The following case studies have been compiled to help you navigate the new stormwater permit. We hope the following videos and downloadable content will give you insight into the plethora of useful tools, program approaches and additional projects CEI has utilized in MS4 permitting. 


1. Yarmouth, MA 

As one of the leading Massachusetts communities, Yarmouth is actively implementing many of the new MS4 program requirements.  Work to date has included completion of a written Stormwater Management Program (SWMP) Plan, Illicit Discharge, Detection, and Elimination (IDDE) Plan, and much of the required mapping.  This presentation discusses lessons learned, as well as ongoing Operation and Maintenance (O&M) work currently ongoing throughout the community.


MS4 Implementation - Town of Yarmouth, MA - PDF Download





NPDES MS4 Phase II Program, Yarmouth, MA - PDF Download



2. Cape Cod, MA

The Town of Barnstable and Town of Chatham both have waterbodies subject to Nitrogen TMDLs that identify stormwater as a source of nitrogen load.  In cooperation with U.S. EPA Region 1, Town of Barnstable and Town of Chatham, two stormwater BMPs were designed and constructed consisting of a hybrid above-ground bioretention area with a subsurface gravel wetland to remove nitrogen from stormwater.  The project also has an ongoing water quality monitoring component.


Green Infrastructure Implementation Case Study - PDF Download



U.S. EPA Project Site

Cape Cod Nitrogen BMP Poster

Design and Construction of Green Infrastructure Stormwater BMPs on Cape Cod - PDF Download



3. Fall River, MA

As one of the largest cities in Massachusetts and with approximately 75% of stormwater collected in combined sewer systems, the City of Fall River has unique challenges to maintain compliance with both Combined Sewer Overflow (CSO) and MS4 permit requirements.  This presentation discusses methods and techniques used to perform IDDE inspections, the ongoing results of the City’s program, as well as what methods will be used in the future to ensure compliance.  


IDDE & CSO Investigations in the City of Fall River - PDF Download



Additional Information: Fall River CSO Abatement Program