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Figure 15-4 <br />Generalized Well Construction Schematic for <br />Dakota Coal and Dakota Coal Underburden Wells Drilled <br />During 1986*, NH 1 and NH2 Mines <br />Montrose County, Colorado <br />End Cap (vented) <br />Ground Surface <br />Cement (Type II) <br />from 5' to <br />ground surfacce <br />4" id pvc sch 40 bellend <br />Cement (Type V) <br />Cement Basket (Steel) <br />Bentonite pellets (Volclay) <br />7 7/8" bore hole <br />Bentonite Slurry <br />Dakkota coal 6 3/4" or 7 7/8" Borehole <br />or Dakota Coal within completion interval <br />U d b d <br />n er ur en 0.02 or 0.05 mill slot 4" id <br /> 40 ithi c <br />l <br />ti <br /> vc sc <br />~nterva w <br />n omp <br />e <br />~ <br />Bottom Cap <br />*Schematic is pertinent to well"s GW-N 13, GW- N 14, Gw-N 16 <br />GW-N16P1, GW-N17, GW-N17P1, GW-N19, <br />15-17 GW- N20 ~„_,,,,,,,,, <br />