09/10/2025 PZ Combined Packet - Laserfiche WebLink

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Ms. Katie Larsen 09/03/2025 Page 4 is recommended to have an invert of 900 to ensure it remains submerged when the pond is drawn down for irrigation. 7.The 10’ aquatic bench should continue around the entire pond. If that is not feasible, the bench should at least be on the eastern side of the basin to provide a safety bench for residents. Landform Response (8/11/25) – Aquatic bench has been moved from western side to eastern side of pond. 8.Provide calculations demonstrating spread at the catchbasin low points is 10’ or less for the 3-year storm event. Landform Response (8/11/25) – See storm Calcs. 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”. Landform Response (8/11/25) – Updated. See storm calcs. WSB Response (9/3/25) – Pipes from CB-202 to FES-200 must be upsized to the 15” minimum. 10.The storm sewer draining to the pond must be raised to outlet at the pond NWL of 904. Landform Response (8/11/25) – Updated. 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. Landform Response (8/11/25) – Updated. See storm calcs. 12.Confirm constructability of MH-119 as a 2x3 structure based on proposed pipe sizes and alignments. Landform Response (8/11/25) – Structure is now a 48" CBMH. 13.Mesic prairie seeding should continue down to the BMP NWL instead of southern boulevard. Landform Response (8/11/25) – The BWSR Mesic prairie seeding and the MN DOT Southern Boulevard see hatches were flip flopped. See revised plans showing Mesic prairie seeding down to the NWL. 14.WSB Response (9/3/25) – How will CBMH-201 and -202 be paved over with the temporary cul de sac? How will road drainage be routed during those conditions? •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 th pipe (DIP) water main which was stubbed with the Watermark 5 Addition and with 1-inch Type K copper services being extended to each lot. A future 8” stub will be provided on the th north end to connect to the 8” water stub provided on Osakis Street with the Watermark 6 Addition in the future. Comments: 1.Provide utility profiles Landform (8/11/2025) Updated - See plans WSB (9/3/2025) Complete 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" WSB (9/3/2025) Reference City watermain offset detail Erickson Property Development - Engineering Review