nr 151 update – construction - waukesha county · • maintain until final stabilization •...
TRANSCRIPT
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NR 151 UpdatesConstruction Sites
Mary Anne Lowndes - WisDNRWaukesha County Stormwater
Workshop 3.16.2011
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Outline
• Changes to NR 151 – Construction Sites
• Effective 1-1-11– Construction – Post-Construction– Transportation
• EPA proposed changes
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Construction
• Non-permitted Sites• Permitted Sites
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Small Construction Projects
• Will apply to :– Sites disturbing less than one acre– Routine maintenance of road ditches < 5
acres– Any other permit exempt site
• Does not apply to:– One- and two-family dwellings regulated
by Commerce – Agricultural facilities and practices– Silviculture activities
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Small Construction Projects
• Requirements– Prescriptive - Yes– Performance Standard - No– Plan – No– State Permit or Fee – No and No
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Requirements
• Prevent tracking (pads or equivalent)• Inlet protection• Control of sediment into waters• Control of sediment from drainage
ways• Dewatering• Soil stockpile erosion control (7 days)• Manage runoff from other building
materials (cement washwater, chemicals)
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Construction Sites > 1 Acre
• Erosion Control Standards– Erosion and Sediment Control Measures– Prevention Measures– Implementation Measures
• Post Construction Standards
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Erosion and Sediment Control Measures
• Same as for non-permitted sites plus: – Prevent erosive flows at outlets and
downstream channels – Prevent the transport of untreated wash
water from vehicle and wheel washing
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Construction Site Performance Standard
Changed 80% sediment reduction to maximum of 5 tons/ac/yr. – Increases requirements on highly erodible
sites– Fits better with TMDLs– RUSLE2 not ready – 2 year delayed
implementation
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Preventive Measures
• Maintain existing vegetation where possible• Minimize soil compaction and preserve topsoil• Minimize land disturbance on slopes > 20%• Develop spill prevention and response
procedures
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Implementation Measures
• Installation before land disturbance and in accordance with the plan
• Maintain until final stabilization• Commence final stabilization when land
disturbing activity ceases and final grades reached on any portion of the site.
• Temporary stabilization when disturbance stops and will not resume for 14 or more calendar days
• Remove BMPs that are no longer necessary
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Post Construction
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Post-Construction Performance Standards
• Summary of modified post-construction performance standards:– Redevelopment TSS requirement– Peak flow control– Infiltration volume– Protective area standard for wetlands– Regional practices in waterways
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Redevelopment
• Eliminated exemption for no increase in imperviousness– Inserted NR 51.12(2)(bm)
to direct NOIs on or after 1-1-11 to new section
– New applicability in NR 151.121 does not include exemption for no increase in impervious area
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Redevelopment• Changed standard from 40% TSS
reduction for entire redeveloped site to 40% TSS reduction on parking lots and roads– Parking lots and
roads are dirtiest source areas
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Peak Flow Control
• Added 1-yr, 24-hr peak flow control requirement to the 2-yr, 24-hr peak flow requirement– 2-yr event was not protective of bank full
condition
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Peak Flow
• Locked down Pre-Development Curve Numbers.
• Exemption of no increase over 0.01 ft. in receiving stream is gone
• New exemption for lakes over 5,000 acres or streams and rivers segments draining more than 500 square miles.
• http://dnr.wi.gov/runoff/stormwater/guidance/Modeling_PostConstruction.pdf.
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Infiltration• Standard now based on ability of sites
to infiltrate
• Most Roads Exempt
• New Definition of Filtering Layer
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InfiltrationLevel of Connected Imperviousness
Performance Standard
Max. % Req. as Eff. Infil. area
Low ImperviousnessUp to 40%
90% of the pre-dev. infiltration volume
1%
Mod. Imperviousness> 40% and up to 80%
75% of the pre-dev. infiltration volume
2%
High Imperviousness> 80%
60% of the pre-dev. infiltration volume
2%
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Infiltration
• Source Areas– Prohibitions – Source Areas that may not
be infiltration– Exemptions – Source Areas that are
optional• Location of Practices
– Prohibitions – Do not infiltrate in these areas
– Separation Distances – Exemptions – Low permeable soils
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Protective Areas
• Increased buffer for highly sensitive wetlands from 50 to 75 ft.
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Protective Areas
• Sedge Meadows, Open and Coniferous Bogs, Low Prairies, Calcareous Fens, Coniferous Swamps, Lowland Hardwood Swamps and Ephemeral Ponds.
• Information on wetland types can be found at: http://dnr.wi.gov/wetlands/types.html
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Regional Practices
New Development –• Off-site practices cannot be in
navigable waters to receive credit for post-construction performance standards
• Off-site practices cannot be used for the construction phase
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Regional Practices
• Existing, redevelopment, in-fill– If constructed, contracts signed or bids
advertised by January 1, 2011– In intermittent streams if all applicable permits are received.– Not in perennial streams
Photo by Nick Vande Hey
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Transportation
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Road Reconstruction• Minor Road Reconstruction
– Exemption removed if conversion to urban X-section
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Road Reconstruction
• Road Reconstruction TSS standard– 40% reduction for parking lots and roads– Applies to areas of vehicular traffic
• Delayed imp. in permitted MS4s– Applies to municipal/DOT road projects in
permitted municipalities– Urbanized area for MS4 counties and
towns
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Transportation Projects
• Requirements / exemptions remain the same for:– Peak flow control – Infiltration – Protective area
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Highway ProjectsMinor Highway Reconstruction
Highway Reconstruction1
New Highway Construction
TSS Reduction No Yes (40%)2 Yes (80%)Peak Discharge
No No Yes
Infiltration No No No3
Protective Areas
Yes Yes Yes
1 For rural to urban X-Section – meet 40%
2 Delayed in permitted municipalities until 2017
3 For stand alone roads that are not part of a common plan of development
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Swale Treatment• Meet the following standards with
properly designed swales (Tech Std. 1005)– Post construction TSS– Peak flow– Infiltration
• Exception – discharges to certain waters such as ORWs, ERWs or impaired waters
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Schedule
• Rule effective January 1, 2011• All NOIs submitted on or after that date
must meet the new performance standards.
• Outreach ongoing.
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Impact on MS4s
• MS4 GP expired 12-31-10• Reissuance in progress• Will include timeline for ordinance
updates to incorporate revisions to NR 151 – Construction Sites
• Probably 18 month minimum
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Future Developments In Stormwater Runoff Regulation•Effluent Limitation Guideline numeric standards•EPA Post-Construction Regulations•EPA Existing Urban Area Regulations
– Retrofit and Redevelopment•NR 216•Trans 401
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QUESTIONS?
Questions & Discussion: