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MONITOR WELL DRILLING AND CONSTRUCTION SUMMARY <br /> NUCLA AND NUCLA EAST MINES <br /> Monitor Well Name GW-N19(WN0019) Geologic Unit Monitored Dakota Coal Underburden <br /> Elevation Ground Level (ft-aRisl ) 5737.689 <br /> Location: N g00391, 109 E 1,119320.42 T 46 N R 15 W S 6 B 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 Rig Speedstar 1500 <br /> Bits Tricone Driller Allan Chiles <br /> Drilling Fluid Air and Mud <br /> Additional Details <br /> Drilling/Construction: Start 07/01/86 Finish 07/03/86 <br /> Lithologic Log (Y/N) Y <br /> Geophysical Log (Y/N) N <br /> Construction Details <br /> Casing Specs : Blank 4"id PVC sch40 Perforated 0.05" slot <br /> Perforated Interval (s) 79.0' - 124.5' <br /> Packer and Cement Basket Set At 79.0' <br /> Cement From 66.0' To 79.0' <br /> Bentonite Slurry From 5.n' To 66.01 <br /> Gravel Pack From NA To <br /> Additional Details Raraw;p of caving near surface at a white clay horizon, <br /> installed 20' of temporary surface casing. <br /> Development Summary Air/water and air injecting for 3 hours producing around <br /> 5 gpm. Cleaned up well . <br /> Comments, Problems Bottom of Lower Dakota Coal at 74.5' <br /> 15-2-44 <br /> Revised 11/01/86 <br />