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summer of 2004. WWC24 was a flowing well. Initial samples displayed a Na- <br />HCO3 type water with TDS values of 640 and 820 mg /1. <br />Wolf Creek/Wadge Interburden <br />SCC installed one well (30) to monitor the interburden within the original permit <br />area. The interburden consists of 165 to 215 feet of interbedded sandstone, shale, <br />siltstone and coal, thus forming a relatively impermeable zone between the <br />underlying Wolf Creek coal and the overlying Wadge coal. <br />Monitoring data for the well were presented in the permit application. Depth to <br />water measurements at this well were made for about 22 months. This data not only <br />shows very little seasonal fluctuation, but that the interburden at this site is under <br />unconfined or water table conditions. This is not an expected characteristic because <br />both the Wolf Creek coal and the Wadge coal, at least seasonally, exhibit artesian <br />head at this site. It is possible that this well was not properly completed, or that a <br />perched aquifer was intercepted by the well. Seneca Coal Company has <br />subsequently abandoned this well. Based on analysis of the Wolf Creek and Wadge <br />coal, it is expected that water within the interburden, as in the other units, will <br />exhibit confined conditions downdip of the Sage Creek anticlinal axis. <br />No water quality sampling was done in the interburden, in the original permit area. <br />Refer to discussion related to Sage Creek overburden and Wolf Creek overburden <br />regarding sampling of strata below the Wadge seam within the south extension area. <br />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 former Pond 016A embankment. <br />The 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 />HCO3 type water with TDS values of 550 and 720 mg /1. U24 initial samples <br />displayed a Na- HCO3SO4 type water with TDS values of 1180 and 2380 mg /1. <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 former Pond 016A embankment. The well failed due to a landslide in the <br />spring of 2003 and was subsequently abandoned. Only five samples were collected. <br />WSC24 was a flowing well. Initial samples displayed a Na- HCO3SO4 type water, <br />Seneca II -W Findings Document 28 C- 1982 -057 <br />Permit Revision No. 6 January 6, 2012 <br />