Commercial building construction; Construction grading services; Construction of airports; Construction of civil engineering structures; Construction of civil engineering structures by forming concrete; Construction of civil engineering structures by laying concrete; Construction of civil engineering structures by pouring concrete; Construction of civil engineering structures using concrete; Construction of roads, underground utilities, and housing pads; Construction of wind power plants; Construction services, namely, concrete paving, site clearing, excavation, pad preparation, grading, and asphalt paving services; Construction services, namely, installation of environmental containment systems; Consulting services in the field of construction of wind energy facilities; Factory construction; General construction contracting; Hydro-electric factory construction; Hydroelectric factory construction; Laying and construction of pipelines; Pipeline construction; Road construction