oa Quantitative mapping of waste coal tar deposits by EM conductivity and VLF-resistivity surveys

The nature of coal tar deposits presents considerable difficulties for traditional site investigation metliods such as boreholes and cone penelrometer tests. These intrusive methods normally require access by heavy vehicles and would be at risk on a tar surface. However, the low viscosity of tar (in winter) means site characterisation may be undertaken by a geophysicist using lightweight instrumentation.