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MONITOR WELL DRILLING AND CONSTRUCTION SUh114ARY <br />NUCLA AND NUCLA EAST MINES <br />Monitor Well Name GW-N25(I1h10025) Geologic Unit Monitored _ Overburden, Dakota Coal• i <br />Elevation Ground Level (ft-anisl) 57?~ 771 _ Underburden <br />Location: N fiDg151 q7~ E_j,117019 8R TAN R16 W S 36 A D A <br />Total Drill Depth (ft) 33.7 <br />Total Well Depth (ft) J3,5 <br />Drilling Details <br />Borehole Diameter (in) 5 1/4 to 17.0; 4 7/8 to 33.7 Riy S~eedstar 1500 __ <br />Bits Tricone and Core Driller Allan Chiles _ <br />Drilling Fluid Air <br />Additional Uetails Exploration Hole 875-E <br /> <br />Drilling/Construction: Start 04/21/36 Finish 04/21/86 <br />Lithologic Log (Y/N) Y <br />Geophysical Log (Y/tl) N <br />Construction Details <br />Casing Specs: Blank 2~~ id PVC sch40 Perforated 1/8" saw slot <br />Perforated Interval(s) 27.5 - 33.5 <br />Packer Set At 5.0' <br />Cement From ;~.;:_ <br />Bentonite Slurry From <br />Gravel Pack Fro+n <br />Additional Details rr <br />Development Sunenary <br />To ~,_n .- <br />To <br />7u <br />i~J <br />Conunents, Problems_Top of Lower Dakota Coal at 18.4'. Bottom at Lovrer Dakota _ . <br />Cnal at 25.7'. _ <br />D-2E <br />Revised 11/(11/86 <br />