Michael J. Focazio

• A retrospective analysis on the occurrence of arsenic in ground-water resources of the United States and limitations in drinking-water-supply characterizations
• Assessing ground-water vulnerability to contamination
• Documentation of geographic-information-system coverages and data-input files used for analysis of the geohydrology of the Virginia Coastal Plain
• Estimating net drawdown resulting from episodic withdrawals at six well fields in the coastal plain physiographic province of Virginia
• Occurrence of selected radionuclides in ground water used for drinking water in the United States
• Selected characteristics of stormflow and base flow affected by land use and cover in the Chickahominy River Basin, Virginia, 1989-91