TranslateProvect ERD-CH4 Injection and Performance Analysis:
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Confidential Site - Amsterdam, NY | September 2025 Bioremediation Event
Remediation Performance
The Provect ERD-CH4 injection successfully established anaerobic conditions across the target treatment zone (20-80' bgs). Post-injection monitoring (Oct 2025 - Jan 2026) demonstrates significant TCE reduction in the epicenter well (MW-4R: 96.6% reduction from 22,000 to 750 µg/L in 4 months). Downgradient wells show 61-78% TCE reductions, indicating sustained electron donor activity and contaminant biodegradation.
Geochemical Evolution
ORP values shifted from oxidizing conditions (pre-injection: +91 to +161 mV) to strongly reducing conditions by December (-180 to -274 mV), confirming enhanced reductive dechlorination. pH declined from neutral-alkaline (7.1-9.92) to slightly acidic (6.46-7.45), typical of organic carbon consumption during active bioremediation. This geochemical transition correlates directly with chlorinated solvent degradation.
Groundwater Elevation Impact
Rising water table (+2.35 to +8.02 ft) from October through January reflects seasonal recharge. Elevated groundwater spread the electron donor to a larger aquifer volume, facilitating contaminant contact and improving treatment efficacy. MW-4R's anomalous water level decline may indicate localized drawdown from injection activities; despite this, TCE reduction remained robust.
- MW-1R
- MW-4R
- MW-6
- MW-8
- MW-10
Water Table Rising: Favorable for Contaminant Spreading
Most wells show +2-8 ft elevation increase from Oct→Jan, indicating seasonal recharge. This rising water spreads the electron donor vertically and horizontally, improving contact with contaminant plume and enhancing bioremediation.
MW-4R Drawdown: Likely Injection-Related
MW-4R shows -6.55 ft decline Oct→Dec (injection epicenter), possibly from ERD injection pressure. Despite this localized drawdown, TCE reduction remained exceptional (96.6%), suggesting injection successfully mobilized the electron donor into the bedrock matrix.
✓ Injection Effectiveness
The Provect ERD-CH4 injection successfully established robust anaerobic conditions and achieved significant TCE remediation. MW-4R (epicenter) shows 96.6% TCE reduction in 4 months; downgradient wells show 61-78% reductions, demonstrating effective plume treatment with both localized and distal impacts.
✓ Sustained Bioremediation
Geochemical data (ORP -274 → -31 mV; pH trend) confirms reductive dechlorination remains active. Accumulation of dechlorination intermediates (cis-1,2-DCE) is expected and indicates pathway progress. Electron donor substrate appears to be depleting (ORP improving), suggesting normal lifecycle post-injection.
✓ Groundwater Elevation Facilitation
Rising water table (+2-8 ft) spread the electron donor vertically and horizontally. This natural seasonal recharge enhanced contaminant-donor contact and improved remediation efficacy across the entire treated zone.
⚠ Recommendations
- Continue quarterly sampling (Mar, Jun, Sep 2026) to track TCE trajectory and dechlorination intermediate fate
- Monitor ORP and pH trends—expect gradual increase/decrease as electron donor depletes
- If TCE stabilizes or rebounds, consider a second injection event to sustain anaerobic conditions
- Evaluate attainment of NYSDEC standard (5 µg/L TCE) by Q4 2026
