I have been a hydrologist with the USGS New Jersey Water Science Center since 1993. My work relates primarily to groundwater systems, numerical modeling, estimating recharge, the use of artificial neural networks, and a variety of water-quality issues including those with detention basins.
I grew up and worked on the family farm until I changed course and earned a B.A. in geology from Franklin and Marshall College and an M.S. in geology from Miami University. Before USGS, I worked for several hydrogeologic consulting firms and spent six years with the New Jersey Geological Survey.
Professional Experience
1993-present, USGS New Jersey Water Science Center, Hydrogeologist, Performed a wide range of project activities including: Developed four numerical ground-water models to assess groundwater flow regimes in southern New Jersey. Coordinated a variety of activities for a study of the occurrence, transport and fate of pollutants in the atmosphere, unsaturated zone, and unconfined-aquifer system
1989-1993, New Jersey Geological Survey, Trenton, NJ, Principal Geologist, Developed a now widely-used empirical methodology to estimate groundwater recharge in New Jersey.
1987-1989, New Jersey Geological Survey, Trenton, NJ, Principal Geologist, Provided technical and regulatory support for groundwater pollution cases.
1987, STS Geotechnical Consultants, Lansing, Michigan, Part-time Assistant Geologist, Provided technical and consulting support for geotechnical and groundwater pollution cases.
1985-1986, Graduate assistant Miami University, Oxford, Ohio, Research Assistant and Teaching Assistant for undergraduate geology courses and a graduate geology course.
1981-1984, Carlyle Gray & Associates, Lancaster, Pennsylvania, Part-time Assistant Geologist, Office and field work for a variety of geological and environmental cases.
Education and Certifications
M.S., Geology, 1989, Miami University, Oxford, Ohio
B.A., Geology, 1984, Franklin and Marshall College, Lancaster, Pennsylvania
Science and Products
Regional chloride distribution in the Northern Atlantic Coastal Plain aquifer system from Long Island, New York, to North Carolina
Simulation of groundwater flow and hydrologic effects of groundwater withdrawals from the Kirkwood-Cohansey aquifer system in the Pinelands of southern New Jersey
Simulated effects of allocated and projected 2025 withdrawals from the Potomac-Raritan-Magothy aquifer system, Gloucester and Northeastern Salem Counties, New Jersey
Application of artificial neural networks to complex groundwater management problems
Effects of stormwater infiltration on quality of groundwater beneath retention and detention basins
Methyl tert‐butyl ether degradation in the unsaturated zone and the relation between MTBE in the atmosphere and shallow groundwater
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Water Levels in the Ten Major Confined Aquifers of the New Jersey Coastal Plain
New Jersey Groundwater Network
Upper Maurice River Surficial Aquifer Study
Toms River Surficial Aquifer Study
Forked River Surficial Aquifer Study
Great Egg Harbor River Surficial Aquifer Study
Rancocas Creek Surficial Aquifer Study
Maurice River Surficial Aquifer Study
Mullica River Surficial Aquifer Study
Salem River Surficial Aquifer Study
Cape May Surficial Aquifer Study
Surficial Aquifer Studies
Science and Products
- Publications
Regional chloride distribution in the Northern Atlantic Coastal Plain aquifer system from Long Island, New York, to North Carolina
The aquifers of the Northern Atlantic Coastal Plain are the principal source of water supply for the region’s nearly 20 million residents. Water quality and water levels in the aquifers, and maintenance of streamflow, are of concern because of the use of this natural resource for water supply and because of the possible effects of climate change and changes in land use on groundwater. The long-terSimulation of groundwater flow and hydrologic effects of groundwater withdrawals from the Kirkwood-Cohansey aquifer system in the Pinelands of southern New Jersey
The Kirkwood-Cohansey aquifer system is an important source of present and future water supply in southern New Jersey. Because this unconfined aquifer system also supports sensitive wetland and aquatic habitats within the New Jersey Pinelands (Pinelands), water managers and policy makers need up-to-date information, data, and projections that show the effects of potential increases in groundwaterSimulated effects of allocated and projected 2025 withdrawals from the Potomac-Raritan-Magothy aquifer system, Gloucester and Northeastern Salem Counties, New Jersey
