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148 <br />WELL FBR 4 <br /> <br />Date Started: 9/10/79 <br />Date Completed: 9/12/79 <br />Location: SW 1/4, SW 1/4, Sec 12 T5N R86W <br />Total Depth: 830 ft <br />Well Casing Length: 799.9 ft <br />Elevation Well Casing Top: 7027.6 ft <br />Ground Surface Elevation: 7025.7 ft <br />Drilled by: T. Leach <br />Starner Drilling <br />Rig: Gardner-Denver Air Rotary, <br />6 1/4 inch tricone bit <br />Logged by: D. Lundy, Geologist <br />Brown and Caldwell <br />Geophysical Logging by: <br />B. Navakovich, Geologist <br />Century Geophysical Corp. <br />Depth <br />range, Character of Materials <br />feet <br />0-2 TOPSOIL grey-brown; clayey, sandy silt; soft; dry to moist <br />2-20 SANDSTONE AND SHALE light grey to tan and medium grey to brown, <br />respectively; interbeds less than 5 ft thick; sandstone silty <br />to fine grained; soft to moderately hard; dry <br />20-33 SHALE medium to dark grey; massive to fissile bedding; firm; dry <br />33-39 SANDSTONE light grey; very fine to medium, soft to hard; dry <br />39-42 LIMESTONE medium grey; microcrystalline; fine sand; very hard; <br />dry <br />42-165 SANDSTONE light grey; silty, very fine to medium, mostly fine; <br />soft to hard; wet below 70 ft; occasional thin beds of grey <br />siltstone 145-165 ft <br />165-180 SILTSTONE AND SHALE medium and dark grey, respectively; <br />moderately hard; occasional thin, grey sandstone beds; wet <br />180-200 SANDSTONE medium grey; very fine to medium, mostly fine; soft <br />to moderately hard; wet <br />200-805 SILTSTONE AND SHALE medium grey to black; massive to fissile; <br />hard; occasional thin sandstone beds 235-265 ft <br />805-813 SANDSTONE light grey; silty to medium; mostly fine; calc- <br />cemented; hard <br />813-830 SANDSTONE, SHALE AND COAL light grey, dark grey and black, <br />respectively; sandstone very fine to medium, locally pyritic; <br />shale fissile; coal seams 815.5-816.5 and 826-828 ft <br />