Maintenance Employees may be exposed to toxic or caustic chemicals in a ventilated maintenance shop and may work with personal computers, laptops, electronic hand-held devices, complex electrical schematics, diagnostic software and testing devices, and other heavy machinery. Long periods (potentially exceeding 8 hours per day) of walking, standing, sitting, bending, pushing, pulling, climbing, lifting, balancing, stooping, twisting, squatting, handling materials, repetitive hand-wrist motions, and traversing uneven surfaces;