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<br />, f.. <br />Pitch Project Memorandum - September 1:+, 1984 <br />DETAILED COMMENTS ON DAMES AND MOORE REPORT <br />Report Section: 2.0 Summary of Results <br />Subsection: Waterborne Releases From Reclaimed Files (Section ~.~!! <br />Forges: 2-1 to 2-~ <br />The supposedly conservative assumption used which gives rc credit <br />far the overlying stabilising cover and the clay pad resul±s in the <br />study not adequately addressing the likely conditions that :sill occur <br />at the site. The clay cap and pad :gill inhibit infiltration into the <br />pile but if any infiltration. occurs these relatively impermeahle clay <br />barriers will probatrly cause longer retention. times for leachates than <br />was examined in this study. The effects of *_hese relatvely iengar <br />retention times were not addressed in sufficient detail. fln evaluatisn <br />is needed of the conditions t;;^.at prebabiy will occur at the site. <br />Disc~;ssion of the adeq~~.acy of !-he o-inch clay cap and the infiltration <br />that might occur .. the cap ._ partially breached would he a=_-eful <br />additions to this study. <br />Report Faction. 5.-? =l.=,rer'c~•r.^,e „ele=ses Fr^m R=claimed Piles <br />S'_:b5eCL1On: ~.1 Y{a~lOlOylcal sod T..._e Metal Saurc.3 Terms <br />Faces: ~-1 to 5-= <br />:~ Tt:e . _udv cor.ce.^.trates cn two _..r"iltr= tin conditions t?':at <br />r.;ight occur: ai the long-term a.^.n+_,=1i~ed _.:ci-e o+ nornal precipitation <br />and infiltr_=.tion an:~ h) ra^id _..._ltr.~tio-^. =.nd ercolation of .•;ater <br />throL,gh the pile fr_:m .a sirn?- r°cic:;ra.t:ter; _,;ent ^r rapid snowmelt <br />rur.a+f. These Ewa _,._reines are '.ot ne•_es-a.r,l~•r .•:orst-case snnditi4ms <br />-nd inter~;edi~ste-caret _ .eats ..;^.ou.ld ~~ =.naly~ed. <br />~! ~:_nsideri^q ti;e ..!:m er of .a.-._.=.1e=_ that ..- ~t _. .--_~_ t^e <br />___. ~.,1^.g of the .... _ pll°_S the smpir'csl aG ~aCh _,.ed ..i the StL;dy .o <br />- ^b ~hl`i tom? E~.av t~;~a}.^. ^.d of a. _ ._. :_ _- - -?rt-^a.~, ~We re` <br />;:^ .~_ - ;e d°t_i.= cf ne s"G~r:r.et_ _.._. ... ~ ~ _. = 1^'=nfa~, <br />---.r y_~.ra. v _-..r~C'1 .h._.. _,~ _. _-•___- _-= m ~ . „_ _sceo, -:~._.ber eh <br />. _. ~ ._.,r _. _. v.r= sa~;~le r~n i., ~~ =.r _.. _ .r_i - _oil=`_= of --e- <br />Saw '-''.l_ ~f }'.1 };_-L:~.. h~ .. _i _, r~..__ _ _^~L _ -._. t__._-1, -~r~- <br />.P.enta/ __^,'i.2~.rJ.^.' .^.pr _..1,T..~}e r_:ape=-~._ :___~ _O^__t. _.. ~. ..^.B ~La t'.T.e:'1t <br />_.. :Ja^y.~ ~_~ tF";a'`_*;1. .~ .a F`uh..~ _On~°r .'at.':_ _~... ~..Hti_.^: n7 _.~__.?1 <br />=cnr_+.iticn: ca.:^.n:-- ~- =°-ermine~.a, trOiil ti-.-= ....•_r..racinn ~.rp-_..TPC. <br />~_cs?ct_n^. ~.1.1 Laaci-._^a ar .ne v. - ='il_ "t'teri~.': i;nder idcr:?a-_ <br />randitic.^s _ <br />~uthe=,•,'.i;g: =.1._.1 _.a=ping _~ the 'ire --~- J.=r '~he L-.ng ,erm <br />Pages. 7-' _^ J-~ <br />Ti:= ":~.at.r tal.ar,ce meticd" of Thornth;waits and hlati:er (1?~5! used <br />.o =_.._ula~e t!~e a•r~•-a~.= .. =ii.:-.a:lcn .- a reasonable method. It <br />shauld~be noted that :-ghat _~ ac±v._=.li•,' ~-sh-elated is the mcistur:= <br />s ;rpl:_is ;•;hich ;.,ay ,o to eithar inf'_ltreaicn or rur,eff. Toe data ,_:sed <br />in the stL:dy, however, imralid3tes ±^.e _enclusion peached that there <br />is no net infiltra±icn aver the near at the mine site. The data used <br />