; and (ii) require the eligible entity to refund all, or part of, any payments received by the eligible entity under the groundwater conservation easement program, with interest on the payments, as determined appropriate by the Secretary. (5) Certification of eligible entities (A) Certification process The Secretary shall establish a process under which the Secretary may— (i) directly certify eligible entities that meet established criteria; (ii) enter into long-term agreements with certified eligible entities; and (iii) accept proposals for cost-share assistance for the purchase of groundwater conservation easements throughout the duration of those agreements. (B) Certification criteria To be certified under subparagraph (A), an eligible entity shall demonstrate to the Secretary that the eligible entity will maintain, at a minimum, for the duration of the agreement— (i) a plan for administering groundwater conservation easements that is consistent with the purposes of the groundwater conservation easement program; (ii) the capacity and resources to monitor and enforce groundwater conservation easements; and (iii) policies and procedures to ensure— (I) the long-term integrity of groundwater conservation easements; (II) timely completion of acquisitions of groundwater conservation easements