(a) The executive director or the person in its sole discretion may terminate the agreement by giving 15 days' advance written notice to the other. Only those costs incurred or obligated by the executive director before notice of termination of the agreement are recoverable under the agreement if the agreement is terminated.
(b) Termination of the agreement does not affect any right the executive director has under other law to recover costs.
(c) If the person does not pay to the commission the state's costs associated with the voluntary cleanup before the 31st day after the date the person receives notice that the costs are due and owing, the attorney general, at the request of the executive director, shall bring an action in the name of the state in Travis County to recover the amount owed and reasonable legal expenses, including attorney's fees, witness costs, court costs, and deposition costs.