07-14-25 - City Council Agenda - Laserfiche WebLink

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Ms.Katie Larsen 06/04/2025 Page 3 9. Rational method pipe capacity calculations must be provided showing storm sewer is sized to convey the 10-year storm event. The minimum pipe diameter is 15". 10. The storm sewer draining to the pond must be raised to outlet at the pond NWL of 904. 11. The pipe between the catchbasins is 18" diameter, but the pipe to the pond is 15" diameter. Resize one or the other to avoid flow constriction. a. This pipe sizing also does not match the pipes modeled in HydroCAD. 12. Confirm constructability of MH-119 as a 2x3 structure based on proposed pipe sizes and alignments. 13. Mesic prairie seeding should continue down to the BMP NWL instead of southern boulevard. • Water Supply The proposed Erickson Property water system extension is consistent with the original Watermark preliminary plat. This development will be served by 8- inch diameter ductile iron pipe (DIP)water main which was stubbed with the Watermark 5th Addition and with 1-inch Type K copper services being extended to each lot. A future 8" stub will be provided on the north end to connect to the 8"water stub provided on Osakis Street with the Watermark 6th Addition in the future. Comments: 1. Provide utility profiles 2. Call out all utility crossings a. Maintain minimum 18" separation b. Insulate when separation between water(services/main) and storm sewer is less than 36" 3. Show existing watermain along Norway Ln 4. Test the existing gate valve in Norway Ln a. If holding, utilize the existing gate valve in Norway Ln for testing i. Do not connect to existing with a gate valve b. Otherwise, remove watermain back to and including existing gate valve i. Connect to existing with new 8" gate valve at that location 5. Utilize current utility as-builts/plans for Watermark 51h and 61h Additions • Sanitary Sewer The proposed Erickson Property sanitary sewer is generally consistent with the original Watermark preliminary plat. Originally this street was to be served from the north with an 8" stub from Rainy Lane as part of the Watermark 6th Addition but, due to the northern most property in the stretch not participating, the segment will now need to be served from the existing sanitary sewer in Norway Lane which was installed as part of Watermark 5th Addition. This development will be served by 8- inch diameter poly-vinyl chloride (PVC) pipe along with 4-inch diameter Schedule 40 PVC service pipe to each lot. Comments: 1. Provide utility profiles 2. Create a detail for connection to existing sanitary sewer main with sanitary manhole a. Describe process for maintaining existing sanitary sewer, watermain, and storm sewer service as well as vehicle access during construction Erickson Property Development-Engineering Review Page 228 of 240