• Ground Water Contamination of the Estes Landfill, Phoenix, Arizona

      Budzinski, Joan; Angell, James; City of Phoenix; Arizona Department of Health Services (Arizona-Nevada Academy of Science, 1983-04-16)
      The ground water contamination potential of the Estes Landfill, Phoenix, Arizona has been evaluated by the City of Phoenix and the Arizona Dept. of Health Services. The landfill is located in a recharge zone of the Salt River Valley aquifer. The aquifer is under water table conditions. The depth to ground water ranges from 80 feet to 15 feet. Ground water monitoring wells were installed up- gradient and down -gradient from the landfill. Ground water samples collected from the wells during flow events of the Salt River indicated leachate production from the landfill; a mound of ground water develops and intrudes the solid waste. The leachate characteristics include volatile organics and heavy metals: vinyl chloride, trichloroethylene and barium. Analysis of solid waste borings indicated only small quantities of organics and heavy metals. Currently the ground water is used for industrial and agricultural purposes. However, the ground water could be used as a domestic water supply because it has an acceptable ambient water quality. Ground water monitoring is continuing with the intent of using the data to design a leachate migration control system for the landfill and to distinguish contaminants from an adjacent landfill.
    • Volatile Organic Ground Water Contamination in the Tucson Airport Super Fund Area, Tucson, Arizona

      Eberhardt, Sandra; Beilke, Pamela; Angell, James; Arizona Department of Health Services (Arizona-Nevada Academy of Science, 1983-04-16)
      The Tucson Airport Super Fund Area is currently being investigated by the Environmental Protection Agency, the Arizona Dept. of Health Services, the City of Tucson and the Arizona Dept. of Water Resources for volatile organics and heavy metal ground water contamination. The volatile organics include trichloroethylene (TCE), trichloroethane (TCA), dichloroethylene (DCE) and heavy metals, primarily chromium. The area is defined as north of Los Reales Rd. to distinguish this contamination from the US Air Force Plant No. 44 contamination south of Los Reales Rd. The investigation includes defining the hydrogeology, the extent of ground water contamination and potential contamination sources. The aquifer being contaminated is located in the Upper Santa Cruz Basin and is the principal source of domestic water for the City of Tucson. The area of concern currently contains 177 water wells; 24 of these wells are contaminated with TCE concentrations ranging from 5 ug /1 to greater than 400 ug /l. This includes 6 City of Tucson public supply wells. There are currently 6 potential contamination sources being investigated. The first phase of Super Fund will enable the State and City governments to collect and analyze data which will be used for remedial action.