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Results of purposeful groundwater monitoring and modelling studies are presented, which were carried out in order to better understand groundwater flow patterns from the "Vector" site for near-surface radioactive waste disposal and storage in the Chornobyl exclusion zone towards river network. Both data of observations at local-scale monitoring well network at "Vector" site carried out in 2015 -2016 and modelling analyses using the regional groundwater flow model of Chornobyl exclusion zone suggest that the groundwater discharge contour for water originating from "Vector" site is Sakhan River, which is the tributary to Pripyat River. The respective groundwater travel time is estimated at 210 -340 years. The travel times in subsurface for 90 Sr, 137 Cs, and transuranium radionuclides (Pu isotopes, 241 Am) are estimated respectively at thousands, tenths of thousands, hundreds of thousandsmillion of years. These results, as well as presented data of analyses of lithological properties of the geological deposits of the unsaturated zone at "Vector" site, provide evidence for good protection of surface water resources from radioactivity sources (e.g., radioactive wastes) to be disposed in the near-surface facilities at "Vector" site.

Водоносний горизонт: ал -алювіальні відклади; т -техногенні відклади; кр -кристалічний фундамент. ** ДСанПин 224-171-10 (із змінами, внесеними згідно з Наказом Міністерства охорони здоров'я № 505 (z1043-11) * Aquifer: ал -alluvial deposits; т -technogenic deposits; кр -crystalline basement. ** DSanPin 224-171-10 (with changes according to the Order № 505 (z1043-11) of the Ministry of Health of Ukraine