Septic tank installation in solid rock, for a 500 gallon-per-day aerobic septic system.
 Solid rock septic tank excavation, leveled and sanded.
 Rock-saw trenching for the sewer and electrical lines for the 500 gpd aerobic septic system.
 Placing the aerobic septic tank.
[4-5-6] The tank laid in the excavation and linked to the overall system.
 Back-filling the septic tank excavation.