Remediation
ETG personnel have developed remedial actions for a wide range of facility types and contaminants. Contaminants in both soil and groundwater have included chlorinated solvents (e.g., tetrachloroethene [PCE], trichloroethene [TCE], and trichloroethane [TCA]), arsenic, petroleum hydrocarbons, metals, nitrates, polynuclear aromatic hydrocarbons (PAHs), chlorinated phenolic compounds, polychlorinated biphenyls (PCBs), and dioxins.
ETG personnel have developed remedial programs with groundwater extraction, air sparging, SVE (including off-gas abatement), in-situ and ex-situ bioremediation, engineering and institutional controls, and other remedial methods. ETG has also successfully implemented and operated the following types of groundwater remedial systems: bio-augmentation, enhanced bioremediation involving injection of complex carbon substrate nutrients to accelerate reductive dechlorination, free-phase product recovery using total fluid, product only recovery, recovery trenches, in-well absorptive media, enhanced groundwater oxidation systems using hydrogen peroxide injections, and VOC separation (air sparging and activated carbon systems). Wastewater disposal methods applied by ETG include oil/water separation, enhanced evaporative concentration with proper disposal of remaining solids, injection wells, and the use of publicly operated treatment works (with associated permitting) both with and without pretreatment. ETG personnel have also provided maintenance of these facilities and instructed clients in their maintenance requirements.
Remedial methodologies used by ETG for soil remediation have included: excavation and disposal at municipal, industrial or hazardous waste landfill and hazardous waste incineration; land farming; in-situ and ex-situ bioremediation; in-situ SVE; and SVE treatment cells.
EXAMPLE PROJECTS BY GEOGRAPHIC AREA