Building renovation and restoration services; Building construction for security infrastructure projects and for monitoring infrastructure projects; Land port and border development services, namely, construction of structures for security and force protection; Installation of scanning and security systems; Construction and maintenance of buildings; Construction of civil engineering structures; Construction and maintenance of military family housing and temporary employee housing; Construction of water treatment plants, piping, and utility infrastructure; Installation of process control equipment for water treatment plants; Construction services, namely, installation of environmental remediation systems; Construction management and supervision; Construction dewatering, namely, the removal of surface waters and groundwater to facilitate the construction of structures, infrastructures, and environmental remediation; Construction services, namely, concrete paving, site clearing, excavation, grading, pad preparation, grading, and asphalt paving services; Hazardous waste clean-up services; Long term operation and maintenance of remediation systems, namely, landfill caps, vegetation, water treatment systems, and ground water monitoring systems; Excavating of contaminated soil; Soil erosion control services; Building and facility demolition services

Environmental remediation services, namely, excavation and treatment of soil, waste, and water; Environmental remediation services being treatment of polluted ground waters; Environmental earth work services being closing, capping, and grading of landfills; Environmental remediation services, namely, restoration of abandoned mine sites, mine shafts, and subsidence pits