
B&B Well Drilling
Leonard, MI48367
The typical stratigraphy for Leonard and nearby regions is a sequence of surficial sand and gravel, thick interbedded clay or clay-rich materials, often with deeper water-bearing sands or gravels, and possible thin zones of boulders or hardpan. Most residential wells target sand/gravel aquifers between 70–150 ft, with static water levels generally 30–60 ft below grade.
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A geological estimate for the Leonard area.
Typical Well Depth
Static Water Level
Recommended Method
Based on analysis of sampled well logs, the subsurface geology around Leonard is commonly: (0–1 ft) topsoil, (1–40 ft) sand/gravel or sandy clay, (40–110 ft) predominantly clay with interbeds of sand, gravel, or clay/gravel mixtures, transitioning at depth (110–200 ft) to sandy/gravelly aquifers that provide the primary water supply. The most typical residential wells are completed at 120–150 ft, with high capacity/large residential yields possible to 180–200 ft. Static water levels are most commonly 30–60 ft. Nearly all wells use rotary mud drilling, 5 in. PVC casing to nearly total depth, and bentonite slurry grout.
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 1 ft | Topsoil | Thin organic topsoil layer | Color: Brown Hardness: Soft |
| 1 – 36 ft | Sand/Gravel/Sandy Clay | Sand and gravel, sometimes mixed with clay or described as sandy clay; water bearing in parts | Color: Yellow-brown/gray Hardness: Loose to firm |
| 36 – 110 ft | Clay (with interbeds of gravel or sand) | Predominantly clay, sometimes with gravel/sand streaks; acts as aquitard, may include thin hardpan/clayey gravel layers | Color: Gray/yellow/tan Hardness: Firm to stiff |
| 110 – 145 ft | Sand/Gravel Water Bearing | Clean to mixed sand and gravel, main water-bearing formation tapped by screens | Color: Yellow-gray Hardness: Loose |
| 145 – 180 ft | Clay with Gravel/Sand and Stones | Alternating clay with more coarse material and minor stones or hardpan | Color: Gray Hardness: Firm to hard |
| 180 – 200 ft | Gravel/Coarse Sand | Gravel and coarse sand, often the lowest screened aquifer | Color: Gray-yellow Hardness: Loose |