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Ms. Rachel Juba January 5, 2023 Page 2 6. Erosion Control will be required to meet requirements for the NPDES stormwater permit and SWPPP requirements. Stormwater Management 7. Volume Control: Stormwater BMPs must be provided to meet a volume of 1.1 inches from new and reconstructed impervious surfaces. Infiltration BMPs and water reuse will receive full credit. Other BMPs such as filtration must incorporate a TP removal factor found in Table C1 of Rule C of the RCWD rules. Water reuse is the preferred BMP for residential developments. 8. Water quality requirement will be considered met if volume control is met. At a minimum, 85% of the impervious onsite is required to be treated. 9. Rate Control: Proposed discharge rates must be less than existing rates for the 2, and 10- year Atlas 14 rainfall event. Proposed 100-year Atlas 14 discharge rates be reduced to 0.1 cfs/acre for the site. 10. Two filtration basin locations were shown on the concept plan however overall sizing of the stormwater management needs has yet to be reviewed. Once appropriate submittals are provided as part of the preliminary plat process, staff will review for compliance with requirements. 11. Conditions for stormwater reuse for the site is ideal and should be incorporated into the project if feasible to meet volume reduction requirements. Stormwater reuse can be used to aid in meeting stormwater management requirements for the site. 12. An update on the proposed CLOMR/LOMR in the area should be provided as information on the LOMR has not been reviewed since June 2022. Approval from the MnDNR/FEMA of any modifications to the floodway/floodplain will be required. Typically, no habitable structures are allowed to develop in the floodway. 13. RCWD rules prohibit fill within the floodway. City Ordinance states no structure will be allowed in the floodway that will increase the base flood elevation or cause an increase in flood damages in adjacent reaches. 14. Fill within the floodplain requires compensatory storage per RCWD Rule E. 15. Proposed modifications to the public drainage system (Judicial Ditch 3) will require additional permitting with RCWD. A RCWD Rule I permit will be required for any proposed crossings of Judicial Ditch 3, and a RCWD Rule G permit will be required for any proposed crossings on regional conveyance systems (excluding public drainage systems). Rule G and Rule I permits are administered through RCWD rather than the City. Wetland 16. Approved wetland boundaries are shown correctly on the sketch plan. 17. The plan does show direct (fill) impacts to a portion of the wetlands, so this would require a replacement plan and most likely qualify for sequencing flexibility. However, these are sloped wetlands, so the developer would need to think about how to provide hydrology (from stormwater) so as not to result in drainage which would be an impact.