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Home My WebLink AboutStormwater Infrastructure PP Supplemental City of MedinaStormwaterInfrastructure march 28, 2022 Stormwater History Historically drainage of property was implemented to remove stormwater and shallow groundwater from property in order to FARM, Develop cities and construct road networks. Purpose of stormwater management Water quality Salmon Recovery Flood control Stormwater related issues Downstream flooding Erosion Filling of shipping channels Pollution of drinking water supplies Habitat damage Loss of recreation Oils and grease Heavy metals Nutrients Bacteria Fine sediment Temperature increase Flashy hydrologic response DIRTY UBIQUITOUS DIFFUSE VARIABLE NO ONE WANTS IT Regulation And compliance Clean Water Act of 1972 – NPDES permit Nationwide Pollutant Discharge Elimination System Phase II State & Local regulations for development Standard of Practice for conveyance design Development of runoff models What does the city currently have? 1985 paper Maps 1992 Comprehensive Stormwater Plan 2010 GIS Base map with handheld GPS INCOMPLETE & INACCURATE Field Investigation General maintenance issues Neglect Punctures, separation, corrosion Concrete pipe Damage Stress cracks, broken joint Roots, rocks, dirt, concrete Poor Construction Inadequate cover Improper bedding Poor materials Custom, mystery connections General Findings Lots of older, small diameter pipes Variety of inlets, catch basins, frames, & grates Structures hidden by landscaping Few treatment systems Few flow control facilities localized flooding issues What needs to be done? Update map using GIS-based platform Asset Essentials tool: Tracking maintenance activities NPDES tracking Inventory NPDES Compliance Identify problems Find all system components Maintenance schedule Update the map yearly Sustainable funding source Continue investigation and condition assessments Develop maintenance schedules per NPDES Develop long term capital improvements current Inventory approx. $16M ASSETS LENGTH LF 12-inch or smaller 39,331 15- to 21-inch 3,841 24-inch 2,746 30-inch 44 36-inch 948 48-inch 84 60-inch 99 Unknown Pipes 5,749 Swales/Ditches 11,130 Catch Basins 1,012 Outfalls 24 Culverts 9 of various sizes Conclusions Old system 50 Years of Deferred Maintenance Problems New NPDES Regulations Looking ahead Enhanced Maintenance Program Capital Improvement Program Additional NPDES Requirements Funding Maintenance Program Proactive vs. Reactive More Frequent/Detailed Inspections Expose & Mark Facilities Pipe Jetting & TV Inspection Catch Basin Cleaning & Adjustment Minor Repairs Record Keeping Administration vs. Field Work Cleanup Easements Additional NPDES Requirements Administration (Ryan plus Consultants) Field Operations (Contractors) Routine Permit Tasks: Annual Report Tracking of Activities & Costs Long Range Planning LID Code Implementation & Updates Public Education, Outreach, & Involvement Mapping Updates IDDE Investigations, Tracking, & Reporting Development Review, Inspection, Documentation O&M Training & Recordkeeping Source Control Program Monitoring & Assessment NEW - SMAP (Retrofits – Capital Projects, added O&M Costs) Funding options REET, currently $150k yr but takes from other capital projects Grants – Yes, however unreliable / unsustainable Require developers to update frontage system or pay into improvement plan Stormwater utility with annual fee Questions as we go, open discussion format. In Medina, the storm and sewer were originally a combine system. The sewer was moved into its own system which is currently owned by the City of Bellevue. a lot of Medinas storm infrastructure is part of the old combined system. This is not all bad……but it shows the age of the storm system Water quality and salmon recovery has been the focus for Ecology and the corp of engineers since they deal with the local tribes. Infrastructure bill allocated $1B for culvert removal or replacement for fish passage. Flood is a significant threat to people and property, our storm system is in place to reduce those risks. development “improvements” cause issues with impervious surfaces Over the course of time, the management of runoff has evolved from a strictly engineering task to a mix of engineering, political, and regulatory tasksThe Clean Water Act (CWA) establishes the basic structure for regulating discharges of pollutants into the waters of the United States and regulating quality standards for surface waters. The basis of the CWA was enacted in 1948 and was called the Federal Water Pollution Control Act, but the Act was significantly reorganized and expanded in 1972. "Clean Water Act" became the Act's common name with amendments in 1972. Under the CWA, EPA has implemented pollution control programs such as setting wastewater standards for industry. EPA has also developed national water quality criteria recommendations for pollutants in surface waters. The CWA made it unlawful to discharge any pollutant from a point source into navigable waters, unless a permit was obtained: EPA's National Pollutant Discharge Elimination System (NPDES) permit program controls discharges. Point sources are discrete conveyances such as pipes or man-made ditches. Individual homes that are connected to a municipal system, use a septic system, or do not have a surface discharge do not need a NPDES permit; Industrial, municipal, and other facilities must obtain permits if their discharges go directly to surface waters. I should rephrase this, we WERE incomplete and inaccurate. Roger and the G&O Team have done a tremendous amount of research and foot work to develop an updated storm inventory and maps. Responding and resolving to runoff problems is an analytical task; and knowing your system is key to success I don’t want to scare but these are real issues that we need to address Its hard not to laugh, but what happened here?? Basically, what we found was an older drainage collection and conveyance system that may need replacement and upgrades to address new standards, new regulations, and changes in Medina Now that you have an idea of the extent of the issues that the city is and will be dealing with, how to we get a handle on it? Inventory performed by G&O as of 2021 Regular maintenance and capital improvements Our stormwater permit compliance is ongoing and continues to increase in scope. For example the LID code updates from 2019 which took a lot of resources to update. Staff, council and consultants. $70k+ in cost. Another good example is the ongoing Private Inspection program. We hit 50% in 2020 and only hit 25% in 2021. to be compliant we need to hit 80% every year. (explain efforts) CM & Finance Director