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4 4 KRUNCH Storage, Joe Huth Gem Lake, Minnesota Proposed Stormwater Management Rate control will be achieved via a small basin located in the southwest portion of the site. A 48-inch outlet control structure (OCS) with an exposed 15-inch orifice & split grate top will regulate the discharge. This OCS will connect to the existing storm inlet and outlet in the area, bypassing upstream stormwater flow. We have directed as much stormwater as practicable to the basin to reduce overall runoff. Table 1 presents peak discharges for the entire site. Tables 2 and 3 provide a comparison between existing and proposed directional runoff conditions under Type II 24-hour storm events. In all cases, the proposed runoff rates are lower than the existing conditions. Table 1 –Total Site Storm Event Existing Runoff Rate (1R) (cfs) Proposed Runoff Rate (1R) (cfs) 2-year (2.79”) 3.28 3.11 10-year (4.17”) 5.33 4.96 100-year (7.29”) 9.50 8.20 Table 2 – Site to East Storm Event Existing Runoff Rate (2S) (cfs) Proposed Runoff Rate (2S) (cfs) 2-year (2.79”) 0.61 0.57 10-year (4.17”) 0.99 0.95 100-year (7.29”) 1.86 1.84 Table 3– Site to West Storm Event Existing Runoff Rate (2R) (cfs) Proposed Runoff Rate (2R) (cfs) 2-year (2.79”) 2.72 2.61 10-year (4.17”) 4.42 4.12 100-year (7.29”) 7.83 6.60 Refer to Appendix B and C for additional information on modeling and storm sewer calculations. Conclusion The proposed design for the KRUNCH commercial property meets the design requirements of the City of Gem Lake. This report was created by Land & Resource Consulting. Please direct questions to Jackson Keeley at jacksonk@landandresource.com. Certification I hereby certify that this report was prepared by me, or under my direct supervision, and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. Date: 10/30/2025 Randall Hedlund License No. 19576