N.J. Stat. § 58:10A-30
The department shall have the authority to enter, at reasonable hours, any property or place of business where underground storage tanks or nonoperational storage tanks are or may be located to inspect any underground storage tank or nonoperational storage tank, and to photograph any records related to the operation of an underground storage tank or a nonoperational storage tank; to obtain samples or evidence of a discharge from any underground storage tank or nonoperational storage tank, or from the surrounding air, soil, or surface or groundwater; and to conduct monitoring or testing of any underground storage tank or nonoperational storage tank or the surrounding air, soil or surface or groundwater. The owner or operator of a facility or a nonoperational storage tank shall allow and cooperate with any action taken by the department pursuant to the provisions of this section.
N.J.S. § 58:10A-30