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January /995 Kerr Coal Company ' 1994 Annual Hydrology Report • /2 <br />4.0 MINE AREA ALLUVIAL GROUND WATER <br />Water level measurements were to be collected from alluvial well AO-2 on a monthly basis <br />during the year and water samples taken 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 Well 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 the original <br />location and was completed to a depth of 14 feet. <br />Table 1, 1994 Ground Water Statistic, presents the water quality summary for the year. The <br />mean field pazameter values and analyses parameter values for the past five years are presented <br />in Table 5, Historic Mine Area Alluvial Water Quality Data. The individual analyses of samples <br />collected are presented in Exhibit D, 1994 Mine Area Alluvial Water Quality Analyses. <br />Comparison of values over the past years have shown that alluvial ground water demonstrates <br />more variability in water quality than the overburden ground water; however no definite trends <br />are evident. The variability in water quality parameters is probably influenced by seasonal and <br />year to yeaz variations in precipitation, and the variation from year to year in the number of <br />samples collected. In October 1992 as in 1991, low water levels and the silted condition of AO- <br />2 resulted in no samples collected, but the replacement of this well in January 1993 renewed the <br />ability to monitor on a consistent basis. Figure 5, EC vs TDS Well AO-2(A), shows the levels <br />and relationship between electrical conductance and total dissolved solids. Due to the silted <br />condition of the original well, there is limited data to compare at this time, but will improve <br />with the addition of data. <br />s,i __ ~,.,y,~,p TerraMatrix Int. "P.O. Box 7740!8 "SteamEoat S n s Colorado 80477 03 879-6760 <br />