leakage, intrusion, capture of harmful substances into groundwater

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Senior Member

Please advise, which word fits best in the underlined parts below? I prefer leakage but I have come across in this context with similar words of slightly different meanings - intrusion and capture.



In 2011, within the operational monitoring in the territory of Slovakia, 185 objects were watched (except for the territory of the Rye Island) in case of which the leakage of possible pollution into groundwater from a potential pollution source or their group is assumed. The sampling frequency was 1-4 times a year depending on the rock environment.

In case that monitoring of the effect of harmful substances and extremely harmful substances on groundwater detect leakage which causes endangering of waters, it is necessary to reassess the scope of pollution, to regularly monitor the concentration of the polluting substance in groundwater and to prepare a risk analysis.
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