Confidential Site (ISOTEC Case Study 60) Injection of calcium polysulfide for in-situ treatment of heavy metals (hexavalent chrome)

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ISOTEC was retained to implement a calcium polysulfide (CAPS) treatment program at a confidential site in northern New Jersey to address heavy metal impacted soils. The target contaminant of concern (COC) was hexavalent chromium [Cr (VI)]. Concentrations of Cr (VI) in soils varied from less than 240 milligrams per kilogram (mg/kg) to as high as 1,770 mg/kg. Average Cr (VI) concentration of 100 mg/kg was assumed in the design of the in‐situ chemical reduction (ISCR) treatment program.

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