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Figure 15-3 <br />Generalized Well Construction Schematic for <br />Overburden and Alluvial Monitoring Wells Drilled During <br />NH 1 and NH2 Mines, Montrose County, Colorado <br />End Cap (vented) <br />Ground Surface <br />Cement (Type II) <br />from 5' to <br />ground surfacce <br />Medium Sand ( 1') <br />on top of gravel <br />Alluvium or <br />Dakota Coal, 4" id pvc sch 40 <br />Overburden <br />.' 6 3/4" bore hole <br />:~ .~:•. <br /> 5' of skill saw slotted <br /> ' 2" id <br />vc sch 40 <br /> . p <br />1986* <br />~ tsor,LOm map <br />*Schematic is pertinent to well's GW-N15, GW-N18 & GW-N18P] <br />GW-N21, and GW-N22 15-16 <br />w.r.a o~roa/n <br />