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Matrb 2004 Keen Coal Company * 2003 Anaaa! Hydralap~ Report * CO Permit No. C-80-006 • Page 3 <br />3.0 MINE AREA GROUNDWATER (WATER-TABLE) <br />Deep groundwater occurs under water-table conditions in two primary water-beazing zones in the <br />mine azea; the Sudduth Coal Seam, and the undifferentiated overlying overburden materials. The <br />Sudduth Coal Seam is monitored at well 79-61. This well is located just north of the historic Pit 1, <br />along Bush Draw, in the undisturbed coal seam. The mine area overburden wells aze designated 79-1, <br />79-2, and 79-3. These wells are located at the north and south ends of the historic 720 Pit, adjacent <br />to what was historically the east crest of the pit. Spoil Monitoring Well SP-Ol was completed in the <br />north end of the 720 Pit area in 2001 and spoil monitoring was initiated during 2002. See Map 1, <br />Mine Area Monitoring Stations, for general locations. <br />Historical groundwater monitoring data for the coal seam and overburden wells have shown that the <br />characteris[ics of the water-table groundwater system, in terms of quality and quantity, have been <br />consistent. Given these conditions, monitoring of the mine area deep groundwater is no longer <br />required until the last two years preceding final bond release. The spoil well was monitored on a <br />quarterly basis in April,)uly, and October 2003. <br />Table 1,1003 GroxndwaterQuality Statisticr, includes a summary of the water quality data for well SP-01 <br />fc: the 2003 water year. Figure 1, Mine Area Groundwater Levels, shows the relative groundwater levels <br />for the coal, overburden, and spoil over the past five years (note that spoil monitoring was only <br />initiated during the 2002 water year). The mean field and laboratory parameter values for spoil <br />monitoring to date are presented in Table 2, Historic Mine Area Spoil WaterQualily Data. The recorded <br />measurements are contained on the field data logs in Appendix A, 2003 Pield Data. <br />MWH * 1473 Pine Grove Rd, Ste. 109, * Steamboat Springy, Colorado 80477 * (970J 879-6260 <br />U"\4T A...fWn..W H,A.ILpn~\TMi\hgl H)Aiµp Mpn <br />mnlw m <br />