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Ms. Katie Larsen <br />08/06/2025 <br />Page 7 <br />Nature Refuge North Addition Engineering Review <br />WSB (6/25/2025) Complete <br /> <br />8. WSB (8/6/2025) The applicant shall review the water pressure at the north end of the <br />existing Natures Refuge development in coordination with City Public Works staff <br /> <br /> <br />• Sanitary Sewer <br /> <br />Sanitary sewer collection for the Natures Refuge North Addition has not yet been <br />proposed and will need to be submitted for preliminary plat by the applicant. It is <br />anticipated that the existing 10- inch diameter poly-vinyl chloride (PVC) trunk main on <br />Haywood Drive will be extended north to serve a portion of the proposed addition. The <br />remainder of the addition will need to be evaluated by the applicant as to whether a lift <br />station as shown in the City’s 2040 Comprehensive Plan is necessary. If necessary, the <br />lift station will need to be oversized to accommodate the remaining sanitary sewer district <br />2K and a portion of 2A. Oversizing costs for the lift station will be credited by the City. <br />The site will otherwise be served by 8- inch diameter main along with 4-inch Schedule 40 <br />PVC service pipe to each lot. Additional sanitary sewer stubs will be extended to the west, <br />north, and east. The proposed sanitary sewer is consistent with the with the original <br />Natures Refuge development. <br /> <br />Comments: <br />1. Connect to existing 10" PVC SDR 35 sanitary sewer main <br />a. Match existing slope <br />Carlson (4/25/2025) Note added. Existing invert and slope based on <br />proposed stub elevation from Natures Refuge. <br />WSB (5/23/2025) Complete <br /> <br />2. [Lift Station] <br />a. The lift station can be raised by 2 feet <br />Carlson (4/25/2025) Per discussion, the lift station was raised 4-feet. <br />WSB (5/23/2025) Complete <br /> <br />b. Projected peak hourly flow from 228 residential units is about 120 gpm, so 8” <br />sewers shown are sufficient. <br />Carlson (4/25/2025) Noted <br />WSB (5/23/2025) Complete <br /> <br />i. Forcemain will be 4”. <br />Carlson (4/25/2025) Noted <br />WSB (5/23/2025) Complete <br /> <br />c. Deep 35’ build at the lift station, but looks like it’s needed to serve the <br />northeast corner by gravity. <br />Carlson (4/25/2025) Noted <br />WSB (5/23/2025) Complete <br /> <br />i. Looks like about 50’ radius around wet well for excavation during <br />construction, hopefully enough unless Geotech requires shallower <br />embankment. <br />Carlson (4/25/2025) Noted. Assuming sandy soils – 1:1 minimum <br />will be needed. Easement does cover a 50’ radius from the center of <br />Page 113 of 168