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Does a Negligent Phase I Result in Loss of the CERCLA Innocent Purchaser Defense?

By David Mandelbaum on May 28, 2026
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Someone who buys contaminated real estate can sometimes avoid liability under the federal Comprehensive Environmental Response, Compensation and Liability Act (CERCLA or Superfund), 42 U.S.C. Sections 9601-75, if that purchaser conducts “all appropriate inquiry” before the purchase. If the inquiry does not uncover a reason to believe that the site is contaminated, then the purchaser may be “innocent.” See 42 U.S.C. Section 9601(35). If the inquiry does uncover contamination and the purchaser takes certain other steps, the buyer may be a “bona fide prospective purchaser.” See Section 9601(40). A “Phase I environmental site assessment” is the colloquial term for the inquiry that constitutes “all appropriate inquiry.” A similar defense exists under the Pennsylvania Hazardous Sites Cleanup Act, 35 Pa. Stat. Ann. Section 6020.701(b).

Read “Does a Negligent Phase I Result in Loss of the CERCLA Innocent Purchaser Defense?” authored by David G. Mandelbaum on The Legal Intelligencer website. (subscription)

Link to Click here to download the PDF. Click here to download the PDF.

*The opinions expressed in this column are those of the author and do not necessarily reflect the views of Greenberg Traurig or its clients.

Photo of David Mandelbaum David Mandelbaum

David G. Mandelbaum represents clients facing problems under environmental laws. He regularly represents clients in lawsuits and also has helped clients achieve satisfactory outcomes through regulatory negotiation or private transactions. A Fellow of the American College of Environmental Lawyers, David teaches Superfund, and…

David G. Mandelbaum represents clients facing problems under environmental laws. He regularly represents clients in lawsuits and also has helped clients achieve satisfactory outcomes through regulatory negotiation or private transactions. A Fellow of the American College of Environmental Lawyers, David teaches Superfund, and Oil and Gas Law in rotation at the Temple University Beasley School of Law as well as an environmental litigation course at Suffolk (Boston) Law School.

Since United States v. Atlas Minerals, the first multi-generator Superfund contribution case to go to trial in 1993, Mr. Mandelbaum has been engaged in matters involving allocation of costs among responsible parties, especially under the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA).  He has tried large cases and resolved others as lead counsel.  He has written, spoken, and taught extensively on the subject.  More recently he also has been engaged to assist lead counsel from this firm and others:

  • to develop cost allocation methodologies;
  • to craft expert testimony in support of a favored methodology (given a definition of “fairness,” why one methodology better tracks it than another);
  • to develop efficient case management approaches; and to assist private allocation as part of the neutral team.

Concentrations

  • Air, water and waste regulation
  • Superfund and contamination
  • Climate change
  • Oil and gas development
  • Water rights
Read more about David MandelbaumEmailDavid's Twitter Profile
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  • Posted in:
    Environmental and Climate
  • Blog:
    E2 Law Blog
  • Organization:
    Greenberg Traurig, LLP
  • Article: View Original Source

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