Contents: GROUNDWATER GEOCHEMISTRY FUNDAMENTALS,The Aquifer Geochemical System,Groundwater Solution,Chemical Reactions and the Equilibrium Constant,Soil/Rock Composition,Water/Rock Processes Controlling Solution Composition,Solution, Redox, and Gas Exchange Processes,Aqueous Complexation,Oxidation/Reduction Processes,Solution/Gas Interactions,Water/Rock Interactions,Adsorption/Desorption,Mineral Precipitation/Dissolution,Reaction Rates,Development of Conceptual Geochemical Models,Modeling Data Requirements,Elements of a Conceptual Model,Geochemical Modeling Methods,Computer Codes for Geochemical Modeling,Mass Balance Modeling Codes,Equilibrium Speciation/Solubility Modeling Codes,Equilibrium Mass Transfer Modeling Codes,Mass Transport,Geochemical Modeling Limitations,GENERAL GEOCHEMICAL APPLICATIONS,Geochemical Models,Mobility of Iron in the Natural Environment,Modeling Calcite Mineral Precipitation in Response to Groundwater Heating,Modeling the Aeration of Groundwater,Geochemistry of Contaminant Mobility,Contaminant-Induced Disequilibrium,Solubility Limits on Contaminant Concentration in Groundwater,Mineral Equilibria of Contaminants,Adsorption/Desorption Impact on Contaminant Migration,Contaminant Migration Summary,Geochemistry of Restoration,Natural Restoration,Geochemical Principles of Aquifer Restoration,Applied Restoration Techniques,Geochemical Enhancements to Pump-and-Treat Restoration,Simulating the Geochemistry of Restoration,Geochemistry and the Design of Sampling Programs,Temperature,Hydrogen Ion Activity (pH),Redox Potential (Eh),Dissolved Gases,Alkalinity,Major Cation and Anions,Minor and Trace Dissolved Constituents,Reactive Solid Phases,APPLICATIONS OF GEOCHEMISTRY TO SPECIFIC TYPES OF CONTAMINANTS AND CONTAMINATED ENVIRONMENTS,Practical Applications: Landfills,Geochemical Environment,Sampling Considerations,Geochemical Reaction Modeling,Contaminant Mobility,Remediation,Practical Applications: Metals Contamination,Geochemical Environment,Sampling Considerations,Geochemical Reaction Modeling,Contaminant Mobility,Remediation,Geochemistry of Acid Mine Waste,Acid-Generating and -Neutralizing Processes,Acidic Environments,Sampling Considerations,Geochemical Modeling,Contaminant Transport,Remediation,Geochemistry of Organic Compound Contamination,Representative Types of Organic Contamination,Sampling Considerations,Geochemical Modeling,Contaminant Transport,Remediation