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1 <br />' 2.2.2.3 Bedrock Water Level Data Hydrographs for the 26 bedrock monitoring holes are <br />contained in Appendix D. Table 2-2 contains a statistical summary of the water level data from <br />' each of the 15 bedrock monitoring holes. The locations of the holes are shown on Plate 1 in the <br />pocket of this report. As noted in the original Deserado Mine permit application, the three zones <br />t being monitored (upper sandstone facies, siltstone and coal facies, and the lower sandstone) <br />identity three different stratigraphic zones which lack the characteristics of typical aquifers, The <br />strata are tight as demonstreted by pumping tests. <br />The 'upper sandstone facies' hydrographs, designated by the hole name ending in 'U' are water <br />' level depths in feet overtime. Monitor hole 2-17U, located immediately over the East Mains, was <br />mined under during November of 1985. The average water level dropped about 3.4 feet from the <br />previous year. Longwall Panel 1 (LW-1) was mined to within about 900 feet of this location in <br />February 1988. <br />Monitor holes 2-7U and TW2-7U are located on the same location. Although the water levels in <br />' the two holes have been comparable, fluctuations and trends in each hole have in the past been <br />quite dissimilar. A longwall gateroad (4th East) was developed past this location in June 1988. q . <br />' No holes were encountered, however, there was wet ground in the area after mining. The area <br />later dried. Longwall panel 3 was mined past this location in April 1990. The next TW2-7U <br />reading after that (6/21/90) showed a water level drop of almost 80 feet. The water level in 2-7U <br />' eventually showed a drop similar to, though of much smaller magnitude, that shown by TW2-7U. <br />After the drop, both holes exhibited a rising trend. Longwall panel 4 was mined past the location <br />' in August 1991, with no apparent immediate response from either hole. During this monitoring <br />period both holes were found to have a dry obstruction, 2-7U at 127 feet and TW2-7U at 157 <br />feet, Ground movement between the two longwall panels north and south of this location may <br />' have caused a kink in these holes. <br />' Monitor hole 36-2U was mined past in a gateroad during August 1993. There are numerous drill <br />holes at this location and one hole was encountered during mining. The hole encountered <br />underground was seeping at the measured rate of 0.25 gallons per minute. It is not known 'rf the <br />' hole mined through is one of the monitor holes (36-2U and 36-2L) or one of the exploration holes <br />drilled on this location. During this water year 36-2U showed an increase of about 4.4 feet <br />compared to the maximum water level of the previous monitoring period. <br />' The 35-4 site is located within longwall panel 7 and was mined through in October 1994. Monitor <br />' hole 35-4U now shows a dry plug at 232 feet, probably a kinked or sheared casing. It appears <br />unlikely that 35-4U will provide useable data in the future. Monitor hole 4-20U showed a slight <br />increase in the water level. <br />' 8 <br /> <br />