Land clearing, grubbing, snagging, and draining. Also includes earthmoving, grading, digging, cutting, filling, backfilling, compaction, trenching, excavation, and spreading of soil materials. Also includes the construction of ditches, canals, ponds, and levees. May involve the installation of ditch linings, erosion control, wing walls, culverts, drains, and catch basins. Also involves ground freezing and the use of piezometers, sumps, and any other apparatus used in the removal or isolation of ground water. In addition, may involve the installation of various geotextile products for separation of water or soils. Earthwork, drainage and levees is a subclassification of Highway, Street, and Bridge Construction.