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~ • <br />-z- <br />seals are designed to withstand the maximum hydrologic head developed behind <br />each seal. <br />Both sealing schemes are well conceived and generalized. The final choice <br />of sealing scheme and installation of the mine seals will depend on <br />engineering characteristics of the coal, roof, and floor strata encountered <br />during mining and the quantity and quality of mine infle~.as encountered <br />during mining. .4RC0 has committed [o collecting additional geologic and <br />hydrologic data naeded for the formulation of future sealing plans. The <br />final sealing of [he mine working should be sufficient to control the gravity <br />drainage of acid and tonic mine waters. <br />I recommend that the Division approve the ammended permit application section <br />3.5.2, "Portals and >rntries". <br />nLCiyt <br />cc: R. Domingue <br />D. Shelton <br />J. Pendleton <br />J. Zimpfer <br />T. Gillis <br />Pos+ sGr~P~- <br />S~:r, l..lr...,. 37 (No, 9) sko,.l ~ <br />a~sa 6a ~efre~e„ceoQ )N ~~.~. p~eceaQ;erg <br />[1 .5 c.~s5~r,~, cI.P ~.. ~..~,c ._ rCtic`S c!- ~q~I oyls ~. <br />{~~ Sti pttlati on: ARCO COAL P1UST SUBh1IT TO THE DIVISION DETAILED PLANS FOR CAPPING <br />OF WELLS NO LATER THAN SEPTEhIBER 30, 1981. ARCO COAL 'MUST SUBMIT TO TXE DIVISION <br />DETAILED PLANS FOR TXE SEALING OF PORTALS NO LATER THAN SIX (6) MONTHS AFTER <br />COMPLETION OF THE THREE (3) PORTALS INITIALLY PROPOSED TO BE INSTALLED AND <br />THEIR ASSOCIATED DEIJATERING FACILITIES. <br />