ISOTEC Case Study No. 60 ISCR TREATMENT PROGRAM: IN-SITU HEAVY METAL TREATMENT (HEXAVALENT CHROMIUM) Confidential Site INTRODUCTION 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. SITE BACKGROUND/GEOLOGY Past business operations at the site have resulted in soil impacts with Cr (VI). The site is currently occupied

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