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:k 'nm <br />"^- 7i\j' • <br />!i;n <br />I: <br />Kt.. <br />r <br />I-r. V » <br />'-V'. <br />-=^- <br />H*. <br />ir^K' <br />'li <br />73-157 <br />ParX Construction <br />You indicated chat tno bottc» or tne existing .jr.dfi.- riiteria. <br />abwat -elevation 96o-. T^e existing surface clev.itioniii St ------the undisturbed wetland ar^a is <br />oi <br />acout olevaticn leet <br />£K^uSU;L^?S^”itr;•?.;r3?;a^ <br />BMtsrisl is snout 14 feet thicx. <br />^^riaz;Judging from the length of tir>e tr.nt tr.o exi Jtir.g ^ ^ <br />Zexiatlng lanofill grades presents a very s.icht ris* o. shw^r <br />nrobsoly possesses a rather nigh .n..efnal angle o» fr.w-ion arc <br />rSher high shear strength. The settlerient t.nat has <br />over the past 50 years naa also increased the ahear ^.rengt.h o. <br />the upoer zone of organic soils which .essens tne r*s^ o..^-..L^r <br />or pinchir.s failure as a result oi p.acing an acu.-iv.a. <br />auicharge lo..d. _Tnus. tauec or. tni- ^a <br />nion that tne addition of 5 :oet o: f*.l over the area presents <br />vary ylLghZ ri5X oi e.v.oancner.c lA'eurc. <br />Iz siiculcl bo noted that r*ci bor;nqr. vit.-. pew^r c<;u;?n:.?nt *^uv^ <br />strengths and deptne ci t.he underlying organic io^^s. t..e <br />assuisptions w* have made are inaccurate, our evaluation <br />potential risk may need *‘o b»i re-evaluat-»ci. Additional bofytgs <br />and tests at this time do rot xrpenr '*5/planned. ilo-wevar. at a mim.-rum, we r.'crTccnd w.na. j <br />placing any fill, several settlor^nt rcnitorinc pi.i. 3 <br />installed in varioun are.is, prefer A.ily around the ^a.-’s^c. _ <br />existing landfill limits, anc th.^t tn.« acd;t;.«r.,. ...4 <br />placed in two Ktages of 2 1/2 :-et per r.r nge. ^et-een • i •-*j <br />monitoring plates should be re:*.»re-. red to n;d •",^•*‘’*‘‘^90-.' • . •• <br />rat# of •#ttl#n#nt cauj;#ci by t.^.c AiioiUawr. oz ..a.eea ? <br />a period of one to four weexs should ce set sr.ide between stag-d <br />fill applications to allow nor- t;re for renitoring the plates. <br />2t the additional mineral fill extends -ver <br />9#fitly virgin vs^tlands the ci <br />cantly higher iind a much m ccn«: ro; l-^e <br />b# appropriAt#. <br />tn^t. <br />fniluro IS <br />ar^ pr#f- <br />•;i':;ni 5 i- <br />/ 4 ' '^ # s mg tecnmque 1 • <br />Vt <br />r1v*"Y;r: <br />r <br />iS&% <br />- <br />&4p:: <br />4, ,-.i <br />;-*i i';' <br />* k-^ j <br />O'-