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7. In conlbnnanec with Rulr 6.4.5, please prnvidc engineering details and construction <br />specilicatinns lix the sltectpi{e wall shown in the proposed swimming area on the l'cr•racon <br />reclamation plan maps. FULLY ADDRF.SSGD <br />3. Plcasc provide engineering designs and supporting calculations for the siring of <br />spillways, culverts. anii.'or :uty other hydraulic structure that will be installed in the <br />reclaimed ponii. Plcasc Hole that sn~• permanent In'draulic le:nurc will nccil to hr <br />adcyuatcly sired to withstand the velocity anti volume oC Ilows cspectcd Ihxn a IU(I-year <br />Hood event. 1\\'~ suggest you refer to the attached copy of the. Division's "In-stream <br />Aggregate f-.xUaction & Reclamation Guidance Document' that provides specific design <br />rtitcri:t Inc siring of hydraulic structures). Plcasc prnvidc. Fl ~I I.1' ADDKfSSF.D <br />9, Plcasc quantify the velocity and volume of Ilatas expected on site from a IUU-year IlooJ <br />event, as well as the elevation of the 100-year base flood event and its relation to the <br />elevation of the spillways and lake shore rmh:tnkmrnt. Also, please yuanufy or <br />charactcrire the expected groundwater surFtre between the stream channel and the <br />adjacent Iloodplain to the north under such an ctcnt. I'Irt-u provide. Fl~l.l.l' <br />10. Please quantilj the velocity and volume of flow' esprrted as well as magnitude of Iood <br />event rryuired to produce a "hanklitll" event in the udjacrnt reach ul the St. Frain River. <br />Ako. please yuantilj' or characterirc the cxpa•red eroundwater surlai•c between the stream <br />channel and the aiijucent Iloodplain to the north under such an event. Please prnvidc. <br />Pl!LL1' ADDRIlSSIiD <br />I I. I'leasc clarity the criteria the applicant used to detenninr the number nl'spillways to <br />install in ihr. reclaimed lake. Since the reclaimed lake and slum' wall installation will he <br />adjacent to a reach of the Sl. Vrain River that is over I mile in length, the applicant will <br />need to yu;uuti}' the number ~+f spillways ndcde<t and the spacing interval needed to ensure <br />that Iloodw:uers from a IUit-yrrr Ilnod event will he Jischarcd hark sali•I)' to the main <br />channel of the St. Vrain River within a nasonahic period i+l' tints anet also maintain the <br />stntcWr<tl integrity of the slurry wall installation as well as the surrounding area. Plcasc <br />prnvidc. ADDII'IOn:\I Ii`'FORMAI'I(1?~ RLOLIIKF•.D - SFsL Sli('OND AUI:(11 ;1('1' <br />KI \'ll t4 ITI !rl "~ IN cif\1tl I R0~1 It)ht til'IIRI IVl•IZ <br />12. Kevicw' of the Rcclanwtion Pian Maps provided indicates that the lake edge ranges <br />Intm 1(N)-:3UU leer from the north hank of the St. Vrain IZivrr. l he exact location of Ihr <br />slum wall hrhvcrn the lake edge and north bank of the rn cr is unknown. Plcasc prnvidc a <br />structural :utalysis that verities the minimum width or hufti+r of soil Herded un either ,ids <br />of the shttry wall to provide adeyuatr support during saturated soil conditions. as well as <br />under a rapid drtwdnwn scenario. Please prov idc. Fl ALLY ADDRI?SSFD <br />6.4.7 1•:X111611' G \\'alrr Information <br />13. In eonlbrm:utce with Rulr 3.1.61 11. Plcasc verify whether Ihcre ;ter any ngistrrcd wells <br />within six hundred I6tH)) feet of the proposed slurry wall installation. If yes, please <br />provide a Wrap exhibit which shuw•s the location and describes the otanrrship of each <br />