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MONITOR WELL DRILLING AND CONSTRUCTION SUMMARY <br />• NUCLA AND NUCLA EAST MINES <br />Monitor Well Name GlJ-IJi3(WN0013) Geologic Unit Monitored Dakota Coal Underburden <br />Elevation Ground Level (ft-amsl) 5710.82 <br />Location: N 601 969.903 E 1,116091.37 T 47 N R 16 W S 36 D A C <br />Total Drill Depth (ft) 147.0 <br />Total Well Depth (ft) 145.6 <br />Drilling Details <br />Borehole Diameter (in )7 7/8 to 97.0; 6 3/4 to 147.0 Rig Speedstar 15DU <br />Bits Tricone Driller Allan Chiles <br />Drilling Fluid Air and water injection <br />Additional Details before setting casing, cleaned out hole with mist foam <br />Drilling/Construction: <br />Lithologic Loy (Y/N) Y <br />Geophysical Log (Y/N) N <br />• <br />Construction Details <br />Casing Specs: Blank 4" id PVC sch 40 Perforated U.02" slot <br />Perforated Interval(s) 98.7' - 145.6' <br />Packer and Cement Basket Set At 98.7' <br />Cement Froin 90.U' To 9Fi•7' <br />Bentonite Slurry From 5.0' To 90.0' <br />Gravel Pack Frwn NA Tv <br />Additional Details Because casing could not make T.D., pulled casing and <br />reamed with mud. Cleaned hole with i4AGC0 LMP. (Continued on following page) <br />Development Sunmiary Airlift while injecting with water for two hours; airlift <br />(no water injection) for 1 '/: hours. (Cleaned up, making 2 gpm) <br />Coinrrients, Problems Took 4 days to construct well because drillers had little to no <br />drilling experience and had never used a mud pump. Bore hole used for r~ell <br />was exploration hole number 851-C. Contac? between Lower Dakota Coal and <br />Underburden (~ 94.4' <br />Start 06/10/86 Finish 06/14/56 <br />D-1 - Revised 11/01/86 <br />