1. It’s only a raindrop, what is there to worry about !
Presentation 5 Outline
Implementing Construction/Post-Construction Do’s
and Don’ts
Terms and Concepts
Permit Comparison
Review of What is Required
How Do I Know What to Use Where or When?
- Key Selection Decision Points
Storm Water Pollution Prevention Plan- Do’s and Don’ts
Questions and Answers
It’s only a raindrop, what is there to worry about !
Session 5 Implementing Construction/Post-Construction Do's and Don'ts

2. Terms and Concepts We Need to Know
Municipal Separate Storm Sewer System (MS4) Permit
BMP- Best Management Practices.
MCM-Minimum Control Measures
MEP- Maximum Extent Practical
Phase II regulated areas – Area regulated by OEPA requiring Storm Water Management Plans (SWMP) and Best Management Practices.
Construction Storm Water Permit
SWP3- Storm Water Pollution Prevention Plan
NOI-Notice of Intent
WQV – Water Quality Volume
WQV = C*P*(A/2)
C = Run-off coefficient
P = 0.75” Precipitation Depth
A= Area draining into BMP (acres)
Session 5 Implementing Construction/Post-Construction Do's and Don'ts

3. Permit Comparison
Municipal Separate Storm Sewer System (MS4)- Phase II Permit
Compared With
Construction General Permit (CGP)
What does the Construction General Permit mean to MS4’s?
Becomes process for construction and post- construction MS4 permit.

4. Permit Comparison – What is Required
MS4
Construction Activities over 1- Acre
Erosion and Sediment – Ordinance, regulations
Develop measurable goals
Construction operator requirements.
Structural and Non-Structural BMP’s
BMP Appropriateness Assessment
CGP
Construction Threshold Acreages:
- 1 to 5 acres- Flexible
- Over 5 acres- Prescriptive
SWP3- Required
Only Structural BMP’s identified in permit.
Non-Structural BMP’s not allowed under CGP
Notice of Intent (NOI) to be submitted
Statewide Permit
2008 Renewal date

5. Permit Comparison – When is it Required
MS4
For Construction Activities over 1- Acre
For new or redevelopment projects
For compliance w/ Construction and Post-Construction Minimum Control Measures.
CGP
For Construction activities over 1 Acre:
- 1 to 5 acres
- Over 5 acres
For new or redevelopment projects
To address Construction and Post – Construction site storm water run-off.

6. Permit Comparison – How will they be Implemented
MS4
Develop sub-division regulations, ordinances.
Develop Site plan review checklist
Develop inspection and training program
Review current Erosion and Sediment control requirements.
CGP
Develop erosion and sedimentation control plan
Develop SWP3 plans
New and re-development projects.
Through Developer, contractor and third parties.

7. How do I know what BMP to use where or when?
Do’s and Don’ts when deciding on Post-Construction Structural BMP’s:
Do:
Review OEPA permit
Seek professional advice or guidance from regulators
Talk to your neighbors
Ask how much will it cost and what is the level of maintenance.
Do Not:
Just call out 1 of the 8 mentioned in the permit.
Ignore maintenance
Be afraid to ask for assistance
What did I do to deserve this?

8. Structural Post Construction BMP’s
Vegetated filter strips and swale
Functional Background
Treats storm water through the interaction of vegetation and removal of suspended solids.
Can be used exclusively or used as pretreatment to additional BMPs.
Swale area
Polaris Parkway, Westerville, Ohio – Ohio Department of Transportation

9. Structural Post Construction BMP’s
Infiltration BMP’s
Background
Treat storm water through a filtering substrate (sand, gavel, or soil).
Discharges into the ground water.
Requires the correct soils and geology to ensure success.
Basin Infiltration Area
Caltrans
ODNR
Infiltration trench area

10. Structural Post Construction BMP’s
Extended detention basin (Dry Basin)
Detention Area
Background
Capture and release the WQv slowly over 48 hours (requires an outlet control structure).
Requires overflow spillway for larger than design storm events.
Two methods are available:
Above ground – Preferred method when feasible.
Below ground – Useful in urban situations.
Ohio Department of Natural Resources

11. Structural Post Construction BMP’s
Retention basin (Wet Basin)
Retention Area
Background
Capture and releasing 75% of the WQv slowly over 24 hours (requires an outlet control structure).
Provides permanent storage for 75% of the WQv.
The full storage depth ranges from 3-6 feet (volume must be less than 15 Ac-ft).
Requires overflow spillway for larger than design storm events.
Ohio Department of Natural Resources

12. Structural Post Construction BMP’s
Bio-retention
Background
Treats storm water via a special planting soil.
Uses an underlying perforated underdrain or storm sewer as an outlet.
Native plant material such as trees, shrubs, and grasses give the appearance of normal landscaping.
Designed to store 75% of the WQv prior to filtration.
Total filtration should occur within 40 hours.
Bio retention area
Warren Co. SWCD

