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I I I I I I I I I I I I I I I I I I I There are several unknowns concerning the new well alternative which should be discussed. First of all, at this time there are not any medium- large yield wells in operation in the Lone Tree Creek Basin near Nunn. The existing wells were drilled for the purpose of supplying water for private family dwellings, which are pumped at a 5 to 10 gpm rate since the demand is low. In other words, the potential yield of the shallow aquifer in the Lone Tree Creek Basin is not fully known. However, a U.S.G.S. publication in 1963 (Reference 8) on the "Groundwater Investigations in the Lower Cache LaPoudre River Basin, Colorado" indicates that the potential yields of the shallow aquifer I/ells in the Lone Tree Creek Drainage are approximately the same as in the Spring Creek Drainage, between 25 and 500 gpm. The U.S,G.S. report also indicates that the alluvium north of Pierce is relatively thin and w~ll yields are lower than south of Pierce, generally less than 200 gpm. The well yields in the Lone Tree Creek Drainage are somewhat lower than in the Spring Creek Drainage due to the fact that the alluvial deposits of saturated material are not as thick as in the Spring Creek Drainage. However, it is expected that wells can be constructed in the Lone Tree Creek Drainage which will produce a sufficient quantity of good quality water to replace the existing shallow wells as Nunn's principal water supply source. It should be emphasized that the exact location of the proposed wells and the verification of the potential yield and the water quality will be one of the most important aspects of the final design of the recommended improvements. Figure VI-l shows the assumed location of two wells to serve as the new water source for the Town's water supply. The enclosed Figure IV-l in the Appendix shows the approximate location of the bedrock barrier that separates the alluvium of Lone Tree Creek from that of Spring Creek and 32