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Figure 15-2 <br />Generalized Well Construction Schematic for <br />Composite (Overburden, Dakota Coal, and Underburden) Wells <br />Drilled in The Scraper Area* During 1986 <br />NH1 Mine, Montrose County, Colorado <br />End Cap (vented) <br />Ground Surface <br />Cement (Type II) <br />from 5' to <br />ground surfacce <br />Rubber Packer <br />Overburden, <br />Dakota Coal, <br />and Underburden <br />(=8.9') <br />Open annulus <br />2" id pvc sch 40 <br />7/8" bore hole <br />5' of skill saw slotted <br />2" id pvc sch 40 <br />~ tsottom yap <br />*Schematic is pertinent to well's GW-N23, Gw-N24 & Gw-N25 <br />15-15 <br />o~~m <br />