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Alan Plummer Associates, Inc. <br />Water Master Plan Update 2016 <br /> <br />7.2 2020 SYSTEM <br />After updating the system with the recommended 2020 projects (Figure 6-1), the water age run <br />of the system includes the following observations (Figure 7-2). Water age in the central portion <br />of the system (the main SWTP and Upper Pressure Planes) is still very good (generally < 48 <br />hours). Some of the previous areas of concern show improvement. This includes the airport <br />water mains and the Blanco Vista area (both < 48 hours now) due to increases in 2020 <br />demands. The Cottonwood EST also shows a slight reduction in water age (now 120 150 <br />hours). Phase I of the proposed La Cima Development comes online in 2020 and has a water <br />age of 24 to 48 hours. Although this de <br />water age is because all of the demand allocated to this development is fed by the proposed RR <br />12 EST and booster station which is fed by the Comanche tank, well, and booster pump station. <br />In comparison with the existing system water age run, a couple areas show a substantial <br />increase of water age in 2020. This includes the Kingswood, Estates of San Marcos/Upper <br />McCarty, and Hunter Road/Soyars areas. The Kingswood and Hunter Road areas now have a <br />water age up to almost 200 hours. This is due to the Soyars well (a freshwater source in the <br />area) being turned around to serve the first phase of the Paso Robles Development. Also, in this <br />water age run the Kingswood well is not on. Making sure this well runs periodically is a good <br />way to decrease the water age in this specific neighborhood. The higher water age in the <br />Estates of San Marcos (about 200 250 hours) and Upper McCarty (48 72) is caused by the <br />McCarty well not running in this model simulation. The Upper McCarty area feeds the Estates of <br />San Marcos in this year. Again, running this well periodically will reduce water age in this area. <br /> <br /> <br />7-3 <br />m:\projects\0600\022-01\doc\report\draft\draftmasterplan-v15_hef.docx <br /> <br />