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March 10, 2004 <br />Page 2 of 3 Pages <br />affect on the overall hydrologic balance of the Keenesburg Mine. Total dissolved solids make the <br />ground water mostly unsuitable even for irrigation (Permit, page 50). <br />Well AMW 1 is located at the northern boundary of B Pit. Static water levels, pH and specific <br />conductance for 2003 were within the last five-year range. No baseline information was found for <br />this well. <br />AM W Z, adjacent to and down gradient of A Pit, also in an area of spoil backfill, continues to show <br />sign of recharge of the water table.lt had remained dry during 1998 (elevation of 4760), had some <br />water in it during the last two quarters of 1999, and had enough water that samples could be taken in <br />2000 through 2003. By the end of 2003 it had recovered approximately eight feet, to an elevation of <br />4768. The range of pH values during 2003 were within historic ranges. The 2003 range of specific <br />conductance, 8160 to 8450, was below the last four-yeaz range of 8720 to 9750. <br />DH 96 is the most down-gradient and most northerly of the monitoring wells. Static water levels <br />were about generally lower, being a foot lower at the 4`h quarter than any reading during the last four <br />years. pH was within historic ranges. Specific conductance dropped dramatically, from ranges <br />between 1990 to 2090, to 1880 to 1800. <br />DH 122 is up-gradient from the site. Static water level and pH were within four-year ranges, but <br />specific conductance dropped to 1820 in the fourth quarter from afoot-year historic range of 2030to <br />2460. <br />Static water levels in FPW were within historic 4-yeaz ranges, but pH values rose as high as 8.4 from <br />a 4-year historic range of 7.0 to 7.6. Specific conductance, however, dropped to a 4`n quarter 2003 <br />value of 600, below the 4-year historic range of 1021 to 1248. <br />Static water level in SMW 2 have recovered to an elevation of 4759 at the end of 2003. appeared to <br />be stable at an elevation of 4758 feet. This well is located in an area of spoil backfill, approximately <br />400 feet east of the south end of B Pit. The open B Pit is hydrologically isolated from this well by a <br />clay liner. However, the static water table at this point may not fully recover until backfill of B Pit is <br />complete. pH remained in 4-year ranges, but specific conductance dropped to lows of 8320 to 8480 <br />from the 4-yeaz range of 9070 to 9680. <br />Probable hydraulic consequences of mining are described in Appendix I of the Permit (pages 46 <br />through 48). In summary, ground water sources are not expected to be affected, and existing <br />quantities of water passing through the leasehold, once the water levels have recovered, should not <br />be significantly altered. Degradation of water quality is not expected. No trends or information <br />contradict these predictions. <br />