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 8 of 11 Yes N/A Permanent treatment method selected (continued): Infiltration (continued) Yes N/A A pretreatment device is planned All stormwater routed to the practice can be discharged in 48 hours Note: Any additional flows must bypass the system through a stabilized discharge point There is a way to visually verify the system is operating as designed Adequate maintenance access is provided Notes Filtration (e.g., sand filters, biofiltration areas, swales using underdrains and check dams, and underground sand filters) Yes N/A The filtration system is designed to remove at least 80% of total suspended solids (TSS) The SWPPP includes requirements to not install the filter media until the drainage area is fully stabilized If the filter media is installed before the drainage area is fully stabilized, rigorous erosion prevention and sediment control BMPs are used to keep all runoff and sediment out of the filtration practice A pretreatment device is planned All stormwater routed to the practice can be discharged in 48 hours or less There is a way to visually verify the system is operating as designed Appropriate testing has been conducted to ensure a minimum of three feet of separation from the bottom of the filtration practice to the seasonally saturated soils and/or bedrock If there is less than three feet of separation, the filter has been designed with an impermeable liner Adequate maintenance access is provided Notes Wet sedimentation basin Yes N/A The basin must provide live storage of one inch (or the remainder of volume not reduced) of runoff from new impervious surfaces The basin must provide a permanent volume of 1,800 feet3 below the outlet pipe for each acre draining to the basin The permanent pool depth is between 3 feet and 10 feet Notes