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 BMPs - Best Management Practices

It is important to properly install and maintain  erosion and sediment controls in order to comply with the Clean Water Act, state regulations, and county ordinances.

Silt Fences:

These silt fences have not been maintained, and can no longer effectively trap sediment.

Sediment Basins:

These sediment basins are full of sediment. They need to be cleaned out so they can continue to trap sediment.

Inlet Protection:

This inlet is not protected, and sediment can be discharged to lakes and streams.

Filter Berms:

This filter berm has not been properly installed. Water run off and sediment can still escape the construction site. 

Trackout Controls:

This site needs better trackout controls to prevent vehicles from carrying sediment off site.

 

For  more information on BMPs, see the Indiana Stormwater Quality Manual and visit the EPA's website

 A Few Tips

  • Seasonality

o  Maintenance measures should continue as needed throughout construction, including the over-winter period

o  After each rainfall, snowstorm or period of thawing and runoff, the site contractor should conduct an inspection of all installed erosion control measures and perform repairs as needed

  • If you don't have to disturb it, don't
  • Be proactive and keep in contact with the county
  • Bioretention areas need the proper soil mix, proper grading, outlet height and plant selection. It is best to hire a landscaper for this final part of the project.

o  Soil amendments require: 50% compost, 25% sand, 25% topsoil and a depth of soil at least 18 inches deep

o  Do not use soil with a high percentage of clay because water will not easily infiltrate 

Background

Clean Water Act (1972)

  • National Pollutant Discharge Elimination System (NPDES)

The National Pollutant Discharge Elimination System (NPDES) Stormwater Program regulates stormwater discharges from three potential sources: municipal separate storm sewer systems (MS4s), construction activities, and industrial activities. Most stormwater discharges are considered point sources, and operators of these sources may be required to receive an NPDES permit before they can discharge. This permitting mechanism is designed to prevent stormwater runoff from washing harmful pollutants into local surface waters such as streams, rivers, lakes or coastal waters.

Rule 5 – Stormwater run-off associated with construction activity

Rule 13 – Municipal Separate Storm Sewer System (MS4)

o   Minimum Control Measure (MCM) #4 - Construction Site Stormwater Runoff Control

o   An MS4 operator shall develop a Stormwater Quality Management Plan (SWQMP) that includes a commitment to develop, implement, manage, and enforce an erosion and sediment control program.

o Check out EPA's website for NPDES information.

 

Monroe County Ordinances

  • Chapter 816 – Erosion and Sediment Control (based on state Rule 5)
  • Chapter 761 – Stormwater Management (Drainage system design and maintenance)
  • Chapter 830 – Landscaping (Bioretention specs)
  • Chapter 829 – Karst and Sinkhole Development Standards

         See the Monroe County Code for these County Ordinances. 

SWPPP - Stormwater Pollution Prevention Plans

All construction projects with a land disturbance of one acre or more are required to file a Notice of Intent (NOI) to the Indiana Department of Environmental Management (IDEM). A Stormwater Pollution Prevention Plan (SWPPP) must also be developed and submitted with the NOI.

The purpose is to identify:

  • potential sources of stormwater pollution
  • practices to reduce pollutants and the volume of stormwater discharges
  • the person responsible for managing stormwater
  • each major phase of construction

The elements to be included in the SWPPP are:

  • construction company information
  • site map
  • potential pollutants
  • identification of receiving waters
  • BMPs for managing stormwater
  • employee training log
  • documentation of compliance - inspections, sampling, spill reports, etc.  

Further information on SWPPPs can be found on the EPA's website, as well as a guide for construction sites.

 

Please contact Dana Wilkinson at dwilkinson@co.monroe.in.us or 349-2960 if you have any questions or concerns 

 

 

 

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