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~~ti.:~ ~~ <br />• <br />tri-.r~`~~'~L~-,'~~ Lti.:/r~~~l ~ YA ~~~~.GV e~ C~.~S~ d~'vs ~iti."..~ tl ~`'J <br />x1210 L",1ST liih AV :NUE•DENVER,COL(?RADO 80220•Pl-TONE ?,2U-:i333 <br />Dcccmhcr 1", 1°79 <br />'Cimothy C. Smith <br />Supervising Ervircnme tal Engineer <br />Cotter Curporation <br />t'305 6'~at ALm;cda Yar .,ay <br />l.~kcwoud, Colorado 8'226 <br />Dear ?.r. Snith: <br />This letter i;; iit re rJ to [Ite ::ovember 29, 1979 site visit of [he <br />Schw,;rtzwalder ure so tux by Mike Brokzt of this Department. *tr. Brown <br />was acr ompanicd by Ed 'rlcGrath, Attorney for !:otter Corporation and <br />• Tir S^~i.th, Cori..~rat~~ nv.ironmcntal F•,nginr.cr. This Ddpartiacn[ a<,uld l i~,: <br />to c+.pre.:s itu :;pprcc u[ion to `Ir. McGrath and :;r. Smith. <br />Several i;;~nc:: ~uv~.1v ng the operation of the ure sorter warrant attention. <br />This fr•partmui~t ccrio sly questions the ~:ensitivity of the currznt prc- <br />sortine system to dut~ ct small amounts ot_high_gr;i~e._o.re lntermi_xa_d_with <br />.,ate rock. This con ern arises whe.cLOne_coGSld,;rs__Clh.e_BC:enu_tion of <br />r:ri ~,^~~~_hoto:~s by scrr~ ending waste rock and railcars. Therefure, iE is <br />po::ibla thue ure c:m be deposited as waste rock. Even at_a _cut_uf_f rr.~dc <br />r,f O.OI~i:? Uq(1~`thc~S.e_tn~~. ~nsontain up to G2~Ci/g of z-6Rn (Environ- <br />mental Frot~ction Age'Cy Comment 32-1-12.). Largo deposits of wa:;te rock <br />were observed during he last site visit. The importance of these ].arse <br />gn:,ntirirs n~ w.a•,te r~ck and possibly ore deposited as wn~tc rack I: <br />n~,tlized whin oi,~ cuu idurs the possible contamination of Ralston Cree!:. <br />Rain, espcci;~ily ii i is acidic, may Uc capable of ]caching soma "f~a <br />from the wa:;tc ru.:i: u ora. Radium, once leached, may remain in soluti~:n <br />and as such, may ba c.rried into Ralston Creek as runoff. Specifically, <br />[he followin,; icsucs Rust receive an in-depth analysis for your li.censc <br />ap;•lication: <br />1) the total a~ouat ~ E waste rock deposited in the valley, <br />2) ,'ehe mmtunt of trte _~ rock deposited pc•r year. <br />• <br />