This is nothing new–they use acids when they frack–but Reuters wrote about it and it’s good to get on the radar.
INSIGHT-California environmentalists fear frack fight a distraction
By Rory Carroll and Braden Reddall, 5/28/13, Reuters
Acid jobs are not new and neither is using “super-hazardous, poisonous chemicals.”
The use of these acids and more were revealed in the Congressional report: CHEMICALS USED IN HYDRAULIC FRACTURING. You should download this report and read it often. I reference it all the time.