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Figure 14. General Well Construction Schematic (not to <br /> scale) for Dakota Coal and Dakota Coal Under- <br /> burden Wells Drilled During 1986*, Nucla and <br /> Nucla East Mines, Montrose County, Colorado <br /> End cap (vented) <br /> Ground Sur c <br /> Cement (Type II) <br /> from 5' to ground <br /> surface <br /> 4"id pvc sch 40 bellend <br /> Bentonite Slurry <br /> o' <br /> = ` 7 7/8" Bore hole <br /> Cement (Type V) <br /> Cement Basket (Steel ) <br /> Bentonite pellets (Volclay) <br /> Rubber packer <br /> 6 3/4" or 7 7/0" Bore hole <br /> Dakota Coal = within completion interval <br /> or Dakota <br /> Coal Under- = 0.02 or 0.05 mill slot 4" id <br /> burden = pvc sch 40 within completion <br /> interval <br /> Open annulus <br /> Z <br /> End Cap <br /> *Schematic is pertinent to wells GU-N13, <br /> GW-N14, GW-N16, GW-N16P1, GW-N17, GW-N17P1, <br /> GW-N19, and GW- N20 <br /> 70 <br />