ISGS® remediation technology utilizes a permanganate-based solution to geochemically stabilize dense non-aqueous phase liquids (DNAPL) in the aquifer.
Permanganate and other proprietary reagents are selected depending upon the particular characteristics of each location and custom mixed on site into an aqueous solution that can be injected into an aquifer either through existing wells or direct push technology. As the solution migrates through the treatment area it oxidizes contaminants yielding partial mass removal. The ISGS technology also reacts with contaminants in the treated area thereby coating NAPL surfaces with stable mineral precipitates that reduce mass flux.
When released into the environment, chlorinated solvents, coal tar, creosote, and heavy crude oil are frequently present as DNAPL and represent a long term secondary source of contamination. Physical removal or in situ remediation of DNAPL is not always practicable due to the depth of contamination, aquifer geology, the presence of physical surface structures, or other factors making hydraulic containment (e.g., long-term pump-and-treat) or in situ stabilization the only viable remedial action. The process of In Situ Stabilization prevents or slows harmful chemicals from contaminated soil, sediment and sludge, from leaching into the environment. The contaminants are chemically immobilized under ground making them less likely to be released into the environment.
This report summarizes field observations, analytical results for soil cores and "crust" analyses on soil cores collected approximately 60 days after treatment. In addition, it presents the data associated with the Variance requirements associated with the use of the material.