Construction Stormwater General Permit Guidance

Description

I NDIANA D EPARTMENT OF E NVIRONMENTAL MANAGEMENT We Protect Hoosiers and Our Environment. Office of Water Quality Wetlands and Stormwater Section Construction Stormwater General Permit (CSGP) Construction/Stormwater Pollution Prevention Plan Development Guidance The Construction Stormwater General Permit (CSGP) requires the development of a Construction Plan for both the construction and post-construction phases of a project. An integral part of the Construction Plan includes a Stormwater Pollution Prevention Plan (SWP3). The SWP3 addresses several issues. First, the plan outlines how erosion and sedimentation will be managed on the project site to minimize the discharge of sediment off-site or to a water of the state. Second the plan addresses the proper management of other activities that may generate pollutants during construction. This may include disposal of building materials, management of fueling operations, etc. Finally, the plan should also address pollutants that will be associated with the post-construction land use. The SWP3 must be developed in accordance with the CSGP, and where applicable, the requirements of a local Municipal Separate Storm Sewer (MS4) ordinance. The SWP3 must be signed by a "trained individual “as defined in Appendix B in the permit. The following information is an outline of items that are required to be contained in a Construction Plan that is submitted pursuant to the CSGP. The items within this document have been divided into three distinct categories, including: (1) Construction Plan Elements (2) Erosion and Sediment Control/Project Site Management (3) Post-construction Each item is identified with a letter and number that can be directly related back to the review sheet that will be utilized by staff reviewing construction plans in accordance with the CSGP. Each item also contains information that explains the expectation for each plan element and the level to which it should be described or represented within the construction plans. Stormwater Program CSGP – Construction/Stormwater Pollution Prevention Plan Guidance March 8, 2022 Page 1 of 17 Construction Plan – General Plan Components (Section A) A1 - Index of the location of required plan elements in the construction plan: The plan index should include a list of the required items in the CSGP and where they occur in the plan. Plan preparers often have their plan index mirror items in the IDEM standard plan review checklist.