13. Structural Post Construction BMP’s
Constructed Wetland
Background
Treats storm water through bio-retention interaction.
Defined as a depressed heavily planted area that is designed to maintain a dry weather flow depth ranging from 0.5 to 2 feet.
Detain and release WQv between 24 hours. Requires the use of an outlet control structure.
Constructed Wetland
Ohio Department of Transportation

14. Post-Construction BMP Maintenance Summary
Structural BMP Type
Anticipated level of Maintenance
Low
Medium
High
Vegetated Swales/Filter Strips X
Infiltration
Extended Detention - Dry
Retention Basin- Wet
Constructed Wetland
Bio filtration

15. Review of Post- Construction Requirements
Post-Construction Requirements w/in Construction General Permit
Requirements/Objectives
Maintain Stream Functions.
Protect Stream Chemical, Physical and Biological Characteristics.
Provide perpetual management of Runoff quality and quantity
BMP-Maintenance Plan
Storm Water Pollution Prevention Plans (SWP3)
Anticipated Impact Rationale to include;
Quantity = Flow
Channels
Floodplain
Morphology
Hydrology
Water Quality
2 Different Permits
Construction Site Storm Water Permit- Effective April 21, 2003.
Transportation 2006
Municipal Separate Storm Sewer System (MS4)- Permit- Effective March 10, 2003.
Post-Construction Minimum Control Measure

16. Storm Water Pollution Plans- SWP3- Do’s and Don’ts
Submit NOI to OEPA w/ fee
Develop SWP3 and keep on site
Understand who is responsible- Developer and Contractor
Recognize benefit of sequencing
Obtain a copy of OEPA’s SWP3 Checklist
Learn from others
Develop internal plan review checklist for SWP3 elements.
Due engage an engineer as necessary
Due understand level of maintenance associated with each BMP selected.

17. Storm Water Pollution Plans- SWP3- Do’s and Don’ts
SWP3 Don’ts:
Forget to account for off site drainage
Forget to perform weekly and ½” rainfall site inspections
Forget to document inspections
Forget to include Sediment and erosion control plan
Forget to develop maintenance plan for each BMP selected or designed.
Forget need to evaluate and assess Post-Construction- accessibility will be key

18. Local /ODOT road projects
Local road project- Follow local requirements for post-construction controls.
ODOT – Project incorporate ODOT post-Construction policy

19. Post Construction BMP FAQ’s
Are post-construction BMP’s required on projects from 1-5 acres?
Yes, requirements more flexible
What types of BMP’s are required?
Local requirements- MS4, TMDL, etc.
OEPA not specific requirements, recommend
Limiting impervious areas
Reduce impervious connectivity\
Preserve buffers around streams/wetlands

20. Post Construction BMP FAQ’s
Are any projects exempt from Post-Construction BMP’s:
Yes, Linear projects which do not create impervious surfaces.
Redevelopment projects less stringent
Public transportation projects 3 year extension –March Must still comply with Sediment and erosion control component of this permit.- NOI and sediment and erosion control plan required.

21. SWP3 and Post Construction Summary
Storm Water Pollution Prevention Plans
BMP’s to implement- construction and post
Detailed maintenance plan
Detailed site plan: description, run-off calculations
Location of BMP’s
Sediment and erosion control plan
Supporting narratives in general notes or on plan, copy of permit
BMP installation/construction sequence
Control of non-sediment pollutant plan
Completed NOI/ with $200 fee
BMP-installation specifications
Post-construction BMP’s
Authorized signature

22. Reference Resources
Urban Runoff Quality Management – ASCE, WEF Manual of practice no. 23, ASCE Manual and report on engineering practice no. 87.
Websites
OEPA-
ODNR-
FHWA -
ODOT - www. dot.state.oh.us/stormwater/
NEMO -

23. We need to better understand the power of the raindrop!
Presentation 5 Review
Implementing Construction/Post-Construction Do’s and Don’ts:
Terms and Concepts
Permit Comparison
Review of what is required
How do I Know What to Use Where or When?
- Key selection decision points
Storm Water Pollution Prevention Plan- Do’s and Don’ts
Questions and Answers
We need to better understand the power of the raindrop!
Session 5 Implementing Construction/Post-Construction Do's and Don'ts

24. Questions and Answers
I think the presentation will end here. We can use the next few slides if they ask us questions about them
This slide should suggest “URS” any ideas??
Session 5 Implementing Construction/Post-Construction Do's and Don'ts

25. Session 6 – Good Housekeeping/Pollution Prevention Basics and Tools
End of Session 5
Session 6 – Good Housekeeping/Pollution Prevention Basics and Tools