The scope of the "Ground Improvement” service is improvement or strengthening of site inadequacies of an engineering nature by means of borehole grouting and other methods. Ground improvement includes rock and soil layers. The field of work includes mountain tunnels,rock caverns,rock dam foundations and all methods of rock improvement. Also included are underground pipelines and auxiliary grouting of Metro tunnels in the metropolitan plains. In general, engineering methods to reduce water permeability and to increase site solidity are the main concentration.