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ATSDR classifies the Choulic Gravel Pit site as an Indeterminate Public Health Hazard.

The initial concern associated with cattle and wildlife drinking contaminated surface water has been addressed by the installation of a fence around the perimeter of the site. However, members of the Tohono O'odham Nation have recently raised concerns about the potential impact to groundwater or drinking water in the area. ATSDR has no groundwater contaminant data for this site and, therefore, can draw no conclusions about the public health impact associated with any groundwater or drinking water contamination.


The results of the upcoming investigation will provide additional information on contamination associated with the site. In particular, ATSDR should review environmental sampling results to evaluate the public health impacts from any groundwater or drinking water contamination associated with the site.


  1. Tohono O'odham Nation. Letter from Sylvester Listo, Chairman, Tohono O'odham Nation to Ms. Linda Wright, Environmental Health Scientist, ATSDR. April 27, 1995.

  2. ATSDR. Personal Communication with ATSDR Personnel. May 27, 1998.

  3. ATSDR. Personal Communication with Tohono O'odham Nation Representative. July 7, 1998.

  4. Haztech. Services and Project Status Report for Choulic Village Remediation. Prepared by Haztech Enviro-Systems, Inc., Edward Gilmore, Project Manager, J. Robert Tate, JD, PE. March 14, 1994.

  5. IHS. Letter from Steve Inserra, Office of Environmental Health and Engineering, Indian Health Service to Linda Wright, ATSDR. May 4, 1995.

  6. C.W. Stockton and Assoc. A Preliminary Evaluation of Possible Ground Water Pollution from Hydrocarbons Suspected to be Buried in a Gravel Pit Located 2.8 Miles East, Southeast, of Choulic, Arizona, Tohono O'odham Nation. Prepared by C.W. Stockton and Associates, Inc., 10451 East Plumeria Road, Tucson, Arizona. August 4, 1994.

  7. ATSDR. Personal Communication with Tohono O'odham Nation Representative. June 22, 1998.

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