>Fracking uses 99.5% sand & water in the process that takes place thousands of feet below the surface. Average aquifiers are a few hundred. One must ignore the law of gravity to justify the claims yet they persist.

Fracking, done correctly, should pose no problems. Humans, however are notorious for doing things incorrectly. If wells are not correctly completed through aquifers and productive shale zones there is certainly the potential for contamination.