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Figure 15. General Well Construction Schematic (snot to <br />scale} for Overburden and Alluvial Monitoring <br />Wells Drilled During 1986*, Nucla and Nucla <br />East Mines, Montrose County, Colorado <br />• ~-- End cap (vented) <br />Cement (type II) <br /> ~ ~ <br /> , <br />. .~. Medium Sand (~1') <br /> '•~ <br />•. •'• <br />. <br />~ on top of gravel <br /> <br />.•~:~ , <br />• .. <br />•~~ <br /> ,• <br /> <br />;: <br />•. . <br />• <br /> ; <br />~ ,. <br /> <br />•;~~ . ... <br />4"id <br />h 4 <br /> , ; <br />, pvc sc <br />0 <br /> •• <br />• ~ <br />••• bellend <br /> . <br />;:. . ,. <br /> .: <br /> :.•. <br />: <br /> •,• .; <br /> ;•, .•.. <br /> •' •: •• 6 3/4" bore hole <br /> .•.• <br />' ,•. <br /> ' . •,•. <br /> <br /> <br /> ,., . <br />. <br /> .~ <br />• <br />Alluvium or '.'., 0.02 or 0.05 mi17- <br />Dakota Coal :'' - ~•'.' slot 4"id pvc sch <br />rde <br />Overb '• _ :; 40 th <br />t <br />h <br />n <br />u ~;: ; <br />. roug <br />ou <br />sat- <br /> = '• <br /> . <br />; • <br />~ urated zone <br /> . - ,,~ <br /> .; ,• _ ~, <br />: <br /> .•. - <br />_ ,. <br />. <br />' <br /> .. <br />•. <br /> <br />_ . <br />, <br />.. <br /> . •. <br />• <br />. .,~• <br />' <br />" <br /> . ; . <br />.. <3/8 <br />pea gravel <br /> .•'• = :, ' within 5' of ground <br /> .• <br />• <br />. ~ <br />_ <br />: •.' <br />. <br />surface <br /> , . <br />• <br /> , . - .. <br />• <br /> •,• - •.. <br /> <br /> • _ : <br />• <br /> ~; <br />• <br />- <br />- • <br />. <br />. <br />. <br /> ,.. <br />. <br />_ , <br />, <br />• <br /> . , <br />. . <br /> <br /> <br /> <br /> ., <br /> :.: :.• <br />Bottom cap <br />* Schematic is pertinent to wells GIJ-N15, GlJ- <br />N18, GV1-N18P1, GVJ-N21, Gad-N22 <br />r1 <br />LJ <br />71 <br />