When Standard DPT Isn’t Enough
In most overburden sites, DPT is sufficient to reach treatment zones. But in some geologic conditions—like hardpan, chert, compacted fill, rubble, or partially weathered rock—standard methods fall short.
That’s where GeoTAP comes in.
How GeoTAP Works
AST developed the GeoTAP approach through field collaboration to enable precise injection in tough lithologies. Here’s how it works:
- Pre-drill boreholes using sonic, air rotary, or hollow-stem auger methods
- Backfill boreholes with hydrated bentonite chips or pellets to seal the bore wall
- Use DPT to push through the bentonite seal to reach target injection intervals
- Inject remedial chemistry (e.g., BOS 100®, CAT 100®, etc.) without compromising bore integrity
This technique has been successfully deployed on over 30 projects across the U.S., including sites where injection depths exceed 180 feet below ground surface.
Why GeoTAP Works
- Enables access where traditional DPT is blocked
- Maintains seal integrity for accurate reagent placement
- Supports deep injection in both natural and anthropogenic obstructions
- Integrates with AST’s in-situ systems for seamless field implementation
- Reduces risk and delays in high-stakes remediation projects
If your site has impenetrable zones, GeoTAP opens the path—literally—to cleaner outcomes and project success.
