1. Storm Water Management
NPDES STORMWATER
ECOLOGICAL AND PERMITS SECTION
Storm Water Management
WILLIAM R. CODY
Assistant Environmental Administrator
Managing the Environmental & Project Development Process

2. NPDES STORMWATER ODOT & The Environment Business Plan 2010-2011
Initiative 6: “Go with Green”
Use the best environmentally-sensitive practices in operations and pilot new green initiatives as ODOT leads by example in embracing environmental stewardship and reducing energy consumption.
ODOT’s “Green Team” to measure how department projects, maintenance and operations impact water and air quality, and to recommend ways to reduce negative impacts
Managing the Environmental & Project Development Process

3. Water Quality Regulations
NPDES STORMWATER
Water Quality Regulations
ODOT planning, construction, and maintenance activities must comply with:
Clean Water Act
Coastal Zone Management Act of 1972
Comprehensive Environmental Response, Compensation, and Liability Act of 1980
Department of Transportation Act, Section 4(f)
Fish and Wildlife Coordination Act
National Environmental Policy Act of 1969
Ohio Coastal Management Act of 1998
Ohio Revised Code Chapter 6111
Ohio Wild, Scenic, and Recreational River Act
Rivers and Harbors Act of 1899
Safe Drinking Water Act
Wild & Scenic Rivers Act, Section 7
Managing the Environmental & Project Development Process

4. Storm Water Pollution from Highway Runoff
NPDES STORMWATER
Storm Water Pollution from Highway Runoff
Primary Pollutants
Heavy Metals
Oil & Grease
Solids
Salt
Sources
Vehicle wear & tear (brake dust, tire wear, fluids)
Litter
Construction & maintenance activities
Atmospheric deposition
Managing the Environmental & Project Development Process

5. Storm Water Regulations
NPDES STORMWATER
Storm Water Regulations
Regulations
Clean Water Act permits
General Construction Permit (statewide)
Watershed Specific Permit(s)
Administered by Ohio EPA
For earth-disturbing construction activities > 1 acre
Primary requirements
Temporary sediment and erosion controls - during construction
Post construction storm water management controls - after construction (permanent)
Managing the Environmental & Project Development Process

6. Storm Water Regulations & ODOT Responses
NPDES STORMWATER
Storm Water Regulations & ODOT Responses
ODOT Responses
Storm Water Management Plan
Required for ODOT’s “MS4” storm water permit
Summarizes efforts to reduce the discharge of pollutants from ODOT’s storm sewer system
MS4 = Municipal Separate Strom Sewer
Managing the Environmental & Project Development Process

7. Storm Water Regulations & ODOT Responses
NPDES STORMWATER
Storm Water Regulations & ODOT Responses
ODOT Responses
Supplemental Specification 832
Temporary sediment and erosion control during construction
Location & Design Manual, Vol. 2 Drainage Design
Post construction storm water management controls (after construction - permanent)
Major update: January 18, 2008
Managing the Environmental & Project Development Process

8. Post Construction Storm Water Management
NPDES STORMWATER
Post Construction Storm Water Management
Required to treat:
Water Quality
Remove pollutants
Water Quantity
Slow down storm water’s path to a stream
Challenge:
Comply with permit requirements
Fit into linear project footprint
Limited ability to acquire right of way
Managing the Environmental & Project Development Process

9. Post Construction Storm Water Management
NPDES STORMWATER
Post Construction Storm Water Management
ODOT worked with Ohio EPA over the past five years
Results:
Alternative best management practices (BMPs) that are equivalent in effectiveness to those described in the Construction Storm Water General permit
ODOT’s BMPs incorporated by reference in draft permit
For public road transportation projects
BMPs are provided in the Location & Design Manual, Vol. 2 Drainage Design - January 18, 2008 update
BMP effectiveness must be researched by ODOT
Managing the Environmental & Project Development Process

10. Post Construction Storm Water Management
NPDES STORMWATER
Post Construction Storm Water Management
ODOT post construction storm water BMP toolbox:
Vegetated Biofilter
Exfiltration Trench
Manufactured Systems
Extended Detention
Retention Basin
Infiltration Techniques
Bioretention Cell
Constructed Wetlands
Managing the Environmental & Project Development Process

11. Post Construction Storm Water BMPs
NPDES STORMWATER
Post Construction Storm Water BMPs
Vegetated Biofilters
Vegetated portion of the graded shoulder
Vegetated slope
Vegetated ditch
Exfiltration Trenches
Captures roadway drainage at edge of shoulder through the use of a permeable concrete surface.
The “ExT” is placed 15 feet (min) prior to any drainage inlet, pavement catch basin or curb cut.
Catch basin
ExT
Research is on going for effectiveness of these BMPs.
Managing the Environmental & Project Development Process

12. Post Construction Storm Water BMPs
NPDES STORMWATER
Post Construction Storm Water BMPs
Manufactured Systems
Proprietary underground structure
Offline configuration with existing storm sewer
Removes particulate matter through settlement or other means
Note: There are many different types of manufactured systems from a variety of companies.
Managing the Environmental & Project Development Process

13. Post Construction Storm Water BMPs
NPDES STORMWATER
Post Construction Storm Water BMPs
Extended Detention
“Dry pond”
Captures storm water during rain events and slowly releases the entire captured volume over a period of time leaving a dry bottom
Retention Basins
“Wet pond”
Has a minimum water surface elevation between storms that is defined as the permanent pool.
Captures storm water during rain events and slowly releases the captured volume over a period of time.
Managing the Environmental & Project Development Process

14. Post Construction Storm Water BMPs
NPDES STORMWATER
Post Construction Storm Water BMPs
Infiltration Techniques
Storm water filters through substrate consisting of soil, sand, or gravel.
Discharges treated storm water into ground water rather than into surface waters.
Bioretention Cells
Depressed, low-lying areas that treat storm water through evapotranspiration and filtering.
Underlying perforated storm sewer or underdrain carries treated storm water to an outlet.
Extensive vegetation assists in the filtration of the storm water prior to filtering through the soil.
Constructed Wetlands
Treat storm water through bio-retention.
Designed in a similar manner as a retention basin.
Depressed, heavily planted areas designed to maintain a dry weather flow depth of 0.5 to 2 ft.
Managing the Environmental & Project Development Process

15. NPDES STORMWATER
Storm Water Associated with Construction Activity in the Big Darby Creek Watershed and Olentangy Watershed
Watershed Specific Permits includes:
New SWPPP regulations
Timing and Contents
Mitigation:
Stream Setbacks
Groundwater Recharge
Managing the Environmental & Project Development Process

16. NPDES STORMWATER
Storm Water Associated with Construction Activity in other specific watersheds:
OEPA has developed TMDL Reports for 56 impaired watersheds. In addition to the Big Darby, the following watersheds have TMDL requirements for developing a watershed specific Storm Water Construction Permit:
Chagrin River
Wakatomika Creek
Managing the Environmental & Project Development Process

17. NPDES STORMWATER Storm Water Construction Activity Permits
Consequences to ODOT:
Increased project footprint:
More environmental assessment and documentation:
Wider ditches, storm water ponds & wetlands
Structural additions; EXTs, manufactured systems, etc
Increased mitigation:
Stream restoration
Environmental covenants
On going Research
Managing the Environmental & Project Development Process

18. Assistant Environmental Administrator
NPDES STORMWATER
Questions ?
William Cody (614)
Assistant Environmental Administrator
Managing the Environmental & Project Development Process