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Es ti mat ing ground wa ter vul ner a bil ity to pol lu tion is based on the quan ti ta tive and qual i ta tive as sess ment of the de gree of expo sure to the pol lu tion. This ar ti cle at tempts to as sess ground wa ter vul ner a bil ity to pol lu tion in the area of a com plex of landfill sites lo cated in the sup ply area of one of the im por tant ground wa ter res er voirs in south ern Po land. Two dy namic leach ing tests and two static tests were car ried out on two dif fer ent sam ples of slag from one of the met al lur gi cal land fills dur ing var ious pe ri ods of stor age (15 year old waste and freshly de pos ited waste). Trans port equa tions were based on the data from a col umn ex per i ment. The advection-dis per sion equa tion for col umn leach ing was em ployed, which con firmed the sim u la tion pa ram e ters through ex per i men ta tion. The re sults of the leach ing tests on chlo rides showed that they are leached from the land fill over a pe riod of ~60-90 years from the mo ment of de pos it ing the waste. The seep age time for the Qua ter nary aqui fer is 1-7 years and, for the Tri as sic aqui fer, 5-40 years. The Backman's con tam i na tion in dex (1998) val ues ex ceeded 25, while a high threat to ground wa ter is ob served when the con tam i na tion in dex value equals 3. The use of all the afore men tioned meth ods de ter mined the most vul ner a ble area. Key words: vul ner a bil ity, leach ing tests, con tam i na tion in dex, land fills.

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