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    APPLYING MULTIPLE LINES OFEVIDENCE TO PETROLEUM VAPOR

    INTRUSION INVESTIGATIONS

    Jerry Wickham

    Alameda County EnvironmentalHealth

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    From USEPA OUST 2011

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    Methane Added to Profile

    From USEPA OUST 2011 (modified to include methane)

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    Methane

    Generated by Hydrocarbon Decomposition

    Increase Soil Gas Volumes and Pressures

    Aerobically Degraded along with TPH Causes Additional Oxygen Demand

    Likely to Be More Significant at Releases with

    High Ethanol Content (USEPA 2011)

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    Soil Gas Profiles

    From API, Publication 4741, 2005

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    Soil Gas Profiles

    From API, Publication 4741, 2005

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    Restaurant

    Motel

    Convenience

    Store

    FormerTank Pit

    Product

    Line

    Trenches

    Planned

    Building

    Expansion

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    Basics of Conceptual Site Model (CSM)

    Source

    Pathway

    Receptor

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    Former

    Tank Pit

    Product

    Line

    TrenchesPlanned

    Building

    Expansion

    Groundwater to

    Indoor Air Soil to Indoor Air

    Preferential

    Pathways

    Pathways

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    Former

    Tank Pit

    Product

    Line

    TrenchesPlanned

    Building

    Expansion

    Current - Convenience

    Store Current Adjacent

    Buildings

    Future - Planned Slab

    on Grade BuildingExpansion for

    Convenience Store

    Potential Receptors

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    Multiple Lines of Evidence

    Site History

    Site Geology and Hydrogeology

    Proximity of Source to Receptor

    Groundwater Data

    Soil Data

    Soil Vapor Data

    Sub-Slab Vapor Data

    Spatial and Temporal Variability of Data

    Building Configuration

    Indoor Air Data

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    When Should ESLs for Groundwater to

    Indoor Air Not Be Used

    Non-Aqueous Phase Liquid

    Shallow Soil Sources

    Direct Building Contact Preferential Pathways

    Buildings with Significant Openings to the

    Subsurface

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    From Proposed State Water Resources Control Board LowThreat Closure Policy (July 2011)

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    Multiple Lines of Evidence

    Site History

    Site Geology and Hydrogeology

    Proximity of Source to Receptor

    Groundwater Data

    Soil Data

    Soil Vapor Data

    Sub-Slab Vapor Data

    Spatial and Temporal Variability of Data

    Building Configuration

    Indoor Air Data

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    Site Plan

    Building

    BuildingExpansion

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    Soil Samples SB6

    Boring Depth (fbg) TPHg (mg/kg) Benzene (mg/kg)

    SB6 3.0

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    Soil Sample VP1

    Boring Depth (fbg) TPHg (mg/kg) Benzene (mg/kg)

    SB6 4.0 100 1.2

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    From Proposed State Water Resources Control Board LowThreat Closure Policy (July 2011)

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    Low-Threat Criteria Benzene

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    Multiple Lines of Evidence

    Site History

    Site Geology and Hydrogeology

    Proximity of Source to Receptor

    Groundwater Data

    Soil Data

    Soil Vapor Data

    Sub-Slab Vapor Data

    Spatial and Temporal Variability of Data

    Building Configuration

    Indoor Air Data

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    Benzene in Soil Vapor g/m3

    Building

    Building

    Expansion

    23,000

    960,000

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    TPHg in Soil Vapor g/m3

    Building

    Building

    Expansion

    130,000,000

    120,000,000

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    Soil Vapor Sampling Results

    Units SB6 SB8 VP1

    Benzene g/m3

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    Benzene in Soil Vapor g/m3

    Building

    Building

    Expansion

    23,000

    960,000

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    Risk Management Decision to Excavate

    Source Removal

    Provided Minimum Distance of 7 Feet for

    Bioattenuation of Petroleum Vapors

    Removed Uncertainty Regarding Shallow

    Sources and Preferential Pathways

    Sub-slab and Soil Vapor Probes Installed to

    Confirm Effectiveness

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    Conclusions

    Look and you will find it what is unsought

    will go undetected..Sophocles

    Using Multiple Lines of Evidence Leads to

    Better Decisions

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    Questions

    Jerry Wickham

    Alameda County Environmental Health

    [email protected]


Vapor Intrusion Technical Support Document Intrusion Technical Support Document • August 2010 Minnesota Pollution Control Agency 2 Vapor Intrusion Technical Support Document •

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FET Seminar Wisconsin’s Vapor Intrusion Guidancednr.wi.gov/topic/Brownfields/documents/vapor/part2.pdfFET Seminar Wisconsin’s Vapor Intrusion Guidance Part 2 DNR’s Vapor Intrusion

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EPA Vapor Intrusion Workshop - IAVI

Vapor Intrusion Mitigation in Construction of New ... · Vapor Intrusion Mitigation in Construction ENVIRONMENTAL RESTORATION. of New Buildings Fact Sheet. Introduction. Vapor intrusion

Jerry's Professional Cleaners Vapor Intrusion Site

Sampling and Analysis in Vapor Intrusion Investigationss3.amazonaws.com/ebcne-web-content/fileadmin/pres/5-22-07_Reze… · Sampling and Analysis in Vapor Intrusion Investigations

VAPOR INTRUSION MITIGATION ADVISORY

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RAB Vapor Intrusion Mitigation

THE VAPOR INTRUSION PATHWAY DANIEL G. GREENE, CPG - Dan...VAPOR INTRUSION PATHWAY •Vapor intrusion is not soil, groundwater, or a contaminant compound. •Vapor intrusion is an exposure

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Brownfields Technology Primer: Vapor Intrusion ... Vapor Intrusion Considerations...BROWNFIELDS TECHNOLOGY PRIMER VAPOR INTRUSION CONSIDERATIONS FOR REDEVELOPMENT i Notice and Disclaimer

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Vapor Intrusion Technical Guidance

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