; 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; and (III) timely and complete evaluation and reporting to the Secretary with respect to the use of funds provided under the groundwater conservation easement program. (C) Review and revision (i) Review The Secretary shall conduct a review of eligible entities certified under subparagraph (A) not less frequently than once every 3 years to ensure that the eligible entities are meeting the criteria established under subparagraph (B). (ii) Revocation If the Secretary finds that a certified eligible entity no longer meets the criteria established under subparagraph (B), the Secretary may— (I) allow the certified eligible entity a specified period of time, but not less than 180 days, during which to take such actions as may be necessary to meet the criteria; and (II) revoke the certification of the eligible entity, if, after that specified period of time, the certified eligible entity does not meet the criteria. (f) Geographic scope The Secretary may only enroll eligible water rights or eligible land under this section in regions— (1) experiencing significant groundwater depletion, as determined by the Secretary consistent with data of the United States Geological Survey; and (2) where groundwater monitoring and permitting exists through the State, a local government, or a groundwater management district. (g) Method of enrollment The Secretary shall enroll eligible water rights and eligible land under this section through the use of— (1) permanent easements; or (2) easements for the maximum duration allowed under applicable State laws. (h) Technical assistance The Secretary may provide technical assistance, if requested, to assist in— (1) compliance with the terms and conditions of groundwater conservation easements