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1 <br /> <br /> <br /> <br />1 <br /> <br />1 <br />LJ <br /> <br />t <br />1 <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br />fdnurry 1 YY4 Rrn Gul Cam/unY " /YY.i .q,uuul NVdroG;w Rrpart • 8 <br />4.0 MINE AREA ALLUVIAL GROUND WATER <br />Water level measurements were to be collected from alluvial well AO-Z on a monthly basis <br />during the year and water samples takzn in October and April. This well is located in Bush <br />Draw, downstream (east) of the northern extent of Pit 1. No sample could be collected in <br />October 1992 because the well was dry (probably silted in). Kerr, in response to their <br />commitment, replaced IXrell AO-2 in January 1993 and continued monitoring and sampling this <br />well on the schedule approved. The well was replaced with AO-2A adjacent to [he original <br />location and was completed to a depth of 14 feet. <br />The mean field parameter values and analyses parameter values for the past five years are <br />presented in Table 5, His[oric Mine Area Alluvial Water Quality Data. The individual analyses <br />of samples collected are presented in Exhibit D, 1993 Mine Area Alluvial Water Quality <br />Analyses. <br />Comparison of values over the past years have shown that alluvia] ground water demonstrates <br />much more variability than coal ayuifer and overburden ground water; however no definice <br />trends are evident. The variability in water quality parameters is influenced directly by seasonal <br />and year to year variations in precipitation, and the variation from year to year in the number <br />of samples collected. In October 1992 as in 1991, low water levels and the silted condition of <br />AO-2 resulted in no samples collected, bur the replacement of this well in January I993 allowed <br />the ability to monitor on a consistent basis. <br />TrmsMarris/ACZ /nc. * P.O. Bus )Id018 * Suamhaa~ Spnng~, Coloudo 80J77 (.303J 8795260 <br />