ORIN successfully treated chlorinated solvent contaminated groundwater utilizing insitu chemical injection. ORIN’s approach was to incorporate a barrier wall to stop migration off site, as well as hot spot treatment around MW-14. Approximately forty-eight injection points were designated as BAM Ultra points, while twenty injection points were designated as ABC+ points. The majority of injection points were designated for the barrier wall while a small portion targeted monitoring wells.
The Challenge
The site faced multiple contamination challenges:
- Multiple Chlorinated Compounds:
- 1,1-DCE at 19.5 μg/L
- Cis-1,2-DCE at 2,570 μg/L
- TCE at 1,631.9 μg/L
- Vinyl Chloride at 257.5 μg/L
- Complex geology consisting of silty to sandy clay
- Risk of off-site contaminant migration
The Solution: Dual Strategy Approach
The remediation team implemented an innovative treatment strategy combining:
- Barrier Wall Installation:
- Prevented off-site contaminant migration
- Utilized majority of injection points
- Strategic placement for maximum effectiveness
- Hot Spot Treatment:
- Targeted treatment around monitoring well MW-14
- Used specialized chemical injection
- Combined two treatment solutions:
- 48 BAM Ultra injection points
- 20 ABC+ injection points
Treatment Chemistry
The project utilized two complementary treatment compounds:
- BAM™ technology for primary treatment
- ABC+ for enhanced degradation
- Strategic placement of both compounds for optimal results
Remarkable Results
After just three months, the treatment achieved exceptional results:
- Over 96% reduction in all monitored contaminants
- MW-14 showed non-detect levels for all contaminants
- Successful containment of off-site migration
- Results confirmed through post-treatment sampling
Key Success Factors
Several elements contributed to the project’s outstanding success:
- Strategic combination of barrier wall and hot spot treatment
- Precise placement of injection points
- Use of complementary treatment compounds
- Comprehensive monitoring and sampling program
Long-Term Implications
This project demonstrates:
- The effectiveness of combined treatment approaches
- Rapid achievement of remediation goals
- Potential for complete contaminant elimination
- Success of strategic barrier wall placement
This case study provides a valuable template for similar chlorinated solvent remediation projects, particularly in urban industrial settings.
