### Question
What is the definition of federally required commencement date?


### Answer
The definition of **federally required commencement date** is as follows in *42 U.S.C. § 9658*:

> the date the plaintiff knew (or reasonably should have known) that the personal injury or property damages referred to in subsection (a)(1) of this section were caused or contributed to by the hazardous substance or pollutant or contaminant concerned

#### Citation:
  - *42 U.S.C. § 9658*
  - Heading: **CHAPTER 103-COMPREHENSIVE ENVIRONMENTAL RESPONSE, COMPENSATION, AND LIABILITY > SUBCHAPTER III-MISCELLANEOUS PROVISIONS**

