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An ungrounded person would be an isolated conductor, and the same rule would apply as for insulators, to keep at least 12" from ESD sensitive items.
Per ANSI/ESD S20.20 Paragraph 126.96.36.199. Protected Areas Guidance "All process essential insulators that have electrostatic fields that exceed 2,000 volts should be kept at a minimum distance of 12 inches from ESDS items."
Per ESD Handbook TR 20.20 paragraph 2.4 "It should be understood that any object, item, material or person could be a source of static electricity in the work environment. Removal of unnecessary nonconductors, replacing nonconductive materials with dissipative or conductive materials and grounding all conductors are the principle methods of controlling static electricity in the workplace, regardless of the activity."