The document discusses Ohio EPA's Construction General Permit and new bioretention standards. The Construction General Permit is revised every 5 years and requires erosion and sediment control at active construction sites, proper management of materials and waste, and post-construction runoff management to improve water quality and protect streams. The new bioretention standards provide specific design guidelines and allow bioretention areas to be used to treat the required water quality volume on construction sites. The standards were updated in October 2013 and can be found on the Ohio DNR website.

1. Construction Site Permitting and
New Bioretention Standards
Chris Cotton
Stormwater Program Coordinator
Ohio EPA – Southwest District Office
Christopher.cotton @ epa.ohio.gov
937.285.6442

2. OEPA’s Construction General PermitOEPA’s Construction General Permit
 Revised every 5 yearsRevised every 5 years
 ESC at active construction sites, andESC at active construction sites, and
 Proper mgmt of materials, wasteProper mgmt of materials, waste
 ““Post-construction” runoff mgmt toPost-construction” runoff mgmt to
 Improve water qualityImprove water quality
 Protect stream stability/functionProtect stream stability/function

3. Post-ConstructionPost-Construction & the& the
“Water Quality Volume”“Water Quality Volume” (p 18 of CGP)(p 18 of CGP)
WQv = C x P x A/12WQv = C x P x A/12 C = runoff coefficientC = runoff coefficient
P = 0.75 inches of rainP = 0.75 inches of rain
A = area draining to BMPA = area draining to BMP
-- BMPs listed in permit (p 21)-- BMPs listed in permit (p 21)
-- Alternative BMPs => OEPA approval

4. Bioretention as Post-con BMPBioretention as Post-con BMP
• Size to handle all (or part) of a siteSize to handle all (or part) of a site
•
• 24 hour draindown24 hour draindown
•
• Rain gardens not considered bioretentionRain gardens not considered bioretention
• Lack specific design standardsLack specific design standards
• Rain gardens typically smallRain gardens typically small
• Better suited for retrofitsBetter suited for retrofits

5. • Erosion/Sediment Control BMPsErosion/Sediment Control BMPs
• Post-con standards (Chapter 2)Post-con standards (Chapter 2)
• http://www.dnr.state.oh.us/tabid/9186/default/aspxhttp://www.dnr.state.oh.us/tabid/9186/default/aspx
Bioretention Standards Updated 10/13Bioretention Standards Updated 10/13

6. • Erosion/Sediment Control BMPsErosion/Sediment Control BMPs
• Post-con standards (Chapter 2)Post-con standards (Chapter 2)
• http://www.dnr.state.oh.us/tabid/9186/default/aspxhttp://www.dnr.state.oh.us/tabid/9186/default/aspx
Bioretention Standards Updated 10/13Bioretention Standards Updated 10/13