DSHW-2003-007493 - 0901a068801604c8

November 4, 2003

Paul Hancock, Environmental Remediation Manager
ATK Thiokol Propulsion – Promontory Facility
P.O. Box 707
Brigham City, UT 84302-0707

RE: Report on the Uptake of Perchlorate by Plants and the Potential for Human Exposure Via Consumption of Beef at the ATK Thiokol Propulsion – Promontory Facility #UTD009081357

Dear Mr. Hancock:

This letter is in response to your correspondence dated July 21, 2003 regarding your investigation of the potential risk to human health from the ingestion of beef produced from cattle
that have consumed vegetation and water contaminated with perchlorate. Your correspondence was in response to a letter from our office containing comments and questions on your original
investigation of this issue dated April 25, 2003.

The Division of Solid and Hazardous Waste (the Division) has reviewed your responses to our questions and the revised report on the potential human health risk associated with this exposure
pathway. Based on current conditions and available data, the Division is satisfied with Thiokol’s conclusion that the risk posed to human health does not appear to be a concern. Perchlorate
appears to be unlikely to accumulate in beef at concentrations that would be detrimental to humans based on the current understanding of perchlorate concentrations, grazing at the site,
and the dynamics of perchlorate uptake into cattle. The Division expects that some of the uncertainties associated with the analysis, such as the concentration of perchlorate in forage,
will be reduced by future investigations. As an additional precautionary measure, ATK should consider preventing ongoing exposures by fencing off areas known to be contaminated with
perchlorate.

If you have any questions regarding this letter, please contact Jeff Vandel at 538-9413. Thank you for your cooperation.

Sincerely,
Original Document Signed by Dennis R. Downs on 11/4/03

Dennis R. Downs, Executive Secretary
Utah Solid and Hazardous Waste Control Board

DRD\jv\kk

c: Linda Bowling, USEPA Region VIII
John C. Bailey, M.D., M.S.P.H., Health Officer/Director, Bear River Health Dept.
Pete Holmgren, 13657 West Highway 102, Tremonton, UT 84337

U:\SHW\HWB\JVANDEL\WP\Thiokol\TN200302271
file to: ATK Thiokol Propulsion - Promontory

October 28, 2003
Page 2

Michael O. Leavitt
Governor
Dianne R. Nielson, Ph.D.
Executive Director
Dennis R. Downs
Director

Department of Environmental Quality
Division of Solid and Hazardous Waste
288 North 1460 West
P.O. Box 144880

Salt Lake City, Utah 84114-4880
[phone]
[phone] Fax
[phone] T.D.D.
www.deq.utah.gov