| Bridge supports | Layer depth (m) | Nature |
| C1 | 0 - 3.70 | firm brown clay with little plastic |
| 3.70 - 6.20 | loose beige sand very silty | |
| 6.20 - 9.00 | firm brown clay, very plastic | |
| 9.00 - 19.80 | firm reddish clay, very plastic | |
| 19.80 - 30 | fine beige medium compact sand | |
| P2 | 0 - 2.50 | soft brown clay very plastic |
| 2.50 - 5.50 | loose beige silty sand | |
| 5.50 - 8.30 | firm brown clay, very plastic | |
| 8.30 - 18.70 | very firm reddish clay very plastic | |
| 18.70 - 30 | beige sand very silty medium compact to compact | |
| P3 | 0 - 4.50 | brown clay fill |
| 4.50 - 6.50 | loose beige sand very silty | |
| 6.50 - 10.50 | firm brown clay, very plastic | |
| 10.50 - 18.40 | firm reddish clay, very plastic | |
| 18.40 - 30 | fine beige medium compact sand | |
| P4 | 0 - 3.50 | brown clay fill |
| 3.50 - 4.90 | soft brown silt | |
| 4.90 - 6.50 | beige sand very silty medium compact | |
| 6.50 - 13.5 | firm brown clay with little plastic | |
| 13.5 - 16.5 | firm reddish clay with little plasticity | |
| 16.5 - 30 | fine beige medium compact sand | |
| P5 | 0 - 1.90 | brown clay fill |
| 1.90 - 2.50 | firm brown silt | |
| 2.50 - 8.00 | soft brown clay very plastic | |
| 8.00 - 18.50 | firm reddish clay, very plastic | |
| 18.5 - 30 | beige sand very silty medium compact to compact | |
| C6 | 0 - 7.70 | firm brown clay with little plastic |
| 7.70 - 16.8 | firm reddish clay with little plasticity | |
| 16.8 - 30 | beige sand very silty medium compact |