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;ecc Section 779.15 (a) Continued. <br /> <br />Revised 11/20/80 <br />The upland terrace deposits underlie most of the mine plan and <br />adjacent area, as shown on Map 15a, Kerr Mine Area Ground Water <br />Hydrology. These deposits are older Quaternary age terrace de- <br />posits which were laid down when the Canadian River was 120 feet <br />higher than it is today (Kinney, 1970). The terrace deposits were <br />distributed over a broad extent over the mine plan and adjacent <br />area at elevations above 8,200 feet; however, the original <br />terraces have been dissected into many isolated parts by erosion. <br />One of these deposits contains a perched body of ground water; <br />that is, the water in the deposit is kept from percolating downward <br />by an impermeable shale layer below. This perched body of ground <br />water discharges from the deposit at a spring in Section 22, T9N, <br />R78W. A field reconnaissance performed in the summer of 1980 by <br />Kerr Coal confirmed that this is the only spring in the mine plan <br />area which drains an upland terrace deposit. The location of the <br />spring is shown on Map 15a, Kerr Mine Area Ground Water Hydrology. <br />The stream-laid deposits occur in the intermittent stream valleys <br />which cross the mine plan and adjacent area. Unconsolidated <br />stream-laid deposits holding streams were mapped by Kerr Coal in <br />the summer of 1980, and are shown on Map 15a, Kerr Mine Area Ground <br />Water Hydrology. These deposits are distributed in non-continuous, <br />narrow lenses, and contain ground water in isolated pockets of sand <br />and gravel. Several shallow wells have been installed and moni- <br />tored in the intermittent stream valleys of Bush, Williams, and <br />Sudduth Draws in the mine plan area. <br />Information gathered during the installation of the shallow wells <br />concerning the depth of the water table and alluvium in each of the <br />intermittent draws is presented in Table 8a, Kerr Mine Area Ground <br />Water Level Data, and Map 40a, Kerr Mine Area Stream Channel Cross <br />w <br />779-29 as <br />