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[PDF-10.94 MB]
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Description:A request was made by the United States Postal Service to assess potential contamination from a soot producing electrical transformer malfunction at the Page Belcher Federal Building (SIC-9199), located in Tulsa, Oklahoma. The building has 27 separate air handling units and 77 interior air supply zones, plus one to three perimeter air supply zones for each of the four floors and two mezzanines. One air handling unit may serve from one to nine distribution zones. Low levels of airborne polychlorinated biphenyls (PCBs) were found throughout the building. There appeared to be no specific location within the building for a concentration of these chemicals. The vapor phase of the contaminant was enriched with lower chlorinated isomers relative to a source mixture on surfaces. The surface concentrations of PCBs and tetrachlorodibenzo-p-dioxin (1746016) (TCDD) equivalents, as measured in the primary occupancy areas of the building, were below respective surface guidelines for all samples, with the exception of two. Seven of the air handling units obtain their fresh makeup air through an outside grille located on the west side of the building directly above the transformer vault's exterior exhaust vent. The PCB surface concentrations in these seven air handling systems were significantly higher than those in the other systems for the building. PCB concentrations on workplace surfaces in areas serviced by these seven systems were also significantly higher than elsewhere in the building. Recommendations are offered for decontaminating the building and its ventilation system and for instituting a medical surveillance program.
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Pages in Document:118 pdf pages
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NIOSHTIC Number:nn:00167000
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NTIS Accession Number:PB87-183521
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Citation:Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HETA 85-289-1738, 1986 Oct;:1-100;
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Federal Fiscal Year:1987
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Peer Reviewed:False
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