Whenever the current cost estimate increases to an amount greater than the amount being provided in the financial assurance mechanism(s), the owner or operator must either cause the amount of the financial assurance to be increased and submit evidence of such increase to the executive director, or obtain additional financial assurance in accordance with this chapter to cover the increase. This adjustment must be made within 60 days after the owner or operator becomes aware, or is notified by the executive director, of the increase.
30 Tex. Admin. Code § 37.141