Site conditions requiring extra precautions for induced polarisation measurements

In a precedent paper we compared sections acquired either with separated multicore cables and non-polarisable potential electrodes or with only one multicore cable and current and potential electrodes both in stainless steel. From the results obtained at two sites in Southern Sweden, we could conclude that it was possible to obtain good quality time-domain induced polarisation data with the simplified logistics. Consequently, we have applied the method to other sites, and could occasionally verify that it was justified. But in some cases, when the grounding resistances were very high, the quality of the induced polarisation data was very poor.