plaine (1) aquifère (1) métal lourd (1) eaux souterraines (1) conductivité (1) cation (1) Article (1) Columbia Aquifer (1) Wells (1) Water chemistry (1) Groundwater (1) Water (1) Values (1) Saltwater encroachment (1) Rest (1) Grammar, Comparative and general--Article (1) Gifts (1) Fresh water (1) Exchange (1) Deals (1) Chlorides (1) Article (1) Aquifers (1) Addition (1)