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8/7/2019 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
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