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This may be attributed to the relatively poor aquifers and the more plentiful supply of <br /> surface water. <br /> Ground water is important for augmenting streamflow in the region. However, this <br /> significance is more important at the headwaters in the mountains. The surface water <br /> quality, especially during low flow, is affected by ground water; but due to ground <br /> water's high concentrations of dissolved solids, it has a deteriorating effect. <br /> Site Specific Ground Water Information <br /> Introduction. Regional and site specific geology and physiography pertinent to the <br /> discussion of ground water resources at the Nucla Mine and Nucla East mine expansion area <br /> are discussed in detail in Tab 6. Exhibits 6-8 through 6-11 (Geologic Cross Sections A <br /> through G) graphically illustrate the site specific geology at the Nucla Mine and Nucla <br /> East mining area. In order to locate the monitoring wells cited in the following <br /> discussion, reference to Exhibit 7-1 (Hydrologic Monitoring Site Location Map) should be <br /> made. <br /> Baseline Ground Water Levels. Peabody Coal Company (Peabody) maintains and operates a <br /> ground water monitoring network at the Nucla Mine and Nucla East mining area that consists <br /> of 35 monitor wells. Each monitor well is measured for static water level on a monthly <br /> basis. The details of the monitoring program are described in Tab 15, Hydrologic <br /> Monitoring Program. <br /> The wells at the Nucla Mine (GW-N1 , GW-N1P1, GW-N3, GW-N4, GW-N5, GW-N6, GW-N8, GW-N9 and <br /> GW-Nll) have been monitored since September of 1979. Monitor Well GW-N10 has been <br /> measured for water levels since January of 1981. Three additional spoil wells (GW-N26, <br /> GW-N27 and GW-N28) and one replacement coal well (GW-N4R) were installed in August and <br /> September, 1987. Measurements for static water levels began at these wells immediately <br /> after they were completed and developed. <br /> In order to obtain specific baseline water level information at Nucla East a total of 22 <br /> monitor wells have been drilled and completed. In June of 1986, 16 monitor wells (GW-N13, <br /> GW-N14, GW-N15, GW-N16, GW-N16P1, GW-N17, GW-N17P1, GW-N18, GW-N18P1, GW-N19, GW-N20, <br /> GW-N21, GW-N22, GW-N23, GW-N24 and GW-N25) were installed. During August and September of <br /> 1987, six additional monitor wells were installed, (GW-N29, GW-N30, GW-N31, GW-N32, <br /> 7-6 Revised 04/11/88 <br />