[mtviewdave]

I would doubt the groundwater contamination at Moffett Field would migrate inland. Groundwater in Mountain View moves in the direction of the bay.

The groundwater contamination in Mountain View proper comes from the many companies that manufactured semiconductors and other electronics in the '50s through the '80s. Many of which did a poor job disposing of the chemicals they used in electronics manufacturing.

[ericbarrett]

If you walk the trails around Stanford, both College Terrace and the Dish, you’ll see sampling tubes for monitoring soil quality because of this.

[iancmceachern]

And often had leaking underground tanks.