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State Req. <br />• HYDROLOGY <br />Ground Water <br />The active mine and auger pits in the area proposed to be auger mined have <br />been essentially dry and have never required pumping. Thus no water will <br />enter the auger holes from the updip direction until the backfilled over- <br />burden placed against the angered highwall resatvrates. After resaturation <br />the local ground water system will mimic other areas in which spoils contact <br />Wadge and Lennox coal at the buried highwall. <br />Downdip from mining, there are two wells, located at the same site, which <br />will be used to monitor potential wafer quality changes effected by Wadge <br />or Lennox coal seam auger mining. These wells, located on Exhibit 7-2 of <br />the Seneca II Mine Permit, are GW-S42 completed in the Wadge coal and <br />GW-S42P1 completed in the Lennox-Wadge overburden. By continuing to <br />• sample these wells semi-annually for water quality, any gross changes in <br />water quality over time due to auger mining upgradient will be able to be <br />monitored. Similarly, well GW-S19 completed in the Wadge coal and located <br />along the west-central edge of the mine permit area continues to be moni- <br />tored for potential water quality changes due to auger mining of The Wadge <br />coal seam which started in February 1984. Because of the similarities in The <br />hydrologic setting of this area to that area proposed to be mined as sub- <br />mitted in this permit application, if changes in water quality are observed in <br />GW-519, then changes in water quality in GW-S42 and GW-S42P 1 may be <br />expected. <br />It should be noted that premining Wadge and Lennox coal seam ground water <br />is unsuitable for domestic and irrigation use and is marginally suitable for <br />livestock use (see Section I.B.2.a.v, of Tab 7 of the Seneca {I Mine Permit). <br />Mine spoils water quality as sampled at wells GW-S25, GW-526, and GW-S27 <br />indicate unsuitability for domestic and agricultural use and suitability for <br />livestock use. Thus it is likely that the proposed mining will not degrade <br />. potential ground water usage. <br />12-3-7 <br />