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• EC-14. EC-15 Wells -Elk Creek - Alluvium/Colluvium <br />The EC-14 well is located up gradient of the EC-15 well. The EC-14 well is located in <br />undisturbed alluvium/colluvium up-gradient from the Elk Creek mine surface facility but down- <br />gradient from the eventual D seam mining azea located in the upper reaches of Elk Creek. The <br />EC-15 well is located in alluvium/colluvium located south of the D seam portal azea but north of <br />the coal stockpile azea. Changes in the hydrologic condition of shallow Elk Creek alluvial <br />groundwater due to mining activities could potentially be monitored from these two wells. <br />During 2006 water levels in the wells were variable. The EC-14 and EC-15 lab samples were <br />obtained on August 10, 2006 and the data suggests no anomalies. <br />Overall analysis of the very limited data for these wells suggest no anomalies. <br />D2B and D2B2 Mine Water Transfer Wells ("D seam to B seam") <br />The purpose of these two boreholes aze to transfer mine water from the D seam Elk Creek mine <br />workings to the underlying Somerset B/C seam workings. The depth to water is to be measured <br />at the same frequency as the overall OMLLC groundwater monitoring program. Data is also to <br />be collected regarding 1) annual total volume of water transferred, 2) representative pH of <br />transferred water and 3) representative TSS of transferred water. <br />• D2B <br />The D2B mine water transfer well was drilled and completed in late December 2004 in the <br />vicinity of the upper Elk Creek facilities azea. When the drill penetrated the B Seam workings, it <br />was apparent that this portion of the B seam mine was flooded with water. The B seam was <br />encountered at the 5918' elevation and a static water level later appeazed at the 6042' elevation. <br />Water transfer operations first commenced in eazly 2005 in D2B. During 2006, the D2B water <br />meter indicated 50,604,700 gallons of transferred water. This volume reflects the transfer of <br />water that had collected in the sump from sealed 4 West and 5 West Entries, motor cooling <br />water, dust control overspray and a short term flow of perched water inflow from the west end of <br />10 West . In addition, since the floor of the historic Somerset B Seam Mine portal is at the <br />approximate 6090' elevation, there remains approximately 43' of elevation remaining before the <br />water could exit the mine at that location. <br />D2B2 <br />The D2B2 borehole was completed in December 2005 in the vicinity of the Hubbazd Fan. Water <br />transfer started during early 2006. The bottom 39' of the borehole is uncased. Estimated flow to <br />D2B2 is 577,200 gallons in 2006. The B seam coal roof was encountered at 6046' elevation. <br />Afrer initial water transfer, initial water level was encountered at 6053' elevation, or T above the <br />coal. Subsequent measurements encountered an appazent dry borehole obstruction at the 6070.7 <br />elevation or 24' above the coal. The obstruction has not precluded water transfer, but has limited <br />the ability to lower the sounder past the obstruction. <br />• <br />13 <br />