▁in ▁the ▁waters ▁of ▁Lim estone ▁Run ▁and ▁its ▁trib ut aries ▁r anged ▁from ▁ 8 . 2 ▁to ▁ 2 1 . 5 ▁mill igr ams ▁per ▁liter ▁on ▁September ▁ 2 0 , ▁ 2 0 0 3 . ▁The ▁concentration ▁was ▁ 8 . 2 ▁mill igr ams ▁per ▁liter ▁near ▁the ▁stream ' s ▁head w aters , ▁ 1 9 . 5 ▁mill igr ams ▁per ▁liter ▁in ▁the ▁middle ▁reaches ▁of ▁the ▁stream , ▁ 2 0 . 0 ▁mill igr ams ▁per ▁liter ▁slightly ▁up stream ▁of ▁Lewis burg , ▁ 2 1 . 4 ▁mill igr ams ▁per ▁liter ▁in ▁Lewis burg , ▁and ▁ 2 1 . 5 ▁mill igr ams ▁per ▁liter ▁slightly ▁up stream ▁of ▁the ▁mouth . ▁The ▁ch lor ide ▁concentration ▁on ▁several ▁of ▁Lim estone ▁Run ' s ▁trib ut aries ▁r anged ▁from ▁ 1 1 . 3 ▁to ▁ 1 7 . 5 ▁mill igr ams ▁per ▁liter . ▁ ▁The ▁concentration ▁of ▁sul f ates ▁in ▁the ▁Lim estone ▁Run ▁waters hed ▁r anged ▁from ▁ 2 5 . 5 ▁to ▁ 4 2 . 1 ▁mill igr ams ▁per ▁liter ▁on ▁October ▁ 1 8 , ▁ 2 0 0 3 . ▁The ▁concentration ▁was ▁ 2 5 . 5 ▁mill igr ams ▁per ▁liter ▁near ▁the ▁head w aters , ▁ 3 7 . 7 ▁mill igr ams ▁per ▁liter ▁in ▁the ▁middle ▁of ▁the ▁stream , ▁ 4 0 . 7 ▁mill