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y J (,' <br />" 4 ~ <br />v <br />Some confusion also still exists in rrgard to_the_drain~ge.and <br />szdinlont cont_r_ol structures ~_or which riy{lts-of=r:ay_~re being.souyht. <br />Cn page IT=1 of t',ie EAf1 the se~iin°nf retar.tion structures are said to <br />slave t},L capacity to contain sediments resultingrrorn t}1' 100-;'ear <br />flood, and vn page I-16 of the EAR their average capacity is given as <br />1/4 acre foot rack. The consulte.nt's rEOart, hormvar, i~+dicatas 'shat <br />the proposed ctlErk darns would calpietaly control tSle? S-ye;r event and <br />"grzatly diminish ru~orf and sr°.dimcnt from the 10-yei,r went" p."vvidzd <br />i:hat thr' struc'tur~s arc; adequately maini:a~h~ad (se:-~ page II-?0 or' Thorne.'s <br />second quarterly report). information resolving tirac difr'erences should <br />be provi:;ed, together y+ith inFcnaetion on tFlc ne~.~ssary r.~lintetlance <br />~«.. <br />measures and t(te lriethod of disposing or' materials rCmov~d frt;m the s*_ruc= ~ - <br />tures. In addition, any applicant should be re~itldcd that the check. Sams . <br />are considered to be point sourcEJ pursuant to $~ction &G2 of the Eed?cal <br />Meter Pollution Control net Ar,.enements of 1972 a~td that an Idr•'DES p:s~,nit <br />is r:gE+ired. lie believe that ~ ".io dischar5~" p~rrlit r:itft a stantlarr; 10- <br />year 2"-hour storm exr^mpt~ion could pr-evidc a rc.=.,onable d,~gree of st;ort- <br />term envirLr~~antal protaction ..*.nd is^. r2cr~nrtnd that the Nl^oposed s~:ruc- <br />+:ures bz designed tv al~~t th~;;e r_ri~~ria. <br />T}te runoff control systsr, iliustrai~d in figure Il'-2 of the FAR and <br />Plates 3 and a of t11a consul;:ant's second quart^rly report (Cllapt2r II) <br />spaear_to shcr, Host of the e~st~:;•n_drainaae or" the mine r:aste disposal <br />arcs prot^ct:d by check dams, but therz is nc indicaiio_n of_tha fAte_of <br />dra t~-i i~~c_.a)ar~ the i~iestern sirlra v` ~e w;;u?t;'-nSent. In ~Fac.t, 4sle ;ll~~tes <br />frcri the e^giti~~r's report ap`->>r to indiczta a d;,airti:ge divide through <br />tna: nine v3s•te disposal area lei tlmu2 sho~,tittg hhere tha flo•:+s from the <br />r;estern portion Gl` the area r~i17 ile disc;:~red. If_Lhe•,•c Ss._indaad a <br />dl•3inaG2 <liVldC, by FI}"!d~i GCE; 415 '.+ill 1'ltn0il' frJ.l the ':fC+Stv'f'iS Sidv of .tih~ <br />07ii$plcn r_nt mach tha 5(?dimant ._ ~`i rl1IIP1=f COn ;.rpl 5tri1C7:4 rC'S? Fu r1:17e1?.O rP., <br />the q~.testion also arises as to T:r~ florl or rater undzrneath tha lvasta dis- <br />pasal ar%a. $'if1CC 'ti1~ Dr0~0$Z'~ m?thod QT 1!aStC disposal c5S2rilaally CCn- <br />sists o~ a v311ey.fil~, 1;hat plans: if any Plav~ Scan devuloprd `or an <br />underdrzinaga (e.g. french firain) 5yst6a? In tr,is regard, rre refer to <br />the r~o*-~l~ildation made in our c~~:r.~rtts en solid r:ssta c,'isaesal. <br />I•!e aote that runor-f 'Frrat tSle traperary coal storage/parking aced . <br />',+es t o` the $ c •mns C:u i ch ~ old and the coo i 1 oadou r foci 1 i ties i n f,he <br />valley battc:i ar•a not ,•:ddr=ssed. t!2 halie~~e that tho EAR should discuss <br />what, if ?.sly, mc~sures ;:r:'. n,3C[255arY t^ p'i'::VcnL` runof' ii"Us, YIIaSe iCdS <br />frc:r, contar.,inatin9 SLffaC?, l':71e1'S. <br />~no'i:i?rst• area o` conce~•n r~;arding crater quality i~lpacts 15 Lhe possi- <br />bil i ty al' lnc;•~ases in sal ins cy_,and gtt+et~. r.a~ier .qu,i i i;~f,; ;:u1Gms le.g. -. <br />rotals s,d r~cid_f~~t?r_ntion) resulting fl-ern Lhc propost~d ac'~ion. 'Cn+tptsr <br />II or t!r.J •scnsultan•c's secor+d quarterly r2po;t (paces fI-r2 thro.!~lh II-44 <br />sianrariz~s th~ co.~plex natural racchanisms ~:h^reby runurf c,nd s;wrnn:^lt <br />leaching th~ou~h the mine rrast~s rosy result in "sc::+~~ p~~sist~r,t alueit <br />local d~grauni:ivn of r:ai'cr quali2y...dol:;,str,;c.71 Di :Lh~ Ci~j+G~al crco q+/sr <br />i <br />