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MONITOR WELL DRILLING AND CONSTRUCTION SUFIMARY <br />NUCLA AND NUCLA EAST MINES <br />• Monitor Well Name GW-N21(WN0021) Geologic Unit Monitored Dakota Coal Overburden <br />Elevation Ground Level (ft-amsl) 5740.94 <br />Location: N 600392.383 E 1,119289.39 T 46 N R 15 W S 6 B A A <br />Total Drill Depth (ft) 56.0 <br />Total Well Deptli (ft) 56.0 <br />Drilling Details <br />Borehole Diameter (in) 6 3/4" Rig Soeedstar 1500 <br />Bits Trirone Driller Allan Chiles <br />Drilling Fluid Air and Mud <br />Additional Details <br />Drilling/Construction: Start 07/09/86 <br />Lithologic Log (Y/N)~_ <br />Geophysical Log (Y/N) p <br />• Construction Details <br />Finish 07/09/86 <br />Casing Specs: Blank 4"id PVC sch40 Perforated 0.05" slot <br />Perforated Interval(s) 26.0' - 56.0' <br />Packer and Cement Basket Set At NA <br />Cement From 0.0 To 5.0' <br />Bentonite Slurry From_ <br />Gravel Pack Frum 5.0' <br />Additional Details <br />NA <br />To <br />Tu 56.0' <br />Development Sunmiary Air/water and air injection for an hour; produced about 10 gom. <br />• <br />Coimnents, Problems <br />15-2-11 Revised 11/01/86 <br />