Prior to using the flow chart, gather the following preliminary information.

  • Conduct site review
  • Define performance goal

Conduct site review

  • Aerial photos and topographic maps
  • County soil surveys and other soil information as available
  • County Geologic Atlas
  • Local groundwater levels
  • DWSMA and Wellhead Protection maps
  • FEMA and local floodplain maps
  • Soil borings and site survey
  • MPCA listing of potentially contaminated sites
  • Phase 1 and 2 Environmental Site Assessments
  • TMDLs and local water quality standards
  • Wetland delineations, MNRAM assessments, and wetland classifications
  • Proposed conditions, conceptural/preliminary site design
  • Local zoning and land use requirements/ordinances, including stormwater rate control requirements
  • Communication with local landowners, LGU, or others knowledgeable about the site
  • Site inspection

Define treatment goal

  • New and redevelopment projects: Retain on site a volume of 1.1 inches from impervious surfaces
  • Linear projects: Retain on site the larger of 1.1 inches from all new impervious surfaces or 0.55 inches from all new and fully reconstructed impervious surfaces

This page was last edited on 8 December 2022, at 17:25.