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Section 779.15 (a) Continued. <br />• <br />Revised 11/20/80 <br />and shales of the Coalmont Formation comprise the overburden above <br />the coal seam. As shown in Exhibit 22a Drill Hole Logs, the coal <br />aquifer is confined by shale layers above the coal. An aquifer is <br />considered confined when artesian pressure forces the piezometric <br />level (or water level in a monitor well) above the top of the <br />aquifer strata. As shown by the water levels on Maps 7a-14a, <br />Geologic Cross-Sections, the coal aquifer is unconfined in the <br />immediate outcrop area, but becomes confined a short distance <br />down-dip from the outcrop. Further evidence of confined aquifer <br />conditions down-dip from the outcrop are year-round artesian water <br />levels in monitor wells (see Table 8a, Kerr Mine Area Ground Water <br />Level Data) and data from pump tests (see Exhibit 54, Aquifer Test <br />Data). The coal aquifer has an average thickness of 50 feet in the <br />mine plan area, as stated in Section 779.14. <br />Known Uses of Ground Water <br />• Ground water in the mine plan and adjacent area is used for in- <br />dustrial and domestic supply. Only one well which was installed by <br />Kerr Coal, shown on Map 15a, Kerr Pfine Area Ground Water Hydrology <br />in Section 35, T9N, R78[d, is known to exist in the mine plan and <br />adjacent area. This well, which operates under Colorado Well <br />Permit No. 020253-F, is used for washing equipment and showers. <br />The well produces water from a sandstone layer 26 feet thick at a y <br />depth of 160 feet, which is located stratigraphically above the /\ <br />overburden to be mined. No supply wells are completed in the <br />aquifers of the upland terrace deposits, the stream-laid deposits <br />or the Sudduth coal seam in the mine plan and adjacent area. <br />One spring, shown on Map 15a, Kerr Mine Area Ground Water Hydrology, <br />has been developed for stock watering in Section 22, T9N, R78W. <br />This spring, as described previously, issues from an upland terrace <br />deposit which holds a perched body of ground water. This is the <br />only developed spring in the mine plan and adjacent area. <br /> <br />779-32 as <br />