For those who want to see a short 6 minute video showing how horizontal drilling and fracking is done Northern Gas and Oil has done a great video.
This includes a piece on how groundwater contamination is avoided:
http://www.northernoil.com/drilling-video
Knowledge is power, keep the link and pass it on.
Except for one part, I agree with the video. An intermediate casing should have been installed and cemented from the base of the surface casing to the “kick off point” with the cement circulated to the surface in the annulus between the surface and intermediate strings.