DNR to study possible link between frac sand mines, contaminated groundwater
![DNR to study possible link between frac sand mines, contaminated groundwater](http://bloximages.chicago2.vip.townnews.com/lacrossetribune.com/content/tncms/assets/v3/editorial/3/00/300aabf9-d108-5e3c-9c5c-5d388de3bf01/5814702edafee.image.jpg?resize=300%2C200)
Some neighbors of the mines are concerned dangerous heavy metals are leaching into their drinking wells.
Some neighbors of the mines are concerned dangerous heavy metals are leaching into their drinking wells.