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Flood Control Storm Sewer Improvement District No. 2023-2 <br />07/07/2023 <br />Approximately 20' west of the intersection of 2nd Street and <br />County Road 11 <br />City of Mapleton Dylan Ensrude <br />Moore Engineering, Inc. <br />dylan.ensrude@moore <br />engineeringinc.com <br />701.551.1027 <br />651 2nd St, Mapleton, ND 58059 <br />auditor@mapletonnd.com <br />701.282.6992 <br />The 2nd Street Stormwater Lift Station is a flood protection lift station installed in 1998 that services the <br />Original Townsite and Maplewood neighborhoods within Mapleton. The lift station is a simplex <br />configuration with a 500gpm pump that discharges through an 8" PVC force main into a gated control <br />structure. During normal operation, collected stormwater flows through the lift station directly to the <br />Maple River. When the Maple River is high, the sluice gate is closed and stormwater is pumped through <br />the force main to the wet side of the control structure. The lift station was analyzed during a <br />comprehensive study of the Original Townsite and Maplewood neighborhoods, and it was found to be <br />operating at approximately 1/2 of its original design capacity of 500gpm. The current capacity of the lift <br />station (~250gpm) is less than 10% of the peak flow of the storm sewer connected to it (3600gpm). <br />Additionally, the sluice gate in the existing lift station experienced a failure this spring, which allowed high <br />river water to back up into the Original Townsite and Maplewood neighborhoods. The lift station is <br />significantly undersized, lacks redundancy for reliable operation, and therefore is in need of replacement. <br /> <br />$870,815 <br />7/06/2023 <br />7/06/2023 <br />X <br />10/12/2023 <br />10/12/2023 <br />10/12/2023