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Ms. Katie Larsen <br />5/6/2026 <br />Page 3 <br />3.Per the 2024 RCWD rules, stormwater ponds designed in accordance with NURP <br />criteria satisfy stormwater management requirements. The proposed filtration bench <br />is not needed and should be removed to simplify future maintenance of Pond 2P. <br />a.While implied in the details, show the location of the proposed riprap- <br />stabilized spillway for the pond in the plan view. <br />Pioneer (4/13/2026) Revised. <br />4.Without the proposed filtration bench, the new proposed outlet through OCS-2 shall <br />be removed. Rate control should be achieved for the updated design via alterations <br />to the existing outlet structures. The NWL of 900 must be maintained. <br />Pioneer (4/13/2026) Revised. <br />5.Applicant to confirm if storage curves of Pond 2P in HydroCAD are based on as-built <br />or surveyed depths. If surveyed, include bathymetry linework in SWMP for <br />verification. <br />Pioneer (4/13/2026)We prepared a topographic survey of the basin included the <br />pool. This has been included in the revised calculations and plans. <br />6.Original permitted drainage areas and stormwater calculations for Pond 2P shall be <br />included as an appendix to the SWMP. <br />Pioneer (4/13/2026)Included. <br />7.Applicant to confirm the extent of runoff routed to Pond 2P in full buildout conditions <br />of Otter Crossing South. Any proposed future runoff must be included in the <br />stormwater calculations. <br />Pioneer (4/13/2026)A future pond was added to the model that will discharge to <br />pond 2P. <br />8.Pretreatment by way of sumped storm manhole or hydrodynamic separator at <br />structure STMH-10 must be provided for flows leaving the private site. <br />Pioneer (4/13/2026) Revised. <br />9.HydroCAD modeling must use dynamic storage-indication (Dyn-Stor-Ind) routing to <br />properly account for tailwater effects. <br />Pioneer (4/13/2026)The model was rerun using Dyn-Stor-Ind. Note we do not have <br />information to determine tailwater elevations in Coldwater Creek. <br />10.Existing pond maintenance and sediment removal to maintain original pond capacity <br />should be included in the project plans. Outlet structures and modifications to the <br />existing structures will need to meet current standards. <br />Pioneer (4/13/2026)Revised calculations and outlet structure design will be <br />submitted. Per staff comments sediment removal can be differed to Phase 3. <br />Water Supply <br />Water for the platted commercial lots is proposed to be served by connecting to the <br />th <br />existing 8” water service stubs on the north side of 70 Street. Service for Lot 1 will <br />require extending across Lot 2. <br />Comments: <br />1.Easement will be required in favor of the Taco Bell site for utilities from the north side <br />th <br />of 70 Street <br />Pioneer (4/13/2026)Easement is shown on plans. <br />WSB (5/6/2026) WSB (5/6/2026) Complete <br />2.Hydrant coverage to be reviewed by City Fire Official. <br />WSB (5/6/2026) In progress <br />nd <br />Otter Lake South 2 – Engineering Review <br /> <br />