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


CONCLUSIONS

  1. The Northwest Pipe and Casing Company site is a public health hazard because of exposure toPAHs, dibenzofuran, and PCBs in soils at levels that could cause adverse health effects such asminor skin problems, mild immune depression, minor stomach pains, and vomiting. Due to siteaccessibility and surficial contamination by PAHs, human exposure to soil contaminants islikely. In addition, exposure to PAHs and PCBs in soils at the site could result in a lowincreased risk of excess cancer over a lifetime.


  2. Former workers and trespassers on site, and residents could also have been exposed tobenzene, bis/di(2-ethylhexyl)phthalate, di-n-octylphthalate, methoxychlor, tetrachloroethene,1,1,1-trichloroethane, trichloroethene, and heavy metals in soils. However, adverse health effectsare unlikely to occur because of exposure to low levels of these contaminants.


  3. There were past worker exposure issues at NWP&C due to coal tar emissions. Historicalrecords indicate that former workers at the NWP&C site were exposed to coal tar vapors inambient and in-door air during pipe coating operations. Past exposure to PAHs and organicsolvents probably occurred through ambient and indoor air in the past and during on-site fires. However, data and information are not available.


  4. The shallow aquifer on-site is contaminated with PAHs.


  5. Coal tar emissions, buried wastes, contaminated soil, sediments, and runoff water from the siteare potential pathways for human exposure. Drainage ditches carrying surface run-off to localstreams and floods carrying sediment may be contributing to off-site contamination. The foodchain including garden vegetables is also a potential pathway for exposure to environmentalcontamination. These pathways are unlikely to result in exposures at levels of healthsignificance, particularly if proper remedial measures are taken.


  6. There are multiple sources in the area of metals and chlorinated organic compounds.


  7. Data inadequacies include a lack of historical information on worker exposures and ambientand indoor air during facility operations. Further information on groundwater contaminationincluding additional background data on metals in groundwater and identification of private wellusers is needed. Further soil sampling is needed to determine if residential yards have beencontaminated with PAHs.

RECOMMENDATIONS

CEASE/REDUCE EXPOSURE RECOMMENDATIONS

  1. Due to the proximity of the industrial parks and other businesses, on and off-site airmonitoring should be conducted during soil disturbing activities. Perimeter air monitoringshould be maintained during remedial or other soil disturbing activities. In addition, theconstruction of highway that is likely to run through the site should not begin until tests haveshown that levels of contaminants in on-site soils are not of health concern and physical hazardshave been reduced.


  2. Maintain restricted access to the site so that trespassers do not have easy access to chemicaland physical hazards.


  3. Migration of shallow contaminated groundwater on the NWP&C site should be prevented sothat drinking water is not affected.

SITE/AREA CHARACTERIZATION RECOMMENDATIONS

  1. Further characterize surface and subsurface contamination on both parcels A and B. Samplingshould be conducted to confirm that buried drums are not present on property owned byNorthwest Development and ODOT (parcel A). Further characterization of contaminants onODOT property is needed. Metals analysis of chromium should determine if chromium (VI) ispresent. Sampling should determine if NWP&C is contributing to metal contamination or ifother potential sources are contributing to high background levels.


  2. Dioxin/furan analyses should be conducted particularly in areas where PCBs have been found.


  3. Determine the location of private wells within a one-mile radius of the site and the number ofprivate well users. Determine the extent of groundwater contamination.


  4. Since surface water may be used for drinking water (and possibly livestock watering) andirrigation, the use of surface water should be determined and further creek sampling conducted.

  5. Due to reports from previous employees, the storm sewers should be considered as an avenuefor migration of contaminants and sampled accordingly.


  6. Further sampling of residential yards for PAH contamination should be considered.

Health Activities Recommendation Panel (HARP) Determinations

The data and information developed in the Northwest Pipe and Casing Company preliminarypublic health assessment have been evaluated by the HARP for appropriate follow-up withrespect to health actions. Because former workers and trespassers in the community wereprobably exposed to hazardous substances, HARP determined that community health educationis needed to assist them in understanding their probable exposure to contaminants on site. Ifadditional data and information become available, ATSDR will reevaluate this site for anyadditional indicated follow-up.

Public Health Action Plan

The purpose of the Public Health Action Plan (PHAP) is to ensure that this public healthassessment not only identifies public health hazards but also provides a plan of action designedto mitigate and prevent adverse human health effects resulting from exposure to hazardoussubstances in the environment.

ATSDR evaluated this site for community health education and determined that the intendedaudience of former workers and trespassers were unlikely to be reached by this activity,therefore, no further community health activities are planned. ATSDR will continue tocollaborate with appropriate federal, state, and local agencies to pursue the implementation of therecommendations outlined in this public health assessment. EPA plans to pursue the private wellsurvey or site/area characterization recommendation #3.

The final PHAP will be evaluated annually unless additional information warrants more frequentevaluation.

