; and (ii) upon the request of the owner or operator of a covered chemical facility— (I) the number of individuals at risk of death, injury, or severe adverse effects to human health as a result of a worst case chemical facility terrorist incident at the covered chemical facility; (II) information relating to why the covered chemical facility is considered critical; and (III) the proximity or interrelationship of the covered chemical facility to other critical infrastructure. (d) Requirement for review The Secretary— (1) shall periodically review— (A) the designation of a chemical substance as a substance of concern and the threshold quantity for the substance under subsection (a)(1); and (B) whether a chemical facility meets the criteria under subsection (b)(1); and (2) may, at any time, determine whether a chemical facility is a covered chemical facility or change the tier to which the covered chemical facility is assigned under subsection (c)(1). (e) Provision of threat-Related information The Secretary shall provide to the owner or operator or security officer of a covered chemical facility threat information relating to probable threats to the covered chemical facility and methods that could be used in a chemical facility terrorist incident in order to assist the owner or operator in effectively assessing the vulnerabilities to the covered chemical facility. 2203. Security vulnerability assessments and site security plans (a) In general (1) Requirement The Secretary shall— (A) establish standards, protocols, and procedures for security vulnerability assessments and site security plans required for covered chemical facilities under this paragraph; (B) require the owner or operator of each covered chemical facility to— (i) conduct and submit to the Secretary an assessment of the vulnerability of the covered chemical facility to a range of chemical facility terrorist incidents, including an incident that results in a worst-case release of a substance of concern