09-08-25 - City Council Agenda - Laserfiche WebLink

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Ms. Katie Larsen 08/06/2025 Page 4 Nature Refuge North Addition Engineering Review WSB (5/23/2025) Complete 5. Per new RCWD standards, any new impervious flowing to a pond designed in accordance with NURP criteria counts as full water quality treatment, therefore the full volume credit can be claimed for new impervious flowing to Pond 500 and 600 if properly designed. Carlson (4/25/2025) Water quality revised. WSB (5/23/2025) Complete 6. Pond 300 should be renamed to Lake 300 as its depth is well in excess of the 10’ max depth outlined in NURP criteria. Additionally, it cannot be counted as providing water quality treatment. Carlson (4/25/2025) Note has been revised. WSB (5/23/2025) Complete 7. Please clarify why drainage area 26S is modeled. It is offsite and has no change from existing to proposed conditions. Carlson (4/25/2025) 26S was modeled assuming the Street B connection to Andall may occur. We are assuming the new street will have ribbon curb and there will be no drainage increase to 26 (for now). WSB (5/23/2025) Noted. 8. The 2.5” event should be modeled in HydroCAD to determine runoff volumes needed for pond dead storage. Carlson (4/25/2025) The 2.5” event is calculated within our pond spreadsheet which gives us our required dead storage through calculations within this spreadsheet. WSB (5/23/2025) Noted, though per Comment 3 above, these calculations need to be updated. Carlson (6/6/2025) Revised. WSB (6/25/2025) Complete 9. As many wetlands receiving runoff are Type 1, they are classified as highly susceptible and therefore must have no increase in bounce or inundation period for the 2- and 10-year events. Carlson (4/25/2025) Kjolhaug environmental reviewed the wetland susceptibility and all wetlands were adjusted. No wetlands are considered highly susceptible. WSB (5/23/2025) Complete 10. Detailed storm sewer plans, profiles, and calculations will be needed in future submittals. This should include all utility crossings to confirm constructability and any need for insulation. It should also include structure type and sizing to confirm constructability with pipe alignments. It is likely that more storm sewer design comments will be generated at that time. a. The pipe run from FES to 503 as shown has a velocity under the minimum of 3 ft/s. Carlson (4/25/2025) The plan and profiles will be provided with final plans. Design spreadsheet and structure map provided until final plans are made. WSB (5/23/2025) Noted. This submittal does not include a profile view of utilities. To be completed 11. All proposed storm sewer serving public roads must be a minimum 15” diameter and consist of RCP. Carlson (4/25/2025) Noted. Page 110 of 168