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<br />/ <br /> <br />- <br />, <br /> <br />C!> <br />C <br />.- <br /> <br />. ~~~:'S: <br />,.,,; <br /> <br />SOURCES OF PARK SERVICE WATER SUPPLIES <br /> <br />Dakota Sandstone <br /> <br />At the Park Service proposed well site, the <br />Dakota will be topped at a depth of about 252 feet, as <br />indicated by an apparent dip projection of 5 from the <br />King well (figs. 2 and 4). The base of the Dakota is <br />at a depth of about 600 feet. By fully penetrating the <br />Dakota, a well at this site probably will yield more <br />than 15 gpm with sustained pumping. Pumping lifts for <br />quantities of water needed by the Park Service probably <br />will be less than 200 feet below the land surface. The <br />iron content probably will be the most serious problem <br />because of its corrosive and staining effects on <br />utility systems and clothes. The chemical quality may <br />be improved over that of the King well by sealing all <br />carbonaceous shale and coal beds from the production <br />zones. The King well produces from about the upper 75 <br />feet of the Dakota, which contains carbonaceous shale <br />and coal beds. These beds may be contributing much of <br />the undesirable chemical substances. <br /> <br />Surface Water <br /> <br />The Smith Fork and Iron Creek are perennial <br />streams. Samples of water from these streams were <br />tested in the field for dissolved solids and hardness 1 <br />the tests were made at a time when much of the water <br />was being derived directly from snowmelt, presumably <br />when the water would be of the best chemical quality. <br />Iron Creek water in the vicinity of the Crawford <br />Reservoir had from 1,000 to 1,300 ppm dissolved solids <br />and from 700 to 900 ppm hardness. Water draining <br />surficial materials on the east side of Iron Creek <br />contained 1,300 to 1,500 ppm dissolved solids and had <br />a hardness of 1,000 to 1,200 ppm. Water from both <br />places contained excessive amounts of dissolved solids <br />and was too hard for domestic use. Water in the Smith <br />Fork immediately upstream from the Iron Creek confluence <br />contained 800 ppm dissolved solids and had a hardness of <br />500 ppm. This water probably will meet U.S. Public <br />Health Service standards. The chemical quality of water <br />in the Smith Fork generally improves upstream. <br />