Section 6615a - Diligent and appropriate investigation for hazardous materials(a) Except as provided for in subsection (b) of this section, a diligent and appropriate investigation, as that term is used in subsection 6615(e) of this title, means, for all properties, an investigation where an owner or operator of a property conforms to the standard developed by the Secretary by rule for a diligent and appropriate investigation. If no standard exists, the owner or operator of a property shall conform to one of the following:(1) the all appropriate inquiry standard set forth in 40 C.F.R. Part 312, as amended; or(2) the current standard for phase I environmental site assessments established by the American Society for Testing and Materials.(b) In the case of residential property used for residential purposes, diligent and appropriate investigation shall mean a facility inspection and title search that:(1) reveal no basis for further investigation; and(2) do not reveal that the property was used for or was part of a larger parcel that was used for commercial or industrial purposes.Added 2013 , No. 55, § 13.