48. It is prohibited to remove a sign or give access to treated premises as long as the concentration of fumigant in the premises has not stabilized below the following concentrations:(1) 0.3 ppm or 0.42 mg/m3 phosphine;
(2) 1.0 ppm or 3.9 mg/m3 methyl bromide;
(3) 0.1 ppm or 0.18 mg/m3 ehtylene oxide;
(4) 5,000 ppm or 9,000 mg/m3 carbon dioxide.
For other fumigants, it is prohibited to remove a sign or give access to treated premises for as long as the concentration of fumigant used in the premises has not stabilized below the concentration given on the label of the fumigant.