Withdrawals from the Potomac-Raritan-Magothy aquifer system in New Jersey, which includes the Upper, Middle, and Lower Potomac-Raritan-Magothy aquifers, are the principal source of groundwater supply in northern Gloucester and northeastern Salem Counties in the New Jersey Coastal Plain. Water levels in these aquifers have declined in response to pumping. With increased population growth and develoApplication of artificial neural networks to complex groundwater management problems
As water quantity and quality problems become increasingly severe, accurate prediction and effective management of scarcer water resources will become critical. In this paper, the successful application of artificial neural network (ANN) technology is described for three types of groundwater prediction and management problems. In the first example, an ANN was trained with simulation data from a phEffects of stormwater infiltration on quality of groundwater beneath retention and detention basins
Infiltration of storm water through detention and retention basins may increase the risk of groundwater contamination, especially in areas where the soil is sandy and the water table shallow, and contaminants may not have a chance to degrade or sorb onto soil particles before reaching the saturated zone. Groundwater from 16 monitoring wells installed in basins in southern New Jersey was compared tMethyl tert‐butyl ether degradation in the unsaturated zone and the relation between MTBE in the atmosphere and shallow groundwater
Atmospheric methyl tert‐butyl ether (MTBE) concentrations in southern New Jersey generally exceeded concentrations in samples taken from the unsaturated zone. A simple unsaturated zone transport model indicates that MTBE degradation can explain the attenuation with half‐lives from a few months to a couple of years. Tert‐butyl alcohol (TBA), a possible degradation product of MTBE, was detected in uNon-USGS Publications**
Charles, Emmanuel G., Cyrus Behroozi, Jack Schooley, and Jeffrey L. Hoffman. 1993. A Method for Evaluating Ground-Water-Recharge Areas in New Jersey. NJ Geological Survey Report GSR-32. NJDEP Geological Survey. 95 pages.**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
- Science
Water Levels in the Ten Major Confined Aquifers of the New Jersey Coastal Plain
The Coastal Plain aquifers of New Jersey provide an important source of water for more than 3.5 million people. The USGS, in cooperation with the New Jersey Department of Environmental Protection, has been measuring water levels in the confined aquifers of the New Jersey Coastal Plain every five years beginning in 1978. Persistent, regionally extensive cones of depression are present in Ocean and...New Jersey Groundwater Network
Groundwater is the sole source of water supply for many people in New Jersey. Large-scale groundwater pumpage, installation of sanitary- and storm-sewer systems, and frequent variations in precipitation all have significant effects on regional groundwater levels and aquifer storage. In order to properly manage this resource, there needs to be a consistent dataset of hydrologic data available for...Upper Maurice River Surficial Aquifer Study
Hydrology of the unconfined aquifer system in the Upper Maurice River Basin and adjacent areas in Gloucester County, New Jersey, 1986-87Toms River Surficial Aquifer Study
Hydrology of the unconfined aquifer system, Toms River, Metedeconk River, and Kettle Creek Basins, New Jersey, 1987-90Forked River Surficial Aquifer Study
Hydrology of the unconfined Kirkwood-Cohansey aquifer system, Forked River and Cedar, Oyster, Mill, Westecunk, and Tuckerton Creek Basins and adjacent basins in the southern Ocean County area, New Jersey, 1998-99Great Egg Harbor River Surficial Aquifer Study
Water resources of the unconfined aquifer system of the Great Egg Harbor River basin, New Jersey, 1989-90Rancocas Creek Surficial Aquifer Study
Hydrology of the unconfined aquifer system, Rancocas Creek area: Rancocas, Crosswicks, Assunpink, Assiscunk, Blacks, and Crafts Creek Basins, New JerseyMaurice River Surficial Aquifer Study
Hydrology of the unconfined aquifer system, Maurice River area: Maurice and Cohancey River Basins, New Jersey, 1994-95Mullica River Surficial Aquifer Study
Hydrology of the unconfined aquifer system, Mullica River Basin, New Jersey, 1991-92Salem River Surficial Aquifer Study
Hydrology of the unconfined aquifer system, Salem River area: Salem River, Raccoon, Oldmans, Alloway, and Stow Creek Basins, New Jersey, 1993-94Cape May Surficial Aquifer Study
Hydrogeologic framework, availability of water supplies, and saltwater intrusion, Cape May County, New JerseySurficial Aquifer Studies
The series of surficial aquifer studies were completed to evaluate the unconfined aquifer system of the NJ Coastal Plain for use as a potential source of water. As the demand for water in the State increases and the restrictions continue on the use of water from certain confined aquifers, withdrawals on the unconfined aquifer system are expected to increase. Detailed study of the unconfined... - Multimedia