2221 Removing vegetation (0) Removing and disposing of vegetation on site 2222 Grubbing out roots (0) Removing tree roots using mechanical grinding and cutting tools 2223 Removing subsurface constructions (0) Excavating, removing and disposing of toxic, hazardous and/or contaminated materials occurring below general surface level including any necessary encapsulation and sealing 2224 Site dewatering (0) Temporarily lowering the ground water level over the whole or parts of the site to facilitate construction, the work being executed by a specialist firm or by the General Contractor