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b.J.S 4:~IIIl31'1' 1{ - Itcclamution Plan <br />?. The M1lap Scrics provided as Gshihit F-Keclamutiun Plan Map depicting the Like <br />6nprovcntent Grading Plans :uul all pertinent water'"hydraulic fcutures will need to he <br />provided in suliicicm siic and scale as [o provide all engineering, water, and hydnudic <br />Icuuues in a rcadnhlc fi,mt. Kc+iscd Maps o(24" x ib" or larger may he rcconunendcd. <br />I'Icascprovide. hUI,I.Y' ADDKf{SSF.D <br />d. The tixhibit F-Keclamalion flan Maps show the ";tpproxintatc" location of the proposed <br />slurry wall. The plans, as presented, arc unacceptable ti,r appmvxl. !'he plans will need to <br />be revised to shv+v the definite, enact location of•the slurry wall, nr the applicant +cill neat <br />to commit in writing land specify tin the revised maps) the minimum setback distance Thal <br />the slurry wall will he installed li•om the permit boundary. It is also necessan for Ote <br />applicant to clcarh define in writing (and spccily on the rc+iscd maps) the minimum <br />setback disl:utcr the slurry wall +vill be Irom the lop of north hank of St Vrain ('reek. <br />Please respond. F'L~LI.Y .4DDKEStiLD <br />5. fhe "Supplcmenl:+l Gcotechnicul Engineering Report" prepared by ferr.+con indicates <br />that the ;lorry cut-oll' walls should he "keyed" or "socketed" into the relatively <br />ingtenncahlc cumpetenVinu+et cl:+ystune ur sandstone Itcdrock u, reduce gnnmda:+tcr <br />scepuge. I he repnrt 1i+nhrr states that supplcntcntal coring and packer prrmu+hility testing <br />in the area of i3oring \un4,crs 45. S%, ~l'• J8 indicated that the upper S to Itt li;ct ol'thc <br />sandstone layer was nuxieralcly to severely I~acturcd and that "keying" or "rocketing" into <br />this type of s;uulstunc bedrock could result in excessive seepage losses, and that dccprr <br />key~+:+ys Ibr the slum rut-oft walls will likely he reyuircd in this area. Further, the upper <br />I to ~ Icct of claystone c~hibitcd nuulcratc weathering fracutring and should not he <br />considered cwnpetent intact becmck. In response to these obsrn'alions, the Division <br />rcyucsts that the applicant submit a pl.m or proposal of construction spccilications that <br />provides specilic nreasures to he unplenunted during +:+rying site geolu~,ic conditions to <br />assurr that the slurr}' wall will he adcyuatcly kcyal into competent hcxlrock thnnrghoul the <br />entire pcrintctcr of dte proposed installation, and minunvc thr pulentiul fvr escessivc <br />seepage losses once amstruction of the slurry +~:+ll is completed. Please provide. <br />:1DDIflOV;\I. INI(lKM.411O~ Rfa)l tKLD - tiFF SfC'OVI~ ADIa,)l ~\l'1' Ki-VIF14' <br />I I I.M +~' IN M1Ih\tO FKO41 I O(v1 S('IIKI'I\I-k <br />(,. "fhe "Supplcntcntal Geotcchnical finginecring Keport" prepared by Terracon indirues <br />that the possibility of groundwater tlucu+:nions should be arosidcral when developing <br />design and amstruclion plans Ibr the slum wall installation. and that fluctuations in <br />groundwater levels can best be dctcrnuncd by implementation of a groundwater <br />monitoring plan. Please state aflirrttutivcly whether such a grotmdwatcr monitoring plan <br />will he developed and implemented as pan of the slung Hall inuallation project. if yes. <br />phase provide the details of the grounchvatcr monitoring plan, such as location of <br />ntunitormg stations. Ireyucncy u( monitoring, design ul monitoring stations, length of <br />proposed monitoring, and pu>>xse of gruuniAv:+ter data collected. Please respond. <br />:U)DII I<)\:\I INFUK11:1fIU\ Itl'.QI IKh.D tip.f ~I (ctwD ADt•.C)l'r\( l" K1 4II:w <br />fhfiM1l tr' I\ ~ll•1gO FltUM fC)M1t ti('lIK1iINI lZ <br />