Most importantly, have those employees contact a medical professional for guidance.  Next, notify everyone on the project or office, that they may have been exposed to someone with COVID-19. They also should contact a medical professional for guidance. At this point, most people will need to self-quarantine for up to 14 days. With medical guidance that period may be reduced to 5-6 days. Finally, it is time to stop all work on the project until such time you are certain the original exposure did not result in a positive COVID-19 test result. You will have to trace the reporting employee’s whereabouts to determine who he or she may have come in contact with on the jobsite or even jobsites. This can be a particularly cumbersome job if the employee or another employee traveled between jobs.