Which of the following disposal components can be installed by an Installer I?

The correct choice is leaching chambers, as these are considered to be a standard component in on-site sewage facility systems and fall within the scope of work for an Installer I. An Installer I is typically authorized to work on conventional systems, which includes the installation of leaching chambers that are utilized for dispersing effluent into the soil.

Leaching chambers are designed to allow treated wastewater to infiltrate into the surrounding soil, aiding in final treatment and dispersal. This component is essential for systems that rely on soil absorption techniques.

In contrast, advanced treatment systems may involve more complex procedures and require higher levels of training and certification beyond that of an Installer I. Composting toilets also have specific guidelines and installation requirements that often necessitate additional expertise. Likewise, wastewater treatment plants are large-scale systems requiring specialized professional qualifications that exceed the Installer I responsibilities.