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»y .%' *> •»' .. .-M •, .*>. <br />•V-" <br />'•f <br />Ct <br />*/ <br />a <br />•• I 73-157?arx. Construction''ou indicated thai tr.e tottc-T. of tne existing lar.df:.* r.\teria. <br />I^at Alas .elevation 96c-. T.no exi.tir.-^ surface clevatic^^^ <br />-ha undisturbed wetland ar-a is at aoouc c.eva.ic.. )T-_ .ce-. <br />Cbis 4-foot difference in elevation probaoly <br />naterial is aoout 14 feet thicx. <br />tfie a.'sovjnt oi uettleaiont tbat. '■.aa resulted <br />landfill <br />h.it there haveJudijin*; frcn» th.e length of tire t.nat^ t.he exiat-ng <br />natorial has been in olace« and your ir.uicat.cn <br />bo-n no -revious staoility ?rcbloc.3, it is our cpinicn t..at tr.c <br />f proposed *odd it ion of 5 feet of nii.neral soil above <br />Z existing landfill grades presents a very s.icht ris. o. <br />^tailure. Our experience wit.h projects wnere ad-i-.una. .*...^.0 <br />placed above existi.ng landfill r.aterial.>« h*^.^®*"** ll'^f <br />resulted in additional sett.eT.ent. but <br />cc.nposition of the existing .anof;.. <br />possesses a rather hiqh .\nq^o a^a.c^ion Ar.c a <br />hi’ym.or .tror-r--'. TW ,«-.lc=.e.-.c tra-. ha, «curr^l <br />over the past 30 years .-.ais also increased the x.hear s.rvngt.h o. <br />the upoor zona o: organic soils whic.h lessens the rise or shear <br />or punching failure as a result of placi.ng an ^;)Cuition. . <br />aurcharaie load. rnus, baaed on this ir.tc.*-r..u:on, it Ou. cpi <br />^Jon ^^at tnu audition of 5 feet of fill over t.he area presents a <br />very blight risx of crr.bar.<rent fa? lure. <br />It Should be noted that soil borings vit.n power ^uipctent ^ve <br />. .hot boe.h taicon in t.he existing l.indfi.l .area to <br />position and strength of tne existing lanui..* cateria., and <br />strengths and depths of the underlying organic sows. .. t^ <br />assumptions we have made are Inaccur.ste, our evalua .ion o. t.he <br />potential risk nay need ’’o b«i re-evaluated. Additional bor.ngs <br />and tests at this tire do rot appearplanned. However, at a nnirur, we recrrirond t.ha. p.ior o <br />placing any fill, s-veral settlener.t .-cnitoring pl.i- aAny <br />inn^.^U^d in vAnoun jr»tr»v Arcjr.d <br />th3 <br />: 4'^t <br />^xiAwin^^ 1/inUeill ijr.a <br />placed in two of 2 1/2 <br />pon i tor i. r.<j pint'.i s.'^ojld br* <br />TAtii of settlor.fnt cau.-.exl by <br />t r*.#' add ; t; on.% a <br />or r.r.'.;o. <br />•ill <br />•Aid «“ hi» <br />t no n i!a I r. c! ^ w f i - a . <br />ovaI\: i r.^ <br />?o *i •» * * * y <br />A OZ an^to rourie/xr. nhculd be set snide between staged <br />fill Applicationn to a IIcw nor*'for ron I tor ir.‘5 pl^t«*5. <br />If t.he additional riner.al fili ex*.eeda 'ver are,a tnat .ire pre­ <br />sently virgin wetland, the r:*< ri ‘ *^7f,--.^iaue wi ’ Icantly higher and a much ir e cent rr. I-d ..*lmg - c... t, <br />appropriate. <br />■ i^sr^ ‘s-»^ ,^2~1 <br />t; <br />r;> vv ■. •'A"'* <br />* . - N ' ? <br />.ev^v . . <br />‘.>.‘wVhhV.- • <br />w /di .-V <br />S”C'^V- :■ <br />feSJW':