Executive Summary
When a remediation contractor needed a 3-month pilot soil vapor extraction (SVE) system within 2,000 feet of a public school in the South Coast AQMD, they faced stringent oversight for VOC decontamination. Target contaminants: BTEX, TCE, and PCE.
Zero detectable emissions were required under SCAQMD Rule 1166 (Volatile Organic Compound Emissions from Decontamination of Soil) and EPA SVE Guidelines.
Envent’s pre-permitted SVE trailer was on site the next day, achieving non-detect stack levels with full data logging. The pilot proved the system, paving the way for permanent installation.
Project At A Glance
- Location: South Coast AQMD, California
- Challenge: SVE Pilot for BTEX/TCE/PCE Near School (3 Months)
- Solution: Pre-Permitted SVE Trailer with Carbon Scrubbers
- Outcome: Non-Detect Emissions, 100% Rule 1166 Compliance, Permanent System Approved
The Challenge: SVE Pilot Near Sensitive Receptors
The project involved excavating and handling VOC-contaminated soil near a school, triggering SCAQMD Rule 1166 requirements for prior notification, mitigation plans, and continuous monitoring to prevent fugitive emissions. EPA SVE Technology Reference Handbook emphasizes vapor treatment for extracted gases exceeding air emission limits, with pilot testing essential for full-scale design.
Key Constraints Regulatory Compliance Rule 1166 mandates approved mitigation plans for soil decontamination, including VOC monitoring with calibrated analyzers (e.g., PID/FID calibrated to hexane factor) and no operations without SCAQMD approval. EPA Soil Vapor Extraction Resource Guide requires secondary vapor treatment if concentrations exceed local limits, with school proximity heightening odor/nuisance risks under Rule 402.
Operational Demands Prove system sizing and flow for permanent installation; handle variable VOC loads from BTEX, TCE, PCE without breakthrough.
Emission Risks Uncontrolled vapors could exceed 500 ppmv, triggering NOVs and halting work; pilot must generate data for SCAQMD site-specific plans.
Official Resources
- SCAQMD Rule 1166 – VOC Emissions from Soil Decontamination – Notification, monitoring, and mitigation for contaminated soil handling.
- EPA Soil Vapor Extraction (SVE) Handbook – Design, enhancement, and vapor treatment guidelines for VOC remediation.
Envent’s Pre-Permitted SVE Pilot Solution
Envent maintains pre-permitted, self-contained SVE trailers registered under SCAQMD’s Portable Equipment Registration Program (PERP) and Rule 1166 variance. We delivered one complete trailer the next day:
Treatment Process & VOC Destruction Details Vapor Capture & Routing Subsurface vapors extracted via high-vacuum blower (up to 500 scfm), routed through slotted wells to the trailer’s manifold for uniform treatment.
Carbon Scrubbing Efficiency Lead/lag vapor-phase activated carbon vessels (2,000 lb each) with multi-port sampling achieved non-detect for BTEX/TCE/PCE at stack, calibrated per EPA Method 25A equivalents and Rule 1166 hexane factor. 14′ vent stack ensured dispersion above school receptors.
Compliance Integration Chart recorder logged continuous VOC concentrations; daily inlet/midpoint/outlet samples verified <500 ppmv. Power via 480V tie-in; throttled blower optimized flow without breakthrough.
The system ran 24/7 for 3 months with Envent operators. For SVE applications, explore Envent’s soil vapor extraction services.
Proven Benefits: Pilot Success, Zero Risk
Envent’s solution proved system viability, enabling permanent installation:
| Benefit | Project Impact |
|---|---|
| Emission Control | Non-detect stack for BTEX/TCE/PCE; zero fugitive releases |
| Regulatory Assurance | 100% Rule 1166 & EPA SVE Guidelines compliant; full data for SCAQMD approval |
| School Proximity Safety | Zero odors/complaints; dispersion modeling confirmed <1 ppb at receptors |
| Pilot Validation | Proved sizing/flow for permanent system; saved $100K+ in redesign |
| Operational Efficiency | 500 scfm continuous; 3-month uptime with no downtime |
This project exemplifies Envent’s SVE & vapor mitigation expertise in sensitive areas.
Need an SVE Pilot Near Schools or Communities? Get your Free Rule 1166 & EPA SVE Compliance Review & Quote today. Call Envent’s California Team at 888-997-9465 or email [email protected] — pre-permitted trailers ready across SCAQMD.
