PUBLIC HEALTH ASSESSMENT
NORTHWEST PIPE AND CASING COMPANY APPENDIX B - PATHWAYS ANALYSES TABLE 22. COMPLETED EXPOSURE PATHWAYS
CLACKAMAS, CLACKAMAS COUNTY, OREGON
| PATHWAY NAME/ ENVIRONMENTAL MEDIA | TIME | ||||
| SOURCE | POINT(S) OF EXPOSURE | ROUTE OF EXPOSURE | EXPOSED POPULATION | ||
| Ambient and In-door Air | Coal tar vapors from pipe coating activities, coal tar pots, and waste burn pile. | Inside NWP&C buildings, outside near burning and waste areas. | Inhalation | Former workers | Past |
| Soil | Waste in soil (PAH's, PCB's and other organics) | Residential yards, On-site at NWP&C |
Ingestion Inhalation |
Residents near NWP&C, on-site trespassers, on-site property users: past truck drivers and hay workers, potential for nearby workers during remedial activities. | Past Present Future |
| Groundwater- Public Wells of Milwaukie |
Unidentified | Residences, Businesses | Ingestion Inhalation Skin Contact |
Past municipal well users | Past Future |
TABLE 23. POTENTIAL EXPOSURE PATHWAYS
| PATHWAY NAME/ ENVIRONMENTAL MEDIA | EXPOSURE PATHWAY ELEMENTS | TIME | |||
| SOURCE | POINT OF EXPOSURE | ROUTE OF EXPOSURE | EXPOSED POPULATION | ||
| 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 near NWP&C | Inhalation | Residents, Workers | Past Present Future |
| Sediment | Runoff carrying contaminants from NWP&C. | Drainage Ditches, Deer Creek, Flood areas south of NWP&C. |
Ingestion Skin Contact |
Ditch/Creek users,
Residents using area south of NWP&C near Camp Withycombe. |
Past Present Future |
| Surface water | Runoff carrying contaminants from NWP&C. | Drainage Ditches, Deer Creek, Flood areas south of NWP&C. |
Ingestion
Skin Contact |
Ditch/Creek users,
Residents using area south of NWP&C near Camp Withycombe. |
Past Present Future |
| Shallow Groundwater- private wells |
NWP&C buried wastes & soil contamination | Possibly private wells downgradient of the site. | Ingestion Skin Contact |
Any well users drawing from shallow groundwater downgradient of site | Past Present Future |
| Deep Groundwater- 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 with contaminated surface water or groundwater. |
On-site berry bushes, local gardens | Ingestion | Residents eating on-site berries or gardening off site. | Past Present Future |
TABLE 24 - ESTIMATED POPULATION FOR COMPLETED AND POTENTIAL EXPOSURE PATHWAYS
| Exposed Populations and Potentially Exposed Populations | Affected by a Completed or Potential Exposure Pathway* For: | |||||
| Location | Average No. of Persons | PAHs | PCBs | Chlorinated Organic Compounds |
Heavy Metals ex. Pb, Cr, Ar | |
| Residents** of
Clackamas/ Johnson City. |
on-site at NWP&C
and off-site
exposure in Deer Creek/ drainage ways. |
40 | Soil
Ambient Air Groundwater, Surface water, Sediment, Food chain |
Soil
Groundwater, Surface water, Sediment, Food chain |
Soil | Soil Groundwater Surface water, Sediment |
| Workers at businesses (industrial parks, ODOT) | on-site-parcel A, industrial park east of NWP&C during remediation | 1500 | Ambient Air Soil | Ambient Air Soil | ||
| City of Milwaukie Residents | Off-site during past municipal water supply contamination and if these supplies are affected again. Private Wells. | 19,000 | Groundwater | Groundwater | Groundwater
(limited no. of elevated levels) | |
| Facility Workers** | on-site exposure | 75 | Ambient Air Soil |
Soil | ||
* potential exposure pathways are underlined APPENDIX C - HEALTH GUIDELINES FOR EXPOSED POPULATION Table 25. Comparison of Estimated Exposed Dose to Health Guidelines for Former Site
Workers and Trespassers.
** residents who trespassed or workers who also lived near NWP&C may have a combination of
on-site and off-site exposures.
| Contaminant | Exposure Pathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by Estimated Exposure 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 | Exposure Pathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by Estimated Exposure 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. Table 26.Comparison of Estimated Exposed Dose to Health Guidelines for Users of Well
Water Near the Site
** ADI = Estimated Safe and Adequate Daily Dietary Intake.
| Contaminant | Exposure Pathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by Estimated Exposure Dose | ||
| Barium | Well Water B |
0.07 | RfD | No |
| Copper | Well Water B |
0.02-0.04 | ADI | No |
| Iron | Well Water B | 1.13 0.14 0.26 |
RDA Children RDA men RDA Women |
No No No |
| Lead | Well Water B | None | None | None |
| Manganese | Well Water B | 0.1 | RfD | No |
| Vanadium | Well Water B | 0.003 | Inter.MRL | No |
| Zinc | Well Water B | 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 Well Water in Milwaukie.
| Contaminant | Exposure Pathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by Estimated Exposure 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 Contaminants in Off-site Soils
| Contaminant | Exposure Pathway | Health Guideline for Ingestion - mg/kg/day | ||
| Value | Source | Exceeded by Estimated Exposure 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 |
