|
<br />,,,,.I ~r, ,,;~
<br />,;
<br />~~~~'~~i
<br />.r.
<br />~ III iiiilllllllll III
<br />llnitcil Sttltes Ucparlment of the Interior
<br />(lhPl(;I~; Uh tillltl~'ACI? MINING
<br />1{crl,lmalion 7unl 1?nli,rcemcnt
<br />11Itf1UKti IU1V h:Itti
<br />111 _'1115111 tilRf: P'f
<br />11f NVIi R, l f11 f11t A1111 R02U2
<br />Mr, lien Kent.
<br />c.,;l I Gltpervt ;nr ?I~ 1 3 1981
<br />Mined band Ite•~_Llin~tl loo
<br />423 f.entennia 1 Ito i I di n;;
<br />13L3 She ratan S[rrc•t
<br />Uenve r, Co to radu %;'1211']
<br />NB: Colorado, 1'c•stuvu'eland, Clr,_h;lyd Valley Mine, Coal lJaste Ulsposal and
<br />Variance from A~~C
<br />Dear .iiin:
<br />.4s you are aware, wu Ivlvc been pcrfurmin+; .I join[ rr~view of the Cr.Lorado
<br />IJestlonreLand Ur,llalrl V.tl;cy i•tininl; and Ire-.Iumatlon Plau. .Iim I'enrlle[on of
<br />your s[afE and Y.r:lth P,irk uf. my .5[afF havr' been rcviaw[np, :uui :utnlyzinl; the
<br />1;entr.chnical :ISPr'~ts of thr' pL;tn. Phis I:: nn important issue because the
<br />entlrc sur'facc facllit.ies uF [he orchard !'~~ll.ey I•line are located on ;ut area of
<br />I•o[nntlnl ;,enlo~;lc 4:v.tnl as maptu:d by tlrr Colorado Geoln~ic Survey (see
<br />I'endlr~ton's m•~mnr:uldnin for reCcrulce).
<br />kevlew by Pendleton (11 I`l;lrch 191{1 mvmnrut•.luln Co Tor, Gillis) LndicnCes set'ious
<br />deficiencies In the appli+arluu with re1;.n'~I to the coal waste disposal site.
<br />P rellmtnary slope stab{ ll ty nna lysi.s by Kirk based on site-specific strength
<br />parameters and stceny,th parameters In similar material from the nearby M[.
<br />Gunnison :;ite indicnU: that even under fully dr;tlned condiCimis, the Pi Le as
<br />presently deslr,nnd -•aould have a static safety factor of 1.3. (F partial or
<br />Coll saturation uc,.n n'e~l, the pile wunlrl l~lil. (Sec ntCached s[ablltty
<br />analysis.) The vile as prescen[ly being cons[ntc[ed dues no[ contain any form
<br />nE undcrdraln and filter as required by lhllc 4.10.3 of 2 c:CK 407-2.
<br />'1'hcrc,fure, s~CUrn[ion of I:hc vile is likely over [he long, Cr.rm. It. is Chus
<br />impcratlvc• that Che. infnrmatinn requustcd iu the 3/11/81 Pendleton Letter be
<br />~:uppllcd by the nnpllu,nt. Tf Chls InformlClon is not subiniCted, {.here will
<br />be nn •way to .'lokr a Cindin{; of u,roplianuo. [t should hU noted that this will
<br />be [Ile Chi rd 1 Ina• that thin {afar+nation ,:n•. rrquestcd from [hr• applt,~.ant. The
<br />Uti`1 Irttcr of tiupt eiaber "L'I, 197') rcqucstod .t mass st.nbf 111 y an:,ly::l:; he
<br />nrrforrnrd amt thr• ~\n•;n•~,1 I?, 1'141{ i'+•ndlcloii mcmuranduw rrquo,[cd similar'
<br />LnL,rlnnt tun.
<br />11nng with the ,.onl waste pill:, the TAAIi til tPf i. Lonrernud wiCll t.h,' luug-term
<br />•ttahi.lity of the past-nii liinl; Cupul't'n phY Irl the re,. l.Iiwt•rl sn rf ace IaL1l11 ies.
<br />1'feld IIIVCSCI,':11.IUII!1 IrY 'IA/\II tit.Il I Illd lt.al,: LII:I L rnlllrrr '{lope I:Illll rr Iti
<br />pre.SOnt Ly ucuu~t in,~, at .n~v~•ta1 Iurni ions .II Clle exf;;L lot, snrfrn:n f.'lr llll lCS,
<br />,Ind tln~ presence of pa lr•o-sl ideti ,Ind col Lrr iwn Illlyd palru-, Yl:nrool:; prosenC ;,
<br />situ.tt loo whe ru fnilun• i:. Itlcrly to uc~u1' .it;;tt u. 'I'bis 1:; ~nnf lt'u~c~l by the
<br />:,t,tbllltY analY~~ls of ILI•'luwor fill a::su,.i a[ud with thr rrlu;hcr :wd olllcc
<br />
|