Click the red triangle near 101 / 237 interchange in Sunnyvale on the google maps link from the footer of the article, you'll get this page:

http://geotracker.waterboards.ca.gov/gama/gamamap/public/clu...

It's sorted in descending order by max level of TCE detected at each well, ever. The top three wells are 140k (ca 2006), 110k (ca 2009), and 100k (ca 2007) micrograms / liter.

There's a similar site by the Sunnyvale Fry's on Arques, but that one's peak detection was 74.7k ug/L.