; and (B) make a determination about how best to represent the human health risk posed by the chemical substance involved. (d) Chemical assessment database (1) In general A toxicity value or values assigned to a chemical substance under subsection (c) shall be included in a chemical assessment database to be maintained by the Office of Research and Development of the Environmental Protection Agency. (2) Completed assessments All covered assessments stored, as of the date of the enactment of this Act, in the IRIS database of the Environmental Protection Agency shall be retained in the chemical assessment database established pursuant to paragraph (1). (3) Updates Such database shall be updated pursuant to a covered assessment performed by a relevant program office, including to make a change in the existing toxicity value or values for a chemical substance included in such database. (e) Certification Beginning 2 years after the date of the enactment of the Improving Science in Chemical Assessments Act and every 2 years thereafter, the Office of Research and Development of the Environmental Protection Agency shall submit to the Committee on Science, Space, and Technology and the Committee on Energy and Commerce of the House of Representatives and the Committee on Environment and Public Works of the Senate a report containing a certification that each covered assessment completed during the period covered by the report was conducted using the scientific standards specified in section 7B. (f) Definitions In this section, section 7A, and section 7B: (1) Covered assessment The term covered assessment means, with respect to the evaluation of the human health effects resulting from chronic exposure to a chemical substance, a chemical hazard identification and dose-response assessment (as such terms are defined by the Environmental Protection Agency on the day before the date of the enactment of this section). (2) Relevant program office The term relevant program office includes the following offices of the Environmental