“One of Silicon Valley’s dirty secrets is coming back to haunt Google with toxic vapors,” CBS San Francisco reports.

“TCE, or trichloroethylene vapors were detected at the company’s offices in Mountain View,” CBS SF reports. “Google’s buildings QD6, and QD7, which sit on North Whisman road sit on top of what used to be Fairchild Semiconductor, Intel, Raytheon, and other computer chip makers.”

“The EPA’s screening level for commercial buildings is 5 micrograms per cubic meter. Most of Google’s air sample stations in the two buildings detected TCE levels below 5 micrograms per cubic meter. But about a dozen stations reported readings from 5 to 30 micrograms per cubic meter. One station reported 120 micrograms per cubic meter. Air samples are collected over 8 to 10 hour span,” CBS SF reports. “It takes decades of TCE exposure at elevated levels to cause medical problems, according to the EPA.”

Read more in the full article here.

MacDailyNews Take: Mole holes.

[Thanks to MacDailyNews Reader "Dave8112" for the heads up.]