MBMG-154593

Montana Bureau of Mines and Geology

Located in Granite County, Montana, this groundwater monitoring location is associated with a water well in the Northern Rocky Mountains Intermontane Basins aquifer systems.

Well Construction

Depth Description
-2.0-138.0 ft 6.0 in diameter steel casing
138.0-138.0 ft 6.0 in diameter open bottom screen
Depth Lithology Description
0.0-1.0 ft unknown TOPSOIL
1.0-2.0 ft unknown MOIST CLAY AND GRAVEL SAND
2.0-19.0 ft unknown DAMP PINKISH BROWN SILTY SAND AND GRAVEL AND COBBLES
19.0-22.0 ft unknown FIRM YELLOW TAN SANDY CLAY
22.0-25.0 ft unknown REDDISH TAN CLAY WITH SOME GRAVEL
25.0-39.0 ft unknown SOFT YELLOW TAN MICA RICH CLAY
39.0-40.0 ft unknown RED BROWN CLAY AND TRACE SAND
40.0-80.0 ft unknown TAN TO BROWN CLAY COARSE SAND AND CLAYSTONE
80.0-118.0 ft unknown HARD TAN TO DARK BROWN CLAYSTONE-TRACES LIGHT YELLOW GREEN BENTONITES- 80-100FT
118.0-122.0 ft unknown BLACK HARD SHALE
122.0-140.0 ft unknown TAN CLAYSTONE TRACES BLACK SHALE-GREEN BENTONITE WHITE BENTONITE HIT WATER AT 140 FT CLEAN (25 GPM)

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