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NYSDEC Stormwater Permits TMDL Conditions and Retrofit Options. Shohreh Karimipour, P.E. MS4 Permit & TMDL. Designation of additional MS4s in TMDL watersheds 2003 - Extend past areas to boundaries of New York City drinking water watershed East of Hudson 2003 - Extend Eastward in Long Island

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NYSDEC Stormwater Permits TMDL Conditions and Retrofit Options

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Nysdec stormwater permits tmdl conditions and retrofit options

NYSDEC Stormwater Permits TMDL Conditions and Retrofit Options

Shohreh Karimipour, P.E.


Ms4 permit tmdl

MS4 Permit & TMDL

  • Designation of additional MS4s in TMDL watersheds

  • 2003 - Extend past areas to boundaries of New York City drinking water watershed East of Hudson

  • 2003 - Extend Eastward in Long Island

  • 2008 - Peconic Estuary TMDL designates Eastern Long Island


Nyc eoh watershed improvement strategy

NYC EOH Watershed Improvement Strategy

Local Requirement for E&SC - 5,000 ft2 to 1 acre (12/31/2009)

Local SWPPP Review Against Enhanced P Removal (9/30/2008)

Map entire storm sewer system over 5 years

Retrofit plan and schedule 3/9/2009 (alone), 12/31/2009 (RSE)

Septic Inspections, Maintenance, and Rehabilitation/3 Yr.

Targeted Education and Outreach

Specific System Maintenance Requirements

Specific Turf Management Requirements

Leaf and Yard Waste Control Requirements


Loading assessments

Loading Assessments

  • By 1/8/2013 model relative changes in load to impaired waters (no TMDL) with non-negligible changes to land areas or practices

  • By 1/8/2013 model to assess progress in reducing the pollutant of concern to meet TMDL

  • Modeling alternatives in responsiveness summary (Appendix D)


Enhanced phosphorus removal sizing criteria

Enhanced Phosphorus Removal Sizing Criteria


Retrofits

Retrofits

  • Retrofits are modifications or additions to existing infrastructure to reduce pollutant loadings. Examples (pp72 and 73):

    • Better Site Design Approaches

    • Storm Sewer Rehabilitation

    • Stabilizing Dirt Roads

    • Conversion of Dirt Parking to Pervious Pavement

    • Conversion of Dry Ponds to Detention Ponds or Wetlands

    • Converting Abandoned Buildings to Open Space or SMP

    • Control of Downstream Erosion Effects

    • Direct Control Erosion Effects (Plunge Pool, Velocity Dissipaters)

    • Upgrade of Existing Conveyance to Provide Quality and Quantity Control

    • Reforestation


Retrofit permit requirements in april 08 ms4 permit

Retrofit Permit Requirementsin April, 08 MS4 Permit

  • Identify sites with problems

  • Choose projects based on:

    • Pollutant reduction potential

    • Use of proven technologies

    • Economic feasibility

  • Procedures for design, permits, funding, O&M

  • Approvable plans, schedules and funding sources


Retrofit permit requirement in april 08 ms4 permit

Retrofit Permit RequirementIn April, 08 MS4 Permit

  • East of Hudson MS4s acting alone submit approvable plan and schedule by March 9, 2009

  • East of Hudson MS4s in RSE submit by December 31, 2009

  • Onondaga, Greenwood Lake, Oyster Bay, Peconic MS4s submit by March 9, 2011


Dec retrofit modeling paper

DEC Retrofit/Modeling Paper

  • Basis for Retrofit Section of TMDL Implementation

  • Short term expectations: simpler retrofits- e.g. ditches to dry swales, erosion repairs and disconnecting rooftops ~ 0.3 - 0.5 lb/acre/yr

  • Long term expectations: more sophisticated retrofits - more sophisticated targeting - considering cost effectiveness

  • Load reductions for retrofits can be assigned using WTM or Win-SLAMM


Other key points

Other Key Points

  • Older TMDLs do not distinguish MS4 loads from non-point source

  • MS4 load reduction would be achieved with Retrofits and non-structural BMPs

  • Retrofits may include Redevelopment or routine system upgrades

  • Guidance: Urban Stormwater Retrofit Practices Manual

  • Desktop Assessment & Retrofit Reconnaissance Investigation


East of hudson tmdl implementation plan concepts

East of Hudson TMDL Implementation Plan Concepts

  • Establish sustainable annual mass reductions and maximum 15 year schedule

  • Apportion reductions by MS4 – for Phosphorus, base apportions on high intensity development

  • Allow for bubble or individual load reductions

  • Reductions credited based on modeling projects

  • Re-evaluate every five years ( use monitoring data/modeling)


Greenwood lake watershed improvement strategy

Greenwood Lake Watershed Improvement Strategy

Local SWPPP Review Using Enhanced P Removal by 9/30/2008

Watershed Based Retrofit plan and schedule 3/9/2011

Septic Inspections, Maintenance, and Rehabilitation/3 Yr

Targeted Education and Outreach


Onondaga lake watershed improvement strategy

Onondaga Lake Watershed Improvement Strategy

Local SWPPP Review Using Enhanced P Removal by 9/30/2008

Watershed Based Retrofit plan and schedule 3/9/2011

Targeted Education and Outreach


Oyster bay and peconic watershed improvement strategy pathogens

Oyster Bay and Peconic Watershed Improvement Strategy (Pathogens)

Watershed Based Retrofit plan and schedule by 3/9/2011

Septic Inspections, Maintenance, and Rehabilitation/ 3 Yr

Targeted Education and Outreach

Pet Waste Control

Goose Population Management


Peconic watershed improvement strategy nitrogen

Peconic Watershed Improvement Strategy (Nitrogen)

Watershed Based Retrofit plan and schedule by 3/9/2011

Septic Inspections, Maintenance, and Rehabilitation/3 yr.

Targeted Education and Outreach

Specific Turf Management Requirements


Other tmdl implementation plans

Other TMDL Implementation Plans

  • EPA required TMDL Plans

  • Follow similar process for other watersheds

  • Potential change of criteria at end point

  • Mostly phosphorus limited watersheds

    • Albany area, Monroe Co., down state

  • Implementation plan would provide direction for what would be approvable


Questions

Questions


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