Programs for Communities & Residents

Programs for Communities & Residents

DuPage County Stormwater Management

Monday, May 18, 2015

Rob Swanson, Water Quality Supervisor

DuPage County’s Regional Programs

• Water Quality Improvement Program

• Green Infrastructure Program

• Illicit Discharge Detection and Elimination Program

• Education and Outreach Program

• Watershed Plan Development Program

Lower Salt Creek Watershed

• Tributary to the DesPlaines River

• Measures 65.7 square miles (42,043 acres)

• Receives stormwater discharge from sixteen communities, as well as unincorporated areas• Addison, Bloomingdale, Clarendon Hills, Downers Grove, Elk

Grove Village, Elmhurst, Hinsdale, Itasca, Lombard, Oak Brook, Oakbrook Terrace, Roselle, Schaumburg, Villa Park, Westmont, and Wood Dale

• Includes seven major tributaries• Devon Avenue Tributary, Spring Brook, Westwood Creek,

Sugar Creek, Oak Brook Tributary, Ginger Creek, and Bronswood Tributary

Lower Salt Creek Watershed

NPDES Permit No. ILR40

• Authorizes the discharge of stormwater from small municipal separate storm sewer systems (MS4s) to waters of the State

• Permittee must develop, implement, and enforce a stormwater management program designed to reduce the discharge of pollutants from their small MS4 to the maximum extent practicable

• The stormwater management program must address six minimum control measures

Minimum Control Measures

1. Public education and outreach on stormwater impacts;

2. Public involvement/participation;

3. Illicit discharge detection and elimination;

4. Construction site stormwater runoff control;

5. Post-construction stormwater management in new development and redevelopment; and

6. Pollution prevention/good housekeeping for municipal operations

Post-Construction BMPs

• Requires that a permittee:

• Develop and implement a strategies that will include a combination of structural and/or non-structural BMPs appropriate for all projects within its community for all new development and redevelopment that will reduce the discharge of pollutants, the volume and velocity of storm water flow to the maximum extent practicable

• Adopt strategies that incorporate storm water infiltration, reuse and evapotranspiration of storm water into projects to the maximum extent practicable

Water Quality Improvement Program• Streambank stabilization program initiated in 1993

• Paid for conceptual design and up to 20% of construction costs

• Stormwater Management received several requests to participate in projects where the goal was to improve water quality, but streambank stabilization was not necessarily the desired solution

• Grants for “green infrastructure” projects began to be given out in 2000

• Reimbursed for up to 20% of design, permitting, construction, and maintenance and monitoring costs

Water Quality Grant Priorities

• Water quality (45% of score)

• Reduces pollutant on §303(d) list or point/non-point source pollutant loadings

• Improves in-stream habitat or restores pre-development hydrology

• Wetland and riparian areas (25% of score)

• Rehabilitates wetlands, riparian habitat, or buffers

• Education (10% of score)

• Conveys project goals to community leaders, developers, consultants, and the general public

Water Quality Grant Priorities

• Readiness to proceed (10% of score)

• Project has completed design, permitting and funding

• Regional benefits (5% of score)

• Involvement of multiple stakeholders

• Facilitating others in community to undertake similar projects

• Funding dedication (5% of score)

• Stated dedicated sources of funding

• Stewardship designation (5% of score)

• Plan for long-term maintenance of the project

WQIP Grant Recipients

• Village of Villa Park Police Department Green Roof Project (2003)

• Included green roof, bioswale, and permeable pavers

• Oakwood Homeowners Association Lake Charles Shoreline Stabilization Project (2003/2004/2005)

• Included planting of submergent, emergent, and shoreline plants to stabilize portions of the banks of Lake Charles


• Walnut Oaks Homeowners Association Spring Brook Remediation Project (2005)

• Included meander of 1,455 linear feet of eroded channel and creation of riparian wetland

• Brook Forest Community Association Ginger Creek StreambankStabilization Project (2005)

• Included meander of 800 linear feet of eroded channel and creation of a riparian buffer zone


• Addison Public Library Green Roof Project (2007)

• Included a 5,300 square foot green roof installation

• Elmhurst College Permeable Paver Parking Lot Project (2007)

• Included a two acre permeable parking lot, as well as bioswales, native landscaping, rain gardens, and cisterns


• City of Oakbrook Terrace Spring Road Tributary StreambankStabilization Project (2007)

