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Chapter 153 Water Resource Management Adopted 6/28/2022 <br /> Page 18 of 34 <br />(1)Minnesota Stormwater Manual, Minnesota Pollution Control Agency, as amended from time to time; <br />(2)Erosion Control Handbook, Minnesota Department of Transportation, 2006. <br />§ 153.56 STORMWATER MANAGEMENT STANDARDS. <br />(A)Stormwater BMP Design. <br />(1)Design Standards. BMPs shall be designed according to the design standards included in Appendix A: <br />Volume and Water Quality Calculations. Compliance with the water quality treatment standard will <br />be calculated by the applicant using Appendix A: Volume and Water Quality Calculations or industry <br />standard water quality models. <br />(2)The Minnesota Stormwater Manual, Minnesota Pollution Control Agency, as amended from time to <br />time is a supplemental resource, which provides examples of BMP's and design, construction, and <br />maintenance guidelines; <br />(3)The county spreadsheet calculator tool may be used to track and document stormwater treatment <br />requirements and credits. Other stormwater calculator tools may also be used. <br />(B)Treatment Volume Requirements. <br />(1)All projects requiring stormwater treatment must meet the requirements for rate, water quality, and <br />volume described in sections §§ 153.56(E) – 153.56(G). Treatment must be designed for the volume <br />of water draining to the feature. <br />(2)Non-Linear Projects. The treatment volume must be calculated as 1.0-inch times the sum of new and <br />fully reconstructed impervious surface. <br />(3)Linear Projects. The treatment volume must be calculated as the larger of 1.0-inch times the new <br />impervious surface or 0.5-inch times the sum of the new and fully reconstructed impervious surface. <br />(C)Treatment Locations/Sequencing. <br />(1)Treatment Locations. <br />(a)Water Quality. Water quality treatment must be provided on-site prior to discharging <br />stormwater runoff to a receiving waterbody. <br />(i)Non-linear Projects and New Linear Projects: If it is not feasible to provide full water quality <br />treatment prior to discharge to a receiving waterbody, structural treatment for TSS removal <br />must be provided at a minimum. Full water quality treatment shall then be provided at a 2:1 <br />ratio at a discharge point to a different receiving waterbody. <br />(ii)Linear Reconstruction Projects: Additional right of way, easements, or permissions should be <br />obtained to provide treatment within the drainage area to the same waterbody. If additional <br />right of way, easements, or permissions cannot be obtained, full water quality treatment <br />shall then be provided to a discharge point to a different receiving waterbody within the <br />project area. If it is not feasible to provide full water quality treatment prior to discharging <br />to a receiving waterbody, structural treatment for TSS removal must be provided at a <br />minimum. <br />(b)Volume Control. Volume control must be provided on-site within the same DNR catchment area <br />as the construction activity.