15. The commission may confiscate and enforce the security if the permit holder does not comply with the terms of the permit. Where the commission enforces the security, it shall apply the sum so collected to the works required to restore the site for which the permit was granted to agricultural use, in a state comparable to its prior state.
Where the sum collected exceeds what is necessary for the purpose, the commission shall return the surplus to the permit holder or the surety, whichever is appropriate.