Page 1 of 1
<br /> MONITOR WELL LITHOLOGIC LOG
<br /> Monitor Well Name GW-N25(WMOO25)* Geologic Unit Monitored Overburden, Dakota Coal
<br /> Drilling Date 04/21/86 Logged By G. Wendt and Underburden
<br /> Geophysically Logged By None Total Depth Drilled (ft) 33.7
<br /> *Exploration Hole 875-E
<br /> DEPTH (FT) DESCRIPTION AND COMMENTS
<br /> 0.0 - 0.4 SOIL, sandy loam, reddish brown, friable, SE/ME
<br /> 0.4 - 2.0 SANDSTONE, yellowish brown, hard, VE
<br /> 2.0 - 4.0 SANDSTONE, brown, hard and slightly hard, gray SHALE, SE
<br /> 4.0 - 5.0 SHALE, dark gray, slightly hard, NE
<br /> 5.0 - 5.6 SHALE, very dark gray to black, slightly hard, carbonaceous, NE
<br /> 5.6 - 7.5 COAL, Upper Dakota seam, soft, weathered and oxidized, NE
<br /> 7.5 - 8.0 SHALE, very dark gray, slightly hard, carbonaceous, NE
<br /> 8.0 - 11 .0 SANDSTONE, 'light brownish gray, slightly hard to hard, NE
<br /> 11 .0 - 16.2 SANDSTONE, light brown, hard, NE
<br /> 16.2 - 18.4 SHALE, gray to dark gray, slightly hard, NE, yellow sulfur stains
<br /> in fractures, 50% hard light gray sandstone at 18. 1 - 18.4
<br /> 18.4 - 25.7 COAL, Lower Dakota seam, gray shale streaks at 18.84 - 18.86,
<br /> 19.99 - 20.01 and 19.86 - 19.94, few (51/0) dark grayish brown
<br /> carbonaceous shale lamella at 25.6 - 25.7
<br /> 25.7 - .25.9 SHALE, gray, soft to slightly hard
<br /> 25.9 - 28. 1 SANDSTONE, light gray, hard
<br /> 28. 1 - 30.4 SHALE, gray, slightly hard and hard light gray SANDSTONE,
<br /> fractured at 0.5 foot interval
<br /> 30.4 - 31 .6 SHALE, gray, slightly hard to hard, very dark gray carbonaceous
<br /> shale with coal streaks at 30.95 - 31 .25
<br /> 31 .6 - 33.2 SANDSTONE, light gray, extremely hard, 15% gray shale at 31 .6 - 32.2
<br /> and 33.0 - 33.2
<br /> 33.2 - 33.7 SHALE, gray, slightly hard
<br /> Cuttings collected from 0.0 - 17.0 feet, 51/< inch diameter hole
<br /> 3 inch core from 17.0 - 33.7 feet, 4 7/8 inch diameter hole
<br /> 2 inch PVC casing installed to 33.5 feet, slotted at 27.5 - 33.5
<br /> feet, packer at 4.5 feet
<br /> Dry Hole
<br /> NE - Non Effervescent 15-2-60 SE - Slightly Effervescent
<br /> ME - Moderately Effervescent VE - Violently Effervescent
<br /> Revised 11/01/86
<br />
|