Presentation 5 Outline Implementing Construction/Post- Construction Dos and Donts Terms and Concepts...

Presentation 5 OutlinePresentation 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

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



It’s only a It’s only a raindrop, what is raindrop, what is

there to worry there to worry about !about !

Terms and Concepts We Need to KnowTerms 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.

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)

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)

Permit ComparisonPermit Comparison

Municipal Separate Storm Sewer System (MS4)- Phase II Permit

Compared With

Construction General Permit (CGP)

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.

Permit Comparison – What is Required

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

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

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

Permit Comparison – When is it Required

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.

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.

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.

Permit Comparison – How will they be Implemented

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.

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.

CGP Develop erosion and sedimentation control plan Develop SWP3 plans New and re-development projects. Through Developer, contractor and third parties.

How do I know what BMP to use where or when?

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

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?

Structural Post Construction BMP’sStructural Post Construction BMP’s

Vegetated filter strips and swale

Vegetated filter strips and swale

Polaris Parkway, Westerville, Ohio – Ohio Department of Transportation

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


Infiltration BMP’sInfiltration BMP’s

Caltrans

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.

Infiltration trench area

Basin Infiltration Area

ODNR


Extended detention basin (Dry Basin)

Extended detention basin (Dry Basin)

Ohio Department of Natural Resources

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.

Detention Area


Retention basin (Wet Basin)

Retention basin (Wet Basin)

Ohio Department of Natural Resources

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.

Retention Area


Bio-retention Bio-retention

Warren Co. SWCD

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


Constructed Wetland Constructed Wetland

Ohio Department of Transportation

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

Post-Construction BMP Maintenance Summary

Post-Construction BMP Maintenance Summary

Structural BMP Type Anticipated level of Maintenance

Low Medium High

Vegetated Swales/Filter Strips

X

Infiltration X

Extended Detention - Dry X

Retention Basin- Wet X

Constructed Wetland X

Bio filtration X

Review of Post- Construction Requirements

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

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

Storm Water Pollution Prevention Plans (SWP3)

Anticipated Impact Rationale to include;

• Quantity = Flow

• Channels

• Floodplain

• Morphology

• Hydrology

• Water Quality

Storm Water Pollution Plans- SWP3- Do’s and Don’ts


SWP3 Do’s: 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.

SWP3 Do’s: 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.



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

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

Local /ODOT road projectsLocal /ODOT road projects

Local road project- Follow local requirements for

post-construction controls.

ODOT – Project incorporate ODOT post-

Construction policy

Local road project- Follow local requirements for

post-construction controls.

ODOT – Project incorporate ODOT post-

Construction policy

Post Construction BMP FAQ’sPost 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

• 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

Post Construction BMP FAQ’sPost 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 2006- Must still comply with Sediment and erosion control component of this permit.- NOI and sediment and erosion control plan required.

• 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 2006- Must still comply with Sediment and erosion control component of this permit.- NOI and sediment and erosion control plan required.

SWP3 and Post Construction SummarySWP3 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

Reference ResourcesReference 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- www.dnr.state.oh.us/soilandwater/urbanstormwater.htmlwww.dnr.state.oh.us/soilandwater/urbanstormwater.html

FHWA - www.nhi.fhwa.dot.gov/download/catalog/135XXX.pdf

• ODOT - www. dot.state.oh.us/stormwater/

• NEMO - http://nemo.osu.edu/

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- www.dnr.state.oh.us/soilandwater/urbanstormwater.htmlwww.dnr.state.oh.us/soilandwater/urbanstormwater.html

FHWA - www.nhi.fhwa.dot.gov/download/catalog/135XXX.pdf

• ODOT - www. dot.state.oh.us/stormwater/

• NEMO - http://nemo.osu.edu/

Presentation 5 ReviewPresentation 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



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



We need to We need to better better

understand the understand the power of the power of the

raindrop!raindrop!

Questions and AnswersQuestions and Answers

End of Session 5End of Session 5

Session 6 – Good

Housekeeping/Pollution

Prevention Basics and Tools

Session 6 – Good

Housekeeping/Pollution

Prevention Basics and Tools

Presentation 5 Outline Implementing Construction/Post- Construction Dos and Donts Terms and Concepts...

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