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<br />IX-2 <br /> <br />YOUnqer EOlian Sand and Silt <br />Extensive deposits of wind blown sand and silt are found southeast of the <br />South Platte valley. <br /> <br />transient storage between Cllatfield Reservoir and the t9th Street gaging <br />station in Denver (Wright, 1968). From 19th Street to Brighton, the <br />groundwater within the alluvial aquifer of the South Platte River isap- <br />proximately 300,000 acre.feet {Bittinger, 1968}. The 19th Street gaging <br />station is the boundary between Water Oistrict Nos. 8and2of Irrigation <br />rlivisionNo. tas administered by the State Engineer of Colorado. <br /> <br />Post-Piney Creek Alluvil.!11 <br />The deposits found within the modern floodplains of the South Platte River <br />and the alluvial mat,>r1als along thl' trihutarycreeks are Post-Pi neyCreek. <br /> <br />Sand and Gravel Resources in Adams County <br />The entire alluvial flOOdplain of the South Platte River through Adams <br />County is comprised of sand and gravel suitabh and desirable for mineral <br />extraction. These South Platte River corridor resources range up to 70 <br />feet in depth and average two miles in width along the rher in AdlrTlS <br />County. <br /> <br />Development of the South Platte alluvial groundwater resources in Water <br />District No.8 (01atfield to 19th Street) is accomplished via wells con- <br />structed for municipal, irrigation and other purposes. There are nearly <br />100 alluvial wellS in this reach which Mvebeen used for water table mea. <br />surements between 1954 and 1976 (Hillier, 1983). <br /> <br />The aVf'rage potenti ally extractable qua~ti ty of ~ggregate a"lQunt to <br />73,000,000 cubic yards per mile of river valley in Add{l1s County. <br /> <br />Downstream of 19th Street to Baseline Road,alluvial grOllfidwaterdevelop- <br />ment along the South Pl ~tte River has been extensive. A survey of all <br />alluvial wells in Jll of Water District No.2 perforrned in 19681isted <br />1,552 irrigation well ~egistrations having an averaqe yield of 1.8 ds eJch <br />(Bittinger, 1968}. In addition, Bittinger estimated that there were an <br />addl t ional 250 com:nerci al, indust~i al and munici oal well'i having dn average <br />yield of approxirnately 0.5 cfs each. Between 19th Street ~nrl Basf'line Road <br />8itt Inger estimated t~at the averaqe pumping withdrawals from this portion <br />of the river alluv;"tn amounted to 40,000 acre-feet per year. <br /> <br />Turner (1974) has est irn~ted that due to various I and use constraints, 5uch <br />as urban development, extr~ct ion of the reserves will be 1 imited to about <br />two-thirds of the potentially extractable quantities, or roughly 50,000,000 <br />cubic yards per mile of river valley, !lased on a 8righto~ quadrangle map <br />detailed study. <br /> <br />The South 1'1 atte River corr idor th~ough Adam, Goun ty is one of the 1 ast <br />large remaining Denver metropolitan area sources for gravel according to <br />the the Colorado Geological Survey. <br /> <br />Groundwatpr and grav"l pit ~toragf' in th,. South Platte Rhf'r alluvitJITI pro- <br />vides a major source of water for the City of Thornton. Thiss<ll11eaguifer <br />is the water supply for the City of Brighton. <br /> <br />GROUNOWATER RESOURCES <br />Th~ trdnsi~nt groundwater storage in the alluvia1 aquifer of tM South <br />Platte River between Chatfield Reservoir and 8~lghtrm total approximately <br />330, 000 ~cre-feet. Of this total, aDprOX imatel y 30,000 acr,"-feet are in <br /> <br />Depth of Water Table <br />The water table adjacent to the mainstem of the South Platte River, from <br />Sand Creek to Br i ghton, is des ignated by the U. S. GeoloQ ic al Su~vey <IS <br />heing less than 5 feet deep. Surrounding, and arlj~cent to this <,one of <br />Shallow w~ter, and along the full reach of the river in the floodDlain, the <br />wdter table Is designated ao: being from 5 to 10 feet deep. Al o~g the right <br />