NPDES STORMWATER Managing the Environmental & Project Development Process Storm Water Management WILLIAM R. CODY Assistant Environmental Administrator.

NPDES STORMWATER

Managing the Environmental & Project Development ProcessManaging the Environmental & Project Development Process

Storm Water Storm Water ManagementManagement

WILLIAM R. CODY Assistant Environmental Administrator

ECOLOGICAL AND PERMITS SECTION

NPDES STORMWATERNPDES STORMWATER


ODOT & The EnvironmentODOT & 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

http://www.dot.state.oh.us/policy/2010-2011BusinessPlan/Documents/ODOT2010-2011BusinessPlan-WEB.pdf



Water Quality RegulationsWater Quality RegulationsODOT 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



Storm Water Pollution from Highway RunoffStorm 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



Storm Water RegulationsStorm 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)



Storm Water Regulations & ODOT ResponsesStorm 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



ODOT Responses• Supplemental Specification 832

– Temporary sediment and erosion control during construction

Storm Water Regulations & ODOT ResponsesStorm Water Regulations & ODOT Responses

• Location & Design Manual, Vol. 2 Drainage Design– Post construction storm water management

controls (after construction - permanent)– Major update: January 18, 2008



Post Construction Storm Water ManagementPost 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

http://www.jaxshells.org/jul4026.htm



• 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

Post Construction Storm Water ManagementPost 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

Post Construction Storm Water ManagementPost Construction Storm Water Management



Vegetated Biofilters1. Vegetated portion of the

graded shoulder2. Vegetated slope3. Vegetated ditch

Post ConstructionPost Construction Storm Water BMPsStorm Water BMPs

1. Captures roadway drainage at edge of shoulder through the use of a permeable concrete surface.

2. The “ExT” is placed 15 feet (min) prior to any drainage inlet, pavement catch basin or curb cut.

Exfiltration Trenches

Research is on going for effectiveness of these BMPs.

ExTExT

Catch Catch basinbasin



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.




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.


http://www.jaxshells.org/jul4026.htm



Post ConstructionPost Construction Storm Water BMPsStorm Water BMPsInfiltration TechniquesInfiltration Techniques Storm water filters through substrate consisting of Storm water filters through substrate consisting of

soil, sand, or gravel. soil, sand, or gravel. Discharges treated storm water into ground water Discharges treated storm water into ground water

rather than into surface waters.rather than into surface waters.Bioretention CellsBioretention Cells Depressed, low-lying areas that treat storm water Depressed, low-lying areas that treat storm water

through evapotranspiration and filtering. through evapotranspiration and filtering. Underlying perforated storm sewer or underdrain Underlying perforated storm sewer or underdrain

carries treated storm water to an outlet. carries treated storm water to an outlet. Extensive vegetation assists in the filtration of the Extensive vegetation assists in the filtration of the

storm water prior to filtering through the soil.storm water prior to filtering through the soil.Constructed WetlandsConstructed Wetlands Treat storm water through bio-retention.Treat storm water through bio-retention. Designed in a similar manner as a retention basin. Designed in a similar manner as a retention basin. Depressed, heavily planted areas designed to Depressed, heavily planted areas designed to

maintain a dry weather flow depth of 0.5 to 2 ft.maintain a dry weather flow depth of 0.5 to 2 ft.



Storm Water Associated with Construction Storm Water Associated with Construction ActivityActivity in the Big Darby Creek Watershed and in the Big Darby Creek Watershed and Olentangy WatershedOlentangy Watershed

Watershed Specific Watershed Specific Permits includes:Permits includes:

Mitigation: Stream Setbacks Groundwater Recharge

New SWPPP regulations Timing and Contents



Storm Water Associated with Construction Storm Water Associated with Construction ActivityActivity in other specific watersheds: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



Consequences to ODOTConsequences to ODOT:Storm Water Construction Activity PermitsStorm Water Construction Activity Permits

• 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



Questions ?Questions ?

William Cody (614)466-5198William Cody (614)466-5198Assistant Environmental AdministratorAssistant Environmental Administrator

[email protected]

mailto:[email protected]

NPDES STORMWATER Managing the Environmental & Project Development Process Storm Water Management WILLIAM R. CODY Assistant Environmental Administrator.

Documents

npdes stormwater

odots ms4 storm water

construction permanent

environmental stewardship

operations impact water

harbors act

liability act

ohio coastal management