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An 8-month reconnaissance study of the relation between land use and ground-water quality in two areas of the Gulf Coastal Plain was conducted as part of the U.S. Geological Survey Toxic Waste Ground-Water Contamination Program. The study areas, located in the vicinities of Baton Rouge, Louisiana, and Gulfport, Mississippi, encompassed about 175 and 150 square milea, respectively. A preliminary assessment of shallow aquifer characteristics, ground-water movement, quality of ground water, and contamination, or the potential for contamination of shallow aquifers was made in three areas with specific land-uses. The land-use types industrial, mixed agricultural-forested, and forest land are typical of the southwestern part of the Gulf Coastal Plain. Organic compounds were detected in aquifers in each land-use area and were present in greater number and in higher concentrations in water from wells in the industrial land-use area than in the mixed agriculturalforested land-use area. Organic compounds on the U.S. Environmental Protection Agency priority pollutant list were detected in water from two wells in the industrial landuse area and one well in the mixed land-use area. Chloride concentrations in three wells in the industrial land-use area indicate brine contamination. Trace-element contamination, including barium and manganese, was detected in water from some wells. Barium concentrations of 800, 900, and 2,000 micrograms per liter were present in water from three wells in the industrial land-use area. Manganese concentrations in the industrial area ranged from below detection levels to 2,300 micrograms per liter. Concentrations in water from 9 of 12 wells exceeded U.S. Environmental Protection Agency quality criteria (50 micrograms per liter) for water supplies. The vertical movement of water through surficial deposits has potential for longterm aquifer contamination from surface and subsurface waste-disposal activities. Further study is needed to better understand the complex geohydrology, chemistry of water and sediments, and the age of resident aquifer water.

A Reconnaissance study to relate land use and ground-water quality in the Gulf Coastal Plain of Louisiana and Mississippi