Table 1.
Scheme of GPR and ultrasonic testing (UT) investigations.
| Surveys | GPR Traces | UT Traces |
|---|---|---|
| A | A-1 to A-147 | A-121 and A-129 |
| B | B-1 to B-150 | − |
| C | C-1 to C-4 | C-1 to C-4 |
| D | D-1 to D-4 | D-1 to D-4 |
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