Groundwater Contaminant Concentration Trends At Rocky Mountain Arsenal, White Paper.
SHELL OIL CO DENVER CO
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The groundwater monitoring history at the Rocky Mountain Arsenal RMA has provided the opportunity to evaluate trends in contaminant concentrations at internal and boundary groundwater containment systems. The primary purpose of this assessment was to help optimize long-term operation of internal and boundary containment systems by providing some insight into long-term trends in contaminant concentrations. The results of this study demonstrate the total organic contaminant concentrations approaching the RMA boundaries are decreasing overall. Along several plume flowpaths, steep concentration gradients are observed spatially for several organic contaminants. Concentrations decrease to below Offpost Preliminary Remediation Goals or analytical reporting limits upgradient of the Basin A-Neck area and the RMA boundaries. Although determining the mechanisms responsible for these decreases is not within the scope of this report, they undoubtedly include a combination of cessation of manufacturing disposal activities, implementation of IRAs and other site- specific management activities, and natural attenuation mechanisms. jg p8
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