1986-12-31_REPORT - C1981008 (7)

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Page 1 of -2- MONITOR WELL LITHOLOGIC LOG Monitor Well Name GW-N23(!4NO023)* Geologic Unit Monitored Overburden, Dakota Coal Drilling Date 04/20/86 Logged By G. Wendt and Underburden Geophysically Logged By None Total Depth Drilled (ft) _11 _n *Exploration Hole 873-E DEPTH (FT) DESCRIPTION AND COMMENTS SANDSTONE. 2 - 2.0 - 3.0 SHALE. r 3.0 0 _ SHALE very dark dray, slightly hard, NF 4.0 - 5.0_ . _ ( SHAL very r encountered coal at 4,6 feet. 5.0 - 6.8 _' COAL Uo er Dakota seam 6.8 - 8.0 ;SHALE, grav, slightly hard light gray slightly hard sandstone at i 75 - 80 NE 8.0 - 10.0 11SANDSTONE, light brownish gray. slightly hard to hard. NE 10.0 - 13.0 SANDSTONE, brown, hard to very hard encountered dark oray slightly hard shale at 12.9 NE 13.0 - 14.3 SHALE, gray, slightly hard to hard NE 14.3 - 14.6 SHALE, gray, silty, yellowish brown to reddish brown slightly hard to hard, highly fractured from 14.5 - 14.6, NE 14.6 - 16.0 SHALE, pray, slightly hard to hard, yellow 0.01 foot sulfur deposits in fractured at 0.1 foot intervals, slightly sandy and light gray at 15.8 - 16.0, white to clear gypsum crystals at 15.95 - 16.00 NE 16.0 - 23.6 COAL, Lower Dakota seam, light gray shale partings at 16.6 -16.9, 18.0 - 18. 1 and 18.15 - 13.20, high sulfur content from 16.0 - 16.6 23.6 - 24.6 SHALE, gray, slightly hard to hard, fractures occur at 0. 1 - 0.2 foot intervals, very dark gray carbonaceous shale at 23.6 - 23.7 PJE 24.6 - 27.0 SANDSTONE, light gray, extremely hard, indurated fractures occur at 0.5 foot intervals, 3 oercent black organic lamella at 25.5 - 27.0, NE 27.0 - 28. 1 SHALE, gray, slightly hard to hard, fractures occur at 0.2 foot intervals, NE D-22 Revised 11/01/86