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• <br />• <br />MONITOR WELL DRILLING AND CONSTRUCTION SUMMARY <br />NUCLA AND NUCLA EAST MINES <br />Monitor Well Name GW-N17(WN0017) Geologic Unit Monitored Dakota Coal <br />Elevation Ground Level (ft-amsl) 5674.12 <br />Location: N 597926.681 E 1,117885.98 T46 N R15 W S 6 B C C_ <br />Total Drill Depth (ft) 105.2 <br />Total Well Depth (ft) 102.5 <br />Drilling Details <br />Borehole Diameter (in) 7 7/8 to 81.0 <br />Bits Tricone Driller <br />Drilling Fluid Air and Mud <br />Additional Details <br />Drilling/Construction <br />Lithologic Log (Y/N) <br />Geophysical Log (Y/N) <br />Construction Details <br />Start <br />N <br />N <br />05/19/86 <br />6 3/4 to 105.2Rig Speedstar 1500 <br />A]1an Chiles <br />Finish 06/24/86 <br />Casing Specs: Blank 4" id PVC sch 40 Perforated 0.02" slot <br />Perforated Interval(s) 82.2 - 102.5 <br />Packer and Cement Basket Set At 82.2' <br />Cement Froin 68.0 To 82.2 <br />Bentonite Slurry From 5.0 To 68'.0 <br />Gravel Pack From Tu <br />Additional Details Top five feet of annulus sealed to ground surface with <br />cement. Bottom 2.7' of hole plugged with cement which slipped past the <br />packer/basket arrangement. <br />Development Surmnary Developed for 2 hours using air/water injection and <br />lastly, only air; well produced approximately 1.0 gpm. <br />Co~mnents, Problems Top of Upper Dakota Coal at 84.2 feet; bottom of Lower Dakota <br />Coal at 107.6 feet (determined from log of well GW-N17P1(WN0117) <br />D-11 <br />Revised 11/01/86 <br />