ADA (The Americans with Disabilities Act) prohibits discrimination against individuals with disabilities in all areas of public life, including jobs, schools, transportation, and all public and private places that are open to the general public. Ramps that will be used by the general public must conform to ADA specifications.
OSHA is the division of the Department of Labor that sets and enforces occupational health and safety rules. Ramps that are primarily intended for non-public access need to be OSHA compliant.
Call us if you're unsure about which of these applies to your job.