Judith M. Denver, Hydrologist/Study Unit Chief

Education

M.S.

University of Delaware, College of Marine Studies, M.S. (Marine Studies), 1996.

B.S.

University of Delaware, Newark, Delaware, B.S. (Geology), 1977.

Research Interests

Geochemistry of Coastal Plain ground-water systems affected by agricultural chemicals; transport and transformation of agricultural chemicals from ground-water to surface water and the effects of wetlands on water chemistry; effects of different geologic settings on the geochemistry of ground and surface waters, identification of the chemical characteristics of natural and anthropogenically-affected waters

Professional Experience

-- 1997-present, Project Chief, National Water-Quality Assessment Program (NAWQA), Delmarva Peninsula and Potomac River Basin and Delmarva Peninsula Study Units, and regional synthesis of ground-water quality data in the Mid-Atlantic Coastal Plain, New Jersey through North Carolina

-- 1996-1997, Sub-District Chief, Delaware Office of the Maryland-Delaware-DC District.

-- 1980-1997, Project Chief in the Delaware office working on numerous cooperative and federal projects related to the transport and transformation of anthropogenic chemicals in unconfined Coastal Plain aquifer systems. Work included investigation of the effects of agricultural chemicals and septic-system effluent on ground-water chemistry, the water-quality function of wetlands, transport and transformation of nutrients in aquifer and near-stream environments, the effects of geologic setting on water chemistry and chemical transport, and the transport and transformations of pesticides in ground water.

Selected Publications

Ator, S.W., Denver, J.M., Pitchford, A.M., 2001, Developing landscape indicator models for pesticides and nutrients in streams of the Mid-Atlantic Coastal Plain: U.S. Geological Survey FS-157-00, 4 p.

Ator, S.W., Denver, J.M., and Hancock, T.C., 2000, Relating shallow ground-water quality to surficial hydrogeology in the Mid-Atlantic Coastal Plain: Proceeding of the National Water-Qulaity Monitoring Conference, Austin Texas, April 25-27, 2000, p. 409-423.

Bohlke, J.K., and Denver, J.M., 1995, Combined use of groundwater dating, chemical, and isotopic analyses to resolve the history and fate of nitrate contamination in two agricultural watersheds, Atlantic Coastal Plain, Maryland: Water Resources Research, v. 31, no. 9, p. 2319-2339.

Denver, J.M.,1993, Herbicides in shallow ground water at two agricultural sites in Delaware: Newark Delaware, Delaware Geological Survey, Report of Investigations No. 51, 28 p.

Denver, J.M., 1991, Groundwater-sampling network to study agrochemical effects on water quality in the unconfined aquifer, Southeastern Delaware in Nash, R.G. and Leslie, A.R., eds., Groundwater Residues Sampling Design: American Chemical Society, Washington, DC, p. 139-149.

Denver, J.M., 1989, Effects of agricultural practices and septic-system effluent on the quality of water in the unconfined aquifer system in parts of eastern Sussex County, Delaware: Newark, Delaware, Delaware Geological Survey, Report of Investigations No. 45, 66 p.

Denver, J.M., 1986, Hydrogeology and geochemistry of the unconfined aquifer in west-central and southwestern Delaware: Newark, Delaware, Delaware Geological Survey, Report of Investigations No. 41, 100 p.

Denver, J.M., and Sandstrom, M.W., 1991, Distribution of dissolved atrazine and two metabolites in the unconfined aquifer, southeastern, Delaware-U.S. Geological Survey Toxic Substances Hydrology program, Proceedings oif the Technical Meeting, Monterey, California: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 314-318.

Dunkle, S.A., Plummer, L.N., Busenberg, Eurybiades, Phillips, P.J., Denver, J.M., Hamilton, P.A., Michel, R.L., and Coplen, T.B., 1993, Chlorofluorocarbons (CCl3F and CCl2F2) as dating tools and hydrologic tracers in shallow groundwater of the Delmarva Peninsula, Atlantic Coastal Plain, United States: Water Resources Research, v. 29, no. 12, p. 3837-3860.

Hamilton, P.A. Denver, J.M., Phillips, P.J., and Shedlock, R.J., 1993, Water-quality assessment of the Delmarva Peninsula, Delaware, Maryland, and Virginia-Effects of agricultural activities on, and the distribution of, nitrate and other inorganic constituents in the surficial aquifer: U.S. Geological Survey Open-File Report 93-40, 87 p.

Lowrance, Richard, Altier, L.S., Newbold, J.D., Schnabel, R.R., Groffman, P.M., Denver, J.M., Correll, D.L., Gilliam, J.W., Robinson, J.L., Brinsfield, R.B., Stave, K.W., Lucas, William, Todd, A.H., 1995, Water quality function of riparian forest buffer systems in the Chesapeake Bay watershed: Chesapeake Bay Program Technology Transfer Report, EPA903-R-95-004, 67 p.

Phillips, P.J., Denver, J.M., Shedlock, R.J., and Hamilton, P.A., 1993, Effect of forested wetlands on nitrate concentrations in ground water and surface water on the Delmarva Peninsula: Wetlands, v. 13, no. 2, p. 75-83.

Pitchford, A.M., Denver, J.M., Olson, A.R., Ator, S.W., Cormier, S., Nash, M.S., and Mehaffey, M.H., 2000, Testing landscape indicators for stream condition related to pesticides and nutrients - Landscape Indicators for Pesticides Study for Mid-Atlantic Coastal Streams (LIPS-MACS): U.S. Environmental Protection Agency EPA/600/R-00/087, 84 p.

Shedlock, R.J., Denver, J.M., Hayes, M.A., Hamilton, P.A., Koterba, M.T., Bachman, L.J., Phillips, P.J., and Banks, W.S.L., 1999, Water-quality assessment of the Delmarva Peninsula, Delaware, Maryland, and Virginia: Results of investigations, 1987-1991, U.S. Geological Survey Water-Supply Paper 2355-A, 41 p.

Shedlock, R.J., Hamilton, P.A., Denver, J.M., and Phillips, P.J., 1993, Multiscale approach to regional ground-water-quality assessment in Alley, W.M., ed., Regional Ground-Water Quality: New York, Van Nostrand Reinhold, p. 563-587.