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4.0 Water System Performance Criteria <br />This section of the report forms the criteria for evaluating the existing water system, its ability to meet <br />future demand, and opportunities for efficiency in infrastructure and operations. These criteria provide a <br />framework for the analysis of past, current and projected populations, historical water use, categorical <br />water use, peak demand use, water policy, and capital improvement plans. A glossary of frequent <br />terms for water system design and planning is located in Appendix E. <br />4.1 Design Period <br />This evaluation is based on conditions anticipated through the year 2030. This design period was <br />chosen as the most recent city comprehensive plans detail projected capital improvements through <br />2030. Since the costs of a joint system are compared to the cities' individual capital improvement plans, <br />it is necessary to follow the same timeline. <br />This report should be updated at least on a ten year basis in conjunction with master planning and <br />reviewed every five years for adjustments prior to any major capital expenditure, to ensure that <br />outcomes are based on the best Information available at the time. Deviations from expected <br />development will occur and should be accounted for in planning for and execution of a joint system. <br />4.2 Planning Area <br />An important aspect in the analysis of the joint water utility system is the area included in the planning <br />process. For the purposes of this preliminary study, the planning area is defined as the six -city area <br />within the boundaries of Centerville, Columbus, Circle Pines, Hugo, Lexington and Lino Lakes. The <br />planning area is depicted in Figure Al. <br />Note that the planning area has a significant impact on the outcome. Different combinations of cities <br />may be desired for a Joint Utility. For example, Columbus is spatially removed from the other cities and <br />this fact impacts costs related to trunk watermains considerably. In addition to this, Lexington already <br />receives treated water from Blaine and Circle Pines filters its water while the remaining communities do <br />not filter their water. This creates the possibility that mingling filtered and unfiltered water will result in <br />unanticipated and undesirable interactions. A study (Study 1 in the recommendations) to determine the <br />results of mixing these waters should be done before finalizing any Joint Utility agreement and <br />determining member cities <br />4.3 Population <br />Water use is closely linked to population so the accuracy of predicted water demand largely depends <br />on the accuracy of population projections. Population projections are comprised of City reported <br />projections and the Metropolitan Council's Thrive MSP 2040 forecasts. The City's current projections <br />from their 2030 Comprehensive Plans were used unless they differed greatly from the Thrive MSP <br />2040 forecasts. In that case, the Thrive MSP 2040 forecasts for 2030 were used instead. Population <br />across the six -city area is expected to increase 50% from 2013 to 2030. Figure 4.1 and Table 4.1 <br />summarize current and projected populations served by the water system. Please note that the City of <br />Columbus currently serves a very small portion of their residents with potable water. <br />Joint Water Utility Feasibility Study 13 <br />