• Included streambankstabilization, storm sewer outfall enhancement, and landscape restoration utilizing native grasses and shrubs

• Bloomingdale Township Natural Habitat Restoration Project (2009)

• Included a 3.5 acre natural habitat restoration to restore degraded wetland and riparian areas within the Spring Brook watershed


• Village of Villa Park S. Monterey Avenue Bioswale Project (2014)

• Included installation of eighteen rain gardens

• City of Elmhurst Addison Avenue Permeable Paver Project (2014)

• Included the retrofit of Addison Avenue between First and Second Streets through conversion of angled parking with permeable, parallel parking and a bike lane

Green Infrastructure Program

• Structural BMPs that reduce the discharge of pollutants and the volume and velocity of storm water flow commonly referred to as “green infrastructure”

• Defined in ILR40: Wet weather management approaches and technologies that utilize, enhance or mimic the natural hydrologic cycle processes of infiltration, evapotranspiration and reuse. Green infrastructure approaches currently in use include green roofs, trees and tree boxes, rain gardens, vegetated swales, pocket wetlands, infiltration planters, porous and permeable pavement, porous piping systems, dry wells, vegetated median strips, reforestation/ re-vegetation, rain barrels and cisterns and protection and enhancement of riparian buffers and floodplains.


• Identify communities with a need and desire to utilize green infrastructure to control stormwater runoff locally;

• Explore design options for green infrastructure that will reduce the volume of stormwater discharging to the combined sewer system; and

• Implement the recommended structural practices within the community











IDDE- When to Sample

• No earlier than 72 hours after rain event

• Rain event = greater than 0.1 inch of rain

• Check USGS precipitation gage closest to monitoring sites

• Nine gage stations with real-time precipitation data

IDDE- How to Sample

•Testing for six parameters:• pH (Standard Units)

• Temperature (°C)

• Specific Conductance (uS/cm)

• Fluoride (mg/L)

• Ammonia (mg/L)

• Detergents / Anionic Surfactants (mg/L)

IDDE- Where to Sample

• ILR40 authorizes storm water discharges to any surface water of the State

• IEPA utilizes the US Geological Survey’s National Hydrography Dataset (NHD 1:100,000 scale) for the §303(d) impaired waters list

• NHD identifies approximately 252.5 rivermiles within DuPage County’s borders

Future of the IDDE Program• Reissued ILR40 general permit expected to become

effective in the next few months• Requires shared responsibilities for implementing a

minimum control measure defined by a written agreement

• Pursue new IGA with interested municipalities

• Various Best Management Practices outlined in DuPage County’s Notice of Intent (NOI)• Collect and compile storm sewer maps from partnering

municipalities into an atlas

• Perform visual screening of a particular percentage of known MS4 outfalls per year

• Conduct chemical monitoring on a particular percentage of discharging outfalls per year








Education and Outreach Program• Printed brochures

• Social media

• Electronic newsletters

• Technical seminars

• Representation at community events

• Public Service Announcements (PSAs)

• Tours of facilities

• Contracts with TCF and SCARCE

Watershed Plan Development Program

• Identify flood control and water quality projects on a watershed basis

• Help Dupage County and municipalities to secure federal and state grants

• Illinois EPA’s Section 319(h) Nonpoint Source Pollution Control Financial Assistance Program• Designed to provide grant funds for projects that prevent,

eliminate, or reduce water quality impairments caused by Non-Point Source (NPS) pollution

• Projects that implement components of an approved Watershed-Based Plan will receive priority for funding

Why Protect Waterways?• The Clean Water Act set a national goal “to restore

and maintain the chemical, physical, and biological integrity of the Nation’s waters”• Interim goals that all waters be fishable and swimmable, where

possible

• Projects focusing on water quality typically:• Capture or assimilate pollutant loads• Reduce water volume through infiltration or evapotranspiration• Improve aquatic conditions for fish and the insects that fish eat

Nine Minimum Elements

1. Develop information and education component

2. Identify causes of impairments for the waterway

3. Describe management measures needed

4. Estimate pollutant load reductions expected

5. Determine technical and financial assistance needed

6. Create schedule for implementing management measures

7. Describe interim measureable milestones

8. Establish criteria used to determine whether load reductions are being achieved

9. Monitor to evaluate the effectiveness of implementation

Questions?

DuPage County Stormwater Management

630.407.6700

[email protected]

www.dupageco.org/swm

www.facebook.com/lovebluedupage

www.twitter.com/lovebluedupage

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