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Table 1— Water Demands by Land Use Land Use Acrej ADD ... ADD (gpd) IVIDD(1) (gpd) High Density 2 Residential 4,500 9,000 27,000 Mixed Use 62.76 1,200 75,312 225,936 Golf Course NA NA 500 1,500 Public/Institutional 2.76 1,000 2,760 8,280 Total 67.52 3,400 87,572 262,716 (1) Taken from 2006 Municipal Water Supply Feasibility Study. (2) Maximum day peaking factor of 3. 2.1.3 Water Model C?em?nd Allocatior With a total ultimate residential ADD of 64,800 gpd and a total ultimate ADD of 87,572 gpd from the other land uses, the total ultimate ADD for the City of Gem Lake is estimated to be 152,372 gpd or 0.152 million gallons per day (MGD). When developing the model. the 64,800 gpd residential demand was split evenly among the 216 residential parcels and the 87,572 gpd from the other land uses were spread evenly among each parcel area as seen in the map in Appendix C. 2,2 Water Quality In addition to meeting water demand needs, a feasible water supply for the City of Gem Lake is one that meets all State and Federal regulations as well as MDH health -based rules and guidance. To determine the water quality from the two potential water suppliers. we looked at each of their Consumer Confidence Reports (CCRs). A CCR is required by the United States Environmental Protection Agency (EPA) and is an annual drinking water quality report that community water systems must issue to their water customers. Each water system's CCR can be found in Appendix D. Each report contains monitoring results from January 1 to December 31, 2020, which are the most recent published results as 2021 results are not required to be published until July 1, 2022. The results are for detected State and Federal regulated contaminants as well as some non -regulated contaminants. 2.1 White r Lake Water Quality The source of water for White Bear Lake is from four wells ranging from 476 to 970 feet deep that draw water from the Prairie Du Chien -Jordan, Jordan, and Wonewoc-Mt. Simon aquifers. The City also has an emergency use only well. Prior to being pumped into the water distribution system, the water from all four wells goes through treatment at a water treatment plant which includes chemical additions of chlorine for disinfection, fluoride for water fluoridation, phosphate for corrosion control, as well as water softening and filtration. The City's website states that they soften their water to a level of 5 to 7 grains per gallon, which is considered moderately hard water. As can be seen in their CCR, their water meets all State and Federal regulations and detected non -regulated contaminants (sodium and sulfate) are not of concern. These non - FEASIBILITY STUDY UPDATE City of Gem Lake, MN Page 3