PREPARERS OF REPORT



Environmental:

Laura Barr
Environmental Health Scientist
Environmental Science Section
Remedial Program Branch

Health:

Moses Kapu, Ph.D.
Toxicologist
Health Science Section
Remedial Program Branch

Regional Representative:
Greg Thomas
Region X - Seattle, WA
Regional Program Office

REFERENCES

  1. Oregon Department of Environmental Quality. Preliminary Assessment, Northwest Pipe andCasing Company. Prepared for US EPA. September 29, 1987.


  2. U. S. Environmental Protection Agency. Site Inspection Report for Northwest Pipe andCasing, Clackamas, Oregon, prepared by Ecology and Environment, Inc., December, 1988.


  3. Oregon Department of Environmental Quality. Interoffice memorandum to the file, NW Pipeand Casing. April 22, 1988.


  4. U. S. Environmental Protection Agency. Listing Site Inspection Report for Northwest Pipeand Casing, Clackamas, Oregon, prepared by Ecology and Environment, Inc., June, 1990.


  5. ATSDR Record of Activity, personal communication with EPA, August 29, 1994.


  6. Clackamas County Development Agency. Letter to US EPA, May 23, 1988.


  7. Newspaper article in The Oregonian. Pollutant contaminates 4 sites, 2/6/90.


  8. Environmental Protection Agency. EPA Toxic Chemical Release Inventory (TRI) file onToxicology Data Network (TOXNET). Bethsada, MD: National Library of Medicine. September, 1991.


  9. ATSDR Record of Activity, personal phone communication with ATSDR Region X, January29, 1993.


  10. ATSDR Record of Activity, personal phone communication with National Guard at CampWithycombe, January 29, 1993.


  11. Agency for Toxic Substances and Disease Registry. Search for records of violations- airquality section of DEQ, interoffice memorandum: January 20, 1977; January 21, 1977; October14, 1983; April 22, 1988 and DEQ letter to NWP&C, Notice of Violation, September 2, 1983.


  12. Agency for Toxic Substances and Disease Registry. Toxicological Profile for PolycyclicAromatic Hydrocarbons. Atlanta: ATSDR, December 1990.


  13. Metz Engineering Company. An Engineering Analysis of Effluents and Emissions from aCoal Tar Pipe Coating Operation, July 11, 1973.


  14. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Benzene. Atlanta, Ga: ATSDR, October 1991.


  15. National Institute of Environmental Health Sciences. Annual Report on Carcinogens. Research Triangle Park, 1991.


  16. Agency for Toxic Substances and Disease Registry. Toxicological Profile forDi(2-ethylhexyl)phthalate. Atlanta, Ga: ATSDR, October 1991.


  17. National Institutes of Health. Hazardous Substances Data Bank: Dibenzofuran andDi-n-octylphthalate. National Library of Medicine, August 1991.


  18. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Methoxychlor. Atlanta, Ga: ATSDR, October 1991.


  19. Agency for Toxic Substances and Disease Registry. Toxicological Profile for SelectedPCBs. Atlanta, Ga: ATSDR, October 1991.


  20. Agency for Toxic Substances and Disease Registry. Toxicological Profile forTetrachloroethylene. Atlanta, Ga: ATSDR, October 1991.


  21. Agency for Toxic Substances and Disease Registry. Draft Toxicological Profile for1,1,1-Trichloroethane. Atlanta, Ga: ATSDR, December 1990.


  22. Agency for Toxic Substances and Disease Registry. Toxicological Profile forTrichloroethylene. Atlanta, Ga: ATSDR, October 1991.


  23. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Aluminum. Atlanta, Ga: ATSDR, July 1992.


  24. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Antimony. Atlanta, Ga: ATSDR, October 1990.


  25. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Arsenic. Atlanta, Ga: ATSDR, October 1991.


  26. Agency for Toxic Substances and Disease Registry. Draft Toxicological Profile for Barium. Atlanta, Ga: ATSDR, July 1992.


  27. Agency for Toxic Substances and Disease Registry. Draft Toxicological Profile forBeryllium. Atlanta, Ga: ATSDR, October 1991.


  28. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Chromium. Atlanta, Ga: ATSDR, July 1992.


  29. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Cobalt. Atlanta, Ga: ATSDR, July 1992.


  30. Food and Nutrition Board. National Research Council-National Academy of Sciences. Recommended Dietary Allowances, 9th ed. 1980.


  31. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Copper. Atlanta, Ga: ATSDR, December 1990.


  32. Derosa CT, Choudhuri,H and Peirano, WB. An integrated Exposure/Pharmacokinetic BasedApproach to the Assessment of Complex Exposures. Toxicology and Industrial Health, Vol. 7,No. 4, 231-248, 1991.


  33. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Manganese. Atlanta, Ga: ATSDR, July 1992.


  34. Agency for Toxic Substances and Disease Registry. Toxicological Profile for nickel. Atlanta, Ga: ATSDR, October 1991.


  35. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Vanadium. Atlanta, Ga: ATSDR, July 1992.


  36. Agency for Toxic Substances and Disease Registry. Draft Toxicological Profile for Zinc. Atlanta, Ga: ATSDR, July 1992.

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