soil gas sampling with a helium leak detection shroud
TRANSCRIPT
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Soil Gas Sampling with a Helium Leak Detection Shroud
Bruce Godfrey & Stefan D’Angona
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In 1878…Curtis & Tompkins began as a laboratory analyzing wine samples for export…
The oldest Testing Lab in the US
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Introductiona. Leak Detection Options b. Helium Leak Detectionc. Leak Tracer System Designd. Use and experience
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Why Leak Check? Proof of Sample IntegrityLeaks result in sample dilution • Leaks in Train Fittings • Down Well Leaks
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Leak Testing Options• Liquid Tracer
• 2-Propanol (IPA) • Qualitative, interferes, raises RL’s
• Helium• Quantitative, no interference• “Pain in the neck”
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Helium Advantages• Frequently used for leak detection in
manufacturing• Inert, doesn’t interfere with target
compounds• Easily Measurable • Allows estimate of dilution
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The Sampling Train• Compression Fittings
• Assembled, cleaned, and disassembled
• Filters and Restrictors • Active Sites• QC Testing
• Blanks and Calibration Standards
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Soil Gas Sample Train
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Sampling Train Prep• Assembly: Critical Orifice• Leak Testing
• He Charge & leak detector check fittings• Vacuum Decay Testing
• Verify flow rate • Clean train: Nitrogen flow, 60C, 2hrs• Fill clean canister with air through train & test
canister contents to List and DL’s• Verify train performance with Calibration Standard
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Why Build & Rent He Shrouds?
Our clients asked us
Design using best available technology
Lab resources required
cleaning, maintenance, testing, validation
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Design Considerations• DTSC Guidance compliant• Size & Weight: Easy packaging and transport • Provide “leak tight” trains to field• Minimize number of field tubing connections• Real Time leak detection before sampling• Minimize false positives and negative target determinations• “Scalable” ….12 wells sampled in 8 hours• Low Cost • Simple to Use
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Helium Detectors
Flow Through and Diffusion Cell
Diffusion Detector inside shroud
Flow Thru Detector in purge line
Small, lightweight, portable, simple
Battery Powered
Quick, Accurate, Precise
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Helium Detectors
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MiniCan 1.4 Liter 6 Liter
Canister Fill Times
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Sample Size IssuesRepresentative Sample Size? Sample Homogeneity First Sniff ?
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Costs• Shroud equipment rental adds $70 per
sample for 8 wells• $235 for the first sample• Additional field labor costs• What circumstances justify extra costs for
a QC procedure?
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Shroud Components
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Off-No Flow
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Purge Flow
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Purge Test with In Line He Detector
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Sampling Flow
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Dual Depth Sampling Shroud
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Duplicate Sampling Shroud
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Duplicate Sampling• Serial Duplicates• Simultaneous Duplicates
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Acknowledgements• Blair Okuma and crew @ C&T• Loi Chau/Alfonso Ang: MACTEC• Ross Tinline: SVC Environmental• Heather Wollenburg/Robin Mock: ERRG• Jeff Schmidt: IRIS Environmental• Mark Blaisdel: ITSI