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Figure 16. General Well Construction Schematic (not to <br /> scale) for Composite (Overburden, Dakota Coal , <br /> and Underburden) Wells Drilled in The Scraper <br /> Area* During 1986, Nucla Mine, Montrose <br /> County, Colorado <br /> End cap (vented) <br /> Gro rface <br /> Cement (Type II) <br /> from 5' to <br /> ground surface <br /> Rubber Packer <br /> Open annulus <br /> Overburden, <br /> Dakota Coal , 2"id pvc sch 40 <br /> and Under- <br /> burden ( = 8.0 ' ) <br /> 4 7/8" bore hole <br /> 5' of skill saw slotted <br /> 2"id pvc sch 40 <br /> Bottom cap <br /> *Schematic is pertinent to wells GW-N23, GW-N24 <br /> and GW-N25 <br /> 72 <br />