1) CCXXX x V 2) CXV times X 3) Maximum contaminant level 4) Mid 12th-century date 5) Mid-12th century date 6) Middle of the 12th century 7) Roman 1,150 8) Twelfth-century year 9) Twice DLXXV 10) Xxiii x l 11) XXIII x X x V Found on https://www.crosswordclues.com/clue/mcl