Pretty sure the big risk is leaking into the water table. See: http://large.stanford.edu/courses/2015/ph241/khalaf2/ http://large.stanford.edu/courses/2015/ph2

Pretty sure the big risk is leaking into the water table. See: http://large.stanford.edu/courses/2015/ph241/khalaf2/ http://large.stanford.edu/courses/2015/ph241/khalaf2/