Engineers replace heaters, lights, switches, motors, relays, contactors, motor starters, capacitors, ballasts, timers, breakers, transformers, GFCI's, and receptacles. They also repair or replace sinks, bathtubs, showers, toilets, faucets, water heaters, dish washers, valves, piping, meters, fittings, pumps, venting, and traps.

Maintenance personnel repair or replace roofs, floors, drywall, windows, doors, siding, paint, ceilings, paneling, cabinets, insulation, vapor barriers, trim, furniture, concrete, foundations, stairs, and ventilation systems. They maintain lawns, pools, hot tubs, ground covers, trees, shrubs, and have a basic knowledge of water chemistry. They also are familiar with techniques and chemicals used in building cleaning. Personnel are responsible for water and energy conservation, as well as air and water quality. They are extensively involved in preventive maintenance.

• The University of Montana - College of Technology
• Montana Department of Labor and Industry
• US Environmental Protection Agency
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