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Soil Vapor Extraction and Chemical Oxidation to Remediate Chlorinated Solvents in Fractured Crystalline Bedrock: Pilot Study Results and Lessons Learned
Author(s) -
Cho H. Jean,
Fiacco R. Joseph,
Daly Matthew H.
Publication year - 2002
Publication title -
remediation journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.762
H-Index - 27
eISSN - 1520-6831
pISSN - 1051-5658
DOI - 10.1002/rem.10022
Subject(s) - groundwater , soil vapor extraction , aquifer , environmental chemistry , extraction (chemistry) , bedrock , reagent , chemistry , geology , environmental remediation , contamination , geotechnical engineering , geomorphology , organic chemistry , ecology , biology
A pilot study was completed at a fractured crystalline bedrock site using a combination of soil vaporextraction (SVE) and in‐situ chemical oxidation (ISCO) with Fenton's Reagent.This system was designed to destroy 1,1,1‐trichloroethane (TCA) and its daughter products,1,1‐dichloroethene (DCE) and 1,1‐dichloroethane (DCA). Approximately 150 poundsof volatile organic compounds (VOCs) were oxidized in‐situ or removed from the aquifer as vaporduring the pilot study. Largely as a result of chemical oxidation, TCA concentrations in groundwater locatedwithin a local groundwater mound decreased by 69 to 95 percent. No significant rebound in VOC concentration wasobserved in these wells. Wells located outside of the groundwater mound showed less dramatic decreases in VOCconcentration, and the data show that vapor stripping and short‐term groundwater migration following theoxidant injection were the key processes at these wells. Although the porosity of the aquifer at the site is onthe order of 2 percent or less, the pilot study showed that SVE could be an effective remedial process infractured crystalline rock. © 2002 Wiley Periodicals, Inc.