good cause
(2) Operator assistance in investigations.— (A) In general .— The Secretary may impose a civil penalty under section 60122 on a person who obstructs or prevents the Secretary from carrying out inspections or investigations under this chapter. (B) Obstructs defined.— (i) In general .— In this paragraph, the term “obstructs” includes actions that were known, or reasonably should have been known, to prevent, hinder, or impede an investigation without good cause. (ii) Good cause .— In clause (i), the term “good cause” may include actions such as restricting access to facilities that are not secure or safe for nonpipeline personnel or visitors.