Pompton Lakes 3-3-09 r3 (3)1

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Transcript of Pompton Lakes 3-3-09 r3 (3)1

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    ReviewofDuPontsVIRMWPPreparedbyAnthonyKaufman,PG

    Director

    arc

    3,

    2009

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    SituationSummary

    GroundwaterVOC

    plume

    extends

    offsite

    from

    DuPont

    PLW Createsriskofvaporintrusionpathwayintohomes

    DuPont isimplementinginvestigationandresponse

    program

    pursuant

    to

    NJDEP

    approved

    Vapor

    Interim

    RemedialMeasuresWorkPlan VIRMWP

    BoroughofPomptonLakesretainedEWMAtoconduct

    andthereby

    help

    to

    protect

    the

    interests

    of

    its

    residents.

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    Chemicalso Concern

    TCE(trichloroethene)

    Cleaningsolventanddegreaser

    PCE(tetrachloroethene)

    ean ngso ventan common ryc ean ngc em ca

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    GroundwaterPlumeExtends

    from

    PLW

    south

    to

    Pompton

    Lake

    Basedonlongtermmonitoring

    DocumentedwithCEA

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    GroundwaterCEA

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    DuPont sProgram

    UpdateCSM

    Delineate lume

    Offervapormitigationsystemstoallhomes

    Samplesubslabvaporsinbufferzone(EIA)

    Test,design,

    insta ,

    and

    maintain

    systems

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    WorkPlanReviewGuidanceDocuments

    ChemicalsofConcern

    PlumeExtent

    SiteSpecificComparisonLevels

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    roun wa er

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    roun wa er

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    ComparisonLevelsSite-SpecificSub-Slab Soil

    NJDEPScreenin

    Site SpecificSub-slab Soil

    NJDEPScreenin

    COCs

    Gas Comparison

    Level (ug/ m3)

    Criteria

    (ug/m3)

    Gas Comparison

    Level (PPBV)

    Criteria

    (PPBV)

    Carbon Tet 13 31 2 5

    1,1-DCA 5,000 26,000 1,200 6,300

    1,2-DCA 8 20 2 5

    1,1-DCE 2,000 11,000 500 2,800

    1,2-DCE ( cis ) 350 1,800 88 460

    -, ,

    PCE 16 34 2 5

    , , - , , , ,

    TCE 11 27 2 5

    Vinyl Chloride 5 13 2 5

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    WorkPlanReview cont.

    SystemDesign,

    Installation,

    and

    Commissioning

    SystemMaintenance

    SamplingMethodsandProcedures

    ReportingDataAnalysesandValidation

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    CurrentPVMA&EIA

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    EWMAFindings

    DuPontsprogram

    adequate

    and

    consistent

    withstandardsofpractice

    Mitigationsystemswillbeeffective

    mitigationsystem

    e

    o

    averecommen a ons

    o

    mproveconfidencelevels

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    EWMAFindings

    Recommendations

    to

    improve

    confidence

    levels

    Additionalwellstodefineandmonitorplume

    ReviewalldatafromEIAandworstcasesamplingtimes

    to

    avoid

    islands

    of

    NFA

    and

    confirm

    extent

    Clarifydecision/optionsinEIA

    Addresshi hwatertableandlocationsnotsuitable

    fordepressurization

    systems

    Confirmsystemseffectivenessonongoingbasis

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    EWMAFindings

    Recommendations

    to

    improve

    confidence

    levels

    Decommissionsystemsonlywhenareawidecon onsaresu a ean a erapproval

    Considerallstructuresinarea

    Prioritizeresponse

    or

    RALs

    Followupdatavalidationresults

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    ProposedIndependentSampling

    Obtain

    sp it/dup icate

    indoor

    air

    and

    sub

    slabsamples

    Obtainindependentsubslabsamples

    Participateinpredesignvisit

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    ues ons