O&G Superfund Site (ISOTEC Case Study 67) ISCO treatment program using activated persulfate - Kingston, NH

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ISOTEC was retained to implement an in-situ chemical oxidation (ISCO) treatment program at a former drum reconditioning superfund site in Kingston, New Hampshire to address impacted soil and groundwater.  Three separate treatment areas referred to as Area A, Area B and Area C were designated for treatment.  Primary contaminants of concern (COCs) at the site include benzene, toluene, ethylbenzene, total xylenes (BTEX), tetrachloroethene (PCE), trichloroethene (TCE), 1,1-dichloroethane (1,1-DCA) and 1,4 dioxane.  The ISCO remedy chosen for the site consisted of sodium hydroxide activated sodium persulfate (ALK-ASP) as the primary oxidant and ISOTEC’s patented modified Fenton’s reagent (MFR) as a secondary oxidant.  Historical VOC levels in groundwater have been as high as 20,000 micrograms per liter (ug/l) in Area B and were more recently measured to be as high as 7,600 ug/l in Area A prior to conducting the full-scale treatment program.  Historical levels of 1,4-Dioxane were as high as 200 ug/l in Area B and 32 ug/l in Area C.  Soil concentrations in discrete locations were found to be as high as 6,060 micrograms per kilogram (ug/kg) for toluene, 294,000 ug/kg for ethylbenzene and 780,000 ug/kg for total xylenes.

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