(S (S (NP (BASENP (DT Some)) (PP (IN of) (BASENP (DT those) (NNS cracks)))) (VP (MD can) (VP (VB cause) (S (BASENP (NN oil)) (VP (TO to) (VP (VP (VP (VB leak) (PRT (RP through))) (PP (IN at) (NP (BASENP (DT a) (NN rate)) (NP (NP (QP (ADJP (ADJP (RB as) (JJ high)) (IN as)) (NN 5,000)) (NNS gallons)) (BASENP (DT a) (NN day)))))) (COMMA ,) (PP (IN with) (S (NP (BASENP (JJS most)) (PP (IN of) (BASENP (DT the) (NN oil)))) (VP (RB not) (VP (ADVP (RB even)) (VP (VBG reaching) (NP (BASENP (DT the) (NN water) (POS 's)) (NN surface))))))))))))) (PERIOD .))