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HRS Guidance Manual, Section 6.5, Subsection D1

D1.   Locating Data

The following may provide accounts of the areas of sources containing hazardous substances:

  • PRP data
  • State data
  • Property records
  • EPA signed and finalized compliance orders
  • Permits
  • Aerial photographs

To calculate the area of the source, all of the following must be true:


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