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New Horizon Adjacent North Grotmd Water Monitoring Holes <br />Fdiir holes <br />1ps are planned. to be drift.ed at each of three sites... One of-th6se' toles_ at each of <br />the sites: will . be drifted as a pilotwffi be W geophysical tools. The <br />hole and logged with g6 <br />other three will be. constructed r <br />holes . cted as* gto* undwaief monitoring g holds. After rey' in <br />:.the. jogs fronthe 6%St holes, the d6pft-for the monitoring hpl.es will be determined. At <br />one niomibtirig hot 'above the coal zone <br />another within the coal zone; aril the tOw' the c6aone.�tq <br />All holes will be drilled using d troch -mounted rotary drill rig. -Th6,p,,ilo*t hot * es will be <br />drilled to a diainet6 r .. of 5-1/8" or'. 5-519" aiid, will be drilled flitough thd'- Nikld Sdain, a. <br />thfit coaly skate seani 1X'ftffid bdt weeft 15 and. 30 f6ei below the Upper ,and Lower <br />are q':t'-e'd f6r mining. ra6h of the three" pilot hot'' <br />Dakota seams the seams -.e§ is to <br />of thes'l t� <br />be logged irpAiedidtely.aft& is: drilled. V ogg'. . e depths and.' - <br />Pon <br />4�_ construction- s C ' tion - d4ail�- for each Ofthe -m6nito `ng' holes will. be decided. <br />spPel., o tfu <br />�c <br />Tho cb-h-struction of thd monitoring holds. is subject to the" findings :of the logs <br />from the pilot holes" but will follow following <br />generat guidelines, e:fttire, 1-)*.*'* Each" <br />hole will ed io. a diameter of a. dte V 6-1 dfiiled,'the hole, will be <br />used with, 4 schedute 40 PVC pp�Qxim...... a <br />* <br />ig, <br />fn the* case of the hole that Will ihoiiitoi Water. <br />abo*e th6 coal zboi;'6. the' iota total depth of the hole Will be several `feet above the Upper <br />Dakota (UDl) ani .'Me.IoWek ten feet of casing will Be ftniill-'slo'tted PVC. -...Above. the <br />sloftedeasing; . a soft <br />f.6ii. ii&ion p�&dr will be placed on the casing -nid 3/8"1 b6ntonite <br />gollets*w11I be ppu6d down : <br />the annulus on top "of the packer to an �16Vajion of tori feet <br />above the packer, bri.11 6iitting§ will then be placed on top, of the.,boitonito pellets to a <br />dOp:lh.6f five fe6t frbm'- the surface. Concrete will. be used to gibut from the surface 6 the <br />top: of the: drill cuttings. <br />'Me holes inofift6ring groundwater within the coal zone will be drilled to the. Bottom of - <br />the Lo:Wer Dako6� �6a�. Sl6tted.casipg will b6use:a 400 the -16t <br />P <br />of the UDI. seam. soft-formaticin packer will be installed above the sl- d gand <br />6.Vq lottp. .�asf4.. <br />10 feet of b�'#'t6iite chips .will fill, the aftfiulug above the Okkei. 'Drill cuttings will b 6 <br />pla6 . ed ift,'the ht)le to a depth of fivid, fd6t from thd surfke'e. Thd fih9 five feet Will be <br />gt.66ted with do'nefetd. <br />. The holes cofnpleted below the coal zone will be drilled to a depth: of aPproXimatel <br />y <br />fift6eji to 30 fe6t b6to"w, the LI)x seam-* glotteid eq§ingAO.I be used fibiri thmtal depth to <br />just below the bottom of the coal A soft-forifiatioii jjA& r '-11.b6 placed seam 6 W1 p just <br />6*16,WV' the bo:do'r of . fhe. . lower sean * I and 3/8" behtonit� . pellets will be, . pour'6d . b . i to a <br />depth of several feet above the UD1 seam. Drill cuttings will be placed in the hold to a <br />depth of Ave feet fToin the surface. The final five feet will be gr:ouf6d with concrete, <br />