This manual describes the operation of the CONTAM (Computerized Soil and Water Quality Analysis Model) computer program. CONTAM is a computer program for analyzing the concentrations of contaminants in soil and water samples. It allows users to calculate the concentrations of contaminants in water from soil samples, and to calculate the rate of migration of contaminants from soil to water. CONTAM includes a database containing information about the properties of various contaminants in water and soil. CONTAM also includes a user interface that allows users to enter concentrations of contaminants in soil and water samples and other information to calculate concentrations of contaminants in water and the rate of migration of contaminants from soil to water.