Stormwater Management Using State Revolving Funds

Using SRF Loans for Stormwater BMP Improvements Vicki M. Putala, P.E. Environmental and Water Resources Director ohm-advisors.com 888.522.6711

Presentation Overview • Value of Stormwater BMPs • Common Types of Stormwater BMPs • Example Nonpoint Source SRF Projects • Allens Creek Pioneer High School • Auburn Hills City Retrofit • Auburn Hills Galloway Creek • Maintenance Considerations • Funding Stormwater BMPs • Tips for Moving Forward

EPA’s Definition of a Stormwater BMP A BMP is a technique, process, activity or structure used to reduce the pollutant content of a stormwater discharge. BMPs include structural modifications, such as the installation of bioretention. BMPs are most effective when used in combination with each other, and customized to meet specific needs. BMPs may also include simple nonstructural methods, such as good housekeeping and preventive maintenance.

Value of Stormwater BMPs • Reduces nonpoint source pollution • Helps permittees comply with National Pollution Discharge Elimination System (NPDES) requirements • Helps Meet Total Maximum Daily Load (TMDL) Objectives in Streams • Improves Base Flow in Streams and Reduces Flashy Hydrology

Common Types of BMPs Vegetated Water Reuse Bioretention (aka rain gardens) Cisterns Bioswales Rain barrels Bioinfiltration trench Naturalized stormwater areas Porous Surfaces Planter boxes Porous pavers Porous asphalt Structural Porous concrete Underground detention Hydrodynamic separation (aka grit chamber)

Vegetated BMPs Bioretention/ Rain Garden Bioswale

Vegetated BMPs Planter Box

Underground Detention Structural BMPs Hydrodynamic Separation

Water Reuse BMPs Rain Barrel Cistern

Porous Surface BMPs Concrete Stone Pavers Asphalt Grass Pavers

Allens Creek Project Plan The project plan was originally submitted in 2008 •Fivesites were identified for stormwater BMPs •Three road reconstruction and two retrofits An amendment was submitted in 2009 •Seven sites were identified for stormwater BMPs •Five road reconstruction and two site retrofits

Allens Creek Project Plan 2009 SRF Project Location 2008 SRF Project Location Future Project Location

Example #1: Pioneer High School Contributing Area: 308 acres (Allens Creek watershed 3,360 acres) Location: City of Ann Arbor County Jurisdiction: Washtenaw County Water Resources Commissioner – Janis Bobrin Stakeholders: Washtenaw County, City of Ann Arbor, Ann Arbor Public Schools, Allens Creek Advisory Group & City residents

Example #1: Pioneer High School •Project Goal: Reduce total suspended solids, phosphorus and E.coli •Two large underground detention basins with infiltration – 256,000 cubic feet of storage – 10% of stored volume infiltrated •Hydrodynamic Separators (aka grit chambers)

Example #1: Pioneer High School • Design Complete • Bidding – Now • Construction 2009 – 2010

Example #2: City Retrofits Location: City of Auburn Hills Stakeholders: City of Auburn Hills and the Clinton River Watershed Council Project Oversight: Shawn Keenan – Stormwater Coordinator (City of Auburn Hills) BMP Types: Rain gardens, water reuse cisterns, planter boxes, vegetated filter strip, infiltration trench and bioswale

Example #2: City Retrofits Several site retrofit projects underway Retrofit Locations •Civic Center •Fire Station #3 •Riverside Park •Riverwoods Park Civic Center Construction (City Hall) •Fall 2009 Riverside Park

Example #2: City Retrofits – Civic Center (Field House) • Design Complete • Bidding – Now • Construction 2009 • BMPs – cistern, rain garden

Example #2: City Retrofits – Civic Center (City Hall) • Design Complete • Bidding – Now • Construction 2009 • BMPs – planter boxes, rain garden

Example #2: City Retrofits – Fire Station #3 • Design Complete • Construction 2009 • Bidding – Now • BMPs – rain garden

Example #2: City Retrofits – Riverside Park • Design Complete • Construction 2009 • Bidding – Now • BMPs – infiltration trench, vegetated filter strip

Example #2: City Retrofits – Riverwoods Park • Design Complete • Construction 2009 • Bidding – Now • BMPs – bioswale and rain garden

Example #3: Galloway Creek Location: City of Auburn Hills Stakeholders: City of Auburn Hills and the Clinton River Watershed Council Project Oversight: Shawn Keenan – Stormwater Coordinator (City of Auburn Hills) BMP Types: Streambank stabilization, vegetative buffer and naturalized stormwater detention areas

Example #3: Galloway Creek • Design Complete • Bidding – Now • Construction 2009/2010 • BMPs – vegetative buffer, naturalized stormwater areas

Maintenance Considerations Bioretention/Rain Gardens – Biannual weeding – Refresh plantings (if necessary) Porous concrete/asphalt – Annual vacuum sweeping Underground Detention/Hydrodynamic Separation – Annual inspection and vactoring

Funding Stormwater BMPs Allens Creek Drainage District is made up of three entities: City of Ann Arbor, MDOT and Washtenaw County. The City’s share of the loan is paid from an existing stormwater utility fee. City of Auburn Hills will pay back the loan through their General Fund.

Tips for Moving Forward Find partners and build a team – Local schools – Watershed groups – Neighborhood groups – Local businesses and /or developers Determine opportune locations within your community – Make use of all spatial data (GIS data) – Consider upcoming capital improvements projects or redevelopment Identify regional alternatives or site specific – Consider large scale or suites of BMPs

Tips for Moving Forward Gentle/Flat Slopes for Porous Pavement – Should be less than 5% Low/moderate Traffic Volumes – Porous surfaces work best on low volume roads and/or parking areas Infiltrating Soils – Preferably NRCS hydrologic groups A, B or C – When poor soils exist (group D) soil amendments and underdrains may be necessary Salt and Sand Usage – Vegetated BMPs must be planted with salt torrent species when receiving road runoff – Sand usage is discouraged on porous roadways due to increased potential for void space clogging

Tips for Moving Forward Eligibility Criteria – Must meet goals identified in a state approved watershed management plan (CMI or 319) – Must achieve nonpoint source pollution reduction Public Involvement SRF application through Project Plan (due annually by July 1st) – Project Plan can identify proposed and future projects – Work with MDEQ early in planning phase especially in determining project eligibility – Project Plan must quantify pollution reduction and resulting cost- benefit analysis is helpful in prioritizing projects

Questions? Vicki M. Putala, P.E. vicki.putala@ohm-advisors.com 734-466-4479 Orchard, Hiltz & McCliment, Inc 34000 Plymouth Road Livonia, MI 48150 www.ohm-advisors.com 888-522-6711

Stormwater Management Using State Revolving Funds

by OHM Advancing Communities on Mar 15, 2010

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