The customer asked us to take a look at the concrete mass because it had broken and the soil was starting to sink. When we opened the lid of the concrete mass to check, we found that the concrete had cracked and water was flowing out. If it continues like this, the soil will wash away every time the water flows out, causing the sinking to get worse. We recommended replacing it with a new mass. We removed the existing concrete mass and replaced it with a new plastic mass. We drilled holes in the mass and connected the pipes.