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Page 1 of 2 <br /> MONITOR WELL LITHOLOGIC LOG <br /> Monitor Well Name GW-N16(WN0016) Geologic Unit Monitored Dakota Coal Underburden <br /> Drilling Date 07/17/80' Logged By J.S. Dingman <br /> Geophysically Logged By None Total Depth Drilled (ft) 108.2 <br /> DEPTH (FT) DESCRIPTION AND COMMENTS <br /> 0 - 4 No Data <br /> 4 - 12 SILT, It brn - it brn-red <br /> 12 - 21 SILTSTONE w/some v fn grnd SANDSTONE, it brn; H 0 at 15' - <br /> began injecting at 21 ' <br /> 21 - 26 SILTSTONE and CLAYSTONE, It brn, v soft <br /> 26 - 33 SILTSTONE and CLAYSTONE, It grey, v soft <br /> 33 - 34 CLAY, white, intbdd w/SILTSTONE and CLAYSTONE <br /> 34 - 37 SANDSTONE, brn, v fn grnd <br /> 37 - 41 HUDSTONE, grey-brn <br /> 41 - 43 CLAY, white intbdd w/brn <br /> 43 - 46 SILTSTONE, brn, soft <br /> 46 - 47 SHALE, carbonaceous, blk-brn <br /> 47 - 69.1 SILTSTONE and SHALE, intbdd, It grey - med grey, bioturbation <br /> structure common <br /> 69. 1 - 76.4 SILTSTONE and SHALE, intbdd, dk grey, occ carbonaceous <br /> 76.4 - 82. 1 SILTSTONE and SHALE, intbdd, It grey at top grading to dk grey <br /> at bottom; at bottom 1 .4' carbonaceous shale <br /> 82. 1 - 82.9 COAL (Upper Dakota) <br /> 82.9 - 98.5 SILTST014E and SHALE, intbdd, it grey to dk grey (v carbonaceous) , <br /> at 88.0' 0. 1 ' thick layer white clay <br /> 98.5 - 104.8 COAL (Lower Dakota) with occ silty 0. 1-0.4' thick stringers, tan-brn <br /> iO4.8 - 108.2 SILTSTONE and SHALE, white-It grey intbdd with occ carbonaceous shales <br /> important Note Because the top 8 feet of this hole, exploration hole 879-C, caved, <br /> the hole had to be abandoned. Replacement hole for well GW-N16 <br /> was moved approximately 30 feet to the west. Remaining portion <br /> of lithology log presented here is from this hole. Note that the <br /> log begins with the top of the Lower Dakota Coal and that it <br /> 15-2-41 Revised 11/01/86 <br />