Health Consultation: Exposure Investigation Report. Dallas Avenue Neighborhood PCB Seattle King County, Washington

摘要

The Washington State Department of Health (DOH) has determined a need for indoor dust sampling at residences located near the Dallas Avenue South Soil Removal site, where polychlorinated biphenyls (PCBs) contaminated soils above Washington State soil cleanup levels have been discovered along and adjacent to streets and in some residential yards. The purpose of this health consultation is to evaluate whether the PCBs found in house dust at the two homes adjacent to Dallas Avenue South Soil Removal site pose a health concern to the residents. DOH prepares health consultations under a cooperative agreement with the Agency for Toxic Substances and Disease Registry (ATSDR). The Dallas Avenue South Soil Removal site is located in a mixed residential, commercial, and industrial area in the South Park community of Seattle, Washington. The City of Seattle (City) detected PCBs in road dust along an unpaved portion of Dallas Avenue road dust and adjacent surface soils in July 2004, with levels ranging from 0.26 to 9 milligrams per kilogram (mg/kg). The samples were analyzed for Aroclor compounds using U.S. Environmental Protection Agency (EPA) Method 8082. The only Aroclor detected was Aroclor 1260. The highest level was discovered in sediment collected from a catch basin on 17th Avenue South near two residences. One of those houses is about 90 years old; the other home is around 70 years old. he City and Public Health Seattle and King County (PHSKC) conducted additional surface soil sampling from September 2004 through March 2005 to continue characterizing the extent of the PCB contamination. Soil samples were collected from the surface (0 6 inches) below ground surface (bgs) and (6 inches to 5 feet bgs). Again, Aroclor 1260 was the only Aroclor compound detected. The maximum Aroclor 1260 level in surface soils was 93 mg/kg, and the highest Aroclor 1260 level in sub-surface soils was 480 mg/kg. DOH reviewed the chromatograms associated with the PHSKC data and found that low levels of Aroclor 1254 might also be present, however, Aroclor 1254 is not likely to be present in quantities that would significantly affect total PCB levels. It should be noted that some detection limits were elevated so it is possible that other Aroclor compounds could be present.