The City’s goals for the asset management program were to:

  1. Conduct an inventory of at least 12 percent of the City’s surface water system each year, beginning in 2016, using video inspection equipment.
  2. Adopt and maintain an asset management program to provide cost effective level of service to City residents and property owners.
  3. Preemptively identify segments of the system that need maintenance and take action before asset deterioration causes flooding, erosion, and sedimentation.

It’s now 2019 and the plan has been in place for several years. Has the City achieved its goals? This presentation will provide an overview of the Surface Water asset management program and address:

  • How the assets are inspected, ranked and assigned for repair or replacement.
  • The risks and liabilities of the asset management program.
  • Successes of the program.
  • Lessons Learned.
Learning Objectives.

This presentation will be of interest for those contemplating an inspection program to improve their understanding of the surface water infrastructure network.

The presentation will describe the cameras, software, and other equipment necessary to implement an inspection program.

The presentation addresses how the City overcame challenges of scheduling, traffic control, cleaning and creating work orders for repair and maintenance.

Permittees will gain a better understanding of how to find buried, hidden and disruptive elements of their surface water infrastructure that may affect their compliance with the permit.


Roadside Ditch Inventory, Inspection, and Maintenance Recommendations

Rebecca Dugopolski, Herrera; Doug Navetski, King County


Roadside ditch maintenance is often an overlooked and underfunded aspect of a stormwater management program. King County was awarded a National Estuary Program grant from the Washington State Department of Ecology to evaluate roadside ditches and correlate their condition with appropriate maintenance and/or retrofit strategies. The overall project goal is to maximize the potential of roadside ditches to help manage the flow and quality of stormwater.

The first step in the project was to conduct a literature review to identify ditch maintenance practices, the impact of these practices on flow control and water quality, and prioritization strategies for adopting these practices. A total of 39 local and national ditch maintenance resources were reviewed. Most of the resources reviewed did not link ditch classification and/or condition with specific maintenance and remediation needs. Limited information was found in the literature review on prioritizing ditches for maintenance. Due to the limited information found in the literature review, the project team relied on the County Roads crews and the regional road maintenance group (ROADMAP) to provide input throughout the development of project deliverables.

A desktop assessment and field evaluation of 21 ditches in King County was also conducted. The information gathered from the desktop assessment and field evaluation, along with the literature review, was used to develop content for a ditch maintenance matrix, a ditch maintenance field guide, and a set of fact sheets.

The ditch maintenance matrix is a set of four tables that focuses on routine and corrective maintenance activities in standard ditch systems and ditch systems that have natural flow. The ditch maintenance matrix includes considerations and adjustments for different ditch surface types, flow conditions, steep slopes, and natural flow conditions.

The Field Guide for Roadside Ditch Maintenance is intended to be used by field staff and provides a user-friendly set of recommendations for each of the routine and corrective maintenance activities identified as part of this project. The Field Guide can be used as a stand-alone document or can be integrated into an existing standard operating procedure (SOP) or operations and maintenance (O&M) manual.

The fact sheets cover topics that are of interest to office-based staff and/or field crews:

  • Ditch mapping recommendations
  • Prioritizing ditches for inspection and maintenance
  • Permit requirements for ditch maintenance
  • Ditch source control strategies
  • Ditch retrofit strategies
  • Considerations for field evaluation of roadside ditches
  • Ditch cleaning strategies
  • Adjusting ditch maintenance activities when natural flow is present

Although the project focused on Western Washington, this topic and the project deliverables may also be of interest to the Eastern Washington permittees. The project deliverables are provided for guidance on ditch inventories, inspections, and maintenance, but can be modified by jurisdictions prior to implementation as needed.

Learning Objectives.

The presentation is intended to introduce attendees to guidance on roadside ditch inventories, inspections, and maintenance that was developed by King County and vetted by the ROADMAP regional road maintenance group. Attendees (Phase I and Phase II permittees from Western and Eastern Washington, secondary permittees, and WSDOT staff) can incorporate guidance and recommendations from the project deliverables into their own inventory, inspection, and maintenance programs. The project deliverables are intended to support a wide range of permittees and can improve the efficiency of municipal permit compliance.


