121. If the water level allows, the authorization holder must, as soon as the work starts and until the holder begins the work for the permanent closure of the well and the restoration of the site, install a sign near the activity site, indicating, in particular,(1) the location of the well;
(2) the holder’s name and the licence number;
(3) the name and number of the well;
(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.