Dahl Well Drilling LLC
Glenwood City, WI 54013
The typical geological profile for the Knapp area consists of surficial sand/sandy clay, a thick section of sand and/or gravel and clay, followed by one or more sandstone layers which serve as the main aquifer.
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Open guide →A geological estimate for the Knapp area.
Based on averaging lithological descriptions and depths from multiple wells, the representative stratigraphy includes: (1) a surface layer of sand or sandy clay (sometimes with gravel), (2) zones of clay or silt interbedded with sand and/or gravel, and (3) a thick, regionally extensive sequence of sandstone, often light brown or gray and hard, starting typically between 60-100 feet and extending to well bottoms between 114-160 feet. Static water levels typically range from 28-90 feet below surface, and most area wells encounter sufficient water yield at depths of approximately 90-135 feet. The sandstone aquifer is the primary water-producing zone.
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 10 ft | Sand/Sandy Clay | Tan or brown, soft/loose sand, often mixed with some clay or gravel; topsoil at very surface. | Color: Tan/Brown Hardness: Soft/Loose |
| 10 – 40 ft | Sand and Gravel, Locally Sandy Clay or Silt, Minor Clay | Brown or tan, caving/non-caving sand and gravel with local clay or silt interbeds. | Color: Brown/Tan Hardness: Soft/Unconsolidated |
| 40 – 75 ft | Clay or Sandy Clay/Interbedded Sand | Brown or gray clay and sandy clay, local lenses/slabs of silt or hardpan, occasional fiberglass clay and local shale interbeds. | Color: Brown/Gray Hardness: Soft to Stiff |
| 75 – 95 ft | Transition Sand/Gravel | Tan or yellow-brown, slightly coarser sand transitioning to sandstone, sometimes with gravel. | Color: Tan/Yellow/Brown Hardness: Medium/Loose |
| 95 – 135 ft | Sandstone Aquifer | Light brown, tan, or gray hard to firm sandstone; primary water bearing zone. May commence as semi-firm or soft, grading quickly to hard. | Color: Light Brown/Gray/Tan Hardness: Firm to Hard |
| 135 – 150 ft | Lower Sandstone/Higher Competence | Hard or firm sandstone, gray or tan; base of most wells. Not always penetrated in residential wells. | Color: Gray/Tan Hardness: Hard |