( ( At ( some sites ) ) ( they ( ( expect ( it ( to ( ( ( take ( up ( to ( several decades ) ) ) ) ( or more ) ) ( to ( be ( able ( ( ( ( to ( ( ( ( clean up ) and ) ( then ( at least ) ) ) ( control ( where ( ( the contamination ) ( is moving ) ) ) ) ) ) and ) then ) ( to ( minimise ( ( ( ( any potential ) ( for ( ( people 's ) ( ground water ) ) ) ) and ) ( drinking ( supplies ( to ( be contaminated ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN At) (NP (DT some) (NNS sites))) (NP (PRP they)) (VP (VBP expect) (S (NP (PRP it)) (VP (TO to) (VP (VB take) (ADVP (RB up) (PP (TO to) (NP (JJ several) (NNS decades)))) (NP (QP (CC or) (JJR more))) (S (VP (TO to) (VP (VB be) (ADJP (JJ able) (S (VP (VP (TO to) (VP (VP (VB clean) (PRT (RP up))) (CC and) (PRN (ADVP (RB then)) (ADVP (IN at) (JJS least))) (VP (VB control) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN contamination)) (VP (VBZ is) (VP (VBG moving)))))))) (CC and) (ADVP (RB then)) (VP (TO to) (VP (VB minimise) (NP (NP (NP (DT any) (NN potential)) (PP (IN for) (NP (NP (NNS people) (POS 's)) (NN ground) (NN water)))) (CC and) (NP (NN drinking) (NNS supplies) (S (VP (TO to) (VP (VB be) (VP (VBN contaminated))))))))))))))))))) (. .)))
At some sites they expect it to take up to several decades or more to be able to clean up and then at least control where the contamination is moving and then to minimise any potential for people's ground water and drinking supplies to be contaminated.
(ROOT (S (NP (NP (QP (IN At) (JJS least) (CD 20)) (NN percent)) (PP (IN of) (NP (NP (DT the) (NN world) (POS 's)) (NNS people)))) (VP (VBP do) (RB not) (VP (VB have) (NP (NP (DT a) (JJ ready) (NN supply)) (PP (IN of) (NP (JJ clean) (NN drinking) (NN water)))))) (. .)))