Estimated nominal geotechnical resistance
| Soil stratum | Soil description | Stratum thickness: feet (m) | Average SPT N value: blows/foot or blows/305 mm | Estimated unit nominal resistance for friction pile: kips/foot (kN/m) | |
|---|---|---|---|---|---|
| 1 | Soft silty clay | 6 (1·8) | 4 | 0·8 (11·7) | |
| 2 | Silty sand | 9 (2·7) | 6 | 1·2 (17·5) | |
| 3A | Firm glacial clay | Within 30 feet (9·1 m) of natural ground elevation | 8 (2·4) | 11 | 2·8 (40·9) |
| 3B | More than 30 feet (9·1 m) below natural ground elevation | 65 (19·8) | 12 | 3·2 (46·7) | |
| Soil stratum | Soil description | Stratum thickness: feet (m) | Average SPT | Estimated unit nominal resistance for friction pile: kips/foot (kN/m) | |
|---|---|---|---|---|---|
| 1 | Soft silty clay | 6 (1·8) | 4 | 0·8 (11·7) | |
| 2 | Silty sand | 9 (2·7) | 6 | 1·2 (17·5) | |
| 3A | Firm glacial clay | Within 30 feet (9·1 m) of natural ground elevation | 8 (2·4) | 11 | 2·8 (40·9) |
| 3B | More than 30 feet (9·1 m) below natural ground elevation | 65 (19·8) | 12 | 3·2 (46·7) | |
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