True or False: Dosing tank manholes should be placed within 12 inches of the surface grade.

Dosing tank manholes should indeed be placed at a depth that allows for effective maintenance and operation. The standard practice is to have manholes accessible and convenient for cleaning and inspections, which typically means they should be closer to the surface grade than 12 inches.

If manholes are set deeper than this standard, they may become less accessible, complicating routine maintenance tasks. Additionally, having them too deep can lead to problems with access in case of an emergency or necessary repairs.

In summary, the placement of dosing tank manholes at a depth greater than 12 inches from the surface is not compliant with standard accessibility recommendations, hence the statement can be considered false. Accessibility and maintenance are essential for efficient septic system functioning, reinforcing the need for proper placement of manholes.