2021.06.21 CC Packet - Laserfiche WebLink

Home

Feasibility Report 121st Avenue and Acres of Bald Eagle Utility & Street Improvements Project City of Hugo, MN WSB Project No. 018363-000 Page 5 4 PROPOSED IMPROVEMENTS 4.1 Utilities – Sanitary Sewer and Watermain 4.1.1 Sanitary Sewer Sanitary sewer will be extended from the Metropolitan Council interceptor sewer into the proposed development roadway and in 121st Street. The proposed sanitary sewer will be 8- inches in diameter and extend 4-inch diameter services to seven new development lots fronting Broadway Court. Two of the remaining new development lots will have one 4-inch diameter sewer service extended from the existing sanitary sewer in Everton Avenue and one 4-inch diameter sewer service extended from new sanitary sewer in 121st Street. Proposed sanitary sewer will be extended in 121st Street from about 230-feet to 1,100-feet east of Everton Avenue, with 4-inch diameter sewer services extending to eleven existing parcels fronting 121st Street. Two additional existing lots with frontage on Falcon Avenue will have sanitary sewer services extended from the proposed development roadway through a utility easement to the back-lot line. See Figure No. 4 in Appendix A for the proposed sanitary sewer and sewer service layout. 4.1.2 Watermain In conformance with the 2040 Comprehensive Plan, 12” diameter watermain will be extended in 121st Street from the existing stub at Everton Avenue to Falcon Avenue, and 8-inch diameter watermain will extend in the new roadway in the proposed development from 121st Street. A 6- inch watermain will be extended east from Broadway Court to provide water service and to two properties with frontage on Falcon Avenue. The watermains will include hydrants, gate valves and fittings and services. The new lots created by the development will have 1-inch diameter water services extended to the property line. Two of the new lots will have 1.5-inch services, one extended from Everton Avenue to the property line and one from 121st Street extended to the property line. The larger diameter services are provided since the house pads will be 200-300 feet from the watermain for these properties. Existing lots with frontage on 121st Street will have 1-inch diameter water services extended from the new watermain to the property line. Existing lots with frontage on Falcon Avenue will have 1-inch diameter services extended from the 6-inch diameter watermain in a utility easement from the new roadway in the proposed development. See Figure No. 4 in Appendix A for the proposed watermain and water service layout. 4.1.3 Storm Sewer The Acres of Bald Eagle development will have storm sewer conveyance system to collect storm water runoff from the proposed development, and discharge to on-site storm water basins. The prosed storm sewer consists of two storm drains located south of the cul-de-sac in the curb flow line to collect storm runoff and 15-inch diameter reinforced concrete pipe to convey storm water to an on-site drainage basin, discharging east of the new roadway. One drainage basin extends along the east and north perimeter of the plat, with a second small basin northwest of 121st Street and Broadway Court. The drainage basins are proposed as infiltration basins with overflow weirs on each. Two spillways are proposed to convey storm water runoff or about half the length of the roadway through swales to the storm water basins. Staff is currently reviewing the application and will provide the development team comments on the stormwater management plan. Drainage along 121st Street will continue in the existing ditches and overland as in the existing drainage condition. Stormwater management requirements for 121st Street will be accommodated for within the Acres of Bald Eagle development.