N.H. Rev. Stat. § 149-I:3
Any city which shall have received an order by the department of environmental services under the provisions of RSA 147, 485, or 485-A shall proceed forthwith to acquire whatever easements and lands as are necessary to comply with said order and may enter upon, for the purpose of survey leading to land description, any land of any person. In so proceeding the mayor and aldermen shall institute any necessary land taking in accordance with the provisions of RSA 149-:2I and, anything contained in RSA 231 or in the statutes generally notwithstanding, the decision of the mayor and aldermen shall not be vacated and any subsequent appeal or other action by the owner or owners shall be based solely on the amount of damages assessed, and the mayor and aldermen or their duly appointed agents shall have full right of immediate entry for the purpose of detailed surveys, borings, or the conduct of any and all other actions necessary or desirable to aid the city in the implementation of the order by the department of environmental services.
RSA 149-I:3
RSA 252:5-a. 1969, 377:4. 1981, 87:2. 1986, 202:6, I(a). 1989, 339:19. 1996, 228:108, eff. July 1, 1996.