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Figure 14. General Well Construction Schematic (n~~t to <br />scale) far Dakota Coal and Dakota Coal Under- <br />burden (Jells Drilled During 198ii*, Nucla and <br />Nucla East Mines, Hontrose County, Colorado <br />• <br />End cap (vented) <br />nd <br />Cement (Type II)- <br />from 5' to ground <br />surface <br />Cement (Type V) <br />;; ~; :-. <br />~••~ •' 4"id pvc sch 40 bellend <br />~:.;• ; ;; <br />.'.: <br />;•e ,.~ ;. <br />;y=;: :;°.•~ -Bentonite Slurry <br />'~ <br />::.'. <br />•~. <br />o•' 7 7/8" Bore hole <br />•' •. • <br />Cement Basket (Steel) <br />Bentonite pellets (Volclay) <br />Rubber packer <br />Dakota Loal <br />or Dakota <br />Coal Under- <br />burden <br />_- - 6 3/4" or 7 7/~" Bore hole <br />within completion interval <br />0.02 or 0.05 mill slot 4" id <br />pvc sc:h 40 within comoletion <br />= interval <br />- Open annulus <br />d Cap <br />*Schematic is pertinent to wells GII-N13, <br />GlJ-N14, GlJ-N16, GW-N1GP1, G!9-N17, GW-N17P1, <br />GW-N19, and G41-N20 <br />70 <br />