Introduction to groundwater theories, Groundwater in the hydrologic cycle, Quality of groundwater. Sources of pollutions, Pollution in relation in water use, Measures of water quality, Water quality criteria, Distribution of pollution underground. Properties of aquifers: porosity, hydraulic conductivity, specific yield, specific storage, transmissivity. Mass transport of solutes in saturated media, Diffusion, Advection, Mechanical dispersion, Hydrodynamic dispersion. Transformation, Retardation and attenuation of solutes. Numerical methods in groundwater flows (finite differences), different initial and boundary conditions, stability of scheme. MT3D-MS Description, External source and stress, Solver packages, Case study. Remediation technologies of polluted groundwater.