Newer residences tended to have lower levels of contaminants than older, probably due to more recent soils disturbances from grading and landscaping. Although the study focused only on University Place, Ecology believes other areas of Tacoma and Pierce County affected by the smelter are likely to have similar levels of contamination. Although soil arsenic and lead levels are elevated, the concentrations do not indicate an immediate health hazard exists to residents or workers. Rather, the agencies involved are concerned about the public s persistent exposure to low levels of arsenic and lead-contaminated soils over a long period of time. Arsenic is a known human carcinogen and lead exposure can result in developmental disabilities.
Ecology is very concerned about the long-term exposure to arsenic and lead, especially for children.
Young children up to age 6 are the population most at risk for arsenic and lead contamination because they play directly in dirt where they can ingest contaminated soil through their mouths and inhale dust through their noses. None of the children tested were found with elevated blood lead levels. Normally, Ecology works on cleanup sites that measure in square feet, yards or acres not miles. This is the first time that local and state authorities have addressed soil contamination covering such a broad area, involving multiple residential neighborhoods. Ecology and the health agencies want to proceed quickly and carefully, making sure the best possible steps are taken to protect human health and the environment.