DSHW-2005-006268 - 0901a06880165b79 (4)

Mike Stangl
Vice President, Acquisitions
S-Devcorp
90 East 7200 South, Suite 200
Midvale, Utah 84047

RE: Analytical Results for Water Samples

Dear Mr. Stangl:

The Division of Solid and Hazardous Waste (the Division) has received the analytical results for the water samples that were collected from your property south of the ATK Thiokol – Promontory
(Thiokol) facility. Two samples were collected on April 12, 2005. The sample locations are described below:

Stangl #1 – collected from the well that supplies water to the trailer on the property
Stangl #2 – collected from the creek that flows by the trailer next to the pump house

These samples were submitted to the Utah Department of Health, Division of Laboratory Services for analysis of volatile organic compounds and perchlorate. These analytical tests were
selected in order to determine if the contaminants that have been detected in groundwater at the Thiokol facility have impacted the sources described above. The results of the analytical
tests are summarized in the table below.

Stangl Water Sample Results
Constituent (ug/L) Stangl #1 Stangl #2 Trichloroethene (TCE) <1.0 <1.0 Perchlorate <8.0 37.7

Trichloroethene (TCE) and perchlorate are the two primary groundwater contaminants that have been observed at the Thiokol facility. No volatile organic compounds, including TCE, were
detected in either sample. Perchlorate was detected in the Stangl #2 sample at 37.7 ug/L, but was not detected in the Stangl #1 sample. Based on these results, and the results from
the samples that were collected in 2002, it appears that the well hasn’t been impacted by contaminants.

The perchlorate that was detected in the creek water at 37.7 ug/L was not expected since it’s believed that the creek flows out of Shotgun Spring, and this concentration is significantly
higher than any perchlorate sample results that have been obtained from the spring. The Stangl #2 sample results should be confirmed by collecting another sample. The Division will
contact you to discuss the collection of additional samples in the future.

The current drinking water standard for perchlorate is 24 ug/L. Based on the results of the perchlorate analysis for Stangl #2, this water could present a human health risk if it was
used as a source of drinking water. The drinking water standards are for the exposure pathway of water ingestion only.

Potential health risks associated with other uses of the contaminated water, such as using it for raising birds that will be hunted and ingested, are unknown at this time. However,

Thiokol has begun work on a risk assessment that will evaluate the human health risk associated with existing exposure pathways like the one described above. The results of the risk
assessment should be available sometime next year. Thiokol will be required to take corrective action for contaminated groundwater based on the results of the risk assessment.

Your cooperation in this matter is appreciated. If you have any questions, please contact Jeff Vandel at [phone].

Sincerely,

ORIGINAL DOCUMENT SIGNED BY DENNIS R. DOWNS ON 6/17/05

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

DRD/JV/ts

c: Paul Hancock, Manager, Environmental Remediation, ATK Thiokol Inc.
Lloyd C. Berentzen, MBA, Health Officer, Bear River Health Dept.

file: ATK Thiokol Inc. - Promontory

June 17, 2005

Page 2

June 17, 2005

TN200500825.doc
288 North 1460 West • PO Box 144880 • Salt Lake City, UT 84114-4880 • phone [phone] • fax [phone]
T.D.D. [phone] • www.deq.utah.gov

State of Utah

Department of Environmental Quality

Dianne R. Nielson, Ph.D.
Executive Director

DIVISION OF SOLID AND HAZARDOUS WASTE
Dennis R. Downs
Director

JON M. HUNTSMAN, JR.
Governor

GARY HERBERT
Lieutenant Governor