Sand Mound Systems:
Contains at least 1 septic tank with its own manhole lid, about 24 inches in diameter. In addition, there is a lid at ground level, usually 36 inches in diameter, which is the lid for the pump tank. Oftentimes, sand mound systems have an initial dual compartment septic tank. For this type of system, the 3 separate manhole lids must be exposed in order to pump your system.