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City Council N inutes <br />January 10, 2023 <br />Page 2 <br />Mr. Puga noted that the proposed annexations are significant in size and create a <br />60% increase in service area. <br />Mr. Puga noted that there are multiple wetland areas throughout the northeast, <br />section which create challenges for infrastructure installation while the northwest <br />section has wetlands mostly in its northwest corner. <br />In presenting usage projections, Mr. Puga shared that the northeast expansion would <br />generate a 23% increase in water demand while the northwest expansion would <br />increase demand by 22%. Wastewater projections show a 33% increase with the <br />northeast expansion and 32% from the northwest. <br />Mr. Puga laid out the standards of service for water service which call for specified <br />pressure, velocities, pumping, and storage to meet maximum day demands. Sewer <br />service standards describe the required flow, sewer depth, excess system capacity, <br />and velocities. <br />In the northeast area the proposed trunk water main is in the high-pressure zone and <br />would not require the creation of a new pressure zone. Mr. Puga explained that this <br />area could be served by extending the 12-inch trunk water main with looping. He <br />added that a new well would be needed in 5 to 10 years and a new water tower would <br />be needed in 10 to 15 years. It won't be known whether a treatment facility will be <br />necessary until the new well is operational, but for funding purposes it is safer to <br />assume it will be. <br />Mr. Puga stated that the northwest area will be significantly more challenging to <br />provide water service to due to elevation differences of close to 200 feet. The lower <br />pressure in the area cannot currently provide adequate volume to serve the proposed <br />expansion. <br />Mr. Puga explained that in Elk River the high-pressure and low-pressure zones run <br />independent of one another so with the system as it exists the northwest expansion <br />would require new wells, treatment facilities, water tower, trunk line, and water main <br />immediately. <br />Mr. Puga then explained a hybrid model had been developed to use pump stations to <br />serve the northwest area's high-pressure zone from the existing low-pressure zone. <br />This model would require two booster stations and a well immediately, with another <br />well required in a 5-10-year range. Mr. Puga cautioned this approach could ultimately <br />draw too much water from the existing low-pressure zone for it to maintain adequate <br />pressure for the areas currently being served. <br />Mr. Puga presented an opinion of probable cost for providing water service with the <br />northeast area totaling $31,635,000 and the northwest totaling $43,977,000. <br />lIaFIEI 1r <br />NATURE <br />