(3) Limitation per residence The cumulative amount of the credit allowed under subsection (a) for an eligible dwelling unit for all taxable years shall not exceed $4,000. (c) Definitions and special rules For purposes of this section: (1) Lead hazard reduction activity cost (A) In general The term lead hazard reduction activity cost means, with respect to any eligible dwelling unit— (i) the cost for a certified risk assessor to conduct an assessment to determine the presence of a lead-based hazard (as such terms are defined by the Secretary, in consultation with the Administrator of the Environmental Protection Agency), (ii) the cost for performing lead abatement measures by a certified lead abatement supervisor (as such term is defined by the Secretary, in consultation with the Administrator of the Environmental Protection Agency), including the removal of paint, dust, or pipes, the permanent enclosure or encapsulation of lead-based paint or pipes, the replacement of painted surfaces, windows, or fixtures, or the removal or permanent covering of soil when lead-based hazards are present, (iii) the cost for performing interim lead control measures to reduce exposure or likely exposure to lead-based hazards, including specialized cleaning, repairs, maintenance, painting, temporary containment, ongoing monitoring of lead-based hazards, and the establishment and operation of management and resident education programs, but only if such measures are evaluated and completed by a certified lead abatement supervisor using accepted methods, are conducted by a qualified contractor, and have an expected useful life of more than 10 years, (iv) the cost for a certified lead abatement supervisor, those working under the supervision of such supervisor, or a qualified contractor to perform all preparation, cleanup, disposal, and clearance testing activities associated with the lead abatement measures or interim lead control measures, and (v) costs incurred by or on behalf of any occupant of such dwelling unit for any relocation