Featured Project: 15-Year Multi-Phase Extraction & Vapor Destruction – MTBE Plume, Northern California Refinery
Since 2008, Envent has operated the longest continuously running mobile remediation system in the Bay Area: a 450 SCFM Liquid Ring DVT + EMTOS 2000 dual-phase extraction (DPE) and vapor destruction system preventing MTBE-contaminated groundwater from reaching San Francisco Bay.
The Challenge
- Large MTBE plume from historic underground transfer line leak
- Hydraulic containment required 24/7 to protect the Bay
- Must treat both groundwater (NPDES discharge) and soil vapor (BAAQMD Reg 8-47)
- 99.9% destruction of gasoline-range VOCs including MTBE
- Zero downtime allowed – system must run 365 days/year
Envent’s Proven Long-Term Solution
Envent designed and has operated this fully integrated, permitted system for over 15 years:
| Component | Specification |
|---|---|
| High-Vacuum Liquid Ring Blower | 450 SCFM @ 26″ HgV – simultaneous liquid + vapor |
| Knockout Tank + Moisture Separator | Separates phases for treatment |
| EMTOS 2000 Thermal Oxidizer | >99.9% DRE of MTBE, BTEX, TPH-g |
| Existing On-Site Water Treatment | Polishes groundwater to NPDES limits |
| Full Telemetry & Redundancy | Auto-switchover blowers + remote monitoring |
Performance
- Continuous operation since 2008 – zero unscheduled downtime
- Stack samples consistently non-detect for MTBE & BTEX
- Monthly/quarterly reporting to BAAQMD Reg 8-47 & RWQCB
- Annual source tests confirm >99.9% DRE
Proven Results – 15+ Years of Compliance
| Benefit | Delivered Outcome |
|---|---|
| Environmental Protection | 100% hydraulic containment – no migration to Bay |
| Regulatory Compliance | Full BAAQMD Reg 8-47, NPDES, Title V compliance |
| System Reliability | 15+ years continuous operation |
| Cost Efficiency | Mobile system avoids $3M+ permanent plant |
| Mass Removal | Millions of pounds of MTBE & TPH destroyed |
This system remains the gold standard for long-term dual-phase extraction and vapor destruction in the Bay Area.
Need MTBE, TPH-g, or gasoline plume remediation in California? Get your Free BAAQMD Reg 8-47 & NPDES-Compliant System Design today. Call Envent at 888-997-9465 or email [email protected] — proven since 2008.