Programmatic Approaches to Ensuring Long-term Performance of Post-Construction Stormwater Controls

Jeremiah Lehman, CONTECH


If stormwater treatment systems are working, they will need periodic maintenance. Many municipal stormwater programs are focused on review and approval of new stormwater control measures (SCMs) but lack the resources required to ensure adequate ongoing inspection and maintenance. Although most permittees require submittal of an inspection and maintenance plan for post-construction stormwater management systems as part of the plan review and approval process, these plans tend to get buried in a mountain of project-related paperwork. Without clear communication and enforcement of operation and maintenance (O&M) responsibilities, SCMs are likely to provide only a small fraction of their intended benefits over the life of an installation. This performance gap is especially wide where ownership of properties changes hands shortly after the development is complete. This presentation highlights best practices from stormwater programs around the country that ensure that SCMs are properly constructed and adequately maintained.

To aid in the successful structuring of NPDES permit language regarding O&M, federal guidelines such as the EPA’s 2010 MS4 Permit Improvement Guide are examined. These documents provide permit writers with suggested language to satisfactorily structure NPDES permits with enforceable O&M requirements, while allowing local variation for unique water quality issues and in response to local stakeholder input, whether maintenance of the SCM is performed by the permittee or the site owner/operator. Specific language is provided to structure legally binding maintenance agreements which allow the permittee to perform necessary maintenance or corrective actions neglected by the property owner/operator, and bill or recoup costs when they have not performed the necessary maintenance. Other examples provide guidance for tracking SCM installations within a jurisdiction, ideally in a format that is integrated into a GIS, as well as inspection, reporting and enforcement strategies to ensure compliance with the design intent of the initial stormwater plan.

Actual permit and ordinance examples are reviewed, demonstrating existing means by which permittees implement maintenance requirements of their SCMs and associated infrastructure. These include:

  • Los Angeles Region, maintenance inspection and recording requirements that are passed on to owner/operators when the property changes hands.
  • Washington State Phase I, requiring spot-checking of SCMs after a 10-year 24-hour storm or larger to identify and correct damage from extreme events.
  • City of Carlsbad, California, where municipal code contains explicit details regarding the permittee’s right to inspect stormwater facilities including performing tests, taking photographs and reviewing records.

Additionally, examples of successful maintenance agreements, as-built verification strategies, and local program enforcement approaches are discussed, showing elements that can be universally applied for O&M accountability, which will assist NPDES permit holders in ensuring lasting performance from their SCM infrastructure.

Learning Objectives.

While design, sizing, and selection of post-construction stormwater control measures are common elements of NPDES permits and local stormwater manuals, the long-term performance of these systems depends on well-structured operation and maintenance requirements. This presentation examines some of the challenges involved with tracking, inspecting, and enforcing maintenance needs on both private and public facilities, as well as providing real-life examples of successful permit language, ordinance structures, and enforcement strategies that address these challenges. Permit holders will be able to adapt and use these examples in their own jurisdictions, improving stormwater control function over the lifespan of each installation under their authority.


Case Study: Compliance Success for Private Facility Inspection and Maintenance

Laura Frolich and Jody Lind, Snohomish County


With a population exceeding 800,000 residents, Snohomish County is the 3rd most populated county in Washington State. As a Phase I Municipal Permittee, SWM has implemented a successful, effective and efficient Operations and Maintenance program for over 20 years. The program has evolved to address challenges such as rapid increases in the number and types of facilities, digitizing work processes using an asset management database and updating codes and policies to meet regulatory requirements. The program encompasses 1,970 stormwater facilities, spread out over 6,000 square miles. Our dedicated efforts have led to outstanding compliance rates of over 90% each year for commercial entities.

SWM O&M program focuses on customer service, communication, and education. Through direct and personal interactions with the commercial property owners, we’ve increased awareness and established mutual respect. The inspector’s visit each facility annually and work collaboratively to ensure timely and accurate maintenance. Once work is complete, inspectors validate right away, to demonstrate to the owner that their efforts are important to us. Although it can be time intensive, excellent customer service is a worthy investment because it creates a deeper understanding and appreciation for stormwater systems, which leads to better compliance outcomes.

It is our standard to provide customized resources to facility owners because we have learned the value of clear and personal communication. Tailored letters and corresponding site maps are critical communication tools because they allow the public to visualize an underground system, ensures the right components are addressed and enables a vendor to provide accurate quotes. Friendly postcards remind owners that we remain committed to their progress. In addition, our educational brochures have a detachable, prepaid response cards that encourage notification of completed work. Intentional communications are effective tools that outline expectations and generate compliance.

