According to a recent OSHA complaint, Legacy T at$t employees may have been exposed to methylene diphenyl diisocyanate (MDI) at the at$t 360 Gees Mill Business Parkway work location in Conyers Georgia while installing and repairing fiber optics in confined spaces. Please notify your local union representative immediately if the encapsulant being used in your work location in not isocyanate free, such as the type in use at Legacy B and S work locations . Download the attached PDF file for more information. In Unity-Strength & Solidarity: Steve Tisza, President, CWA Local 4250, Chicago.