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MONITOR WELL DRILLING AND CONSTRUCTION SUMMARY <br />• NUCLA AND NUCLA EAST MINES <br />Monitor Well Name GW-tJ15 (WN0015) Geologic Unit Monitored Dakota Coal Overburden <br />Elevation Ground Level (ft-amsl) 5712.55 <br />Location: N 601939.195 E 1,116089.86 T47 N R 16 W S36 D A C _ <br />Total Drill Depth (ft) 79.8 <br />Total Well Depth (ft) 79.8 <br />Drilling Details <br />Borehole Diameter (in) 6 3/4 <br />Bits Tricone Driller_ <br />Drilling Fluid Air and Mud <br />Additional Details <br />• <br />Drilling/Construction <br />Lithologic Log (Y/N)_ <br />Geophysical Log (Y/N) <br />Start <br />N <br />N <br />06/16/86 Finish 06/17/86 <br />Construction Details <br />Casing Specs: Blank 4" id PVC sch 40 <br />Perforated Interval(s) 15.3 - 79.8 <br />Packer and Cement Basket Set At NA <br />Cement From 5.0' To <br />Rig Speedstar 1500 <br />Ground Surface <br />Bentonite Slurry From NA To <br />Gravel Pack From 5.0' To 79.8 <br />Additional Details Gravel pack generally less than 3/8" in diameter but <br />some as large as 1"; also contained some dried twigs. <br />Development Summary Developed for 15 min. on 06/16/86; developed further on <br />06/17/86 for 3 '/: hours ultimately producing 1 gpm with @ 1 tsp silt per min. <br />• Comments, Problems <br />Allan Chiles <br />Perforated 0.02" slot <br />15-2-8 Revised 11/01/86 <br />