Quincy region wells typically penetrate thick sequences of clay, sand, and gravel, often becoming coarser with depth, with occasional sandstone, shale, or bedrock layers encountered in deeper wells.
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A geological estimate for the Quincy area.
Typical Well Depth
Static Water Level
Recommended Method
Based on a representative sample of wells from Quincy and the surrounding area, the common stratigraphy consists of surficial topsoil, followed by alternating layers of clay (often brown or gray, sometimes mixed with gravel or stones) and significant sand and/or gravel deposits. Deeper wells may penetrate cemented or consolidated materials such as sandstone or even shale, with some wells ending in water-bearing gravel or bedrock (sandstone/shale). Most residential wells achieve reliable yields from sand/gravel aquifers between 25 and 90 ft depth, while higher-capacity or public supply wells are sometimes screened deeper or into bedrock/sandstone layers. Static water levels typically range between 12 and 34 ft below grade. PVC or steel casing is used with bentonite or cement grout. Yield rates generally meet or exceed 10-15 GPM, with some higher yields possible from coarse zones.
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 2 ft | Topsoil | Surface soils, variable organic content | Color: Brown to dark Hardness: Soft |
| 2 – 18 ft | Clay with gravel and stones | Brown or gray clay often mixed with gravel or stones, occasional sandy lenses | Color: Brown to gray Hardness: Firm to stiff |
| 18 – 40 ft | Gravelly sand and sand | Sand and gravel, generally water-bearing; locally stoney or becoming coarser downward | Color: Brown, light gray Hardness: Loose to medium |
| 40 – 65 ft | Gray clay / Sandy clay | Dense clay, often gray, sometimes sandy or with minor gravel; acts as confining layer in some wells | Color: Gray Hardness: Hard |
| 65 – 80 ft | Sand and/or gravel (water-bearing) | Clean to silty, often main aquifer zone for domestic use | Color: Gray to light brown Hardness: Medium |
| 80 – 100 ft | Clay, shale, or fine sand | Variable—some wells encounter additional gray clay, sandy clay, or shale; others intercept sandstone or continue in coarse sand/gravel | Color: Gray, blue-gray, or brown Hardness: Very hard (shale/sandstone), dense (clay) |
| 100 – 112 ft | Coarse sand/gravel or sandstone | Final water-bearing zone or consolidated bedrock contact | Color: Gray to brown Hardness: Loose to hard |