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<br />la,t,y Oahler
<br />I~ovendx:r 3Q, 1993
<br />~t.llhv/~ Sc"u.r
<br />JUN ~' 95 15 ~ 14 No .005 P . 06
<br />'rl,e uivision 1u.rthc:r requires the instal]at:.ion c,i lU :aan[lpil:u•
<br />Iii r_~wneiC L:::J .5 t, i_ tha crest of the raise scr r. r.ne.:d at the 1.~RC~.v ul
<br />tLu r:~,i::e ti]1 ~,nd `, at the upstream toe af. the: raise whi::}, mil]
<br />Lu ::u,tuunclu(] l,y tai.]ings as t}re tailings deposition cont.inu::r;. wee
<br />.u~r:: cot,cerned i,]JOl1 t. 1. }te quality and interpretation o] d:,t:, wl,~ cL
<br />wi 11 1,r. <,hi.,,inr.d l.twu the five tai ] ]nqs pi ezometc7: s. <Il,vi uus~ I y, .s::
<br />i .Li.lit7ys aru do+posited a7.~ound t11C screcened int.erva] r.:clluti[~u `~,i ] ]
<br />I~~• ci,]]crteel in lieu piczometer. This water will hiivi: tr. I,i•
<br />i:varuatc:d periodically from the piezometers to provide any (:ot t- ,~I
<br />dut.,. Also, tha piezometers are likely to heconu• vi. Icree.t.
<br />h,rrt.i (, .I ] y 1 i -l ].c<d with sand and slimes. During tlepor:i ti nna I
<br />s:~~yu[:~nc.i 7u3 of :;l,i yot.s along the upstream face of t.ts~ ;:7a.i r:
<br />i:I11bFU 11C111CI]L"", a 11 U1I1j,Cr, if not a] ]., Of t]leSQ pl @'L UI11P. t. r: Y`; `:: i i Iri
<br />i n;,cccasible f.or mFasuremeni.s.
<br />once thu scrr:cn section is completely buried 1-,y tai].jr;_I:.;,
<br />r,ic•zometel-s wi 11 ] i kely collect small amount:; of :,titer :~:: r. }, :•:
<br />:ni jr',cunt. Ltii ] i nqs conso] idat'.e. As there wi ] ] 1', r: no l:;ll~ t [:
<br />c},,t.Frmi.nc what tailings layer the water i~ comi.nq i rom r~r I,L~,1
<br />t~,i.]ing:: thickuu:>:~ is involved, we do not bcaieve that: r.lu~ce
<br />l,iezom~t.er.s W11]. pT6V1de IIICaI1lIlgfUl data fOr COll:itlll('t.i!!!! "~ T.l~t'
<br />a(•cw,d dam r,~.ir:a. Furthermore, the piezometc:r~: wuul(i L"odi[;a
<br />~,l>::i,] ut.eay no data on the density, and t:herefot'e undrai ncc} e,hear
<br />:a.rcnyt.h O]- S1 eAdy-51'.al. P. strength, of the water he,,r.i u[) ).,y i:t ::
<br />wl,ii:h i:an bc: .incorpuratr,d into an analyses of stttbi.l.ii.~` r * t L~:
<br />::ccoud raise:. '1'L(: Faire 2 lift foundation invrst.i qat. i o„ :,nci
<br />tc_tiny wi].]. define the .aturat.ian conditions nnx':h rnorl: nr;:urr;;[•ly
<br />than the tailir,ys piLZO111atCrS. HMRI is unclear of th,> ~.nt.,!ut. (+i
<br />Ll,e t.~i:7i,u3e: l,ier.umct(:r.':; when other more accur:,t.c tcchnologi~as,
<br />::uch ur. piezocone p[:net.rometcr testing as Conduct,-c] in ce^;,~:,~t i^::
<br />with the Pha,r:c 7, Re.ise ycotechnical investigation:., r`xist.
<br />'.I'hl: 17.ivi.sion 1,:zs reyuired the fo]..lowiny conditions in con-iunct..il~l,
<br />wit.lr t.l,e apl',r.oval. v! the embankment raise ii.ll :ape•rii;r:nl,i~n,
<br />CIta7, LlE, '1'R--16:
<br />]) Mc,nth] y mono Lori ng of all embankment standpi pe 1,i r:zi,:~li~t.e7 s
<br />-~ c.lata to ].,e it,cluded in the annual report.
<br />A commitment to report to the Division wi 7-hi n ,.,uc ,,,: ok i i
<br />wai'.cr. ].:.; [ict.ccted in any of the embankment :'.tandpil;c
<br />1, i e zomei.e r.::.
<br />'1) A conuui t.lnenl. ko ntot1t111y monitoring of tha 111n•, 7 :.li'.r t. c. t l,~
<br />collection pond - data to be inc)udcd in the arnu7.~] r ~.,I,<„ r..
<br />lt141t1 agree., to L17e specified .conditions for_a.pprova.] of 7'h-1G lIL?C,n
<br />the r.lar~ i~a.ion c,f the purpose of ta9.l.ings piezonic`tcrs.
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