City of Northfield Stormwater Pollution Prevention Plan (SWPPP) A SWPPP is a plan that describes the strategies and steps that will be taken to prevent nonpoint source pollution discharging from a construction site. The Stormwater Pollution Prevention Plan (PDF) is a valuable tool and will become the backbone of the entire construction process related to erosion and sediment control and stormwater management, both during construction and post construction.
The SWPPP includes a description of all construction activity, temporary and permanent erosion and sediment control BMPs, permanent stormwater management, and other pollution prevention techniques to be implemented throughout the life of the construction project. The SWPPP includes a combination of narrative plans and standard detail sheets.
Construction Projects All construction projects disturbing 1 acre or more or that are part of a larger common plan of development that ultimately disturbs one acre or more are required to apply for an NPDES / SDS construction stormwater permit through the MPCA. The permit states that prior to submitting a permit application, the owner must develop a SWPPP for the construction site. The SWPPP is to be kept at the site for the duration of the project and retained in files for three years after the project is completed.
If the construction project disturbs 50 acres or more and discharges to a special or impaired water, the SWPPP must be submitted along with the permit application to the MPCA 30 days prior to the start of any construction activity.