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Riverstone South EAW January 2021 <br />appropriation permit if dewatering required for installation of utilities exceeds 10,000 gallons/day or <br />1 million gallons/year. If construction dewatering does not exceed a total of 50 million gallons and <br />one year in duration, the project proponent will be eligible for coverage under the amended MN <br />DNR General Permit 1997-0005 for temporary water appropriations. The extent and duration of <br />temporary construction dewatering needed is currently unknown. Construction dewatering may be <br />unnecessary. Groundwater appropriated for construction dewatering will be discharged to temporary <br />sediment basins within the project area. It is not anticipated that construction dewatering will be <br />extensive or continue long enough to affect nearby domestic water wells. <br />Well Abandonment <br />The project area does not include any existing registered wells according to the Minnesota Well <br />Index (Table 5, Appendix C). However, one unregistered well was found in the southeastern corner <br />of the site during the land survey for the property. The project proponent is determining whether this <br />well has been abandoned, and will ensure the well is abandoned in compliance with MDH <br />requirements prior to project construction as noted under Item 11.a.ii. <br />Connection to a Public Water Supply <br />The project will be connected to the City of Ramsey municipal water supply. The City of Ramsey <br />draws its public water supply from the Tunnel City-Wonewoc aquifer. The City currently maintains <br />eight municipal wells that are all located at least one mile east of the project area. These existing <br />wells have a permitted capacity to pump 850 million gallons of water per year (MGY) based on <br />Minnesota DNR water use data (Table 6). <br />Table 6. City of Ramsey Municipal Water Appropriation Permits <br />Permit No. <br />Well No. <br />Permitted Volume <br />(MGY) <br />Average Use <br />2013-2018 <br />(MGY) <br />Maximum Use <br />2013-2018 <br />(MGY) <br />1985-6005 <br />161441 <br />850 <br />113.8 <br />144.3 <br />1985-6005 <br />416183 <br />850 <br />0.9 <br />5.5 <br />1985-6005 <br />580303 <br />850 <br />88.2 <br />164.9 <br />1985-6005 <br />580313 <br />850 <br />124.2 <br />194.0 <br />1985-6005 <br />593672 <br />850 <br />56.3 <br />82.3 <br />1985-6005 <br />706840 <br />850 <br />122.9 <br />138.1 <br />1985-6005 <br />743832 <br />850 <br />89.1 <br />161.6 <br />1985-6005 <br />743833 <br />850 <br />51.5 <br />129.9 <br />Total <br />646.9 <br />1,020.6 <br />During 2013-2018, these wells used a combined average of 646.9 MGY, indicating an average <br />available unused permitted volume of 203.1 MGY. Based on past use and permitted capacity, the <br />existing municipal wells have sufficient surplus capacity to serve the proposed project. A trunk water <br />main will be extended from Riverdale Drive to serve the development area. Water flow, pressure, <br />and storage will be adequate to serve the development area. As indicated under Item 11.a.ii, the <br />project is not located in or near a wellhead protection area. <br />17 <br />