This series of annual reports for Maryland and Delaware began with the 1961 water year with a report that contained only data relating to the quantities of surface water. For the 1964 water year, a similar report was introduced that contained only data relating to water quality. Beginning with the 1975 water year, the report format was changed to present, in one volume, data on quantities of surface water, quality of surface and ground water, and ground-water levels.In the 1989 water year, the report format was changed to two volumes. Both volumes contained data on quantities of surface water, quality of surface end ground water, and ground-water levels. Volume 1 contained data on the Atlantic Slope Basins (Delaware River thru Patuxent River) and Volume 2 contained data on the Monongahela and Potomac River basins. Beginning with the 1991 water year, Volume 1 contains all information on quantities of surface water and surfacewater-quality data and Volume 2 contains ground-water levels and ground-water-quality data. This report is Volume 2 in our 1993 series and includes records of water levels and water quality of ground-water wells and springs. It contains records for water levels at 365 observation wells, discharge data for 5 springs, and water quality at 151 wells. Location of ground-water level wells are shown on figures 3 and 4. These data represent that part of the National Water Data System collected by the U.S. Geological Survey and cooperating State and Federal agencies in Maryland and Delaware.

II6DIII. 8BS(WIII!I3S D6D -MQYI.AIID .6110 DEl "MARE. 1994 VOLUHE 2. GROUND-HATER DATA This aeries of annual reports for Maryland and Delaware began with the 1961 water year with a report that contained only data relating to the quantities of surface water. For the 1964 water year, a similar report was introduced that contained only data relating to water quality. Beginning with the 1975 water year, the report format was changed to present, in one volume, data on quantities of surface water, quality of surface and ground water, and around-water levels.In the 1989 water year, the report format was changed to two volumes. Both volumes contained data on quantities of surface water, quality of surface and ground water, and ground-water levels. Volume 1 contained data on the Atlantic Slope Basins (Delaware River thru Patuxent River) and Volume 2 contained data on the Monongahela and Potomac River basins. Beginning with the 1991 water year, Volume 1 contains all information on quantities of surface water and surfacewater-quality data and Volume 2 contains ground-water levels and ground-water-quality data. This report is Volume 2 in our 1994 aeries and includes recorda of water levels and water quality of ground-water walla and springs. It contains recorda for water levels at 422 observation walla, discharge data for 5 springs, and water quality at 168 walls. Location of ground-water level walla are shown on figures 3 and 4.The location for the around-water-quality sites are shown on figure 5.These data represent that part of the National Hater Data System collected by the U.S. Geological Survey and cooperating State and Federal agencies in Maryland and Delaware.Prior to introduction of this aeries and for several water years concurrent with it, waterresources data for Maryland and Delaware were published in U.S. Geological Survey Hater-Supply Papers. Data on water levels for the 1935 through 1974 water years were published under the title "Grouod~atar LavaLa iD tba Uoitad States.• The above mentioned Hater-Supply Papers may be consulted in the libraries of the principal cities of the United States and may be purchased from Books and Open-

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I as a testing ground for munitions, including chemical-warfare agents. From shortly after World War II into the 1970's, chemicalwarfare agents, high-explosive munitions, and industrial chemicals were tested and disposed of at J-Field by open-pit burning and by highexplosive demolition. Only emergency disposal operations have been conducted at J-Field since the early 1980's. Soil, surfacewater, and groundwater contamination has resulted from the migration of unburned chemicals and fuels from the disposal areas. Discharge of contaminants from ground water and runoff has resulted in surface-water contamination in the marshes and ponds in J-Field. This investigation was conducted from 1989 to 1994 as part of a remedial investigation of J-Field in response to Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) requirements. The nature and extent of contamination was assessed at five sites: the toxic-materials disposal area, the white-phosphorus disposal area, the riotcontrol-agent disposal area, the Robins Point