Abstract
Abstract : Tungsten was detected in soil and groundwater beneath the Bravo Small Arms Range (SAR) at Camp Edwards, Massachusetts. This discovery prompted additional studies to assess tungsten's fate-and-transport. Installation of drive points and groundwater monitoring wells at three SARs [Bravo (B), Charlie (C), and South East/South West] indicate that groundwater contamination is restricted to B Range. Although tungsten is still present in groundwater monitoring well MW-72S at Bravo Range, concentrations have dropped significantly since the removal of soil and have stabilized at a less than 2 microng/L concentration. Soil remediation consisted of removal of all berm soil that contained tungsten with a level greater than 150 mg/kg. Similarly, shallow lysimeters installed at B, C, and India Ranges also indicate a decline in tungsten levels post-soil removal. Deep lysimeters at B range, installed after soil removal activity, indicate that tungsten is present in pore water at least 7.6 meters below ground surface.
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