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It’s only a raindrop, what is there to worry about !

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Presentation on theme: "It’s only a raindrop, what is there to worry about !"— Presentation transcript:

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-www.epa.state.oh.us/dsw/storm/index.html 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


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