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ECOLOGIC Engineering October 27, 1997 <br /> 7112 <br /> ATTACHMENT TO USE PERMIT APPLICATION <br /> FOR <br /> MOUNTAIN HOUSE WATER TREATMENT PLANT <br /> This attachment presents information to supplement the Use Permit Application forms. <br /> General <br /> The Mountain House water treatment plant will be built in stages as development occurs <br /> within Mountain House. Two site plans are being submitted: the initial treatment system <br /> (Phase 1) will provide capacity for at least the first neighborhood; and the ultimate <br /> treatment system to serve the complete buildout of the Mountain House development <br /> based on a population of 44,000 and a maximum daily flow of 20 million gallons per day <br /> (MGD). <br /> The principle components of the Phase 1 treatment system consist of a raw water <br /> pumping station and 21,000 feet of 30-inch transmission piping that will be owned and <br /> operated by the Byron Bethany Irrigation District (BBID), two parallel package type <br /> treatment units each with a capacity of 3 MGD located in a treatment building, one <br /> welded steel storage tank with a nominal capacity of 4.6 MG, and an effluent pump <br /> station. Depending upon future safe drinking water regulations, pretreatment consisting <br /> of ozonation, and post treatment consisting of granular activated carbon may be added <br /> to supplement the Phase 1 treatment system. <br /> Additional parallel treatment units similar to those provided in Phase 1 will be added as <br /> development occurs up to the maximum design flow of 20 MGD. Up to two additional <br /> storage tanks will also be added at the water treatment plant site in future stages. <br /> Water Demand <br /> Maximum day water demands projected for the first specific plan of 5.0 MGD (1.67 <br /> MGD for the first neighborhood) are reasonable and there is no basis on which to <br /> modify them at this time. As development occurs, water consumption will be monitored, <br /> and water demand projections and conservation policies modified as warranted. <br /> Raw Water Supply <br /> A new raw water pumping station will be constructed adjacent to and north of BBID's <br /> existing 1-S pumping station. The station will be designed to ultimately house four <br /> pumps: three 10 MGD pumps, one of which would be a standby, and a fourth smaller <br /> pump, most probably with a capacity of 5 MGD. Initially, two 3 MGD pumps and one <br /> 1.5 MGD pumps will be installed. <br /> -1- <br />