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recistered wail. i\1'clls rceistrred +iitlt the ill!ire of the Sour [(u~~inerrt. Ple;rnr risp~mcl, <br />FI ~I.i.l' r\I)URESSIiI ) <br />IJ. [n cuntbnn:mce with Rule b.d.?(I), please. state atftrmauvely +vhether the proposed <br />slurry mall installation is expr:cted to directly affect surface or groundw atcr systems within <br />the affected land and surrounding area. FULLY ADDR1iSSfJD <br />I5. In cunforntanec with Rulc 6,4.7(?)(hl, please provide a characterization of the alluvial <br />ayuil'cr in the afti,cteJ land and surrounding area which includes the fi>Ilowing: <br />• Hydraulic gradient, and direction ol'growtd+vater movement <br />• Description ul' the St. Vrain Creek for the reach adjacent to the slurry wall <br />installation (gaining or losing stream, channel stabilih, bank stability, presence of <br />riparian ce~;ctationl <br />• Dcscriptirnt of the norntal surface+groundwater interaction and function throughout <br />a 1_'-month cycle in the altceted land and surrounding area (including JI. Vrain Riverl <br />F(1LL1' ADDRL•SSI;D <br />I(i. In contiirntance with Rulc 6.~3.?(211b), please provide a reprracnlative Bross sectional <br />diagram for each of the three (31 mined lakes which adcyuatciy depicts the leatw'cs ul the <br />alluvial ayuifcr +cithin the alYected land and sun'ounding area. l'hc cross sertiunal diagram <br />should be drawn to sc;tlc and provide the fitllowing infomsuion: <br />• f-:xisting reclaimed cacavatiun(sl and lake high water mark(s) <br />• (iroundwatcr tpcvontcu'x•1 surface <br />• Proposed slurrv wall installation <br />• St. Vrain tilrcam ('hatutel I li'nm tap of Kurth Bank to top ol'tiouth Bank) <br />• It)U-\'ru Floodplain boundaries (cxistint ~ proposed) X• elevations <br />• Si. Vrain ('reek - I loud+vav boundaries <br />• Any existine re~istcrcd wrlls +vithtn riUU (ect of tltc slurrv wall installation <br />• Ordinary high water mark ufthe St. Vrain Ri+'er <br />• Invert of the St. Vrain River <br />• Signilieant +actiands, and or woody riparian vegetation <br />Pl'I.I.1 :\DDRf~SSGU <br />17. In confbrntnnce with Rule ;. L6(I ), please yuanlify the vertical anJ horizontal extent of <br />impact to the groundwater surlacr and normal gruundwatcr rcehargr ur flow p;utem(s) <br />upon completion of the slurrv wall installation. It is lire Division's cxperieatre with other <br />slurry wall installations that there is typically a "mounding" and "shadowing" ctlcet. <br />fhesr imp:tcls arc 177tically quantilicd through groundwater modeling anil Held vcrilied <br />through a groundwater moniroring pro~;r:un. .41so, please descrihr and show un a map the <br />lucatiim of any water (eanire (well, spring, wetland, ripari<ut vc~~elationl or pcnnancnt <br />man-made structure (leach Held, sewer line. highway bridge support, septic tank, Biel that <br />is +yithin the scope Iradiusl vl influence of Dither mounding or shadowing. and assess the <br />impact to ouch feature or structure. finally, please describe [he mitigation measures that <br />will be entpioved to minimize Ate unpact on the various water Ccatures or man-made <br />structures. FULLY ADDRESSED <br />