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; <br />~ <br /> ;, <br />*, <br /> <br /> <br /> <br /> ~~ <br />• -~~- <br />III IIIIIIIIIIIII III <br />999 <br />c121t) E.1.~i1 lith AV :~UE•DENtlFR~, !ADO 80220•PtiON[ 3211-0333 <br />v <br />Ceccnhcr I.?, 179 <br />Timothy C. S;ith <br />Supervising Envircnme tal Engineer <br />Cotter Curpuration <br />E'30j tciat Alameda 1)af uay <br />1.3kuwoud, Colorado 8' 226 <br />near :1r. S~nitl): <br />This letter is iu re, <br />Scliwurtzwalder ore so <br />w.3s accompanied by Ed <br />• Tin ti~:iCh, Cur;,,:ratr <br />to r•:pru:~s its ::pcn'oc <br />rd to tl)e November 29, 1979 site visit of the <br />ter by *like Brown of this Department. 'Ir. [irowm <br />^1cGrath, Attorney for !'otter Corporation and <br />nvironmental F.n~inucr. Tlcis Dupart~acnt would lik.~ <br />ution to >1r. ;1cGraCh and t;r. S:~ith. <br />S+vcr,31 i:;auc:: ~nv~•iv ng [lie opcratlun of [hc arc sorter warrant attention. <br />Thin r:~~part^;u~+t scrio sly questions the :sensitivity of the currznt: pre- <br />sorting systum to dct•ct sriall amounts oC_higl}..gra~e__ore lntcrmixcd with <br />...ore rock. Phis coo ecn arises When_o.AC_cors.d~:rs_,•t.,`Le_at.:.enuation of <br />i::;:~;^a ,I)otr.;)c by surr~~unding waste rock and railc~~rs. Ticerefure, it is <br />poi ihla that ore con be deposited as waste rock. Cven at a_cut_uf_C grade <br />uC 0.015% Uq(!^L the W. SYLSOrk ~:,~ contain up [o G2 PCi/g of ~=6Ra (f:nviron- <br />mcnwl Frot.:ction Age cy comment 32-1-12.). Largo deposits of waste rack <br />acre ebs::rved during he last site visit. The importance of these large <br />qn mtirirs of w.3ste r•ck end possibly ore deposited ^s wa~to rnck 1: <br />r+•aliud wi)u;; ouc cou idurs the possible conta~^ination of Ralston Crce!;. <br />Coin, cspcri;'oily if i is .acidic, may be carablc of ]oachint; soma 22f'Ra <br />fr++m the c:~a;;Cu ru.:i: u ore. Radium, once leached, may remain in soluti+cn <br />and as such, may b~ c,rried into Ralston Creek as runoff. Specific:ally, <br />[he followi,;;; issue: Rust receive an in-depth analysis for your li~:ensc <br />np",11Cat1On: <br />• - 17 the total mount f waste rock deposited in the valley. <br />2) .'the nur)unt' of t:r)c :• rock depo~lted por year. <br />• <br />