; (ii) permit effective enforcement of the conservation purposes of the groundwater conservation easements, including— (I) a mechanism for the measurement of groundwater pumping reductions; and (II) the ability to enforce those reductions under relevant State law; (iii) except as provided in paragraph (2)(D)(ii), include a right of enforcement for the Secretary, which may be used only if the terms of the groundwater conservation easement are not enforced by the holder of the groundwater conservation easement; and (iv) subject the eligible water rights and eligible land, if applicable, in which an interest is purchased to a groundwater conservation easement plan that includes— (I) a description of the activities that demonstrate protection of soil resources and reduced groundwater use and meet any other conservation purposes for which the groundwater conservation easement was acquired; (II) a groundwater conservation plan, where appropriate, that includes, at the option of the Secretary, activities that will help maintain or enhance groundwater-dependent ecosystems; and (III) any other provisions that the Secretary determines to be necessary to accomplish the purposes of the groundwater conservation easement program. (D) Substitution of qualified projects An agreement under this paragraph shall allow, on mutual agreement of the parties, substitution of qualified projects that are identified at the time of the proposed substitution. (E) Effect of violation If a violation of a term or condition of an agreement under this paragraph occurs, the Secretary may— (i) terminate the agreement