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'• 40 EVALUATION OF GROUND WATER REMEDIATION Draft TECHNOL O GIES Based on the conclusions presented in the previous section, ERM evaluated ground water remediation technologies to determine the Best ' Available Technology (BAT) for further reducing the concentrations of TPH-g and BTEX compounds in ground water immediately downgradient of each former UST location 4.1 GROUND WATER REMEDIATION TECHNOLOGIES ERM evaluated several potentially applicabie ground water remediation technologies, including • Ground water air sparging, ' . Fenton's oxidation, o Ground water extraction and treatment, and G Enhanced bioremediation (via injection of oxygen releasing compound [ORQ i ' Each technology was evaluated based on the technology's applicability to the site conditions (hydrogeologic conditions and chemical types), the estimated duration required to achieve a reduction in chemical ' concentrations, and estimated costs (capital and long-term) ' In evaluating the various ground water remediation technologies, the primary limiting factor is the low permeability of the site soils The low permeability of the soils would severely limit the influence of air sparging ' wells, the influence of Fenton's oxidation, the drawdown of extraction wells, and the distribution of ORC The following subsections present the ' rationale for elimination of three of the technologies and presents the best available remedial technology for the site 4.1.1 Air Sparg-ing Air sparging was not selected as the remedial technology because, based ' on the shallow ground water and low permeability of soils, effective distribution and collection of sparging vapors would be extremely difficult to achieve Also, the installation of an air sparging system would cause disruption to existing site conditions since an air sparging system ' 12