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"We've got to do what now?" Webinar

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Webinar hosted by New Jersey Future and the New Jersey Builders Association on May 28, 2020

Published in: Government & Nonprofit
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"We've got to do what now?" Webinar

  1. 1. Helping developers navigate the new green infrastructure rules We’ve got to do what now? Architect: Marchetto Higgins Stieve Photographer: Don Pearse
  2. 2. Poll Time
  3. 3. AGENDA • Key changes to NJDEP’s Stormwater Rules (NJAC 7:8) • How to use the Developers Green Infrastructure Guide 2.0 • Strategies for overcoming challenging site conditions with green infrastructure. • Extended Q&A
  4. 4. Send in your questions through the Q&A button on your control panel. What's the tough question about green infrastructure you wish someone would ask?
  5. 5. Architect: Marchetto Higgins Stieve Photographer: Don Pearse
  6. 6. Stormwater Management Rule Amendments Adopted 3-2-2020 Jim Murphy Bureau of Nonpoint Pollution Control Division of Water Quality New Jersey Department of Environmental Protection
  7. 7. Topics • Three Key Rule Changes • Interim Activities • BMP Updates • Training
  8. 8. Key Changes under the Rule Amendments • Definition Changes and Additions • Green Infrastructure • Major Development • Green Infrastructure Standard • Clarify Applicability of Water Quality Standard
  9. 9. Green Infrastructure Definition N.J.A.C. 7:8-1.2 Means a stormwater management measure that manages stormwater close to its source by: 1. Treating stormwater runoff through infiltration into subsoil; 2. Treating stormwater runoff through filtration by vegetation or soil; or 3. Storing stormwater runoff for reuse.
  10. 10. Definition Changes Under N.J.A.C. 7:8-1.2 • Added definition of “regulated motor vehicle surface” • Added definition of “regulated impervious surface” • Changed definition of major development • 1 acre or more of disturbance since 2/2/04; or • ¼ acre of regulated impervious surface since 2/2/04; or • ¼ acre of regulated motor vehicle surface since 3/2/21
  11. 11. Application of Water Quality Standard • “Old” Rule – Impervious Surfaces • New Rule - Motor Vehicle Surfaces • Rule text does not require roofs or sidewalks to be treated – consistent with current implementation • Included in Definition of Major Development
  12. 12. Green Infrastructure Standard N.J.A.C. 7:8-5.3 • GI BMPs must be used to satisfy recharge, quantity, and quality • 3 Tables identifying the performance of each BMP in meeting the standards • Table 5-1: Recharge, Quality, and Quantity Control • Table 5-2: Quantity Control (Recharge & Quantity w/Waiver or Variance) • Table 5-3: Recharge, Quality, and Quantity Control ONLY with Waiver or Variance • Maximum Contributory Drainage Area Limitations specified • Maintain existing ability to propose an alternative stormwater design. Alternative design must meet GI definition and must meet drainage area limitation if similar to BMP with limit.
  13. 13. Table 5-1: GI BMPs for recharge, quantity, and quality Best Management Practice Quality TSS removal rate (percent) Quantity Recharge Minimum separation from seasonal high water table (feet) Cisterns 0 Yes No - Dry Wells 0 No Yes 2 Grass Swales 50 or less No No 2 Green Roofs 0 Yes No - Manufactured Treatment Device (MTDs) 50 or 80 No No Dependent upon the device Pervious Paving Systems 80 Yes Yes No 2 1 Small-scale Bioretention Systems 80 or 90 Yes Yes No 2 1 Small-scale Infiltration Basins 80 Yes Yes 2 Small-scale Sand Filters 80 Yes Yes 2 Vegetative Filter Strips 60-80 No No - Drainage area limitation applies to: dry wells, MTDs, pervious paving system, and small-scale bioretention, infiltration, and sand filters. Table 1 only includes MTDs that meet the definition of GI
  14. 14. Best Management Practice Quality TSS removal rate (percent) Quantity Recharge Minimum separation from seasonal high water table (feet) Bioretention Systems 80 or 90 Yes Yes No 2 1 Infiltration Basins 80 Yes Yes 2 Sand Filter 80 Yes Yes 2 Standard Constructed Wetlands 90 Yes No N/A Wet Ponds 50-90 Yes No N/A Table 5-2: GI BMPs for quantity (recharge and quality only with waiver or variance) Wet ponds used under Table 2 must be designed to have native vegetation and a reuse component
  15. 15. Best Management Practice Quality TSS removal rate (percent) Quantity Recharge Minimum separation from seasonal high water table (feet) Blue Roofs 0 Yes No N/A Extended Detention Basins 40-60 Yes No 1 Manufactured Treatment Device 50 or 80 No No Dependent upon the device Sand Filters 80 Yes No 1 Subsurface Gravel Wetlands 90 No No 1 Wet ponds 50-90 Yes No N/A Table 5-3: BMPs that may only be used if a waiver or variance is granted
  16. 16. Under the New Rule… • Be Cognizant of Prior Disturbance • Consider the Date(s) in terms of Major Development Definition • Runoff Must be Treated Close to the Source • Motor Vehicle Surfaces • https://www.nj.gov/dep/rules/adoptions.html
