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P-5 P•5 2 These wMmmial grologic diRemraea art not WJrened in the DEIS. Withom further research, the risk o(subsdertm cannot be exnapolalcd from the fnraghi study. Anew, JruJeJ she slxcife Wady of the proposed ncliun eJdresaing the abo+x conums must be undertaken. and the iafonnmion and dace made available for public comment prior m approval of the pmpokd action Pd.3 Cnmmmu The DEIS Does Nor Addreu the 195f Canscreph)c Subaldenee at Wledser Slk In 1e5i, the Windsor brine field wv subjecud tp causlmphie subitdmce when a portion ufnc~ brine fnlJ>ubsidrd 25 feet uitlsin 24 hours This subsidenn e>rnt Buses caused by e Ixk of well integrity sent the upwwd migration o(the leaching Duids into Ihr o>mlytng Wrens The DEIS don sat address what, if my, pmmnire nxarwes will be liken to ' pmrnt a similar occurrcxe m Yadee Gulch. Given r)x nwrc sable gmlupy at kk'indsor, the proposed action by.4medcan Soda poses subnontial risk of cetuwphic subsideroe, and thenforc, unxcepuble environmmml risk. P•5.4 Cumstwrtt 1 Bes! Ava)lable Terhrwlogks Fer Pndictln{Sabsidence Nal Urilned iv Pnpsrutop of Ihr DEIS Chapters? end J of the DEIS elk two documenu provided by ggapito Auociates Inc D An CraNesion of Sfebiliry eM PotcnYd Em imnmrmal Impart of the C'ommcmml Suhnion Mining Plan. and 2) Swfxe Subsidenn. Realisuc Scrnuriu> Given the subswntial mrimmnentpl risks of the Reposed oven. std since the tmhnoloCY enuu to model n whthon mining field through o .cries nl'cnmples enmpunr genemrcd calculmians, a liknturc search is no longer sccepuble when pmbeting the rate of sulssdexe of the ovenll snbilily ofesolution mining Rcld Besud on ow esperiena wing romputtt modeling perfutmeJ un our mmmemidly operational brine Leld, the fallowing methods should be followed b'the applicant in creation of • new, site speci0c Duel). The uuJy wAI RuriM tlk public with a rise specific suixtural model Thal trill oudine the prcdincd ink of subsidence for the Vankn GWCh project. In con)tmctiun wish the rock meehonics ssudy' conducted by A{apim k Associates, the mcOwds we. • AF'n'm Element Anelvsis to predin the subility ofthc mining pmiect and ureic a sik Specific prajtttion n(a iubsidentt ran which could h expenrd d the proposed action Is approved. • Crean a Se~smie Rnel'n hdhrc en) alu[ion mining ocean to form a peologicat base tin sins repeated on e7evly bah m rhpn the yruuth of the eavcros mtd to eompart the geuW dnelupmem with the capnted d<velupnxnt of dx cav'env proposed m stipWand in the pmpokd xtion. Undl tlxx sluJis ere completed, the DEIS is inrompltrc and the public should have edditioml time m comment aBu the nsWts an mode public. Page 2 r~ LJ P•5.5 cmm~,ent 5 Innraetlon el Allvly{ fluids agd Overlylvg Rork Ssnsa WIII Caute Higher SuMldenee chap Projected in she DEIS Based On 80 yeas of salmion mining e<Rrience and the lack of aite•speciBc studies rclvunC to Yprtkn GWch the incomplete diulmure o! the Agvpilo study. oM the substantially JiRrrcnt gevloghs 6etwttn the Windsor and Yankee Catch sires. lie coroludc that wlutton mining Buids mew inrerxt with th<osxrlying rack pmts ¢nd aquilers to rauu a signihcrmdy grcekr rem of subsidetxe at the Yankee GWch project site. The DEIS provides rtes sire-spccifc stadia which support the subsidence projection m presented in the DEIS. P•5.6 C^mmmrb Advenelmp.ctere Fuson Miveabdgryoffyil Shale Already Underrbed Pape 4-) of the DEIS suta.'Sime fawn techmlogies en rot Yrown, potmtiel impecu .. "usumn the proposed plop will rrwlt in adverse impx[s. Th[ Amencan Soda Sodisw Lmt>x Jues red limit the "adverse impvcr [n Iht mineabiliq v[the ail shtle' m futon mining scerkdas. Oil shale can be minty and retorted today winC wtll- mdemood mining practlu+. Therel'on. it is dear oil sh¢h can be minctl in the future. Futon kchnologies will not chary{e the Da then the proposed xtivn will vJ•m>dy impunh<23 GPT end greener ail shale deposhs. The DEIS sMuld evplun in dcuil, with approprimt. aimapnifc numch, why the pmpomd txtion ds,e,+nm advendy tmpoct the fwuh minability of oil stole. pe5,~ Comment 7 EDers e/ lncnued Operalin{ Pressures on Suhsldepce Nos AJdrrssrJ Thr e+calatcd oper¢tittg pnssura end tempernwrcs u ill cause shale tv Buell end increase the load on underlying formations. This rill shrn six wderl)ing Cormanon.~ Wading m e colleges of dxu formation, followed by a collapse of the overlying formation and surface subsiderne Such pbentmena and+to be included in any subsidence madelinC, with tM modeling tauln made available for public comment before the DEIS is deemeJ conrplelcd. P•5.8 Comment B Subsldmee Msplmrln{ Plaa h Incemple¢ The DEIS Jun trot indirnm if downhole cnetuion meter be mcd to monitor for auhsiJtnce Pag<4-/ of the DEIS stares that Bih1 hen not 7rt rcacheJ a dreuion on American Snde'a request for using Time lbnuin Ae(Jectomnry lTDR). Umil mis decision is Dnalved. the public cannot make infamtM comment nn the propoxJ monimrtn{ pIM. If TDR is thmen, the spplmnnl should provide research or cite publicly available studier Jrmotutmting TT)R is effective in nssessinB subsidence under limiter ronditioru, (Le. c¢vitln ar depths 0nmr than 300 fear.) .4ddiriunel ly. the mnnimring nginx outlinM in section 2.2.51 is not romplele. The DElS snticipstes that."If substden<e eff<ns lie substantially grmler Ihan espeeted, the mininC cnang7 would be edjuved:' Haucver, the public is rot informed o[ H what les'ef ofsubsidevice is expcned,2)the definition of dte>wrJ"aubstmtiel"ire relation to subvdenrr 3J whenhe rimin6 mechanism for deciding iJ the eRat is gnanr then eapuud, d) the public's role, and 51 wM1a[ the putcvlial altematim mining nnmgio would rntaJ or Neir potential mvimnmemnl 4npxt would be. Alu, the first bulls in this sntiun rcfm to "several Poge 3 45