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EVALUATING RISKS OF EXPOSURE TO TOTAL PETROLEUM HYDROCARBONS
Impact/Purpose:
Risk-based cleanup goals will be investigated to facilitate a consistent and uniform approach for the remediation of petroleum release sites in Region IX. Intended users include remedial project managers, risk assessors, and risk managers who formulate cleanup decisions for petroleum release sites throughout the region.
Description:
This project will investigate dissolution and partitioning of TPH in soil and groundwater by performing laboratory soil column studies and evaluating available field data. Dissolution and transport models will then be used to evaluate field and laboratory dissolution data. Experimental data and modeling results will be used to evaluate and develop DAFs for leaching of petroleum hydrocarbons from soil to ground water. Finally, updated partitioning and DAF information will be used along with a four-phase partitioning model, based on the TPHCWG approach developed by the State of Washington (Washington Department of Environmental Quality 2001) to develop draft Region 9 preliminary remediation goals (PRGs, USEPA 2002)) for direct exposure to TPH in ground water and soil. In addition, DAFs will be used to back-calculating draft subsurface soil Region 9 preliminary remediation goals (PRGs) for benzene, toluene, ethyl benzene, xylene (BTEX), methyl tert-butyl ether (MTBE), selected polynuclear aromatic hydrocarbons (PAHs), and TPH for protection of ground water.
