Mary Martin Chepiga

Water Science • Water-Supply Assessment Using Numerical Simulation • Groundwater Flow, Solute-Transport • Groundwater/Surface Water Interactions • Water-Budgets, Source of Water to Wells  

Biography

Mary Martin Chepiga is a Supervisory hydrologist with the U.S. Geological Survey, where she has worked since 1979. 

 Education

M.S.  Geology          The Pennsylvania State University, 1979

B.A.  Geosciences   University of Wisconsin-Milwaukee, 1976 

Professional Experience

2003-present  Supervisory Hydrologist, USGS New Jersey Water Science Center

2003-present    Chief Hydrologic Simulation Program, responsible for technical and fiscal integrity of projects involving the simulation of ground-water flow, solute-transport, and ground-water/surface-water interactions.  Supervises and provides technical support for numerical modeling projects.  recent and current projects include: 1) a water-budget analysis of ground-water flow in the confined Coastal Plain Aquifers of NJ  as part of the NJDEP Water Supply Master Plan, 2) a MODFLOW and MODPATH analysis of ground-water flow and conservative particle movement in the lower confined aquifers of Salem-Gloucester Counties, 3) A GWM optimization analysis of available withdrawals within the Critical Areas of NJ, 4) a MODFLOW and MODPATH analysis of ground-water flow and conservative particle movement in the unconfined and upper confined aquifers of the Great Egg/Mullica basins and 5)  a MODFLOW and MODPATH analysis of ground-water flow and conservative particle movement in the unconfined and upper confined aquifers of the Ocean County Area.

                                Continuing work on Delaware River Basin SPARROW nutrient modeling study as a co-principal investigator to provide additional analysis, model calibration and documentation.

2002-2004        Project chief, Delaware River Basin SPARROW nutrient modeling study.  Developed and analyzed spatially-referenced regression model of total phosphorous and total nitrogen loads in DRB streams.

1982-1994        Hydrologist, USGS New Jersey Water Science Center

1986-1994        Toxic Substances Program, Picatinny Arsenal Project. Developed, calibrated, and documented multispecies transport model used to evaluate fate and movement of chlorinated solvents in ground-water.  Developed model code for reactive multispecies transport in two-dimensional ground-water flow systems.

1988-1991       Ground-water modeling specialist.  Technical advisor on ground-water modeling studies and provided technical support to project staff on hydrologic analysis, model development, programming, and model calibration.

1985-1986        USGS Graduate Training Program, attended Rutgers University, departments of Biochemical Engineering and Computer Science.

1982-1985        Northern Atlantic Coastal Plain RASA ground-water flow modeling study.  Calibrated and documented multi-layer ground-water flow model of 10 aquifers in NC, VA, MD, DE, NJ and NY for the national Regional Aquifer Study Analysis project. Model defined prepumping and 1980 flow conditions.

1982-1985       Project chief, New Jersey RASA ground-water flow modeling study.  Developed, calibrated, and documented multi-layer ground-water flow model of the NJ Coastal Plain aquifers for the national Regional Aquifer Study Analysis project.  Model defined prepumping and 1978 flow conditions in 10 aquifers.

1979-1982       Hydrologist, USGS Delaware District

1980-1982       Project chief, Delaware coastal plain ground-water flow modeling study.  Designed, implemented, and supervised monitoring, well drilling, and aquifer tests.  Developed, calibrated, and documented multi-layer ground-water flow model used to evaluate the effects of future withdrawals