Stormwater RunoffLet’s start with defining what is Stormwater Runoff?
Stormwater runoff is rain or snowmelt that flows over land and does not percolate/get absorbed into the soil.
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Stormwater Pollution
Managing the Environmental & Project Development Process
Primary Pollutants• Sediment• Heavy Metals• Oil & Grease• Solids• Salt
Sources• Brake dust, tire wear, fluids• Litter• Construction• Maintenance Activities• Atmospheric Deposition
Regulations• Federal Water Pollution Control Act
Clean Water Act
• National Environmental Policy Act (NEPA)
• ORC Chapter 6111 (Water Pollution Control) Ohio EPA National Pollutant
Discharge Elimination System (NPDES) Permits Construction General Permit
(CGP) Watershed Specific CGP 4Categorical Exclusion Training Class
Environmental Impacts• Construction Stormwater Impacts:
Stormwater runoff quality during construction
Stormwater runoff quality after construction
• Primary Commitments: Comply with Ohio EPA Construction
NPDES Permits Temporary sediment and erosion
controls during construction Post-construction stormwater
management controls after construction (permanent)
• Secondary Commitments: Local stormwater programs or
commitments
5Categorical Exclusion Training Class
Addressing Impacts
• Temporary sediment and erosion control during construction Supplemental Specification 832
ODOT Responses:
• Post-construction stormwater management controls (after construction - permanent) L&D Manual, Vol. 2 Drainage Design
6Categorical Exclusion Training Class
Addressing Impacts
ODOT BMP Toolbox• Vegetated Biofilter• Manufactured Systems • Extended Detention • Retention Basin• Infiltration Techniques • Bioretention Cell• Constructed Wetlands
Post-Construction Stormwater Management
• All post-construction BMPs require long term maintenance plan
7Categorical Exclusion Training Class
Environmental Impacts
• Only 1 question we need to answer…
Online CE:
8Categorical Exclusion Training Class
Environmental Impacts
• Does the project require coverage under the CGP? (Notice of Intent = NOI)
Question 1:
9Categorical Exclusion Training Class
Construction General Permit (NOI)
Question 1a:• Is the project new
construction/redevelopment or routine maintenance?New Construction / Redevelopment
• Construction with 1 acre or greater of earth disturbance activities
Routine Maintenance• Specific project types with less than 5
acres of earth disturbance activities
10Categorical Exclusion Training Class
Routine Maintenance Projects
What is Routine Maintenance?• ODOT L&D Manual, Vol. 2 Section
1112.2• Berm repair or topsoil placement along shoulder
• Bridge abutment repair• Bridge deck overlay• Bridge deck replacement• Chip sealing• Culvert repair/lining/some
replacement• Curb repairs• Ditch cleanout• Fence repair/replacement• Full depth pavement
repairs• Guardrail
installation/replacement
• Lighting maintenance
• Linear grading• Loop detector
repairs• Noise wall repair• Partial depth pavement
repairs• Pothole filling• Resurfacing• Sign repair/maintenance• Signal
installation/maintenance• Tree and brush removal• Sidewalk Replacement• Isolated Slide Repairs
If not listed, the project cannot be considered “routine maintenance”.
11Categorical Exclusion Training Class
Routine Maintenance Projects
What is Routine Maintenance?• ODOT L&D Manual, Vol. 2 Section
1112.2• Berm repair or topsoil placement along shoulder
• Bridge abutment repair• Bridge deck overlay• Bridge deck replacement• Chip sealing• Culvert repair/lining/some
replacement• Curb repairs• Ditch cleanout• Fence repair/replacement• Full depth pavement
repairs• Guardrail
installation/replacement
• Lighting maintenance
• Linear grading• Loop detector
repairs• Noise wall repair• Partial depth pavement
repairs• Pothole filling• Resurfacing• Sign repair/maintenance• Signal
installation/maintenance• Tree and brush removal• Sidewalk Replacement• Isolated Slide Repairs
Routine Maintenance does not equal “Maintenance Project”
12Categorical Exclusion Training Class
Environmental Impacts
• Is the project in a Watershed Specific CGP Area?
Question 1b:
13Categorical Exclusion Training Class
Environmental Impacts
• Not really a question, but remarks should clarify your assumptions…
Question 1c:
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Environmental Commitments
• What are the commitments?
Question 1d:
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Environmental Commitments
Example Commitments:• Commitment 1: Project will need Notice
of Intent submitted to EPA• Commitment 2: Project will need to
comply with CGP or watershed specific CGP
• Commitment 3: Project will address local stormwater issues• Commitments should be kept general at this point
• Only commit to what we know for sure16Categorical Exclusion Training Class