Health Consultation: Analysis of Nitrate and Metals Sampling Data East 67th Street Groundwater Plume Odessa, Ector County, Texas. EPA Facility ID: TXN000606614

摘要

The East 67th Street Groundwater Plume site is located north of the city limits of Odessa in Ector County, Texas (1). A Public Health Assessment was prepared in response to groundwater contamination, which was initially detected in one of four Public Water Supply (PWS) wells that service the Devilla Mobile Home Park on East 67th Street (2, 3). The groundwater contamination consisted of tetrachloroethene (also known as perchloroethene and/or PCE), trichloroethene (TCE), and their associated degradation products: cis-1,2-dichloroethene (DCE); 1,1-DCE; 1,2dichloroethane (DCA); and 1,1-DCA. Note: a list of abbreviations is included as Appendix A. Subsequent sampling was conducted by the United States Environmental Protection Agency (EPA) in January 2007. Sample results indicated nitrate concentrations above the Maximum Contaminant Level (MCL)1 of 10 milligrams per liter (mg/L). Metals, including arsenic, lead, selenium, thallium, and vanadium, were elevated above their respective Health Assessment Comparison (HAC) values and warranted further review.The Texas Department of State Health Services (DSHS) and the Agency for Toxic Substances and Disease Registry (ATSDR) reviewed the environmental information available for the site. We also evaluated the exposure pathways through which the public could contact nitrate and metals from the site. Residents who use water from the wells with high nitrates or metals would be exposed. The Texas Commission on Environmental Quality (TCEQ) sent letters notifying residents within a half-mile radius of elevated nitrates, and DSHS incorporated a public health message to prevent exposure for sensitive populations. The purpose of this Health Consultation is to present the nitrate information (See Appendix B) and to evaluate the sampling data and determine if exposure to the levels of metals in the drinking water wells are harmful to human health.