ST. LUCIE RESIDENCES
ST. LUCIE, ST. LUCIE COUNTY, FLORIDA
November 13, 1998
Exposure Investigation and Consultation Branch
Division of Health Assessment and Consultation
Agency for Toxic Substances and Disease Registry
BACKGROUND AND STATEMENT OF ISSUES
From January 1998 through June 1998, the Florida Department of Health collected well water, soil, indoor air, and air conditioner dust samples from eight residences in St. Lucie County, Florida .
The results indicate that most of the chemicals analyzed for in soil, indoor air, air conditioner dust, and well water samples were not detected. The values that were reported by the analytical laboratory for various contaminants were estimated values that were between the method of detection limit and the practical quantitation limit.
2]. Another study showed that the average indoor air concentration of benzene in homes without smokers was 3.1 ppb in the fall and winter and 1.5 ppb in the spring and summer . A national survey reported that the average outdoor air concentration of benzene was 2.8 ppb and the median outdoor air concentration was 1.7 ppb . Therefore, the levels of VOCs detected in certain homes do not exceed background levels. Additionally, the estimated concentrations for the chemicals reported in indoor air, soil, air conditioner dust and well water do not pose a health threat for cancerous or non-cancerous adverse health effects.
Based on the data reviewed, levels of contaminants detected in soil, well
water, air, and air conditioner dust samples are below concentrations that would
result in an increased cancer risk. Also, contaminants are below levels that
pose a non-cancer health threat.
No follow-up investigations are recommended. If further clarification is necessary,
or if additional sampling data become available, ATSDR is available to assist
Robert L. Williams, Ph.D.
Concurrence: Susan Moore