I found this:
MANY people are convinced that fracking is the source of gas and oil in well water. I’ve kept an open mind, while suspecting the conclusions might be premature.
Organic compounds found in drinking water aquifers above the Marcellus Shale and other shale plays could reflect natural geologic transport processes or contamination from anthropogenic activities, including enhanced natural gas production. Using analyses of organic compounds coupled with inorganic geochemical fingerprinting, estimates of groundwater residence time, and geospatial analyses of shale gas wells and disclosed safety violations, we determined that the dominant source of organic compounds to shallow aquifers was consistent with surface spills of disclosed chemical additives. There was no evidence of association with deeper brines or long-range migration of these compounds to the shallow aquifers. Encouragingly, drinking water sources affected by disclosed surface spills could be targeted for treatment and monitoring to protect public health. [emphasis added by me]
To me, surface spills/leaks are a wild card in this that, for some reason, I missed as a possibility. And it makes sense. Continue reading