PUBLIC HEALTH ASSESSMENT
NORTHWEST PIPE AND CASING COMPANY
CLACKAMAS, CLACKAMAS COUNTY, OREGON
APPENDIX B - PATHWAYS ANALYSES
TABLE 22. COMPLETED EXPOSURE PATHWAYS
| PATHWAYNAME/ENVIRONMENTAL MEDIA | TIME | ||||
| SOURCE | POINT(S) OFEXPOSURE | ROUTE OFEXPOSURE | EXPOSEDPOPULATION | ||
| Ambient andIn-door Air | Coal tar vapors frompipe coating activities,coal tar pots, and wasteburn pile. | Inside NWP&C buildings,outside near burning andwaste areas. | Inhalation | Former workers | Past |
| Soil | Waste 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 | Unidentified | Residences, Businesses | Ingestion Inhalation Skin Contact | Past municipal well users | Past Future |
TABLE 23. POTENTIAL EXPOSURE PATHWAYS
| PATHWAYNAME/ENVIRONMENTAL MEDIA | EXPOSURE PATHWAY ELEMENTS | TIME | |||
| SOURCE | POINT OFEXPOSURE | ROUTE OFEXPOSURE | EXPOSEDPOPULATION | ||
| Ambient Air | Coal tar emissions from NWP&C. | Town of Clackamas Other nearby residential/ commercial areas. | Inhalation | Residents | Past |
| Soil Gas | NWP&C buried wastes &soil contamination | On- or off-site nearNWP&C | Inhalation | Residents, Workers | Past Present Future |
| Sediment | Runoff 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 water | Runoff 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 contamination | Possibly privatewells downgradientof the site. | Ingestion Skin Contact | Any well users drawingfrom shallow groundwaterdowngradient of site | Past Present Future |
| DeepGroundwater-private wells | Unidentified | Residences | Ingestion Skin Contact | Private well users | Past Present Future |
| Food Chain/ Fish & animal | Surface runoff, sediment. | Deer Creek | Ingestion | Creek fish eaters | Past Present Future |
| Food Chain/Fruits &Vegetables | Waste in Soil, Atmospheric deposition of contaminants, Irrigating withcontaminated surface wateror groundwater. | On-site berry bushes,local gardens | Ingestion | Residents eating on-siteberries or gardening offsite. | Past Present Future |
TABLE 24 - ESTIMATED POPULATION FOR COMPLETED AND POTENTIALEXPOSURE PATHWAYS
| Exposed Populations and Potentially ExposedPopulations | Affected by a Completed or Potential Exposure Pathway* For: | |||||
| Location | AverageNo. ofPersons | PAHs | PCBs | Chlorinated Organic Compounds | Heavy Metals ex.Pb, Cr, Ar | |
| Residents** ofClackamas/ Johnson City. | on-site at NWP&Cand off-siteexposure in Deer Creek/ drainage ways. | 40 | Soil Ambient AirGroundwater,Surface water,Sediment,Food chain | Soil Groundwater,Surface water,Sediment,Food chain | Soil | Soil Groundwater Surface water,Sediment |
| Workers atbusinesses(industrialparks, ODOT) | on-site-parcel A,industrial park eastof NWP&C duringremediation | 1500 | Ambient AirSoil | Ambient AirSoil | ||
| City ofMilwaukieResidents | Off-site during pastmunicipal watersupplycontamination and ifthese supplies areaffected again. Private Wells. | 19,000 | Groundwater | Groundwater | Groundwater (limited no. ofelevated levels) | |
| FacilityWorkers** | on-site exposure | 75 | Ambient 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.
