Frequently Asked Questions – environmental protection
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In Situ Remediation
In situ (“in place”) remediation refers to the cleanup of contaminated soils and groundwater without removing contaminated media from the subsurface, typically through the use of physical and/or chemical processes.
Geotrade has considerable experience and expertise in employing numerous in situ technologies, including:
- biostimulation through the addition of chemical additives to enhance or stimulate natural microbial processes
– vapour extraction to remove vapour-phase contaminants in the subsurface by volatilization of volatile contaminants for subsequent recovery
– bioremediation via injection of highly oxygenated water or oxygenated gases into the subsurface
– groundwater flushing via injection and recovery of surfactants
– construction of hydraulic barriers to mitigate migration of soluble contaminants
– pumping – extraction systems for recovery of immiscible and dissolved‑phase contaminants
In practice, the successful application of an in situ remedial is dependent upon the innovative combination of several in situ remedial technologies. The selection, design, and operation of such systems can only be achieved through the collaborative efforts of experienced and knowledgeable engineering and scientific experts.
Geotrade’s multi-disciplinary approach has resulted in the successful design and operation of numerous in situ remedial systems in locations ranging from well‑developed urban areas to un‑serviced rural and remote areas.
Unlike in-situ approaches, ex-situ remediation involves the removal of contaminated media, either for off-site disposal or for on‑site treatment and subsequent return to the subsurface.
Our team of geoscience, engineering and environmental specialists have considerable experience and routinely employ a variety of ex-situ methods, the most common being:
– excavation and off-site disposal of impacted soils (with on-site segregation/management of contaminated soils from uncontaminated soils)
– the construction and operation of biopiles (both aboveground and subterranean)
– recovery and treatment (if required) of impacted groundwater