The professional engineers and scientists of THWA have developed and implemented an integrated approach for site characterization, fate and transport modeling, and risk analysis that documents and supports the natural attenuation alternative. This approach has been successfully used on many occasions to obtain regulatory approval for this passive method of remediation. The cornerstones of this approach include:
Maximized use of existing site information and careful planning of additional sampling to ensure that critical data for fate and transport analyses, risk assessments,. and remedial designs are collected in one characterization event.
Identification and cost-effectiveremoval of contaminant sources such as free product and highly contaminated soils through low-cost options such as skimmer pumps and bioventing techniques.
Use of proven fate and transport models such as Bioplume II@ and realistic worst-case input data to predict the maximumrates and extent of contaminant migration.
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If little or no risk exists, THWA prepares documentation for the regulatory agencies which supports the alternative of natural attenuation with long-term monitoring. If the potential for significant risk is established, THWA can assist in negotiations with regulators to develop reasonable clean-up standards and a remedial action plan to address risk reduction at the lowest possible cost. THWA can then provide design, construction, and operation of innovative and proven technologies which minimize capital and operating costs. THWA is interested in assisting our clients in implementing this approach at fuel spill sites.