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<br />Pitch Project Memorandum - September 1', 1984 S <br />the pile may- significantly increase the concentrations of dissolved <br />elements in the leachate. The e•:perimental data supports this. If the <br />L.eachate had a retention time of ten days the concentration would be <br />e::pected to be similar to those given in Table 5-~ (the corrected ver- <br />sion). <br />Forge 5-6 - Cvrcentrativn of Constituents at Pase ^f F•ile Leached From <br />Pile Material <br />1) C?ne of .the assumpticrs fen percolation of :eater through the <br />rile is that there is nc lateral di=_persicn of the wetting front and <br />therefore ..^.a dilutic^. of tF:e leachate •r+ill oo~ur from this source. <br />This ass+_;mption is said to add conservatism. There is no e;;planaticn <br />~;;hy lateral dispersion of the s•+ater through the pile a+ould cause any <br />mil-!tics. T`.s _?ater that traver=_.es the pile laterally has as great an <br />oppert~:nit', to leach cerstituents from the rile as that traveling <br />.=rtic-.ll•; .~• erh-sps _,._.. Bret.er _eachir.g ability because its *_-=:nsit <br />_.-.._ tC tr,~ t)-~~=.~ Ct ~. .- pile 15 ^yr-?3t°r. <br />_. ..._ _.~=_.:-ptian=that the retardation cceffi=ion*_ of all *_!-~ -=1~- <br />:..ents ._ _,.,_` ~ •dces not ne~_:=ss.arily introduce a rent deal of _~-.=_-er- <br />._ _____,-: _ to _,._ ~t;.!dv. ?._ .-sr'e:-s;;ce cis.=,i that gig.=s .an °:ar~~.r=_l.r high: <br />=tardat~o.^. ._-~efficie.^.t .,.. ..-di_,.m .~ a st~_:=': cf radionuclides only. <br />i~%o infvriaati„n __ iv_ =or ~~.e _rarda.tivr. rc~fficie:^as of other ele- <br />...._nts :-+hich ^.a •; be°:a~ge , _-y differ=ntl~1. Also. the sorption .ability of <br />-he ,Tort--i.le in _. _ ~:ile J_~anoes ~•rer rime =._ the _,vailabla e-erpticn <br />__~ n 3r_ .___-_. _.. =:~d1t1Cn~ ., f~LtdS ~:a.c ~~^. "ye. ~tentiCn Limo in <br />t~. ~,a =are=.ti_:. _~_.,---ent h.~.s .~-- -~:pcr+=.. _e. <br />_. :: = t:•,o a-=+!:rptions _.scuss=d .~.bvre -..~~ .ld net be nec_ssary <br />--:_~,;,.= t^:e cr.-nr~^trativr,s are supposedly deter!^:ined by *_he tests <br />~rf=.-.. _~ _.-_-:.y t^is empirical .,.ethod. if there is ffi=__,,^.t _est <br />__:{-. }:,:-=r -i~ou.ld be ro .sod to m.=.i::e th=_.e aSSLtmptl-^. 3. <br />:._ .. _ ~, ..^.lp _r.+o=n c_ncenr-at-~:n ~= _ „_.._ n t.-e feat;-at.s <br />_-., ~_he ._ -: `: _..._. ,sta ~~n t:^._ rttmber ~- -_ _.:_ ..~ _. _ _ .r _. _.r-'t <br />_- _.._ _..._ =~CC.I:j __ gl. en SC _,^.3. _'4~.ir, -~f _.___..__ _- a'. 311a~.v <br />_ u-~ to v- - vonc~ntration of ~ar.stituents .. ~ i-rainage <br />_„~.. .::_.s rOm ~ICW F-1rrC=. _. _~.`-f ,.ce <br />l: i ^.- -.^:aly=_is o= thz pess-ble ~_ncenfr~=,t_cn=_. ... =_,_:rfacs dr=,in- <br />- -_ of _.er:enrs .~_ched from the stoc'.-:piles ...B..T.lne3 the si,^^.gls ca.s= <br />...._.. all 'he :•+ater that leaches through the sto._t.:pil~ after a large <br />_. ^fall e•:e~f is avail.=.ble a=_. surr`ace r ~=noff _ _. a s..ort t'_:ae period, <br />'his ca=_~-= .- ne of the sit~_:atiens that co!ald es~,1t in high concen- <br />._ra.tions in the ~_.. .~._~ drair..aves, b•_:t .~ net _hs ^ra~ one. This case <br />ass;.:mes that tYae leachate that is a•,:_=.il_=.ble is provided 'cy the precip- <br />__aticn s._n}. If ..ester is retained in the stvc~::piles by the relatively <br />_mpermeabie clay barriers it is possible that a large precipitation <br />event may flush eu*_ 1•~achate that has a long retention time and :such <br />higher cencentrativns of elements than indicated by this study. <br />2) It would be useful for this study to investigate other events <br />