True Detective Season 2 Episode 7: Black Maps and Motel Rooms. Written by Nic Pizzolatto (airs Sunday, August 2nd) Ray (Colin Farrell), Ani (Rachel McAdams) and Paul (Taylor Kitsch) take precautionary measures to elude detection and untangle a dark mystery. Frank (Vince Vaughn) deals with the fallout of his betrayal.
The permeability of the rock samples is likely to be â permeable-sandstone, chalk; impermeable â clay, slate, marble, granite. This may vary according to the samples, e.g. some sandstones may have a mixture of grain sizes and may have poor permeability.
An aquifer is an underground layer of water-bearing permeable rock. 1  The casing protects aquifers which may contain freshwater. 2  Aquifers are water-bearing geologic formations that can provide usable amounts of water. 3  An aquifer is an underground layer of water-bearing permeable rock.