Fig. 4From: Clustering and prioritization to design a risk-based monitoring program in groundwater sources for drinking waterProvisional drinking water guideline values [27] compared to mean and 90th percentile concentrations found in drinking water and source water. Concentrations of chemicals without pGLVs are compared to of the TTC value of 0.1 µg/L (in grey). Black line represents a benchmark quotient of 1, while dotted line represents a benchmark quotient of 0.1Back to article page