
Griffin Well Drilling & Pump Repair
Oakley, MI48649
Oakley area wells predominantly penetrate alternating clay and sand (with some gravel) layers, transitioning to shale and sandstone at depth, with domestic wells most commonly 90-130 ft deep.
Showing contractors within 60 miles of Oakley. 78 results found.
A geological estimate for the Oakley area.
Typical Well Depth
Static Water Level
Recommended Method
The representative geological profile for the Oakley region consists of an upper sequence of interbedded clay and sand layers, occasionally with gravel. These unconsolidated deposits typically range to 90-100 ft below ground surface, followed by a bedrock transition featuring shale and thick sandstone, sometimes alternating with further shale. Typical residential wells targeting 5-15+ GPM generally terminate in the deeper sand/gravel layer above bedrock or are completed in shallow sandstone, commonly at 90-130 ft. High-capacity wells (for agriculture or municipal supply) are cased deeper, often into thicker sandstone up to 180 ft. Nearly all wells are constructed using rotary mud methods with PVC casing set through the unconsolidated deposits and grouted with bentonite slurry.
Depth (Feet) | Formation Type | Description | Characteristics |
---|---|---|---|
0 – 3 ft | Topsoil/Sand | Brown sand or topsoil, surface soils | Color: Brown Hardness: Soft |
3 – 25 ft | Clay | Dense brown/gray clay, sometimes sandy; predominant in upper profile | Color: Brown/Gray Hardness: Medium |
25 – 35 ft | Sand/Gravel | Clean medium sand or sand with some gravel, moderate to high permeability | Color: Gray/Light brown Hardness: Loose-Moderate |
35 – 60 ft | Clay | Thick clay, occasional sand lenses; acts as an aquitard | Color: Gray Hardness: Firm |
60 – 90 ft | Sand/Sand & Gravel | Major drinking water aquifer: medium/fine gray sand, with coarse gravel in places; main target for residential wells | Color: Gray Hardness: Medium |
90 – 100 ft | Clay | Dense gray clay, transition to bedrock | Color: Gray Hardness: Hard |
100 – 110 ft | Shale | Soft gray shale, often water bearing at top of bedrock | Color: Gray-green Hardness: Soft rock |
110 – 155 ft | Sandstone | Greenish, hard sandstone, reliable yield for deeper wells, good aquifer | Color: Green-gray Hardness: Hard |
155 – 182 ft | Shale and Sandstone | Alternating thin shale and thick sandstone layers, with water potential decreasing with depth | Color: Gray/Green Hardness: Variable |