| Value | Category | Cases | |
|---|---|---|---|
| 1 | CEMENT / CONCRETE | 7 |
2.6%
|
| 2 | ASPHALT | 135 |
50%
|
| 3 | GRAVEL | 80 |
29.6%
|
| 4 | ALL ARE EARTH | 48 |
17.8%
|