U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

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U.S. EPA Technology Innovation and Field Services Division

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Holm, J., N. Ploug, A. Dzafic, E. Remstam, P. Anderson, A. Bank, and H. Lindvall.
NORDROCS 2018: 7th Joint Nordic Meeting on Remediation of Contaminated Sites: Poster.

The Faergaren 3 site in Kristianstad (Skane, Sweden) formerly housed a dye works and dry cleaner whose operational releases generated heavy site contamination, mainly PCE. The site, which sits atop one the most valuable groundwater resources in Scandinavia, was prioritized for remediation funded by the Swedish EPA and headed by Kristianstad Kommun. The remedy comprised a combination of removing the top 2.5 meters of soil on site and implementing thermal treatment from 2.5 m bgs to 20 m bgs inside a 900 m2 area. At the end of excavation, an extraction layer was installed from 2-2.5 m bgs to be used for thermal remediation. The remediation goal is to achieve an average concentration of chlorinated solvents of 1 mg/kg. The geology at the site is a combination of clay, sand, and sandstone. Thermal remediation in the form of in situ thermal desorption (ISTD) was applied on the site using 92 heater elements combined with an extraction and treatment system for the vaporized contaminants. Contaminated vapors were extracted through the gravel pack along the installed heaters and subsequently through the installed extraction layer. ISTD operation commenced in September 2017, and verification sampling was conducted in January/February 2018. An estimated contaminant mass of 1,500 kg of chlorinated solvents was extracted over 4.5 months of operating time. The maximum extraction rate was ~100 kg/day. Temperature development and extracted mass was monitored online over the duration to help determine when verification samples should be performed. See illustrations at http://mirachl.com/thermal-pce-remediation-equipment-at-site-fargaren-being-installed/.

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