Warning: This page is an edit and testing page use by the wiki authors. It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.
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 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 Post-Construction Stormwater Management 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 PART III.STORMWATER POLLUTION PREVENTION PROGRAM (SWPPP)#5. Post-Construction Stormwater Management| MS4 General Permit requirements for MCM 5 - Post-Construction Stormwater Management.

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.