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8. Plcasc pmvidc engineering desiSms and suplx~rting calculations for the sizing ol- <br />spillways, culverts, and.'or any other hydraulic structure that +vill be installed in the <br />reclaimal pond. Please note that any pcnnanont hydraulic lealurc will need to be <br />adcyuatcly sized to withstand the velocity and volume of iimvs expectal from a lOtl-year <br />flood event. (Wc suggest you refer to the attached copy of the Division's "In-stream <br />Aggregate Extraction R Rc~cl:unation Guidance Document" that provides spccilic design <br />criteria for siting of hydraulic stnrctures-. Please provide. FULLY' .1DDKFSSED <br />9. Please quantify the velocity and volume of tlows expected on site from a I(1(I-year Hood <br />event, as well as the elevation of the 100-year base flood e+•ent and its relation to the <br />elevation of the spill+vays and lake shore embankment. :Vso, please quantify or <br />characterize the cxpcctcd groundwater surlacc bet+vecn the strc:un channel arni the <br />adjacent floodplain to the north under such an event. Plcasc pmvidc. EIILLY' <br />ADDRESSED <br />10. Plcasc quantify the velocity and volume of Ilow cxpcctcd as well as magnitude of flood <br />event required to prcxluce a "bankfull" event in the adjacent reach of the St. Vrain River. <br />.Also, plrtsc qu:uuifv or characterize the cxpcctcd ground+eater surface hctwcen the stream <br />channel and the adjacent floodplain to the north under such an event. Plcasc pmvidc. <br />PUL1.5' ADDRESSED <br />I I. Please clarify the criteria the applicant used to determine the number of spilhvays to <br />install in the reclaimed lake. Since the reclaimed lake and slurry wall installation will he <br />adjacent to a reach of the SI. Vrain River that is over I mile in length, the applicant will <br />neeil to quannfy the number of spillways Headed and the spacing nucnal needed to ensure <br />that Floodwaters from a I(N1-year flood event will he discharged back safely to the main <br />channel of the St. 4'rain River within a rcasonahlc period of time and also maintain the <br />structural integrity of the slurry wall installation as +vcll as the surrounding area. Please <br />provide. ADDI'I'10\AI. I\EORM:\I'IUN R!?(1lJIRIiD - SLs[i SE('O~iD ADI=.QUA<'1' <br />REVIEW IffiM rl4l\ ~il:MO FROM19'I'OM S('lIKE1NE.R <br />12. Review of the Reclamation Plan Maps provided indicates that the take edge ranges <br />from IIN)-300 feet from the north bank of the St. 4'rain River. the exact location of the <br />slurry wall hchvicen the lake edge and north bank of the river rs unkno+vn. Please provide a <br />structural analysis that verities the minimum +vidth or butler of soil needed on either side <br />of the slurry wall ro provide adequate support during saturated sort conditions, :>,r well as <br />under n rapid drt+cdu++n scenario. Plcasc provide. FULLY' ADDRESSED <br />6.4.7 t:X11161T G - Water Information <br />13. In amlbmtancc +viQt Rule 3.1.G(11, please verify +ehether there arc any registered +arlls <br />within six hundred (6001 feet of the proposed slurry call installation. If yes, plc:isc <br />provide a map exhibit which sho+vs the location and dcscrihcs the ownership of each <br />registered +ccll. (1\'ells registered with the Ollice of the State L'nginecr). Ple:tsc respond. <br />fl'+I,I.Y ADDRESSED <br />