"Substantial modification" means the construction or installation of any addition to a facility or any restoration or renovation of a facility that increases or decreases the on-site storage capacity of the facility, significantly alters the physical configuration of the facility, or impairs or improves the physical integrity of the facility or its monitoring systems. The term does not include on-site abandonment of a facility.
N.H. Admin. Code § Env-Or 302.52
(See Revision Note at chapter heading for Env-Or 300) #10487, eff 2-7-14