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NATIONAL RAILWAY
Brandon, Manitoba
CHALLENGE: A national railway required a cost effective plan for the long-term management of a liquid phase hydrocarbon (LPH) plume beneath their rail yard.
SOLUTION: Work by previous consultants included the installation of a LPH recovery system. Morrow was contracted to manage this system as well as to investigate the potential for monitored natural attenuation as a strategy for the dissolved plume management. Morrow continued to maintain and operate the LPH recovery system located at the source of the dissolved hydrocarbon plume.
Groundwater contaminant transport modeling was used to predict down-gradient migration of dissolved hydrocarbons toward a major river. A program of data collection to confirm that natural attenuation was occurring was undertaken to assess conditions in the dissolved plume through the analysis of various geo-chemical indicators. Such a program allows for determination and documentation of plume status and serves to indicate if biodegradation of the plume is occurring.
After two years of monitoring for natural attenuation, the dissolved hydrocarbon plume has been observed to be stationary and has not impacted the water quality in the nearby river.
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