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Paved surfaces exacerbate the negative impacts of stormwater, including a increasing the stormwater discharge volume and pollutants in stormwater. Managing stromwater onsite post-construction is the more effective way to mitigate these impacts. MS4s must have and enforce a regulatory mechanism that prevents or reduces stormwater pollution on new development and redevelopment projects.
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[[File:InfiltrationBasinDuringConst.JPG|thumbnail|right|Infiltration basin protected by silt fence during construction]]
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==Introduction==
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Paved surfaces exacerbate the negative impacts to stormwater, including increasing the stormwater discharge volume and pollutants in stormwater. Managing stormwater onsite post-construction is the more effective way to mitigate these impacts. Minimum Control Measure (MCM) 5 of the [https://stormwater.pca.state.mn.us/index.phptitle=MS4_PART_III.STORMWATER_POLLUTION_PREVENTION_PROGRAM_(SWPPP) municipal seperate storm sewer system (MS4) General Permit] requires permittees to have and enforce a post-construction stormwater management program that prevents or reduces stormwater pollution in new- and re- development projects.
  
*[https://www.epa.gov/npdes/national-menu-best-management-practices-bmps-stormwater#post EPA MCM 5 guidance]
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==MS4 General Permit requirements for MCM 5==
*[https://www.pca.state.mn.us/sites/default/files/p-gen3-07.pdf MPCA Minimal Impact Design Standards guidance]
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The post-construction stormwater management program should include:
*[https://www.pca.state.mn.us/sites/default/files/wq-strm4-59e.pdf MPCA MCM 5 Technical Support guidance]
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:*A regulatory mechanism that requires proposers of construction activity to submit site plans with post-construction stormwater management best management practices (BMPs).
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:*A regulatory mechanism that requires the use of green infrastructure.
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:*A regulatory mechanism that specifies that there will be no net increase in stormwater volume, total suspended solids (TSS), and total phosphorus (TP) from new development projects; and a net decrease in volume, TSS, and TP for redevelopment projects.
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:*A regulatory mechanism that prohibits infiltration in certain situations, and restricts it in others, as described [https://stormwater.pca.state.mn.us/index.php?title=When_infiltration_is_not_authorized_under_a_stormwater_permit here].
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:*Mitigation provisions if TSS and TP cannot be managed onsite.
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:*A [[#Model language|long term maintenance agreement]] for private structural stormwater BMPs.
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:*[https://stormwater.pca.state.mn.us/index.php?title=Site_plan_review_procedure Site plan review procedures] to ensure the post-construction stormwater management is in accordance with the regulatory mechanism.
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:*All documentation described [https://stormwater.pca.state.mn.us/index.php?title=Documentation_requirements_and_documents_to_retain_under_the_MS4_permit here].
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==Resources==
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Click on the blue links above in the "MS4 General Permit requirements" section to get more information and resources specific to those permit requirements. In addition, all resources related to MCM 5 are below.
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===Fact sheets and guidance documents===
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Fact sheets and guidance documents should provide background information and tips to inform your approach to implementing MCM 5 - Post-Construction Stormwater Management.
 +
*[https://www.epa.gov/npdes/national-menu-best-management-practices-bmps-stormwater#post EPA MCM 5 guidance] - EPA's guidance and suggested BMPs for an effective post-construction stormwater management program
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*[https://www.pca.state.mn.us/sites/default/files/p-gen3-07.pdf MPCA Minimal Impact Design Standards guidance] - MPCA fact sheet on Minimal Impact Design Standards (MIDS) and how communities can adopt the MIDS requirements
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*[https://www.pca.state.mn.us/sites/default/files/wq-strm4-59e.pdf MPCA MCM 5 Technical Support guidance] - MPCA guide on how to comply with the 2013 MS4 General Permit MCM 5 post-construction stormwater management requirements
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===Model language===
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Fill in the blanks and adopt ordinance or long-term maintenance agreement language that meets the regulatory mechanism requirements for [[MS4 PART III.STORMWATER POLLUTION PREVENTION PROGRAM (SWPPP)#5. Post-Construction Stormwater Management| MCM 5 - Post-Construction Stormwater Management]].
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*[[media:Community assistance package.pdf|Minimal Impact Design Standards (MIDS) Community Assistance Package]] - MPCA's guidance and model ordinance language to implement low impact design within your community
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*[https://stormwater.pca.state.mn.us/index.php?title=Example_Maintenance_Agreement_2 Long-term maintenance agreement model] - MPCA's model long-term maintenance agreement template for general projects
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*[https://stormwater.pca.state.mn.us/index.php?title=Example_Maintenance_Agreement_1 Long-term maintenance agreement model] - MPCA's model long-term maintenance agreement template for rain gardens
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*[https://stormwater.pca.state.mn.us/index.php?title=Example_Maintenance_Agreement_3 Long-term maintenance agreement model] - MPCA's model long-term maintenance agreement template for stormwater quality treatment facilities
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*[[media:MaintenanceAgreementFormat - Middle St. Croix Watershed Management Organization.pdf|Long-term maintenance agreement model]] - Middle St. Croix Watershed Management Organization's long-term maintenance agreement template
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*[[media:Private BMP Stormwater Maintenance Agreement - Cottage Grove.docx|Long-term maintenance agreement model]] - Cottage Grove's long-term maintenance agreement template
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===Example ordinances===
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*[[media:City of Bayport Stormwater Ordinance.pdf|The City of Bayport's Stormwater Ordinance]] - City of Bayport's ordinance that adopts MIDS
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*[[media: West Lakeland Township Stormwater Ordinance.pdf| West Lakeland Township's Stormwater Ordinance]] - West Lakeland Townships's ordinance that adopts MIDS
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*[[media: Lakeland Stormwater Ordinance.pdf|City of Lakeland's Stormwater Management Ordinance]] - City of Lakeland's ordinance that adopts MIDS
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===Documentation and tracking templates===
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Documentation and tracking templates are examples that local stormwater staff are currently using to meet the [[MS4 PART III.STORMWATER POLLUTION PREVENTION PROGRAM (SWPPP)#5. Post-Construction Stormwater Management| MS4 General Permit requirements for MCM 5 - Post-Construction Stormwater Management]].
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*[[media:Enforcement Action Documentation Tracking.xlsx|Enforcement action documentation template]] - MPCA's template for documenting all enforcement actions used to compel compliance with your regulatory mechanisms
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*[https://stormwater.pca.state.mn.us/index.php?title=Documentation_requirements_and_documents_to_retain_under_the_MS4_permit Documentation that MS4 staff should retain] - List of all the documentation requirements (what information to keep, how long to keep it, level of detail to keep, etc.) for compliance with the [https://stormwater.pca.state.mn.us/index.php?title=MS4_General_Permit MS4 permit]
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===Checklists===
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Below are methods that local stormwater staff are currently using to meet the site plan review documentation [[MS4 PART III.STORMWATER POLLUTION PREVENTION PROGRAM (SWPPP)#5. Post-Construction Stormwater Management| requirements in the MS4 General Permit for MCM 5 - Post-Construction Stormwater Management]].
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*[https://www.pca.state.mn.us/sites/default/files/wq-strm2-47.pdf Site plan review checklist] - MPCA's site plan review checklist
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*[[media:Site Plan review checklist - Cloquet.xls| Site plan review checklist]] - City of Cloquet's site plan review checklist
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*[[media:SWPPP Review Checklist - Hutchinson.docx| Site plan review checklist]] - City of Hutchinson's site plan review checklist
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*[[media:Site Plan Review Checklist - Rice Lake.docx|Site plan review checklist]] - City of Rice Lake's site plan review checklist
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===Example Procedures===
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Example procedures are those that local stormwater staff are currently using to meet the [[MS4 PART III.STORMWATER POLLUTION PREVENTION PROGRAM (SWPPP)#5. Post-Construction Stormwater Management| MS4 General Permit requirements for MCM 5 - Post-Construction Stormwater Management]].
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*[[media:Site Plan Review Procedure - Elk River.pdf|Site plan review procedure]] - City of Elk River's site plan review procedure
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*[[media:Site plan review procedure - Cloquet.pdf|Site plan review procedure]] - City of Cloquet's site plan review procedure
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*[[media:ERP Post Construction - Rice Lake.docx|ERP - post construction stormwater management]] - City of Rice Lake's enforcement response procedure for observed violations with post-construction stormwater management requirements

