The unit will be installed outside the building and placed perfectly level. He will be buried outside a vehicle crossing.
Its lid will reach the ground level and will remain easily accessible for maintenance. The bottom of the excavation will be perfectly flat and covered with 10 cm of sand. The embankment will be made with sand, and in no case with stone or gravel.
The apparatus will be filled with pozzolan or other filtering materials of regular granulation between 40 and 50 mm. This operation will be done before or at the same time as the backfilling.
In the case where the cover can not reach the ground level, the apparatus will have to receive a slab of concrete, being supported on the edges of the excavation; this slab will be calculated to withstand the imposed constraints.
In case of passing vehicles regardless of the device, it must receive a concrete slab.
All these models can be equipped with polyethylene extensions.
In case of presence of water table, consult our Design Office.