  17. 17. Interim Activities • Amended Rules adopted: March 2, 2020 • Amended Rules operative: March 2, 2021 • Grandfathering provisions: see NJAC 7:8-1.6(b) • Municipal stormwater ordinances must be revised and in effect by March 3, 2021. • Updated model ordinance posted on DEP web page
  18. 18. NJ Best Management Practices Manual - Updates Comment Period Closed 5/1/20: • Chapter 5 – Stormwater Mgmt. Quantity and Quality Standards and Computations • Chapter 12 – Soil Testing Criteria Recently Posted Final Updates: • Chapter 13 – Groundwater Table Hydraulic Impact Assessments for Infiltration BMPs • Appendix D – Model Municipal Stormwater Ordinance
  19. 19. NJ Best Management Practices Manual - Updates Edits in Progress: • Chapter 3 – Munic. and Regional SW Mgmt Planning • Chapter 4 – Stormwater Pollutant Removal Criteria • Chapter 9 – GI BMPs • Chapter 10 – GI BMPs with Waiver • Chapter 11 – Non-GI BMPs BMP Manual: https://www.njstormwater.org/bmp_manual2.htm
  20. 20. NJDEP Training • Design Reviewer Training • 2-days, re-scheduled for July • Fall Training – impacts of adopted Rule • Training website: https://www.njstormwater.org/training.htm
  21. 21. Thank you! Jim Murphy Stormwater Management Unit Bureau of Nonpoint Pollution Control Division of Water Quality James.Murphy@dep.nj.gov 609-633-7021
  22. 22. Send in your questions through the Q&A button on your control panel. What's the tough question about green infrastructure you wish someone would ask?
  23. 23. What is the purpose of the guide?
  24. 24. What is the purpose of the guide? • To help developers understand and navigate the new rule adoption as well as upcoming changes to the companion BMP Manual
  25. 25. What is the purpose of the guide? • To help developers understand and navigate the new rule adoption as well as upcoming changes to the companion BMP Manual • Illustrate how the new rule is a positive change from the current status quo
  26. 26. What is the purpose of the guide? • To help developers understand and navigate the new rule adoption as well as upcoming changes to the companion BMP Manual • Illustrate how the new rule is a positive change from the current status quo • Highlight common practices which have been removed and benefits to be gained
  27. 27. What Is In and What Is Out? IN: Decentralized green infrastructure OUT: Gray and exclusively “End of Pipe” stormwater basins BENEFIT: More efficient systems with potential for greater project yield
  28. 28. What Is In and What Is Out? IN: Infiltration “Counts” OUT: Redundancy in engineering calculations BENEFIT: Smaller more accurately sized systems save on construction costs and increase developable area
  29. 29. What Is In and What Is Out? IN: Objective mathematical standards OUT: Subjective review criteria BENEFIT: Predictable and efficient permitting and approval process “Maximum Extent Practicable”
  30. 30. There are Eight Chapters in the Guide • NJ Stormwater Rules and Requirements • Types of Green Infrastructure • Pre-Rule Change Vs. Post- Rule Change Side-By-Sides • Addressing Challenges, Solving Problems • Case Studies – Industrial, Mixed Use, Multi-Family, Healthcare • Benefits of Green Infrastructure • Frequently Asked Questions • Resource List
  31. 31. Kemble Park Bioswale Image Credit: E&LP Associates
  32. 32. Shoemaker Green Image Credit: Andropogon Associates
  33. 33. Molly Dodd Anderson Library Image Credit: Viridian Landscape Studio
  34. 34. Ed Confair, PE, PLA Senior Program Manager, Resiliency E&LP Associates econfair@elp-inc.com 215-330-4113 Ext. 311
  35. 35. Common/Perceived GI Challenges • Limited room • Shallow seasonal high water table • Poor soils • Urban redevelopment • Brownfields • No receiving storm sewer or waterway
  36. 36. Limited Room
  37. 37. Limited Room
  38. 38. Shallow Groundwater/Poor Soils
  39. 39. Shallow Groundwater/Poor Soils
  40. 40. Shallow Groundwater/Poor Soils
  41. 41. Urban Redevelopment
  42. 42. Brownfields • Lined GI works: • Porous Pavement • Bioretention • Wet Ponds
  43. 43. Warehouse • Roof Recharge • Pervious Concrete • Perimeter Bioretention • Wet Ponds
  44. 44. Industrial PROJECT Fratelli Beretta Mount Olive, NJ CUPOLEX DESIGN Infiltration tank formed with CUPOLEX RIALTO®. STORAGE VOLUME 590m3 (21,000 cu.ft) PROJECT REFERENCES
  45. 45. Thank You!
  46. 46. Contact Us George Vallone President The Hoboken Brownstone Company 2015 President NJ Builders Association gvallone@hbrownstone.com James Murphy Supervising Environmental Engineer NJ Department of Environmental Protection James.Murphy@dep.nj.gov Edward Confair, PLA, PE Senior Program Manager, Resiliency E&LP Associates econfair@elp-inc.com Jeromie Lange, PE Senior Principal Maser Consulting jlange@maserconsulting.com Kandyce Perry Planning and Policy Manager New Jersey Future kperry@njfuture.org
  47. 47. NOW LIVE! CHECK IT OUT! NEW STORMWATER RULE. NEW GUIDANCE.
  48. 48. Extended Q&A 1:00-1:30 pm

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