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NPDES Phase I MS4 SWMPs

EPG was contracted to assist Chatham County, Savannah, Bloomingdale, Garden City, Pooler, Port Wentworth and Thunderbolt with the update of the NPDES Phase I MS4 SWMP in compliance with the recent NPDES Phase I MS4 permit reissuance in April 2010. This project included meetings and discussions with City staff, coordination with the co-permittees and MPC, and ongoing communication with the Georgia EPD Program Manager. Courtney Reich of EPG served as the original author for the SWMPs for these communities when their NPDES Phase I MS4 permit was last reissued in 2005.

Through this project, EPG updated the communities' 2005 SWMP documents to be compliant with new NPDES Phase I regulations and EPD requirements. In addition, it was essential to our clients that we develop an SWMP implementation schedule that was consistent with their existing resources and programs.

Specific SWMP elements that were developed as part of this process include:

  • Countywide TMDL Monitoring Plan that relies on existing sampling programs
  • List and map of drainage system outfalls that discharge into waters of the state only
  • Drainage system inspection schedule that allowed for a "ramping up" of effort
  • A recommendation to use an existing and approved process to evaluate the communities' codes for consistency with Green Infrastructure

 

One unique feature of this project is that Chatham County and these municipalities are "co-permittees" under their individual NPDES Phase I MS4 permits. This allows for joint implementation of various program elements including monitoring and public education. The communities all benefit from the coordinated implementation because it reduces costs and allows for a more "watershed-based" approach as stormwater does not stop at the jurisdictional boundary.