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<br />I <br /> <br />I <br />I <br /> <br />The Colorado Department of Health has set mandatory limits for certain <br /> <br /> <br />chemical constituents in public water supplies. The presence of the follow- <br /> <br /> <br />ing substances in excess of the concentrations listed shall constitute <br /> <br /> <br />grounds for rejection of the supply: <br /> <br />I <br /> <br />Substance <br /> <br />Concentra tion <br />in mg/l <br /> <br />I <br /> <br />I <br /> <br />Arsenic (As) <br />Barium (Ba)- - - - - - <br />Cadmium (Cd) - - - <br />Chromium (Hexavalent) (Cr + 6) <br />Cyanide (CN) - - - - <br />Fluoride (F) - - - - - - - <br />Lead (Pb)- - - - - - - <br />Selenium (Se)- <br />Silver (Ag)- - - <br /> <br />0.05. <br />1.0 <br />0.01 <br />0.05 <br />0.2 <br />2.4 <br />O.OS <br />0.01 <br />0.05 <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Not only is it important to determine the existing quality of ground <br /> <br /> <br />water within each aquifer, but also to predict the changes which might be <br /> <br /> <br />expected in the future. Such changes are often dependent upon past activi- <br /> <br /> <br />ties of others and therefore outside the control of those proposing to <br /> <br /> <br />use the water. <br /> <br />I <br /> <br />I <br /> <br />Camp Creek Alluvium <br /> <br />I <br /> <br />Camp Greek is an intermittent stream tributary to the South Platte <br />River which heads in the northern portion of TIS, R53W, in western Washington <br />County. It flows generally northwestward entering the South Platte River <br />in eastern Morgan County near Hillrose. <br /> <br />I <br /> <br />I <br />I <br />I <br /> <br />Investigations of the Camp Creek alluvium included study of drillers' <br /> <br /> <br />logs of test holes and wells in the area. In addition, the Morgan County <br /> <br /> <br />Quality Water Association had eight test holes drilled specifically for <br /> <br /> <br />this study in 1973. <br /> <br />General geology and hydrology <br /> <br />I <br />I <br />I <br /> <br />The Camp Creek alluvial aquifer is underlain by the Pierre shale, of <br /> <br /> <br />late Cretaceous Age. The alluvium occupies an ancestral channel in the <br /> <br /> <br />shale. The Pierre shale ranges from 3000 to 4500 feet in thickness and is <br /> <br /> <br />essentially impermeable. <br /> <br />- 5 - <br /> <br />M. W, BITTINGER AND ASSOCIATES, INC. <br />