Detection And Mapping Of An Lnapl Plume Using Gpr: A Case Study

Ground penetrating radar was used to delineate a gasoline (LNAPL) plume at the site of a<br>former gasoline station. Monitoring wells indicated the approximate location of the plume<br>and a free product thickness of up to 1.7 m above a water table typically 3-4 m below ground<br>surface. Anomalous GPR responses were detected well above the expected depth of mobile<br>LNAPL. The shallow depths of anomalous responses indicates that a residual or possibly<br>vapour contaminant found in the non-saturated zone produces the characteristic GPR<br>anomaly detected during this survey.