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Wolf Creek Overburden/Underburden <br />Wells WWCOV24 (overburden) and WWCU24 (underburden) were drilled in <br />August 2001 in the II-W South area adjacent to the Pond 016A embankment. The <br />wells failed due to a landslide in the spring of 2003 and were subsequently <br />abandoned. Both were flowing wells. Initial OV24 samples displayed a CaMg- <br />HCO, type water with TDS values of 550 and 720 mg/1. U24 initial samples <br />displayed a Na-HCO,SO, type water with TDS values of 1180 and 2380 mg/l. <br />Replacement wells (WWCOV25 and WWCU25) were drilled in the summer of <br />2004. <br />Sage Creek Coal <br />Mining of the Sage Creek seam began in September 2003, in the south extension <br />area. Well WSC24 was drilled in August 2001 in the II-W South area adjacent to <br />the Pond 016A embankment. The well failed due to a landslide in the spring of <br />2003 and was subsequently abandoned. Only five samples were collected. WSC24 <br />was a flowing well. Initial samples displayed a Na-HCO,SO, type water, with TDS <br />values of 770 and 1190 mg/1. A replacement well (WSC25) was drilled in the <br />summer of 2004. <br />Sage Creek Overburden <br />Well WSOV24 was drilled in August 2001 in the II-W South area adjacent to the <br />Pond 016A embankment. The well failed due to a landslide in the spring of 2003 <br />and was subsequently abandoned. Only five samples were collected. WSOV24 was <br />a flowing well. Initial samples displayed a Ca-Mg-HCO, type water, with TDS <br />values of 660 and 760 mg/1. A replacement well (WSOV25) was drilled in the <br />summer of 2004. <br />Wadge Coal <br />The Wadge coal was the principal seam of interest within the original permit area, <br />and was also mined in the south extension area. It is typically 11 to 13 feet thick, <br />except where split by partings. <br />The Wadge coal outcrops along the east side of the permit area. These outcrops <br />and perhaps a portion of the overburden east of the permit area, are thought to be <br />the major source of recharge to the Wadge. Depth to water and water quality are <br />monitored at five sites within and adjacent to the permit area. The varying <br />amounts of head measured at these wells again indicates that the major component <br />of flow is to the west. The amount of head within the Wadge, as in all the units in <br />Seneca D-W Findings Document 35 June 12, 2006 <br />Permit Renewal No. 5 <br />