Environmental services company Clean Harbors( CLHB) was up 107% in preopen Island trading. A Wall Street Journal article this morning named Clean Harbors as one of the companies whose business is booming as corporations hire private companies to test offices for anthrax.

The company has handled testing at 50 businesses in the last week alone, the article said.

Another company featured prominently in the article is Versar (VSR) . Shares of Versar were unchanged on the preopen Instinet ECN.