; composition (1) Chair The steering committee shall be chaired by the Assistant Administrator of the Office of Research and Development of the Environmental Protection Agency. (2) Composition The steering committee shall be composed of 15 members, all of whom shall be active, full-time employees of the Environmental Protection Agency, with at least one member representing each relevant program office and each regional office of the Environmental Protection Agency. The members of the steering committee shall be appointed by the Administrator of the Environmental Protection Agency. Any vacancy shall be filled in the same manner as the initial appointment. (d) Meetings The steering committee shall meet at least once each calendar year. (e) Third-Party assessment requirements The requirements specified in this subsection with respect to a third-party assessment of a chemical substance are that the assessment— (1) is conducted using scientific standards specified in section 7B; (2) has undergone independent scientific review for transparency, completeness, and quality