Online resources help the public understand their O&M responsibilities and the County’s expectations of them. For example, our Drainage Facility Maintenance Guide depicts the county maintenance standards with appealing graphics and lay term explanations. Our interactive web map shows the countywide drainage inventory and NPDES required data layers. A current stormwater services vendor lists, shows the array of professionals available for hire, which supports owners in maintaining their systems.

Our presentation includes the essential components of a successful private facility inspection program and effective methods of ensuring compliance. It highlights the resources most utilized by the public, outreach materials that streamline communication, and tips on prioritization when developing or enhancing a program. Permittees will see examples of how personal communication, direct customer service, and excellent resources build better relationships with facilities owners and generate positive outcomes.

Learning Objectives.

Our presentation will teach Permittees in Eastern and/or Western Washington the essential components of a successful private facility inspection program and effective methods of ensuring compliance from commercial facilities.

Permittees will get exposure to the resources most utilized by the public, outreach materials that streamline communication, and tips on prioritization when developing or enhancing a program.

This presentation focuses on the challenges of compliance using customer service, communication, and education which leads to facility owners gain a deeper understanding and appreciation for stormwater systems, which leads to better compliance outcomes long term.

Permittees will see examples of how personal communication, direct customer service, and excellent resources build better relationships with commercial facilities owners and generate excellent compliance outcomes.


Municipal Construction Stormwater Site Inspection Toolkit

Rebecca Dugopolski, Herrera; Amy Georgeson, City of Tumwater


What should an inspector be inspecting and tracking during a construction stormwater site inspection? Are inspectors inspecting and tracking the same items in neighboring jurisdictions? The City of Tumwater applied for and was awarded a Grant of Regional or Statewide Significance from the Washington State Department of Ecology (Ecology) to address these questions by developing a set of construction stormwater site inspection checklists. The primary goal was to assist municipal inspectors with more effectively tracking compliance with the municipal stormwater National Pollutant Discharge Elimination System permit. The City of Tumwater worked with a regional group that included the City of Lacey, City of Olympia, and Thurston County to develop the checklists.

The project team developed a total of five checklists:

  • Initial Erosion and Sediment Control (ESC) Inspection
  • Construction ESC Inspection
  • Post-Construction ESC Inspection
  • Construction of Permanent Stormwater Best Management Practices (BMPs)/Facilities Inspection
  • Post-Construction of Permanent Stormwater BMPs/Facilities Inspection

The first step in the project was to conduct a survey of current construction inspection practices in Western and Eastern Washington. A total of 45 responses were received from 13 counties including 40 responses from Phase II permittees, three responses from Phase I permittees, and two unspecified responses. Currently, more than 50 percent of the survey respondents use jurisdiction-specific construction stormwater site inspection forms and 11 percent reported used Ecology’s construction stormwater site inspection form. The remaining respondents (34 percent) reported using proprietary software and handwritten notes. Approximately 27% of the respondents currently track their inspections electronically and 73% of the respondents would like to track their inspections electronically in the future.

Development of the checklists involved reviewing the jurisdiction-specific checklists that were readily available online, provided as part of the survey, and provided by jurisdictions participating in the regional group. Two working group meetings were held with the City of Tumwater, City of Lacey, City of Olympia, and Thurston County representatives to review and comment on the proposed checklist content and to review the draft checklists.

A series of trainings were held in the fall of 2018 and the spring of 2019 to introduce the municipal construction stormwater inspection toolkit (checklists and fact sheets) and to highlight critical items for municipal stormwater site plan reviewers, municipal ESC inspectors, and municipal engineers to consider.

Although the checklists and training materials were developed in Western Washington with input from Western Washington permittees, this topic and the project deliverables may also be of interest to the Eastern Washington permittees. An implementation factsheet specific to Eastern Washington permittees was developed as one of the project deliverables. The checklists are provided as guidance for consistent tracking of construction stormwater site inspections, but can be modified by jurisdictions prior to implementation as needed.

Learning Objectives.

The presentation is intended to introduce attendees to a set of construction stormwater site inspections that was developed by the City of Tumwater and vetted by a regional group including the City of Lacey, the City of Olympia, and Thurston County. Attendees (Phase I and Phase II permittees from Western and Eastern Washington, secondary permittees, and WSDOT staff) can incorporate guidance and recommendations from the project deliverables into their own inspection programs. The project deliverables are intended to support a wide range of permittees and can improve the efficiency of municipal permit compliance.


Conference Concludes