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PUBLIC HEALTH ASSESSMENT
NORTHWEST PIPE AND CASING COMPANY
CLACKAMAS, CLACKAMAS COUNTY, OREGON


APPENDIX B - PATHWAYS ANALYSES

TABLE 22. COMPLETED EXPOSURE PATHWAYS

PATHWAYNAME/ENVIRONMENTAL MEDIA
EXPOSURE PATHWAY ELEMENTS
TIME
SOURCEPOINT(S) OFEXPOSUREROUTE OFEXPOSUREEXPOSEDPOPULATION
Ambient andIn-door AirCoal tar vapors frompipe coating activities,coal tar pots, and wasteburn pile.Inside NWP&C buildings,outside near burning andwaste areas.InhalationFormer workersPast
SoilWaste in soil (PAH's,PCB's and otherorganics)Residential yards,
On-site at NWP&C
Ingestion
Inhalation
Residents near NWP&C,on-site trespassers,on-site property users:past truck drivers and hayworkers, potential fornearby workers duringremedial activities.Past
Present
Future
Groundwater-
Public Wells ofMilwaukie
UnidentifiedResidences, BusinessesIngestion
Inhalation
Skin Contact
Past municipal well usersPast
Future


TABLE 23. POTENTIAL EXPOSURE PATHWAYS

PATHWAYNAME/ENVIRONMENTAL MEDIAEXPOSURE PATHWAY ELEMENTSTIME
SOURCEPOINT OFEXPOSUREROUTE OFEXPOSUREEXPOSEDPOPULATION
Ambient AirCoal tar emissions
from NWP&C.
Town of Clackamas
Other nearby residential/
commercial areas.
InhalationResidentsPast
Soil GasNWP&C buried wastes &soil contaminationOn- or off-site nearNWP&CInhalationResidents, WorkersPast
Present
Future
SedimentRunoff carryingcontaminants fromNWP&C.Drainage Ditches,
Deer Creek,
Flood areas south ofNWP&C.
Ingestion
Skin Contact
Ditch/Creek users,

Residents using area southof NWP&C near CampWithycombe.

Past
Present
Future
Surface waterRunoff carryingcontaminants fromNWP&C.Drainage Ditches,
Deer Creek,
Flood areas south ofNWP&C.
Ingestion

Skin Contact

Ditch/Creek users,

Residents using area southof NWP&C near CampWithycombe.

Past
Present
Future
Shallow Groundwater-
private wells
NWP&C buried wastes &soil contaminationPossibly privatewells downgradientof the site.Ingestion
Skin Contact
Any well users drawingfrom shallow groundwaterdowngradient of sitePast
Present
Future
DeepGroundwater-private wellsUnidentifiedResidencesIngestion
Skin Contact
Private well usersPast
Present
Future
Food Chain/
Fish & animal
Surface runoff, sediment.Deer CreekIngestionCreek fish eatersPast
Present
Future
Food Chain/Fruits &VegetablesWaste in Soil,
Atmospheric deposition of contaminants,
Irrigating withcontaminated surface wateror groundwater.
On-site berry bushes,local gardensIngestionResidents eating on-siteberries or gardening offsite.Past
Present
Future


TABLE 24 - ESTIMATED POPULATION FOR COMPLETED AND POTENTIALEXPOSURE PATHWAYS

Exposed Populations and Potentially ExposedPopulationsAffected by a Completed or Potential Exposure Pathway* For:
LocationAverageNo. ofPersonsPAHs PCBsChlorinated
Organic
Compounds
Heavy Metals ex.Pb, Cr, Ar
Residents** ofClackamas/
Johnson City.
on-site at NWP&Cand off-siteexposure in Deer Creek/
drainage ways.
40Soil

Ambient AirGroundwater,Surface water,Sediment,Food chain

Soil

Groundwater,Surface water,Sediment,Food chain

SoilSoil
Groundwater

Surface water,Sediment

Workers atbusinesses(industrialparks, ODOT)on-site-parcel A,industrial park eastof NWP&C duringremediation1500Ambient AirSoilAmbient AirSoil

City ofMilwaukieResidentsOff-site during pastmunicipal watersupplycontamination and ifthese supplies areaffected again. Private Wells.19,000Groundwater
GroundwaterGroundwater

(limited no. ofelevated levels)

FacilityWorkers**on-site exposure75Ambient Air
Soil
Soil

* potential exposure pathways are underlined
** residents who trespassed or workers who also lived near NWP&C may have a combination ofon-site and off-site exposures.

APPENDIX C - HEALTH GUIDELINES FOR EXPOSED POPULATION

Table 25. Comparison of Estimated Exposed Dose to Health Guidelines for Former SiteWorkers and Trespassers.

