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• c. 04.7 Hydrologv Description <br />2.04.7(1) Gr~~~_rr~dwater Infor•maticrr~ <br />The forrnati~~ns which ar•e exposed in the area _~f <br />investigation (Cliff House Sar~dstor~e and Menefee FormatiorJ <br />ar•e riot cc~r~sider•ed adeq~.rate aq~_rifers beca~_rse of their p~-~~r• <br />porosity ar~d lack of contir~~.rc~us permeability. The physical <br />characteristics _~f tl-~e_~se Porraat i~~r~s ar•e described ~.ind er <br />c. G4. E(c) lJndergro~_n•~d Mining. These format icrris have also <br />beer. breached by er~~sior~ b~-nth ~_rp- ar~d dc~wr~dip from the area <br />_~f investigation and th~.rs have n~~ water retention <br />capability. <br />The massive sar~dsstor~e rnernber cif the ~_rr~~der•lyir~g F~c~ir~t Lo~~k~r~.it <br />• Sar~dstor~e is considered a pc~te~ntial aquifer. F'~~r~~sity and <br />per•rneability ar<~ yer~erally good. Recharge ..f the aq~_rifer is <br />al~~ny the _~utcrop which is approximately four miles to the <br />north of the mine area. This rnernber of the F'oint Loy=~kout <br />Sandstc~r~e is separated fr•~~rn the =•:er~lyir~q rnir~eable coal <br />seams 6y generally irnpermea6le clay shales _~f the L~~wer <br />Menefee Fc~r•rnat i~~r~. The lower rnernber• of 'the F'air~t Lc~-~k.o ~_rt <br />Sandstone lacks the p~~r~.-~sity and permeability to be <br />considered a potential s~~~.rr•ce ~~f water. <br />The Mar~c~~s Shale, which crrider•lies the F'~~ir~t Lroko~.rt <br />Sandst~~ne, is almost t~~tally irnper•rneable except where <br />fractured. <br />• Paselir~e q~.iality deterrnir~atior~s ar•e peridiriy ar~d will 6e <br />~, ir4-17 <br />