83. The authorization holder must, as soon as the work starts and until the site restoration work is undertaken, install a sign at the entrance of the activity site indicating, in particular,(1) the location of the stratigraphic survey;
(2) the holder’s name and the licence number;
(3) the name and number of the stratigraphic survey appearing on the authorization;
(4) a telephone number in case of emergency;
(5) the pictograms associated with the hazardous products present on the activity site; and
(6) the indication that access to the activity site is prohibited without the holder’s authorization.