No person will engage in the siting, layout, construction, reconstruction, alteration, modification, repair, closure, or otherwise changing of a private onsite wastewater system unless a Master Installer, a Journeyman Installer, a professional engineer, or a registered environmental health specialist who is responsible for such work is physically present at the site where such work is being performed and is supervising the work, except that a Soil Evaluator or an Inspector may perform soil evaluation for the purpose of aiding in siting and layout.
124 Neb. Admin. Code, ch. 9, § 004