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Ms. Katie Larsen 07/03/2025 Page 4 Peltier Ponds Development - Engineering Review Based on the Estimated Daily Water Demand, which are reasonably conservative, the Peltier Ponds Development will increase the system’s average day demand by about 71,775 gallons per day (gpd). As shown on the Utility Plans, the existing 12” DIP trunk main on Watermark Way will be extended west through the development to its northern boundary similar to what is shown in the City’s 2040 Comprehensive Plan. A 12” stub will be extended to the north towards Rehbein’s Peltier View. There will need to be a connection to the 12” watermain stub on the west side of 20th Avenue at Rehbein Street and Rainy Lane. Otherwise, the development will include a water system with predominately 8- inch diameter PVC C900 water main with 1-inch Type K copper services being extended to each lot. Water supply will need to be evaluated in conjunction with current pending DNR water appropriation approvals. Additional water stubs will be extended to the south. The south portion of the development is in the City’s Drinking Water Supply Management Area (DWSMA) and would be subject to those requirements. Residential land use is consistent with the DWSMA vulnerability. Comments: 1. Avoid utility crossings where possible a. Keep watermain on west side along Gordon Ave/Street B 2. Provide utility profiles with final plat a. All utilities outside the right of way require an easement that meets a 1:1 slope with the utility invert (minimum 20') b. Show all utility crossings in profiles i. Maintain minimum 18" separation ii. Insulate when separation between storm sewer and water is less than 36" c. Identify conflicts between water, sanitary, and storm sewer mains and services 3. Locate hydrants and alter watermain such that hydrants are located at all water system highpoints a. Maintain minimum watermain cover b. Maintain hydrant coverage 4. Provide utility services per City details 5. Provide additional gate valves shown on plans 6. Provide temp hydrant/air relief/flushing, etc. on all watermain stubs 7. Keep watermain and sanitary sewer within the roadway • Sanitary Sewer As shown in the Lift Station Service Area Exhibit, sanitary sewer collection for the Peltier Ponds Development will be extended from the existing 10- inch diameter poly-vinyl chloride (PVC) trunk main on Watermark Way. The 10-inch diameter trunk main can be downsized to 8-inch at the intersection with the townhome mains as noted on the Lift Station Service Area Exhibit to assist with flushing velocities. A portion of the Development will be served by a lift station as shown in the City’s 2040 Comprehensive Plan, which will be oversized to accommodate the remaining sanitary sewer district 3H. Oversizing costs for the lift station will be credited by the City. The site will otherwise be served by 8-inch diameter main along with 4-inch Schedule 40 PVC