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Granvia Preserve – Preliminary Plat/PUD Development Narrative 6 <br />Infrastructure Details <br />Streets <br />• 28-foot-wide local roads with concrete curb and gutter with parking allowed on one side. <br />• 60-foot-wide right-of-way to accommodate the roadway and utilities such as watermain, sanitary, and storm <br />sewer. <br /> <br />Water System <br />The proposed development will tie into the existing city watermain infrastructure. This will be done by tying into the <br />mainline within 50th Street North and connecting onto the stubbed mainline in Linden Avenue North inside of the St. <br />Croix Sanctuary Development. By making these two connections, the watermain will form a new loop connection <br />through the development. The proposed development will also provide a stubbed watermain line to the west side of the <br />property so that adjacent parcel could tie into the City infrastructure when it is developed. <br /> <br />Each home in the development will be connected to the City’s water system via an individual water service line. In <br />addition, each lot will be connected to a communal irrigation system served by a stormwater reuse pond. Supplemental <br />irrigation water may be provided by the City of Lake Elmo’s water supply, when necessary, in accordance with the City’s <br />recommendations. <br /> <br /> <br />Sanitary Sewer and Septic Treatment <br /> <br />The proposed development will utilize a gravity sewer system that flows toward the center of the development, where it <br />enters a lift station and is then pumped into a communal septic system serving the entire development. The communal <br />septic system will be maintained by the HOA and designed with features such as: <br /> Multiple septic tanks for solids separation <br /> Gravel filter system for initial biological treatment <br /> Drain field for further filtration <br /> Additional chemical treatment and aeration to meet code requirements <br /> Reserve areas <br /> <br />Stormwater Management <br />The natural rolling nature of this site facilitates the design of storm ponding and infiltration systems. The storm design <br />will allow for a treatment train of ponding, swales, and infiltration areas to clean and reduce the impacts to the existing <br />natural wetland features of the site. The storm sewer ponding facilities will be designed to meet both the State and <br />Watershed requirements for infiltration and for rate of runoff. A stormwater pond is being proposed on the site as a <br />source of water for a stormwater re-use system to meet requirements set by the City of Lake Elmo.