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Page 1 of _ <br /> MONITOR WELL LITHOLOGIC LOG <br /> Monitor Well Name GW-N23(14MOO23)* Geologic Unit Monitored Overburden, Dakota Coal <br /> Drilling Date 04/20/86 Logged By G. Wendt and Underburden <br /> Geophysically Logged By None Total Depth Drilled (ft) ii _n <br /> *Exploration Hole 873-E <br /> DEPTH (FT) DESCRIPTION AND COMMENTS <br /> 0. SANDSTONE. <br /> 2.0 - 3.0 SHALE. <br /> 3.0 - 4.0 SHALE. very dark gra.y. slightly hard- NF <br /> 4.0 - 5.0 SHALE, <br /> encountered coal at 4.6 feet. <br /> 5.0 - 6.8 COAL,Upper Dakota seam <br /> 6.8 - 8.0 SHALEgray, slightly hard light r v hard sandstonp at <br /> 7.5 - 8.0. N <br /> 3.0 - 10.0 SANDSTONE light brownish gray. slightlyr <br /> 10.0 - 13.0 SANDSTONE brown hard to very hard encountered dark oray slightly <br /> hard shale at 12.9 NE <br /> 13.0 - 14.3 SHALE, gray, slightly hard to hard NE <br /> 14.3 - 14.6 SHALE, gray, silty, yellowish brown to reddish brown slightly hard <br /> to hard, highly fractured from 14.5 - 14.6, NE <br /> 14.6 - 16.0 SHALE, gray, slightly hard to hard, yellow 0.01 foot sulfur deposits <br /> in fractured at 0. 1 foot intervals, slightly sandy and light gray <br /> at 15.8 - 16.0, white to clear gypsum crystals at 15.95 - 16.00 NE <br /> - 16.0 - 23.6 COAL, Lower Dakota seam, light gray shale partings at 16.6 -16.9, <br /> 18.0 - 18. 1 and 18.15 - 13.20, high sulfur content from 16.0 - 16.6 <br /> 23.6 - 24.6 SHALE, gray, slightly hard to hard, fractures occur at 0. 1 - 0.2 <br /> foot intervals, very dark gray carbonaceous shale at 23.6 - 23.7 NE <br /> 24.6 - 27.0 SANDSTONE, light gray, extremely hard, indurated, fractures occur <br /> at 0.5 foot intervals, 3 percent black organic lamella at 25.5 - <br /> 27.0, NE <br /> 27.0 - 28. 1 ISHALE, gray, slightly hard to hard, fractures occur at 0.2 foot <br /> intervals, NE <br /> 15-2-55 <br /> Revised 11/01/86 <br />