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MCM 5 Post-Construction Stormwater Management

[[File:InfiltrationBasinDuringConst.JPG|thumbnail|right|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 separate 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 [https://stormwater.pca.state.mn.us/index.php?title=When_infiltration_is_not_authorized_under_a_stormwater_permit here]. 
:*Mitigation provisions if TSS and TP cannot be managed onsite.
:*A [[#Model language|long term maintenance agreement]] for private structural stormwater BMPs. 
:*[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. 
:*All documentation described [https://stormwater.pca.state.mn.us/images/d/dd/MS4DocumentaionRequired.pdf here].

==Resources==
Click on the blue links above in the "MS4 General Permit requirements" section to jump to the referenced section or page. Links to specific resources related to MCM 5 are listed 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. 
*[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
*[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 
*[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
*[https://www.pca.state.mn.us/sites/default/files/wq-strm4-98.docx "Model" MCM 4 and MCM 5 regulatory mechanism guidance (wq-strm4-98)]
*[https://www.pca.state.mn.us/sites/default/files/p-gen3-16.pdf Minimal impact design standards: Community assistance package (p-gen3-16)]

===Model language===
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]].
*[[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
*[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
*[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
*[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
*[[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
*[[media:Private BMP Stormwater Maintenance Agreement - Cottage Grove.docx|Long-term maintenance agreement model]] - Cottage Grove's long-term maintenance agreement template

===Example ordinances===
*[https://www.ci.bayport.mn.us/198/Municipal-Separate-Storm-Sewer-System-MS The City of Bayport's Stormwater Ordinance] - City of Bayport's ordinance that adopts MIDS
*[[media: West Lakeland Township Stormwater Ordinance.pdf| West Lakeland Township's Stormwater Ordinance]] - West Lakeland Townships's ordinance that adopts MIDS
*[[media: Lakeland Stormwater Ordinance.pdf|City of Lakeland's Stormwater Management Ordinance]] - City of Lakeland's ordinance that adopts MIDS

===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.
*[[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
*[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]

===Checklists===
Below are methods that local stormwater staff are currently using to meet the site plan review documentation Post-Construction Stormwater Management requirements in the MS4 General Permit for MCM 5 - Post-Construction Stormwater Management.
*[https://www.pca.state.mn.us/sites/default/files/wq-strm2-47.pdf Site plan review checklist] - MPCA's site plan review checklist
*[[media:Site Plan review checklist - Cloquet.xls| Site plan review checklist]] - City of Cloquet's site plan review checklist
*[[media:SWPPP Review Checklist - Hutchinson.docx| Site plan review checklist]] - City of Hutchinson's site plan review checklist
*[[media:Site Plan Review Checklist - Rice Lake.docx|Site plan review checklist]] - City of Rice Lake's site plan review checklist

===Example Procedures===
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. 
*[[media:Site Plan Review Procedure - Elk River.pdf|Site plan review procedure]] - City of Elk River's site plan review procedure
*[[media:Site plan review procedure - Cloquet.pdf|Site plan review procedure]] - City of Cloquet's site plan review procedure
*[[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

==Post-construction stormwater management==
The information in this section provides MS4 permittees with tools they can use to meet MCM 5, which addresses post-construction stormwater management.
*[[:Training programs and print materials for Minimum Control Measure (MCM) 5]]