Revision as of 21:07, 15 January 2021

Infiltration basin protected by silt fence during construction

Introduction

Paved surfaces exacerbate the negative impacts to stormwater, including increasing the stormwater discharge volume and pollutants in stormwater. Managing stormwater onsite post-construction is the more effective way to mitigate these impacts. Minimum Control Measure (MCM) 5 of the municipal seperate storm sewer system (MS4) General Permit requires permittees to have and enforce a post-construction stormwater management program that prevents or reduces stormwater pollution in new- and re- development projects.

MS4 General Permit requirements for MCM 5

The post-construction stormwater management program should include:

  • A regulatory mechanism that requires proposers of construction activity to submit site plans with post-construction stormwater management best management practices (BMPs).
  • A regulatory mechanism that requires the use of green infrastructure.
  • A regulatory mechanism that specifies that there will be no net increase in stormwater volume, total suspended solids (TSS), and total phosphorus (TP) from new development projects; and a net decrease in volume, TSS, and TP for redevelopment projects.
  • A regulatory mechanism that prohibits infiltration in certain situations, and restricts it in others, as described here.
  • Mitigation provisions if TSS and TP cannot be managed onsite.
  • A long term maintenance agreement for private structural stormwater BMPs.
  • Site plan review procedures to ensure the post-construction stormwater management is in accordance with the regulatory mechanism.
  • All documentation described here.

Resources

Click on the blue links above in the "MS4 General Permit requirements" section to get more information and resources specific to those permit requirements. In addition, all resources related to MCM 5 are below.

Fact sheets and guidance documents

Fact sheets and guidance documents should provide background information and tips to inform your approach to implementing MCM 5 - Post-Construction Stormwater Management.

Model language

Fill in the blanks and adopt ordinance or long-term maintenance agreement language that meets the regulatory mechanism requirements for MCM 5 - Post-Construction Stormwater Management.

Example ordinances

Documentation and tracking templates

Documentation and tracking templates are examples that local stormwater staff are currently using to meet the MS4 General Permit requirements for MCM 5 - Post-Construction Stormwater Management.

Checklists

Below are methods that local stormwater staff are currently using to meet the site plan review documentation requirements in the MS4 General Permit for MCM 5 - Post-Construction Stormwater Management.

Example Procedures

Example procedures are those that local stormwater staff are currently using to meet the MS4 General Permit requirements for MCM 5 - Post-Construction Stormwater Management.