1987-12-01_PERMIT FILE - C1981017 (176)

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I _ 02cause the m-- r.e is not dewatering the downdip area outside \• the immediate rai ne area , nor is the aquifer system being permanent) dewatered or impacted . The impacts are short lived because upon inine abandonment the working areas w11! be allowed to flood and -the recharge area to function in a more efficient manner than that which existed prior to mining . In other words , during the working of the nine, the pumping activities temporarily di-rerts hater from the recharge area , but upon mine abandonment- the recharge area will be natural); restored to a condition equal to or better than pre-uinin if the :nine . shafts sloped towards the aauif er discharge zone , a concern regarding the potential for dewater_ in_ a regional area could be raised . However , the water being pumped fron the underground workings is from the top of the aquifer , rather than from the bottom . The mining operation is t! erefcre having little or no short tern impacts on water quantity and no long term impacts on a future ground water source . See discussion of impacts on ground water quality on the following- page (12 . 1) . Another concern, though unfounded , is the possibility of adversely disturbing the flow system due to future mine subsidence . The B and Hiddie coal beds are tight , low permeable and non water bearing formations . The roofs of he 71-lnes , if subsidence occurs , will collapse into the mine -?oils . The closest aquifer to the collapse zone is the un3er' ;>iT?_ Ro ins Sandstone . The closest overlying sandstone acu'__`er unit, is separa ,-_=d fror, the B bed .bv a 32;