industrial contracting in the area of process piping installation services; rigging and precision millwright, namely, installing, relocating and/or removal of process equipment, conveying systems and machinery, and precision alignment and levelling of equipment, motors, shafts and pumps, and concrete work for machine footings and slab; electrical services; maintenance of plant instrumentation and controls; material handling equipment installation; construction management services and construction in the area of industrial concrete work, office upfit, laboratory upfit, demolition, renovation, [ site clearing, ] footings and foundations, steel erection, and building construction for industrial facilities; and [ erection pre-engineered metal buildings; and ] plant maintenance and shutdown services pertaining to industrial plants and facilities and the electrical, mechanical, plumbing and HVAC systems of such plants and facilities as well as plant and process equipment