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Cit�r Council iVlinutes Page 2 <br />January 10, 2023 <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 noYthwest corner. <br />In pYesenting usage pYojections, Mr. Puga shaYed that the northeast expansion would <br />geneYate a 23% increase in water demand while the noYthwest expansion would <br />incYease demand by 22%. Wastewater pYojections show a 33% increase with the <br />northeast expansion and 32% from the northwest. <br />Mr. Puga laid out the standards of service foY water service which call for specified <br />pressure, velocities, pumping, and storage to meet maximum day demands. Sewer <br />service standards describe the required flo`v, sewer depth, excess s�-stem capacity, <br />and velocities. <br />In the northeast aYea the pYoposed trunk water main is in the high-pYessuYe zone and <br />would not require the cYeation of a new pressure zone. i��. Puga explained that this <br />aYea 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 �rears and a new wateY toweY would <br />be needed in 10 to 15 �rears. It ��on't be known whethe� a treatment facilit�r will be <br />necessaryr until the new well is operational, but for funding puYposes it is safeY 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 loweY <br />pYessuYe in the area cannot currentl�� pYovide adequate volume to serve the pYoposed <br />expansion. <br />iVlr. Puga explained that in Elk River the high-pressure and low-pressuYe zones run <br />independent of one another so with the system as it e�sts the noYthwest expansion <br />would require ne�u wells, treatment facilities, water tower, trunk line, and water main <br />immediatel�r. <br />Mr. Puga then explained a hybrid model had been developed to use pump stations to <br />serve the northwest area's high-pYessure zone from the e�sting low-pressure zone. <br />This model would �equire two booster stations and a well immediatelyT, with another <br />well required in a 5-10-year range. Mr. Puga cautioned this approach could ultimately <br />dYaw too much water from the e�sting low-pressuYe zone foY it to maintain adequate <br />pressure for the areas currentlyT being served. <br />Mr. Puga presented an opinion of probable cost for providing water service with the <br />northeast aYea totaling $31,635,000 and the noYthwest totaling $43,977,000. <br />rowEREo er <br />���V�� <br />