AST HAS BEEN PERFORMING GROUNDWATER AND SOIL IN-SITU REMEDIATIONRefers to the process of treating contaminated sites or areas by applying various techniques directly to the location of the... PROJECTS SINCE OUR INCEPTION IN 1993. In the early 2000s, driven by the environmental marketplace, AST began injecting amendments on a small scale to address petroleum and chlorinated impacts in saturated soil and groundwater. In 2005, we took it to the next level, upgrading one of our mixing and injection systems to install 200,000 lbs of micro-scale ZVIZero-valent iron (ZVI) is a type of iron that has a high reactivity due to its zero oxidation state. ZVI... and 30,000 gallons of an organic electron donorAn electron donor is a substance or molecule that donates one or more electrons to another substance in a chemical... to address chlorinated solvent groundwater impacts.
Since then, AST has strived for continual improvement in our understanding of both in-situ biotic and abiotic processes, development of mixing and injection systems capable of handling wide ranges of amendments from high solids slurries (>30%) to corrosive oxidants, and advances in methods, procedures, and techniques that have been proven to be highly effective at managing back-diffusion in varied geologic settings.
While most in-situ projects focus on groundwater cleanup, AST has also developed effective techniques to reduce total contaminant mass from saturated soil. So whether your site requires groundwater remediation or total mass reduction (soil + groundwater), AST and our experienced project management team can work with you to develop a time and cost effective remedy.
As we look to the future, AST will continue to be innovative while focusing on qualities that are important to our clients -- safe, effective, and efficient implementation of projects that achieve the established remedial site goals.
Bedrock Injection
AST’s custom bedrock injection unit and straddle packer assemblies are capable of isolating and injecting into any competent fracture network.
Overburden Injection
AST has perfected the science and implementation of both simple and complex overburden injection programs.
Pre-drill
Methodology
AST has developed an injection approach that utilizes traditional drilling techniques to reach lithologies and/or depths not accessible via direct-push injection alone.
Soil MixingSoil mixing is an effective in-situ method to introduce a reagent using excavation and specialized mixing equipment, which alters the...
(Stabilization and Solidifcation)
When site conditions warrant, AST can directly mix reagents into the subsurface to either remediate or stabilize contaminated soil.
Permeable Reactive Barriers (PRBs)
AST has completed many PRBA permeable reactive barrier (PRB) is a passive, in-situ remediation technology used to treat contaminated groundwater. PRBs are constructed using... projects via direct-push injection and conventional continuous trench application to limit groundwater mass flux.
