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4.l>5. ~~ Water Quality St ar~dar•ds grid Effli_rer~t Lirnitat 3nrrs <br />• <br />The plan for pr•otectior~ ar~d control of dr•air~age ar~d sedirner~t <br />described in Sect>.on C.~iC,G provides that s~_rrface drainage <br />fr•r_~rn the disturbed ar-~ea within the per-rnit area will be <br />passed thr•c~i_tgh a sedir~ter~tatior~ c~~r~tr•ol str•~_rctur•e. This p~~r~d <br />will be constructed and rnair~tained tc~ safely cc~ntair~ the <br />vol~arne design criteria for a 10-year, ~4-ho~.rr• precipitation <br />event. The q~.rality c.f water and accurni_nation c.f sediment in <br />this pond will be monit_~r•ed per•>.~~dically. In addit>.nn, grab <br />samples of water will be collected fr~~rn the pc~r~d ar~d its <br />discharge t~=~ meas~_tre the effectiveness ire meeting the <br />applicable Colorac;o and Federal Water GL.iality Standards. <br />• Drar.nage from the raining facility area, after trea~tmer~t ire <br /> the sedirnentatic~r~ pond, >.s nc;t anticipated to exceed the <br />effl~.tent lirnitat.ior~s ~~f any C~~lr_~rado agency req~_tirernents. <br />No water i~~ ar~ticipa'ted tc~ be discharged fr•~~rn the <br />~_rndergr•~~~.rr~d mine. t_ik.ewise, no acid rn>.r~e drainage ~=~f pH <br />eq~.tal t_~ or• less thar~ 6.~> is expected. T.. date, r~o water- <br />has ever been discharged fr•orn the ~:~ld w~~r•1=. r.nys ~~7= the f~~rrner <br />Peacock L'oal rni rye, even th„~.rgh r~tir~ir~g has 6eer~ c~~r~d ~.rct ed <br />since 19U5. <br />4.u5.3 lliversi~.ms ar~d Conveyance ~.f Overland Fl:~w and <br />S'hal low_ Gro~.indwater Flow, and E~pherneral Streams <br />Grainir~g a Watershed Less Than One Sg~.rare Mile <br />The dr•ainaye and sediment contrr_~1 plan described in this <br />• Section provides f~=~r• ter~tporar•y diver•si:~r~ ~~f s~_rr•face <br />4. U:~-.~ <br />