Laserfiche WebLink
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 />