Our HR department will question the employee to determine their foot traffic and interaction with other personnel in the plant. The CDC guidance is less than 6 feet from other persons with 10 minutes or longer exposure. Based on this we would quarantine all individuals who apply under the CDC exposure guidance.
We would also immediately shut down the plant, send employees out to their cars to await disposition / quarantine measures, and key personnel disinfect all common touch surfaces in the plant. Plant resumes production after disinfection and quarantining.
It will be interesting if it is an employee who goes everywhere in the plant and interacts with almost everyone, like my QA personnel. Effectively, my entire department would need to be quarantined and that'll be a good time if it happens.