*Hydrogeology Site Characterisation*

The first part of this section presents the principles and applications of ground penetrating radar (GPR) as a promising technology to detect and delineate aquifers or non-metallic minerals. Due to the inherent heterogeneity and isotropic nature of the subsurface, the need to improve approaches for groundwater detection and delineation remains vital.

In the second part, a case study on the hydrogeology characterisation of the Andean mountain groundwater resources of Central Chile is presented. Field surveys, streamflow gauging, environmental tracers, and a hydrological model are utilized as complementary techniques to improve site understanding.

Methods for predicting the risk of groundwater contamination with pesticides and their dangerous aspects for human health are then developed. These methods comprise risk acceptance assessment and integral groundwater contamination hazard index (IGCHI) evaluation according to a special scale.
