02/11/2026 PZ Combined Packet - Laserfiche WebLink

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Ms. Katie Larsen 02/04/2026 Page 2 •Stormwater Management Stormwater management for the Harvest Grange site consists of a two sedimentation basins to provide rate control and water quality treatment. Additional grading is proposed for borrow material and floodplain fill mitigation. There is a significant amount of offsite flows from the east and south that will be passed through the site via an existing ditch system. Existing and proposed discharge rates are summarized below. Pre- and Post- Development Discharge Rates (cfs) Condition2-Year10-Year100-Year10-Day Snowmelt Needed if basins Existing30.6264.80129.01 landlocked Currently Needed if basins 11.8428.7467.10 Proposedlandlocked Comments 1.More detailed utility design will be required in future submittals to review constructability and conflicts. More comments may be generated at that time. 2.Show the EOF location and elevation for pond 13P on the grading plan. Ensure there is sufficient freeboard to the proposed townhomes to the west. 3.Stormwater reuse calculations should include the RCWD-specific reuse spreadsheet. 4.Confirm no water appropriation permit is needed from the MN DNR due to potential groundwater withdrawal in basin 11 for irrigation needs. 5.Deconflict storm sewer and proposed trees to the extent practical, overlap of planting can result in root intrusion long-term, especially where trees are proposed near structures. th 6.Review impacts of grading to drainage of existing culverts under 20 Avenue (CSAH 54) 7.Provide a rear yard drainage system to keep site water from draining on to adjacent private property at the westerly development line. 8.The existing ditch system needs to cleared and cleaned out and regraded with the project. Please incorporate into the final construction plans according. •Water Supply Water supply for the Harvest Grange development will be served by an existing 16-inch diameter trunk watermain along 20th Avenue (CSAH 54) that will be looped through the site to an existing 8” diameter watermain within Heritage Avenue. Otherwise, the development will include a water system with predominately 8- inch diameter ductile iron pipe (DIP) water main with 1-inch Type K copper services being extended to each lot. An additional water stub will be extended to the north along Street D for looping and future development. The development is in the City’s Drinking Water Study Management Area and has moderate vulnerability and would be subject to those requirements. Harvest Grange Submittal - Engineering Review