Poster: High-Resolution Characterization in Support of In Situ Solidification/Stabilization Design
Millennium Hall
High-resolution Tar Green Optical Screening Tool (TarGOST®) and electrical conductivity (EC) technologies, in combination with soil and groundwater sampling, were used to aid in the identification of chemicals of concern (COC) source areas and plume definition at a site in Illinois. The EVS© methodology allowed for quick and efficient import and analysis of a variety of data, including site geology, soil and/or groundwater contamination data, TarGOST® data, EC data and more. The combination of conventional and innovative presentation techniques provided additional insight into contaminant fate and transport in a complex hydrogeologic system, providing the basis for an accurate, defensible CSM that supports evaluation and design of the selected ISS remedy.
Poster: Installing A Permeable Reactive Barrier During MGP Site Remediation to Prevent Off-Site Contamination
Millennium Hall
Permeable reactive barriers (PRBs) have been installed downgradient at five MGP sites since 1994 to treat dissolved contaminants before they could migrate off-site. Since this wall is not permeable, it could alter the groundwater flow pattern across a site, including a mounted groundwater at the upgradient side of the wall. To solve for this, a PRB at the upgradient of a remediated area was evaluated, designed and implemented. The performance of the installed PRB was evaluated based on groundwater monitoring and the results showed that chemicals were removed by the PRB. Since the PRB installation, results have shown groundwater monitoring wells have been treated effectively.
Adam Chen
Project Manager
Poster: In Situ Immobilization of Coal-Tar and Mobile DNAPL at MGP Sites Using Low-Temperature Thermochemical Solidification Technology
Millennium Hall
The presence of mobile or potentially mobile coal tar in the subsurface at many MGP sites can become a source of groundwater contamination and ultimately a serious environmental challenge and risk to human and ecological receptors. Coal tar/dense nonaqueous phase liquid (DNAPL) is comprised of mostly insoluble aromatic compounds such as pyrene, chrysene and benzo(a) pyrene, which are solubilized in a fraction of light end hydrocarbon compounds such as benzene (BTEX) and naphthalene. With low-temperature thermochemical solidification (TCS) technology, the lighter fraction of the DNAPL can be strategically removed at approximately 100 degrees Celsius and turn to coal tar into a solidified mass.
Vipul J. Srivastava
Business Development Manager
Poster: Dose Response Studies Prior to Field Tests of ISCO/ISS Treatment: Effectiveness of Using Cement-Persulfate Mixtures in MGP Soils
Millennium Hall
Combined ISCO/ISS technology builds on synergies of unit processes and most individual remedial technologies have strengths and limitations. Combined remedies, which apply two or more technologies, achieve overall greater efficiencies than that of each stand-alone technology. In preparation for field pilot studies, bench-studies were conducted on 10 different MGP soils contaminated with polynuclear aromatic hydrocarbons and total petroleum hydrocarbons (PAHs) to compare the effectiveness of combining in situ chemical oxidation (ISCO) with in situ stabilization/solidification (ISS) as stand-alone treatments. The results showed that chemical oxidation removed a significant portion of PAHs. Combined oxidation and stabilization treatments reduced PAH leachability far more than stabilization treatments alone using the same dose.
Vipul J. Srivastava
Business Development Manager
