(B) In an action under subparagraph (A) respecting a petition to initiate a proceeding to issue a rule under section
2603,
2605, or
2607 of this title or an order under section
2604 (e) or
2605 (b)(2) of this title, the petitioner shall be provided an opportunity to have such petition considered by the court in a de novo proceeding. If the petitioner demonstrates to the satisfaction of the court by a preponderance of the evidence that
(i) in the case of a petition to initiate a proceeding for the issuance of a rule under section
2603 of this title or an order under section
2604 (e) of this title
(I) information available to the Administrator is insufficient to permit a reasoned evaluation of the health and environmental effects of the chemical substance to be subject to such rule or order; and
(II) in the absence of such information, the substance may present an unreasonable risk to health or the environment, or the substance is or will be produced in substantial quantities and it enters or may reasonably be anticipated to enter the environment in substantial quantities or there is or may be significant or substantial human exposure to it; or
(ii) in the case of a petition to initiate a proceeding for the issuance of a rule under section
2605 or
2607 of this title or an order under section
2605 (b)(2) of this title, there is a reasonable basis to conclude that the issuance of such a rule or order is necessary to protect health or the environment against an unreasonable risk of injury to health or the environment.
the court shall order the Administrator to initiate the action requested by the petitioner. If the court finds that the extent of the risk to health or the environment alleged by the petitioner is less than the extent of risks to health or the environment with respect to which the Administrator is taking action under this chapter and there are insufficient resources available to the Administrator to take the action requested by the petitioner, the court may permit the Administrator to defer initiating the action requested by the petitioner until such time as the court prescribes.