LEACHATE GEOCHEMISTRY AT A MUNICIPAL LANDFILL, MEMPHIS, TENNESSEE

A leachate plume emanating from the Shelby County Landfill located at Memphis, Tennessee is defined using selected major and trace inorganic constituents. High specific conductance values and elevated concentra tions of ammonia, barium, boron, calcium, chloride, dissolved solids, potassium, sodium, and strontium were measured in water samples from w ells screened in the alluvial and Memphis aquifers downgradient from o r proximal to the landfill. Of these constituents, barium, boron, chlo ride, and strontium were used in the geochemical model code PHREEQE to estimate the percent leachate component in selected Memphis aquifer s amples. Estimates of the leachate component in samples from affected M emphis aquifer wells range from 5 to 37 percent for barium and stronti um, the most reliable tracers found during this study.