The first step is to identify which contaminant cascades for each sink should be assigned. The purpose of this step is also to determine the most likely source prioritisation sequence for each sink. This is performed by determining the ratio of shifted sink concentration to the shifted maximum of source concentration (Z*k,sk/C*k,sr_max) for each contaminant ’k’. Table 3 presents the results, and it shows that SK1 and SK3 should be in contaminant cascade ’A’, while SK2 and SK4 should be in contaminant ’B’ cascade, based on the smallest value of the ratio.
Table 3: Identification of source prioritisation sequence/contaminant cascade of each sinks for Case study 1 scenario 1