MBMG-3802

Montana Bureau of Mines and Geology

Located in Phillips County, Montana, this groundwater monitoring location is associated with a water well in the Sand and gravel aquifers (glaciated regions).

Well Construction

Depth Description
-1.0-76.0 ft 4.0 in diameter pvc-sched40 casing
66.0-76.0 ft 4.0 in diameter slotted casing screen
Depth Lithology Description
0.0-5.0 ft unknown ROCKY YELLOW BROWN TILL - SOIL ZONE
5.0-10.0 ft unknown BROWN RUST STAINED SOFT TILL
10.0-15.0 ft unknown BROWN RUST STAINED ROCK HARD TILL
15.0-20.0 ft unknown DARK GRAY BROWN ROCKY TILL; RUST STAINS LIGNITE CLASTS - ROCKY AT 18-19
20.0-25.0 ft unknown DARK GRAY BROWN SANDY PEBBLY TILL
25.0-30.0 ft unknown AS ABOVE BUT WITH LIGNITE FLECKS AND WHITE MOTTLES - PEBBLES TO 2 IN
30.0-35.0 ft unknown DARK BROWN TILL - PEBBLY - TRACES OF DARK BLUE GRAY TILL - LIGNITIC FLAKES
35.0-40.0 ft unknown DARK GRAY BROWN TILL WITH MORE DARK GRAY BLUE TILL DRY SAND AND GRAVEL BETWEEN 38-39. TOOK WATER
40.0-45.0 ft unknown DARK GRAY BLUE PLASTIC TILL - ROCKY
45.0-50.0 ft unknown DARK GRAY BLUE PEBBLY TILL - GRAVELLY AT 43-45 PEBBLES TO 1 IN - LOSING WATER IN SANDY ZONES
50.0-55.0 ft unknown DARK BLUE GRAY TILL INTERBEDDED WITH SAND AND GRAVEL
55.0-60.0 ft unknown MAKING WATER AT 55- MORE AT 57 BUT PROBABLY IN SAND AND GRAVEL - 60% CUTTINGS DARK GRAY BLUE TILL - 40% SAND AND GRAVEL TO 2 IN
60.0-65.0 ft unknown SAND AND GRAVEL MIXED WITH BLUE TILL WATER DEC BY 62 FT - MUDDED OFF?
65.0-70.0 ft unknown VERY ROCKY BETWEEN 68-70 SAND AND GRAVEL DOWN TO 72 FT - PEA GRAVEL TO 3/4 IN
70.0-84.0 ft unknown SAND AND GRAVEL TO 2 IN - LOSING SOME WATER - PEA GRAVEL TO 1 IN GRAVEL ENDS AT 84
84.0-93.0 ft unknown DRILLS LIKE TILL BUT CUTTINGS MOSTLY SAND AND GRAVEL -PROBABLY A SAND ZONE
93.0-101.0 ft unknown PEA TO 2 IN GRAVEL TO 101 FT - CHECKED CUTTINGS CLOSELY - NO ERRATICS - DRILLS LIKE SHALE AT 101 HIGH PULLDOWN AND ROTARY PRESSURE
101.0-115.0 ft unknown DARK BLUE GRAY BEARPAW SHALE

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