The representative of the State in the département may give formal notice to the owner or, failing this, the operator of a built property:
1° To implement, within a fixed period, the necessary measures in the event of non-compliance with the obligations laid down in article L. 1334-12-1;
2° To have an expert assessment carried out, within a time limit set by the operator, to determine the necessary measures or to check that the measures implemented or planned under these obligations are appropriate.