Installation, maintenance, and repair of alarm systems and surveillance systems; contractor services, namely, review of and remedial recommendations for building plumbing, electrical and mechanical systems for others; hazardous waste clean-up services; janitorial services; general building contractor services; building construction and demolition services; carpentry services; construction, facility maintenance and repair, restoration, and renovation of buildings and real property; installation of utilities, electrical systems and HVACs in construction sites; installation of sewers, pipelines, water systems, wastewater systems; construction consultation; construction management and planning; repair and maintenance of vehicles, machinery, and construction equipment; construction project management services; excavation services; horizontal construction services; construction, repair, and installation of bridges, utilities, sewers, pipelines, wastewater systems, containment systems, roads, airports, and civil engineering structures