ContaminantExposurePathwayHealth Guideline for Ingestion - mg/kg/day
ValueSourceExceeded by EstimatedExposure Dose
AcenaphtheneSoils0.06RfDNo
AnthraceneSoils0.3RfDNo
Benzo (g,h,i)-peryleneSoilsNoneNoneNone
FluorantheneSoils0.04RfDNo
FluoreneSoils0.04RfDNo
NaphthaleneSoilsNoneNoneNone
PhenanthreneSoils NoneNoneNone
PyreneSoils0.03RfDNo
Benzo(a)anthraceneSoilsNoneNoneNone
Benzo(b) fluoranthene SoilsNoneNoneNone
Benzo(k) fluorantheneSoilsNoneNoneNone
Benzo(a)pyreneSoils0.1MRLNo
ChryseneSoilsNone NoneNone
Dibenzo(a,h) anthraceneSoilsNoneNoneNone
Indeno(1,2,3-c,d) pyreneSoilsNoneNoneNone
BenzeneSoilsNoneNoneNone
DibenzofuranSoilsNoneNoneNone
PCBs:Aroclor 1254Soils0.000005MRLYes
TetrachloroetheneSoils0.01RfDNo
1,1,1- trichloroethaneSoils0.09RfDNo
TrichloroetheneSoils0.7Int.MRLNo


ContaminantExposurePathwayHealth Guideline for Ingestion - mg/kg/day
ValueSourceExceeded by EstimatedExposure Dose
AluminumSoils1RfDNo
AntimonySoils0.0004RfDNo
ArsenicSoils0.003RfDNo
BariumSoils0.07RfDNo
BerylliumSoils0.005RfDNo
ChromiumSoils1RfDNo
CobaltSoilsNoneNoneNone
CopperSoils0.02-0.04ADI**No
IronSoils1.13

0.14

RDA Children

RDA men

No

No

LeadSoilsNoneNoneNone
ManganeseSoils0.1RfDNo
NickelSoils0.02RfDNo
VanadiumSoils0.003Inter.MRLNo
ZincSoils0.17
0.21
0.62
RDA Women
RDA Men
RDA Children
No
No
No

* RDA = Recommended Dietary Allowance.
** ADI = Estimated Safe and Adequate Daily Dietary Intake.

Table 26.Comparison of Estimated Exposed Dose to Health Guidelines for Users of WellWater Near the Site

ContaminantExposurePathwayHealth Guideline for Ingestion - mg/kg/day
ValueSourceExceeded by EstimatedExposure Dose
BariumWell Water
B
0.07RfDNo
CopperWell Water
B
0.02-0.04ADINo
IronWell WaterB1.13
0.14
0.26
RDA Children
RDA men
RDA Women
No
No
No
LeadWell WaterBNoneNoneNone
ManganeseWell WaterB0.1RfDNo
VanadiumWell WaterB0.003Inter.MRLNo
ZincWell WaterB0.17
0.21
0.62
RDA Women
RDA Men
RDA Children
No
No
No


Table 27. Comparison of Estimated Exposed Dose to Health Guidelines for Users of WellWater in Milwaukie.

ContaminantExposurePathwayHealth Guideline for Ingestion - mg/kg/day
ValueSourceExceeded by EstimatedExposure Dose
ManganeseWell Water0.1RfDNo
VanadiumWell Water0.003Inter.MRLYes, Child Only


Table 28.Comparison of Estimated Exposed Dose to Health Guidelines for Contaminantsin Off-site Soils

ContaminantExposurePathwayHealth Guideline for Ingestion - mg/kg/day
ValueSourceExceeded by EstimatedExposure Dose
Benzo (g,h,i)-peryleneSoilsNoneNoneNone
FluorantheneSoils0.04RfDNo
PhenanthreneSoils NoneNoneNone
PyreneSoils0.03RfDNo
Benzo(a)anthraceneSoilsNoneNoneNone
Benzo(b) fluoranthene SoilsNoneNoneNone
Benzo(k) fluorantheneSoilsNoneNoneNone
Benzo(a)pyreneSoils0.1MRLNo
ChryseneSoilsNone NoneNone
Indeno(a,b) anthraceneSoilsNoneNoneNone
Bis(2-ethylhexyl) phthalateSoils0.02RfDPica Only
Di-n-octyl phthalateSoilsNoneNoneNone
MethoxychlorSoils0.005RfDPica Only
AluminumSoils1RfDNo
ArsenicSoils0.003RfDNo
BariumSoils0.07RfDPica Only
Chromium (III)Soils1RfDNo
CobaltSoilsNoneNoneNone
CopperSoils0.02-0.04ADINo
IronSoils1.13
0.14
0.26
RDA Children
RDA men
RDA Women
Pica Only
No
No
LeadSoilsNoneNoneNone
ManganeseSoils0.1RfDPica Only
NickelSoils0.02RfDNo
VanadiumSoils0.003Inter. MRLYes, Pica Only
ZincSoils0.17
0.21
0.62
RDA Women
RDA Men
RDA Children
No
No
No

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