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HEALTH CONSULTATION

ST. LUCIE RESIDENCES
ST. LUCIE, ST. LUCIE COUNTY, FLORIDA

November 13, 1998

Prepared by:

Exposure Investigation and Consultation Branch
Division of Health Assessment and Consultation
Agency for Toxic Substances and Disease Registry


TABLE OF CONTENTS

BACKGROUND AND STATEMENT OF ISSUES

DISCUSSION

CONCLUSIONS

RECOMMENDATION

REFERENCES

 

BACKGROUND AND STATEMENT OF ISSUES

The Florida Department of Health requested the Agency for Toxic Substances and Disease Registry (ATSDR) to review the results of environmental samples collected from different residences in St. Lucie County, Florida, and to evaluate the possible health implications associated with exposure to the substances reported.

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 [1].

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.

DISCUSSION

An evaluation of the environmental sampling data provided to ATSDR indicates that most of the chemicals analyzed for in different media (i.e., soil, indoor air, air conditioner dust, and well water) were not detected. The estimated concentrations for each contaminant that were reported in soil, well water, air conditioner dust, and air samples are within normal background levels. Additionally, the concentrations of VOCs that were reported in the air samples are within normal background ranges and are probably related to the use of household products. For example, the estimated values for benzene reported by the analytical laboratory ranged from non-detect to 1.8 ppb. An air quality study for benzene from 185 residences in the United States reported that the median value for benzene was at 2.2 ppb in residences of non-smokers [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 [3]. 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 [1]. 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.


CONCLUSIONS

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.

RECOMMENDATION

No follow-up investigations are recommended. If further clarification is necessary, or if additional sampling data become available, ATSDR is available to assist upon request.



Robert L. Williams, Ph.D.
Toxicologist


Concurrence: Susan Moore
Section Chief



REFERENCES

1. Data Package for St. Lucie County Cancer Cluster Investigation, prepared by the Florida Department of Health Bureau of Laboratories, Jacksonville, FL, September 16, 1998.

2. ATSDR Update Toxicological Profile for Benzene, February 20,1996.

3. Exposure to the general population to gasoline, Akland, G., Environmental Health Perspectives 1993; 101 Suppl. 6:27-32.

Table of Contents

  
 
USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Agency for Toxic Substances and Disease Registry, 4770 Buford Hwy NE, Atlanta, GA 30341
Contact CDC: 800-232-4636 / TTY: 888-232-6348

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