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z ~• <br />Pitch Project Memorandum - September 13, 1984 <br />that could cause large amounts of runoff but are of longer duration <br />than the single rainfall event. E::tended periods of rain and rapid <br />snowmelt are cases that should be included for comparison with the <br />single large rainfall event. <br />:~) The assumptions used in calculating the dilution that may <br />occur in the surface drainages are difficult to assess as to their <br />validity. Many of them are dependent ^n the relative timing of dis- <br />charge of the leachate into the drainages and the runoff from other <br />sources that would cause dilution. A more useful analysis might 6e to <br />examine the dilution caused by a range of volumes of runoff that could <br />be expected. <br />F'age 5-? - Fotential Migration of Leachate Into the Soil <br />b <br />;) The study ass±;mes that the worst case for infiltration into <br />.he coil i3 _~,_ samz as the worst case fr high ccnczntratinr.s of <br />lea,_hae in surface drainages and uses the same ..et of assL~:^ptic^s <br />even though they are net particular?•; r`i;-:~n` cr •raiid. Situati,--^s <br />th-=t ___.it in hi~3h ir•.filtraticr: into the~soil arz not necessarily <br />ones .Jh1ch g:_~^erate hlgh ru;-=ff. <br />_. T` e =_tL:.-.; ~^.l r = ..si.!er perrcl3ticn o F leachate .,^.to the scii <br />under t,e ciay pad ~.nd states that it _~ ::nli}:ely in _. short-term flew <br />sitL.~:ion that =here :•sill be slgr.ifl{ant .,.illtratlcn. Thls .~ an <br />ac__.~ c__ as-~ss;^e.^.t _,~ ._.. as it gees. It tct_-.ll•~, igr.cres the fact <br />}hat le 3c^~.~te wt;ic!'~ has ~°r~ci.~ted thr~-ugh t~:e pile and cannot continue <br />dewno-;ard thrn±~.gh _..e ,_iay pad sviL seep cut _ateraliy if ti:e _tatlc <br />he:.d _~ sLt=ficient. A^, ,.=3ci-ate _..et s?eas c_;t b=vend the =dc° _f t!'te <br />~1_=.,; 'd --,,. t:^:en =nfiltr=.te ir.tort!;e v-i1 at ti,z =age cs t:,e pad. <br />_ ~.:._. <br />'~ If the probable conditions at the s.taci::piles are considered <br />ra _::er =~ pan the ~.-1::ely =_.itL.=.tion _._~ _.~:ae,, for t^e ;ors± case for <br />__rfacs rL•rcf~ ~_ontaminaticr., a r.:er.e ~-ericus pct~ential e.:ists for <br />~.'_.~r-_._ ~n _: .___: =te cut cr' t^~ stc~-, -- _. _ _..`° Tne =-., , _~.n.ing <br />scil=an~~ pos=_-ibl; .^t1 tha yr~undwat-r =,a_-.... _~ !a_._. .__ c±Liid=_ L.p <br />... ^F,3 a_ ` _- ., 11 rh.~ =.t _'t1C :,_od 15 <CS°f ~ tC =d.:_ -...2n.3g? <br />~.ra_:r;d =!-•_ _ _ .~, _.,_ ~~r.ce^t. ti~..~ _ .e _ ~ . ay ~_ .,_;itn -igh <br />~L._ _.J ._. ___.. _.On^_i.T.ea _.nd ±:'.~ _=C~"""'ye :.__ __ .te °_l_w _,iloa;- <br />im.~ ccF: f~rtu^.ity -~r =•-co__, __cn int,c t^e -,-i1. ._ s!-nuid~ _~ deter;rined <br />:-Jh.?.' ~ _.:_ =rf_ct=.. ~~f yth~s ype of daschar~P woL:.id ~~. Tr•°re .° p~_t~entzal <br />,_, :YU11C'LtY^ of ei:=menus lz.a+_hed from the plies .n _„_ ~_.rrcL:nd'nq =.olls <br />whe-° they: ~__;ld ~e t.a}::gin up b•>~ the .~yetatiO.^. .a.nd ps°se,~ •-.n upti-.e <br />foes` chair.. <br />F'epcrt Seai~.r: ~.= L'ptak:e of ~'adivacti'.av b. `:=_~tati._ -o•.er <br />°.~gP b-1 <br />This ~2cticn cr.ly addresses the pc~sible L;pt?,'r::2 of radioactive <br />elements 6y the •regztatic,n directly cv_r the stoc}pilss. It _res <br />the possiblity of uptar::e by vagetaticn in. areas adjacent toyt:^e stock- <br />piles and also ignores other el=ments which may be as harmful or more <br />harmful than the radioacti•.~e elements. It should be noted that the <br />leachate concentration listed in Table 5-~ for mol,bdenum is quite <br />