The U.S. Environmental Protection Agency (EPA) estimates that 20 to 150 tons of soil per acre are lost every year to stormwater runoff from construction sites. Controlling erosion can significantly reduce the amount of sediment and other pollutants from entering your municipal separate storm sewer system (MS4). Construction site inspectors play a critical role in checking that the construction sites within your municipality are using and properly maintaining adequate erosion, sediment, and waste control measures during construction.
The MS4 General Permit requires permitted MS4s to have a regulatory mechanism as stringent as the MPCA’s Construction Stormwater Permit for erosion, sediment, and waste controls (MS4 General Permit Part III.D.4.a). In addition, the MS4 General Permit requires your written procedure for conducting site inspections to include a checklist or other written means to document each site inspection (MS4 General Permit Part III.D.4.d.(4) and Part III.D.4.f.(2)). You must retain these documents for three years beyond the term of the MS4 Permit (MS4 General Permit Part IV.C.).