Vintage Enka Postcard

Brian Cook found this postcard online. It looks like there's only one smokestack in this picture. Does anyone know when the second one was added?

American Enka smokestacks to be taken down Tuesday Morning (12/18)

Here's the article from the Citizen-Times:

http://www.citizen-times.com/apps/pbcs.dll/article?AID=200771217029