Res 2016-137/approving a Water Master Plan to guide the future maintenance and extension of the City’s Water Infrastructure

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Alan Plummer Associates, Inc. Water Master Plan Update 2016 7.3 2025 SYSTEM After updating the system with the recommended 2025 CIP List (Figure 6-2), the water age run of the system includes the following observations (Figure 7-3). Water age in the central portion of the system (the main SWTP and Upper Pressure Planes) is still very good. The central city part of the SWTP Plane is generally less than 48 hours and the central part of the Upper Pressure Plane is less than 72 hours. The most significant change to the 2025 system is the expansion of the proposed Paso Robles Development which will include a new EST (Trunk Hill) and a booster pump station and connection to the La Cima Development. Paso Robles has an average water age of 72 to 96 hours. Introducing the connection from Paso Robles to La Cima increases the water age in La Cima to widely varied range (72 200 hours) lower in the west and higher to the east. However, as stated previously, this connection is important to provide redundancy and operational a PRV on the Paso Robles to La Cima pipeline. This connection reduces the water age in the Estates of San Marcos to 48 to 120 hours. The changes to the 2025 system also included reducing a short rate more independently (Subchapter 6.2). It is possible that this could be accomplish by partially closing one or more valves on this line. This change does increase the water age of the Upper McCarty Plane (72 to 120 hours). In this scenario, water age is reduced in the Soyars/Hunter Road area (48 to 96 hours) to a medium range. This is due to the increased demands in this area as well as the completion of more sections of the Old Bastrop Highway mains and projects which complete the loop to the Soyars area (McCarty-Tanger Loop). 7-5 m:\projects\0600\022-01\doc\report\draft\draftmasterplan-v15_hef.docx