N.H. Code Admin. R. Env-Or 302.24
“Impermeable” means a characteristic of a material that prevents oil from moving through the material from one side to the other.
Source. (See Revision Note at chapter heading for Env-Or 300) #10487, eff 2-7-14; ss by #14094, eff 10-4-24 (formerly Env-Or 302.22)