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Alan Plummer Associates, Inc. <br />Water Master Plan Update 2016 <br /> <br />The computer model was utilized to simulate future conditions and identify capital improvement <br />projects that would be needed to allow the City to continue providing a safe, reliable source of <br />potable water for its customers. Improvement projects were identified for pumping, storage, and <br />piping modifications for the 2020, 2025, and 2035 horizons. The total CIP for each period is <br />$24.5, $23.8, and $6.3 million respectively. The individual projects included in the CIP can be <br />seen in Tables 8-1, 8-2, and 8-3. It is important to note that these capital costs would be in <br />addition to any expenditure the City incurs as part of its participation in the Hays-Caldwell Public <br />Utility Authority. <br />The computer model was also utilized to evaluate water age within the distribution system. <br />Water age can be an indicator for possible water quality concerns, with higher water age <br />increasing the potential for water quality issues. In particular, the City has experienced periodic <br />episodes of elevated Total Trihalomethanes (TTHMs) in the distribution system, with levels <br />exceeding Environmental Protection Agency (EPA) criteria on a 12-month running average. <br />These elevated levels primarily occur following significant storm events in the Guadalupe River <br />watershed. The computer model indicates that water age will improve in some areas of the <br />system as demand increases and as pipe loops are closed, eliminating dead-end lines. <br />However, water age and therefore water quality may be an ongoing concern. The City is <br />currently working with the Guadalupe-Blanco River Authority (GBRA) to affect changes at the <br />treatment plant that would address the TTHM concerns. <br />Finally, an analysis of peak and annual water consumption by water meter size was conducted. <br />The results of this analysis indicate that the existing method used to determine the number of <br />Service Unit Equivalents (SUEs) based on water meter size underestimates the impact of larger <br />meters. The number of SUEs for a project is used in calculating the impact fee due for that <br />for <br />determining the number of SUEs based on peak demand is proposed in Section 8.3. <br /> <br />v <br />m:\projects\0600\022-01\doc\report\draft\draftmasterplan-v15_hef.docx <br /> <br />