Print this pageSuccessful Use of In Situ Chemical Oxidation Technologies
for the Destruction of Chlorinated Solvents in Soils
and Multiple Aquifers in Southeastern Louisiana
Thomas Liebert1, William H. Schramm2, Thomas Glibota3, and Seth Washington4
1Reardon Environmental Inc., 4606 FM 1960 W., Ste. 342, Houston, Texas 77069
2Louisiana Department of Environmental Quality, P.O. Box 4314, Baton Rouge, Louisiana 70821
3Glibota Environmental Inc., 6145 Ivanhoe St., Englewood, Colorado 80111
4Hydrovac Inc., 408 Product Dr., Lake Charles, Louisiana 70615
ABSTRACT
Trichloroethane (TCA) and methylene chloride (MeCl) were released at two locations at a facility in southeastern Louisiana over two decades ago. The operating facility is densely occupied and removal of contaminated soils is not possible. A pump and treat system was operated to address contaminated groundwater. Concentrations of TCA and MeCl decreased significantly during the operation of the pump and treat system; however, degradation products of TCA including 1,1 dichloroethylene (DCE) up to 2 milligrams per liter (mg/l) and vinyl chloride (VC) up to 0.012 mg/l persisted in the groundwater at concentrations that exceed the Louisiana Department of Environmental Quality (LDEQ) Risk Evaluation Corrective Action Program (RECAP) standards developed for the site.
Corrective action alternatives were evaluated including air sparge enhanced with ozone, electrical resistance heating and in situ chemical oxidation (ISCO) with ISCO chosen as the preferred alternative for both soil and groundwater.
Geology and geochemistry were evaluated and an injection program was designed and implemented including Fenton’s Reagent for soil at each source location and pH activated sodium persulfate for groundwater into a total of one hundred injection points completed in three separate water bearing zones along the plume axes.
Data show reduction of soil contaminants to below the RECAP standards for residential and/or industrial facilities. Contaminant concentrations in three separate water bearing zones were reduced, residual treatment is ongoing and appropriate RECAP standards appear achievable.
This paper includes the site investigation and remediation history, basis for selection of ISCO, limiting factors for system
design, ISCO application program, and performance evaluation.
Liebert, T., W. H. Schramm, T. Glibota, and S. Washington, 2009, Successful use of in situ chemical oxidation technologies for
the destruction of chlorinated solvents in soils and multiple aquifers in southeastern Louisiana: Gulf Coast Association of Geological Societies
Transactions, v. 59, p. 443-462.
AAPG Search and Discover Article #90093 © 2009 GCAGS 59th Annual Meeting, Shreveport, Louisiana