Examples of an agent of a Professional Engineer

Except as provided in 40 CFR §112.6 for qualified facilities, a Professional Engineer (PE) or an agent of the PE must visit and examine the facility before the PE certifies an SPCC Plan (40 CFR §112.3(d)).  What are some examples of an agent of a PE?

An agent of a PE might include an engineering technician, technologist, graduate engineer, or other qualified person to prepare preliminary reports, studies, and evaluations after visiting the site.  If an agent performs the site visit, it must be consistent with good engineering practice.  Regardless of whether the PE or an agent performs the site visit, the PE must ensure that his certification represents an exercise of good engineering judgment.  If that requires a personal site visit, the PE must visit the facility himself before certifying the Plan.