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<br />04G 1 <br /> <br />the mantling dune sand and loess deposits. The alluvium consists of <br />heterogeneous mixtures of clay, silt, sand and gravel deposits. Extensive <br />lenses of clay occur within the river valley, but are more characteristic <br />of the tributary valleys. . Alluvial terrace deposits are characteristic <br />and up to six distince terrace levels have been described. <br /> <br />In general, dune sands overlie Only the outer edges of the alluvial <br />deposits and are present mos~ii~ of the river. These deposits <br />consist primarily of fine td:'medi~ sand with some coarse sand and <br />c'. <br />r- . .) , <br />some silt and clay. Loes~. a deposit of silt and very fine sand, mantles <br />{ r <br />most of the alluvial depOsits to the study area. <br />~ , <br />'- ' <br />J <br />t:.......... "J <br />In the South Platte ~i~~yY?lley and tributary stream valleys, the <br />-..,.. ''I <br />principal aquifer i'~.~he. '~iluvium. The 'Cretaceous and Tertiary deposits <br />r ' "':::. <br />, \ <br />contain relat;vely-sm~~ amounts of recoverable ground water and are, <br />therefore, not considered as aquifers. The lithologic characteristics <br />of these formations not only makes them unsuitable for sources of water <br />but aT so unsui tabl e for use as possi b 1 e recharge sites. , The occurrence <br />of these deposits under lands served by the North Sterling Irrigation <br />District precludes recharge in this area. The mantling deposits of <br />dune sand and loess are not considered as aquifers since these deposits <br /> <br />generally lie above the water table and do not yield significant quantities <br />of water to wells. <br />