--> Successful Use of In Situ Chemical Oxidation Technologies for the Destruction of Chlorinated Solvents in Soils and Multiple Aquifers in Southeastern Louisiana, Thomas Liebert, William H. Schramm, Thomas Glibota, and Seth Washington, #90093 (2009)

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Successful 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.

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AAPG Search and Discover Article #90093 © 2009 GCAGS 59th Annual Meeting, Shreveport, Louisiana