SINCE 2005, AST’S SUCCESS IN REMEDIATING OVERBURDEN IMPACTS USING INJECTION TECHNIQUES CAN BE TRACED TO SEVERAL FACTORS: EXPERIENCED STAFF, CUSTOM INJECTION EQUIPMENT, SURGICAL INJECTION PLANS, FLEXIBLE AND INNOVATIVE IMPLEMENTATION METHODOLOGIES, AND SELECTING THE PROPER REMEDIATION CHEMISTRY.
The implementation methods vary with lithology, depth of impact(s), and reagents to be injected. AST has developed and continues to refine our tooling and injection procedures to ensure effective reagent distribution regardless of the depth or nature of the lithology. Our surgical injection plans are developed from the Quantitative High Resolution Conceptual Site Model using from the Remedial Design Characterization process.
AST’s injection systems are custom and built in-house with flexibility in mind. The electric systems are capable of mixing and injecting aqueous slurries with solids content >30% (w/w), chemical oxidizers and reducers, and emulsifications. Injection flow rates (and thereby injection tip exit velocities) can be varied from less than 5 gallons per minute (gpm) to 70 gpm to accommodate site-specific geologic and hydrogeologic conditions. As part of reagent emplacement, injection parameters recorded are combined with field quality control procedures to verify effective distribution within the formation for expedited removal of contaminant mass.