Beaman Well & Pump LLC.
Rockford, IL61109
The typical Burlington area well profile consists of surficial clay (often with gravel), grading into layers of sand and gravel, with deeper sections encountering hardpan or clay/gravel interbeds. In some areas, limestone bedrock is present below 100 ft.
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A geological estimate for the Burlington area.
Typical Well Depth
Static Water Level
Recommended Method
Based on multiple well logs from Burlington and surrounding rural areas, the most representative geologic sequence is: (1) a surface to ~20 ft clay (sometimes described as yellow, brown, or with gravel), (2) an extensive sand and gravel and/or clayey sand and gravel layer from ~20-60+ ft, (3) hardpan or dense clay/gravel in some logs from 24-43+ ft, (4) deeper, another sand/gravel or sand/gravel/clay mix continuing to 100+ ft, and (5) limestone bedrock encountered in some locations, typically beyond 100 ft. The common residential well targets sand and gravel aquifers between 40 and 100 ft, yielding 10-30+ gpm, with common casing set to near the base of the major sand/gravel aquifer. Static water levels range from 14 to 30 ft below surface. High capacity or deeper wells either extend sand/gravel completion or are finished into limestone below 100 ft.
Depth (Feet) | Formation Type | Description | Characteristics |
---|---|---|---|
0 – 20 ft | CLAY (some gravel possible) | Yellow, brown, or red clay, sometimes mixed with gravel; caving typically minor | Color: Yellow/Brown/Red Hardness: Soft to medium |
20 – 45 ft | SAND & GRAVEL with CLAY | Coarse sand and gravel, occasional clay interbeds; good aquifer, may have transitions from sand/gravel/clay to cleaner sand/gravel | Color: Gray/Brown Hardness: Medium |
45 – 60 ft | SAND & GRAVEL | Clean sand and gravel, main aquifer for residential supply | Color: Gray/Yellow Hardness: Loose to medium |
60 – 100 ft | HARDPAN or CLAY/GRAVEL INTERBEDS | Dense clay, hardpan, or repeated gravelly clay/gravel and occasional stony clay; in some wells, sand/gravel lenses persist | Color: Gray/Blue/Variegated Hardness: Hard/Dense |
100 – 120 ft | LIMESTONE or CONTINUING SAND/GRAVEL | In some wells, limestone bedrock is present from ~100+ ft, in others deep sand or gravel continues; may be water-bearing if fractured | Color: Gray Hardness: Hard (if rock) or loose/medium (if sand/gravel) |