In addition, experience with contamination remediation over the last 20 years has shown that the measures taken have in most cases not been able to completely remove all contaminants and that pollutant sources, even if partially removed, continue to release pollutants for a long period of time (i.e. several generations).
Ina theannta sin, taispeánadh sa taithí ar leigheasachán éillithe thar na 20 bliain seo caite nár éirigh sna bearta a glacadh fáil réidh le gach ábhar salaithe sa chuid is mó de chásanna agus go leanann foinsí truailleán orthu, fiú má fhaightear réidh leo i bpáirt, ag scaoileadh truailleán ar feadh tréimhse fada ama (i. ar feadh na nglún).