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wells is typically less than 100 ft. The City has water rights for these wells that total approximately 14 cfs. Conditional groundwater decrees have been acquired for the future construction of four additional wells. Water Quality of the well field is such that, with the exception of Well #4, the water need only be chlorinated before entering the system. Because filtration is required on Well #4, it is used strictly in a backup mode. The city's water system is used almost exclusively to meet potable water demands. Lawn and garden irrigation requirements are, for most of the city, met by a separate surface irrigation water system containing untreated water supplied by the Gunnison Town Ditch. Domestic water taps are metered, with the college being the largest user of domestic water. The city has no industrial customers who are significantly large water users. There is a tendency for the aquifer to be depleted through the wi nter months because of reduced recharge rates. Th is is due to frozen ground and the cessation of surface irrigation. With domestic water requirements gradually increasing, a deficiency in the ground water supply is projected for the future. Studies conducted over the past several years have been aimed at enabling the city to posture itself for development of surface water supplies at the appropriate time in order to avert a critical shortage. The latest study, completed by WRC Engineering, Inc. (1981) recommends converting to a surface water supply using the existing O'Fallon Ditch diversion on the Gunnison River below A1mont to deliver water to a new 5 MGD water treatment plant. The proposal also includes 40,000 ft of 24-inch transmission line. The city has a conditional decree (1957 adjudication) for 10 cfs of O'Fa110n Ditch water to be used for non-irrigating purposes. That recommended development has not been implemented to date because near-term water supplies are considered to be adequate. The most pressing immediate need B-29 II"! r""'!""~"65'-' U kj \J U ,.! ,:) l) I I I I 1 I I I I I I I I I I I I 1 1