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MISM NO • III III III III IIII III • OFFICE !03 20~~O11B <br />[%FLORATION F1 ~ - __ 999 J, C.P.G. RESIDENCE ]67-l9lO <br />[N OIN [l111N0 GEOLOGIST <br />P.O. BO% 2182 <br />D URANG O, COLORADO 81302 <br />September 25, 1986 <br />SUBJECT: Coal Gulch Mine, La Plata County, Colorado Permit <br />C-84-067, Minor Revision No. 07 <br />INTRODUCTION <br />In lieu of drilling a groundwater well in Section 16, T35N, <br />R10W, Mr. Steve Renner of the Colorado M.L.R.B. agreed in Septem- <br />ber 1986, that detailed geological data illustrating hydrologic <br />characteristics of the formations above the coal seams could be <br />submitted. This decision was based upon the results of probing <br />drill hole AM-5 with a Soiltest DR-762A level probe which in- <br />dicated that the hole was dry. It had been proposed that drill <br />hole AM-5 be used as the groundwater well. This hole penetrates <br />all units above the coal with a T.D. in the Point Lookout Sand- <br />stone. <br />CONCLUSIONS <br />1) The geologic map and section indicate that the Cliff House <br />Sandstone and Upper Menefee Formation would not serve as aqui- <br />fers because of lithologic characteristics and erosional breach- <br />ing downdip by Coal Gulch (See Hydrogeology below and Cross <br />Section). <br />2) Drill hole AM-5 being dry, indicates that discharge from mine <br />portals is not from updip recharge, but more likely from infil- <br />tration of surface runoff into fracturing resulting from early <br />(1) <br />