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MONITOR WELL DRILLING AND CONSTRUCTION SUPIMARY <br />NUCLA AND NUCLA EAST MINES <br />Monitor Well Name GW-N19(WN00191 Geologic Unit Monitored Dakota Coal Underburden <br />Elevation Ground Level (ft-anisl) 5737.689 <br />Location: N 800'191.109 E 1.119320.42 T 46 N R 15 W S 6 6 A A <br />Total Drill Depth (ft) 125.0 <br />Total Well Depth (ft) 124.5 <br />Drilling Details <br />Borehole Diameter (in) 7 7/8 Riy Speedstar 1500 <br />Bits Tricone Driller Allan Chiles <br />Drilling Fluid Air and Mud <br />Additional Details <br />Grilling/Construction: <br />Lithologic Log (Y/N) Y <br />• Geophysical Log (Y/N) N <br />Cement From 66.0' To 79.0' <br />Bentonite Slurry From 5 0~ To 66.0' <br />Gravel Pack Frum ~ Tu <br />Additional Details BpCa„gyp of raving Haar aurface at a white clay horizon <br />installed 20' of temporary surface casing. <br />Start 07/01/86 Finish 07/03/86 <br />Construction Details <br />Casing Specs: Blank 4"id PVC sch40 <br />Perforated Interval(s) 79.0' - 124.5' <br />Packer and Cement Basket Set At 79.0' <br />Development Sunnnary Air/water and air injecting for 3 hours producing around <br />5 gpm. Cleaned up well. <br /> <br />Coimuents, Problems Bottom of Lower Dakota Coal at 74.5' <br />Perforated 0.05" slot <br />D-15 Revised 11/01/86 <br />