| Contaminant | ExposurePathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by EstimatedExposure Dose | ||
| Acenaphthene | Soils | 0.06 | RfD | No |
| Anthracene | Soils | 0.3 | RfD | No |
| Benzo (g,h,i)-perylene | Soils | None | None | None |
| Fluoranthene | Soils | 0.04 | RfD | No |
| Fluorene | Soils | 0.04 | RfD | No |
| Naphthalene | Soils | None | None | None |
| Phenanthrene | Soils | None | None | None |
| Pyrene | Soils | 0.03 | RfD | No |
| Benzo(a)anthracene | Soils | None | None | None |
| Benzo(b) fluoranthene | Soils | None | None | None |
| Benzo(k) fluoranthene | Soils | None | None | None |
| Benzo(a)pyrene | Soils | 0.1 | MRL | No |
| Chrysene | Soils | None | None | None |
| Dibenzo(a,h) anthracene | Soils | None | None | None |
| Indeno(1,2,3-c,d) pyrene | Soils | None | None | None |
| Benzene | Soils | None | None | None |
| Dibenzofuran | Soils | None | None | None |
| PCBs:Aroclor 1254 | Soils | 0.000005 | MRL | Yes |
| Tetrachloroethene | Soils | 0.01 | RfD | No |
| 1,1,1- trichloroethane | Soils | 0.09 | RfD | No |
| Trichloroethene | Soils | 0.7 | Int.MRL | No |
| Contaminant | ExposurePathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by EstimatedExposure Dose | ||
| Aluminum | Soils | 1 | RfD | No |
| Antimony | Soils | 0.0004 | RfD | No |
| Arsenic | Soils | 0.003 | RfD | No |
| Barium | Soils | 0.07 | RfD | No |
| Beryllium | Soils | 0.005 | RfD | No |
| Chromium | Soils | 1 | RfD | No |
| Cobalt | Soils | None | None | None |
| Copper | Soils | 0.02-0.04 | ADI** | No |
| Iron | Soils | 1.13 0.14 | RDA Children RDA men | No No |
| Lead | Soils | None | None | None |
| Manganese | Soils | 0.1 | RfD | No |
| Nickel | Soils | 0.02 | RfD | No |
| Vanadium | Soils | 0.003 | Inter.MRL | No |
| Zinc | Soils | 0.17 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
| Contaminant | ExposurePathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by EstimatedExposure Dose | ||
| Barium | Well Water B | 0.07 | RfD | No |
| Copper | Well Water B | 0.02-0.04 | ADI | No |
| Iron | Well WaterB | 1.13 0.14 0.26 | RDA Children RDA men RDA Women | No No No |
| Lead | Well WaterB | None | None | None |
| Manganese | Well WaterB | 0.1 | RfD | No |
| Vanadium | Well WaterB | 0.003 | Inter.MRL | No |
| Zinc | Well WaterB | 0.17 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.
| Contaminant | ExposurePathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by EstimatedExposure Dose | ||
| Manganese | Well Water | 0.1 | RfD | No |
| Vanadium | Well Water | 0.003 | Inter.MRL | Yes, Child Only |
Table 28.Comparison of Estimated Exposed Dose to Health Guidelines for Contaminantsin Off-site Soils
| Contaminant | ExposurePathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by EstimatedExposure Dose | ||
| Benzo (g,h,i)-perylene | Soils | None | None | None |
| Fluoranthene | Soils | 0.04 | RfD | No |
| Phenanthrene | Soils | None | None | None |
| Pyrene | Soils | 0.03 | RfD | No |
| Benzo(a)anthracene | Soils | None | None | None |
| Benzo(b) fluoranthene | Soils | None | None | None |
| Benzo(k) fluoranthene | Soils | None | None | None |
| Benzo(a)pyrene | Soils | 0.1 | MRL | No |
| Chrysene | Soils | None | None | None |
| Indeno(a,b) anthracene | Soils | None | None | None |
| Bis(2-ethylhexyl) phthalate | Soils | 0.02 | RfD | Pica Only |
| Di-n-octyl phthalate | Soils | None | None | None |
| Methoxychlor | Soils | 0.005 | RfD | Pica Only |
| Aluminum | Soils | 1 | RfD | No |
| Arsenic | Soils | 0.003 | RfD | No |
| Barium | Soils | 0.07 | RfD | Pica Only |
| Chromium (III) | Soils | 1 | RfD | No |
| Cobalt | Soils | None | None | None |
| Copper | Soils | 0.02-0.04 | ADI | No |
| Iron | Soils | 1.13 0.14 0.26 | RDA Children RDA men RDA Women | Pica Only No No |
| Lead | Soils | None | None | None |
| Manganese | Soils | 0.1 | RfD | Pica Only |
| Nickel | Soils | 0.02 | RfD | No |
| Vanadium | Soils | 0.003 | Inter. MRL | Yes, Pica Only |
| Zinc | Soils | 0.17 0.21 0.62 | RDA Women RDA Men RDA Children | No No No |
