Ground water Discharge Geochemistry Hydrochemistry Pollution Surface water USGS Water quality Alkaline earth metals Aquifers Bangor Limestone Bedload Big Black Creek basin Biochemical oxygen demand Biota Carboniferous Coastal environment Color hydrogeol. map Concentration Cretaceous Drainage basins Environmental geology Fluid dynamics Gauging Hydrogeologic maps Hydrogeology Hydrology Invertebrata Iron Land use