04-10-2023 Council Packet - Laserfiche WebLink

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www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • Use your preferred relay service • Available in alternative formats wq-strm2-47 • 9/27/18 Page 2 of 11 Yes N/A SWPPP narrative should contain the following (continued): A description of the permanent stormwater treatment system A description of procedures to amend the SWPPP A description of methods used to minimize soil compaction and preserve topsoil In designing the stormwater controls, the SWPPP must account for: Yes N/A The expected amount, frequency, intensity and duration of precipitation The nature of stormwater runoff and run-on at the site, including factors such as expected flow from impervious surfaces, slopes and site drainage features The range of soil particles expected to be present The stormwater volume, velocity, and peak flowrates to minimize discharge of pollutants in stormwater and to minimize channel and streambank erosion and scour in the immediate vicinity of discharge points A description of any specific chemicals and chemical treatment systems used for enhancing the sedimentation and how compliance with item 9.18 will be achieved Acres of impervious surfaces (pre- and post- construction) If permittees determine compliance with the following requirements is infeasible, document the determination: Yes N/A Temporary sediment basins (must describe alternative BMPs used) If the permanent treatment system for linear projects cannot be constructed within the right-of-way (reasonable attempt to obtain the right-of-way must be made) Buffer zones The full volume reduction requirement Any required site assessments for groundwater or soil contamination Tabulated quantities of all erosion prevention and sediment control BMPs anticipated for the life of the project Notes Yes N/A The plan sheets should contain the following: A site map or maps including: Yes N/A Existing and final grades Drainage area boundaries Direction of stormwater flow All discharge points where stormwater is leaving the site or entering a surface water Soil types Impervious surfaces Locations of potential pollutant generating activities (as identified in Section 12) Areas of steep slope (3:1 or greater) All surface waters, existing wetlands, and stormwater ponds/basins within one aerial mile that receive stormwater from the construction site, during or after construction Note: If they do not fit on the plan sheets, use an arrow to note the direction and distance Notes