[Code of Federal Regulations]
[Title 40, Volume 27]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR312.24]

[Page 402]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 312_INNOCENT LANDOWNERS, STANDARDS FOR CONDUCTING ALL APPROPRIATE 
 
                    Subpart C_Standards and Practices
 
Sec.  312.24  Reviews of historical sources of information.

    (a) Historical documents and records must be reviewed for the 
purposes of achieving the objectives and performance factors of Sec.  
312.20(e) and (f). Historical documents and records may include, but are 
not limited to, aerial photographs, fire insurance maps, building 
department records, chain of title documents, and land use records.
    (b) Historical documents and records reviewed must cover a period of 
time as far back in the history of the subject property as it can be 
shown that the property contained structures or from the time the 
property was first used for residential, agricultural, commercial, 
industrial, or governmental purposes. For the purpose of achieving the 
objectives and performance factors of Sec.  312.20(e) and (f), the 
environmental professional may exercise professional judgment in context 
of the facts available at the time of the inquiry as to how far back in 
time it is necessary to search historical records.