TRC was retained to address hydrocarbons that were inadvertently released from a natural gas processing facility in Wyoming. These constituents formed a light non-aqueous phase liquid (LNAPL) layer on the underlying groundwater, which flows through a complex network of fractured bedrock. Any remedial action needed to be implemented with limited access to plant facilities and without disrupting on-going operations. The remedial system would also need to withstand extremely hot and cold weather conditions.
Using existing hydrogeological information, TRC developed a detailed site conceptual model to understand the LNAPL transport behavior and identify optimal product recovery locations. A plan that limited disturbance of subsurface utilities and worked around existing operations was submitted to the state agency. Following approval from the Wyoming Department of Environmental Quality (WDEQ), TRC took advantage of existing monitoring wells to install solar-powered skimmers to recover the LNAPL.
TRC’s approach allowed the client to keep processing natural gas and generating revenue while remediation was performed. Additionally, the use of solar-powered skimmers was less costly than constructing a more elaborate recovery system. Since 2011, over 1,500 gallons of LNAPL have successfully been recovered while minimizing the project’s environmental footprint and strengthening the client’s proactive reputation and working relationship with the state agency. Additional benefits of this sustainable remediation strategy included:
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