Hunan Contaminated Site Vertical Barrier Inspection
Background
On the western bank of the Xiang River, this ~17-hectare site is a representative heavy-metal remediation project. To control chromate migration, a closed HDPE flexible vertical cut-off barrier was built around the contaminated zone (1,581.2 m) and the chromium-slag area (667.0 m).
Challenge
Construction quality of a deep flexible vertical barrier directly determines downstream groundwater safety, requiring full-cycle inspection of embedment depth, lap-seam integrity, overall continuity and surface defects — plus ongoing validation in operation.
Solution
Custom probes verified embedment depth; dual-electrode tests confirmed lap-seam sealing for single panels; post-backfill dual-electrode surveys verified overall continuity; pre-installation arc-method scanned for pinholes and scratches. Periodic resistivity surveys outside the barrier track containment in service.
Results
Surface defects and shortfalls in embedment depth identified and repaired
Full-cycle QA secured construction quality of the cut-off system
Post-commissioning resistivity monitoring shows no contaminant migration
Provides a transferable technical pathway for non-ferrous metallurgical remediation projects
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