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• MONITOR WELL DRILLING AND CONSTRUCTION SUP1f4ARY <br />NUCLA AND NUCLA EAST MINES <br />Drilling Fluid_ <br />Additional Details <br />Monitor Well Name GW-N16(WN0016) Geologic Unit Monitored Dakota Coal Underburden <br />Elevation Ground Level (ft-amsl) 5673.70 <br />Location: N 597934.641 E 1,117870.98 T 46 N R 15 W S G B C C _ <br />Total Drill Depth (ft) 158,0 <br />Total Well Deptii (ft) 158.0 <br />7 7/8" <br />Bits Tricone Driller <br />Drilling Details <br />Borehole Diameter (in) <br />Drilling/Construction: <br />Litiiologic Log (Y/N) Y <br />• Geophysical Log (Y/N) N <br />Packer and Cement Basket Set At <br />Cement From 89.2 <br />Bentonite Slurry From S. 0' <br />Cleaned out hole with MAGCO LMP <br />Start 06/26/86 <br />Construction Uetails <br />Casing Specs: Blank 4" id PVC sch 40 <br />Perforated Interval(s) 1i2.2 - 158.0 <br />Finish 06/28/86 <br />Perforated 0.02" slot <br />To 112.2 <br />To 89.2 <br />Gravel Pack From WA To <br />Additional Details While setting the cement plug, approx. 1 gallon water came <br />out of well pipe. Capped pipe immediately and hoped cement did not pass the <br />packer. <br />Development Sunmiary No cement in completion interval. Developed for 2.5 hours <br />and made 2 gpm. <br /> <br />Comments, Proble~~~s Contact between Lower Dakota Coal and Underburden at <br />Air and Mud <br />108.0 feet <br />Allan Chiles <br />Rig Speedstar i50U <br />112.2 <br />0-~ Revised 11/01/86 <br />