DSHW-2016-004925 - 0901a068805fe0be

DSHW-2016-004925 195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

GARY R. HERBERT
Governor

SPENCER J. COX
Lieutenant Governor
Department of
Environmental Quality

Alan Matheson
Executive Director

DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Scott T. Anderson
Director

February 19, 2016

George Gooch, Manager
Environmental Services
ATK Launch Systems – Promontory
P.O. Box 707
Brigham City, UT 84302-0707

RE: Additional Investigation, Solid Waste Management Unit #553
ATK Launch Systems – Promontory Facility
UTD009081357

Dear Mr. Gooch:

The Division of Waste Management and Radiation Control has completed its review of ATK’s initial
RFI Report and the additional work conducted in July of 2015 on the investigation of SWMU #553
located at Building M-19A.

Based on the results of the samples collected at the site, the concentrations of constituents of concern
increase with depth. In addition, the highest concentration of silver was detected at the furthest point
sampled away from the discharge point. Although the concentrations of constituents detected are below
risk-based residential screening levels, it appears that higher concentrations may exist below and beyond
the points that have been sampled. Therefore, an approval for no further action can’t be given based on
the existing analytical results. Additional data is needed in order to define the extent of contamination at
the site.

Please submit a sampling plan to the Division for collecting additional samples at the site to demonstrate
the extent of contamination at depth and distance from the discharge point in the drainage channel. In
addition, please be aware that the residential screening level for hexavalent chromium in soil is 0.3
mg/kg. The hexavalent chromium sample results that were submitted were below detection with a
method detection limit of 2.1 mg/kg. A lower detection limit is needed to show that contamination is
not present at the site at levels over the residential screening level.

(Over)
If you have any questions, or would like to discuss the sampling plan, please call Jeff Vandel at
[phone].

Sincerely,

Scott T. Anderson, Director
Division of Waste Management and Radiation Control

STA/JV/jr

c: Paul Hancock, ATK Launch Systems
Lloyd C. Berentzen, MBA, Health Officer, Bear River Health Department
Grant Koford, EHS, Environmental Health Director, Bear River Health Department
Moye Lin, EPA Region VIII