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NiV)Vq <br />F 3 .T'_'J l .a P: C V <br />iNGIN2Er+1 Hsi <br />• rRtl7 M. JOMNSOfV. C.~. <br />G~CL^..^.IS <br />P.O. BOX 21E2 <br />D URANG O. COLORADO 81302 <br />September 25, 1986 <br />OFFICE !C] 1IT C~., <br />RESIO EMCE 36T~]]d~ <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 acui- <br />fees 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 />