Agenda - Council Work Session - 02/23/2021

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The sources of water pollution in the LRRWMO are many and varied. Potential pollutant sources in the watershed include permitted pollutant sources, potentially contaminated sites, leaking above- and below - ground storage tanks, unsealed wells, and non -point sources. The MPCA maintains a database of potential environmental hazards, which includes permitted sites (air, industrial stormwater, construction stormwater, wastewater discharge), hazardous waste generating sites, leak sites, petroleum brownfields, tank sites, unpermitted dump sites, and sites enrolled in the Voluntary Investigation and Cleanup (VIC) program. This information is available online through the MPCA's What's In My Neighborhood program. Sites identified in this database are presented in Figure 2-16. The presence of potentially contaminated or hazardous waste sites should be considered as sites are redeveloped and BMPs are implemented. The presence of soil contamination at many of these sites, if not removed, may limit or prevent infiltration as a stormwater management option. More information about potential pollutant sources is available from the MPCA website: tt:// t I c0.st t-. .us/i }x. ./ 0t / ' n- .ts-i ► .:/ is-i In addition to point sources of pollution, stormwater runoff can be a significant source of some pollutants (see Table 2-10). Each city within the LRRWMO is required to maintain Municipal Separate Storm Sewer System (MS4) permit coverage from the MPCA. As a requirement of the permit, MS4 permittees must develop and maintain a stormwater pollution prevention program (SWPPP) which outlines programs and practices to minimize pollutant loading and water quality impacts resulting from stormwater management. More information is available from the MPCA a str .ter- s tt s:// 2-43 c .st t r/ ici