MBMG-151188

Montana Bureau of Mines and Geology

Located in Missoula 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
0.0-35.0 ft 6.0 in diameter steel casing
20.0-35.0 ft 6.0 in diameter steel screen
Depth Lithology Description
0.0-5.0 ft unknown SOIL: HUMIC -SANDY SOIL WITH COARSE SAND AND 5MM PEBBLES.
5.0-10.0 ft unknown SAND: BUFF-COLORED -COARSER SAND- WITH SOME MICA FLAKES AND QUARTZ PEBBLES. PEBBLES UP TO 1.5CM.
10.0-15.0 ft unknown SAND: COARSER SAND THAN @ 10'- 2-3CM PEBBLES - SOME GRANITE - WITH CHIPS - WITH COARSE SAND.
15.0-20.0 ft unknown SAND: VERY COARSE SAND - LOTS OF QUARTZ SAND - MICA - QUARTZ AND SILTITE PEBBLES AS WELL AS GRANITE PEBBLES. HIT WATER AT 19' - EASY DRILLING - NO NEED TO DRIVE CASING. FROM 5' TO 20' VERY LITTLE FINES - ALL SANDS.
20.0-25.0 ft unknown SAND: COARSE SAND WITH A FEW PEBBLES OF RED ARGILLITE.
25.0-30.0 ft unknown SAND: COARSE SAND WITH A FEW PEBBLES OF RED AND GREEN ARGILLITE.
30.0-35.0 ft unknown SAND: COARSE QUARTZ SAND WITH A FEW LARGE PEBBLES - TOOK 30 SECONDS TO DRILL FROM 20' TO 35' - ALL SAND.
35.0-37.0 ft unknown SAND: COARSE SAND WITH LOTS OF LARGE (5CM) PEBBLES OF RED ARGILLITE AND QUARTZITE - A FEW MUD BALLS OR CLAY STREAKS AT 37' (MINOR CREAM TO TAN CLAY).

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