Includes facilities that carry out the SUCTION groundwater using equipment and pumps for drying construction sites before the initiation of the work of pouring concrete foundations for the construction of buildings and civil constructions, sub-contracts with the contractor include specialized enterprises in the work of the settlement sites include all or some of the work, the removal of all obstacles that may appear on site or any old foundations or other obstacles others reach the required depth of the settlement phenomenon, according to the project's main graphics either contracting companies engaged in this work itself is considered this activity is part of its work.