"Contamination" means the presence of any regulated contaminant, as defined herein, other than naturally occurring substances at naturally occurring or background levels, in soil, groundwater, soil gas, air, sediment, surface water, construction/excavation debris, or any other material at a concentration that has the potential to adversely affect human health or the environment.
N.H. Admin. Code § Env-Or 602.07
(See Revision Note at chapter heading for Env-Or 600) #8812, eff 2-1-07