For the same reasons we also uncover the first distribution box in the system - if it has one and it can be found. While the system is uncovered we introduce a dye into the tank and then perform a functional flow test by flowing several hundred gallons of water through the system. We actually watch the system work, and can see how well the leaching field absorbs water, and how flow is being distributed to the various parts of the leaching field. If the leaching field has problems and the system starts to back up we immediately stop the test before any additional damage can occur . If further analysis is necessary we will make several test holes in the leaching field to determine below grade water levels and the condition of the trenches.
All excavation is done by hand, so there is no heavy equipment to damage the lawn.
Sod is carefully removed and placed on canvas along with dirt from the holes. When we are finished the sod is carefully replaced, tamped into place, and the lawn raked.