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Ms. Katie Larsen <br />04/04/2025 <br />Page 3 <br />The 2.5" event is calculated within our pond spreadsheet which gives us our required <br />dead storage through calculations within this spreadsheet. <br />9. As many wetlands receiving runoff are Type 1, they are classified as highly <br />susceptible and therefore must have no increase in bounce or inundation <br />periodfor the 2- and 10-year events. <br />Kjolhaug environmental reviewed the wetland susceptibility and all wetlands <br />were adjusted. No wetlands are considered highly susceptible. <br />10. Detailed storm sewer plans, profiles, and calculations will be needed in <br />future submittals. This should include all utility crossings to confirm <br />constructability and any need for insulation. It should also include structure <br />type and sizing to confirm constructability with pipe alignments. It is likely that <br />more storm sewer design comments will be generated at that time. <br />The plan and profiles will be provided with final plans. Design spreadsheet <br />and structure map provided until final plans are made. <br />a. The pipe run from FES to 503 as shown has a velocity under the minimum of <br />3 ft/s. <br />FES removed as it does not provide a benefit. No surface water can be <br />directed towards pond 500 in this location. <br />11. All proposed storm sewer serving public roads must be a minimum 15" diameterand <br />consist of RCP. <br />Noted. <br />12. Inlet spread and run calculations, especially at sag points, will be needed toconfirm <br />public roads are designed in accordance with City standards of maintaining an 8' <br />drivable lane during the 3-year storm event. <br />Spread calcs added — based on 3-year event. <br />13. Erosion control blankets must be shown on slopes 4:1 and steeper, such as around <br />proposed basins. <br />Erosion control blanket added where necessary. <br />• Water Supply <br />The development will include a water system with 8 to 16 inch diameter ductile iron pipe <br />(DIP) water main with 1-inch Type K copper services being extended to each lot. <br />Comments: <br />1. Connect to existing 16" DIP Watermain <br />Note added <br />2. Identify on all plans coordinating with utility (gas) provider for utility installation, <br />grading, and street construction <br />Note added. <br />3. Verify potential conflicts at all utility crossings <br />a. Maintain minimum 18" separation from watermain/services <br />Watermain will be adjusted (lowered) as needed to maintain separation from <br />service crossings. This will be determined with final plans. <br />b. Insulate when separation between storm sewer and watermain orforcemain <br />is less than 36" <br />Noted. To be shown on final plans. <br />4. Provide barricades to protect the temporary hydrant at the ends of Street A and <br />Street C <br />Barricades added and called out on site plan. <br />5. Add a gate valve to the western leg of the Street C/D tee <br />Valve added <br />6. Extend watermain and hydrant with Street B to Andall Street with this development <br />Street added and grading as been adjusted. <br />• Sanitary Sewer <br />Nature Refuge North Addition Engineering Review <br />