DSHW-2003-003584 - 0901a0688013d24f

ATK
ALLIANT TECHSYSTEMS
25 April 2003
8200-CY04:ST009
Mr. Dennis R. Downs, Executive Secretary
State ofUtah
Department of Environmental Quality
Division of Solid and Hazardous Waste
288 N. 1460 W.
P.O. Box 144880
Salt Lake City, Utah 84114-4880
Dear Mr. Downs
ATTENTION: Jeff Vandel
Thiokol Propulsion Corp.
P.O. Box 707
Brigham City, UT 84302-0707
Tel [phone]
Fax [phone]
HAND DELIVERED
APR 2 5 2003
Utah Division of Solid
and Hazardous Waste
Subject: Follow up to March 4, 2003 meeting with DSHW to discuss the DSHW letter
dated January 22, 2003 with the topic "Uptake of Perchlorate by Plants Adjacent to
Contaminated Springs at ATK Thiokol Propulsion - Promontory, EPA ID #UTD009081357".
A concem was raised by the DSHW related to the potential exposure pathway of perchlorate to
humans through the consumption of cattle exposed to environmental levels of perchlorate.
The DSHW asked ATK Thiokol Propulsion to investigate this in the March 4, 2003 meeting.
ATK Thiokol Propulsion has reviewed documentation and talked with toxicologists regarding
this issue. Attached is a report on the findings ofthis review. Based on the current understanding
of perchlorate phamacokinetics, actual cattle management practices and conservative
calculations, Thiokol concludes that the cattle to human exposure route is a very low probability
or concem.
If you have any questions regarding this report, please direct them to myself at [phone].
Sincerely
^^4^ V 4»-Vf(5 U^
Paul V. Hancock, Manager
Environmental Remediation