Lead Hazards Real To the Editor: Thanks for the update on what OSHA is planning for regulating lead safety issues (Eight Penny News, "OSHA May Regulate Work-Site Lead Exposure," 2/93). I've worked on historic structures for 30 years, always with considerable concern about lead paint and lead poisoning, and would like to add the following comments: (1) Lead poisoning is cumulative, and affects the intelligence of adults as well as that of children. (2) Lead paint is not only a problem when it is attached to the house, it can also be a serious health risk in the soils around houses. I have estimated that some large 19thcentury houses that have been painted on a regular basis often have in excess of