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Ms. Rachel Juba July 8, 2022 Page 2 S:\Users\R_Juba\DEVELOPMENT PROJECTS\Drake Property Sketch Plan\Engineers Memo Oneka Prairie 070722.docx property and property to the east as it may be more effective to serve the entire development from the lift station. The depth of the sewer in Fairoaks Avenue is not of sufficient depth to serve the developable area to the east nor the majority of the subject property. Once the applicant can provide a grading plan, staff can further evaluate and provide recommendations prior to laying out the sanitary sewer to service the site. 8. If the project is to be phased, a staging plan will be required to be shown with utility work being identified to occur within the final platted area only. If grading is different from the phasing plan for utilities or final plat area, a plan addressing temporary drainage measures outside the platted area will be required. Stormwater Management/Wetlands 9. Volume control/water quality standard will be required, which is 1.1 inches off new impervious surfaces. Water reuse will be the preferred BMP option for the site for volume reduction. If an additional BMP is to be used, the TP removal factor from RCWD Rule C, Table C1. must be applied. 10. Peak stormwater runoff rates for the proposed project must not exceed existing rates for the 2-year and 10-year 24-hour rainfall events using Atlas 14 rainfall depths. 11. Peak stormwater runoff rates for the 100-year 24-hour rainfall event is limited to 0.1 cfs/acre. 12. Lowest building opening must be at least 3’ above the 100-yr HWL for both wetlands and BMPs and 4’ above the current groundwater elevations. 13. Private ditches to JD3 are located onsite. Maintain private ditch drainage to JD3. Developer to confirm with RCWD if a permit for Rule I is needed. 14. No 100-year floodplains located onsite. 15. Stormwater Management facilities will be required to be within drainage and utility easements. 16. The applicant is proposing to utilize stormwater reuse as part of their stormwater management plan. 17. A wetland delineation on the parcel has been completed. 18. The concept plan shows a number of impacts to wetlands. The applicant may find it helpful to have a pre-application meeting with the Technical Evaluation Panel to get a better idea of what impacts may or may not be allowed Thank you for the opportunity to provide comments on this project. If you have any questions, please do not hesitate to contact me at 651-286-8463. Sincerely, WSB Mark Erichson, PE City Engineer cc: Scott Anderson, Public Works Director (email only) Liz Finnegan, Senior Engineering Technician (email only)