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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