DSHW-2011-008688 - 0901a06880274c46

April 4, 2011

David P. Gosen, P.E.
Director, Environmental Services
ATK Launch Systems – Promontory
P.O. Box 707
Brigham City, UT 84302-0707

RE: Spring 2011 Groundwater Monitoring Plan
ATK Launch Systems - Promontory Facility
UTD009081357

Dear Mr. Gosen:

The Division of Solid and Hazardous Waste has completed its review of ATK’s Spring 2011 Groundwater Monitoring Plan and has communicated with your staff on the list of wells that will
be sampled this spring. The list of wells that ATK has proposed to sample appears adequate for monitoring the major source area at M-136 and the down-gradient perimeter of the contamination
plume.

The Division is currently evaluating the investigation of three SWMUs located at the north end of the facility at Buildings E-515, E-519 and M-585 (SWMUs #326, #503 and #227 respectively).
These SWMUs are located near the northern regional source area at M-508 and the northern perched zone source area at M-585. To assist with the investigation of these SWMUs, the Division
has requested that certain northern area wells be added to the monitoring list for the spring of 2011. In response, ATK has agreed that wells P-1, P-2, P-6, P-7, P-8, P-9 and M508-2
will be added to the monitoring list. The Division agrees that wells G-7 and G-8 can be removed from the spring sampling plan.

In accordance with Post-Closure Permit Condition IV.B.3, ATK’s monitoring plan for spring 2011 with the changes as discussed above is hereby approved. Thank you for your cooperation.
If you have any questions, please contact Jeff Vandel at [phone].

Sincerely,

ORIGINAL DOCUMENT SIGNED BY SCOTT T. ANDERSON ON 4/4/2011

Scott T. Anderson, Executive Secretary
Utah Solid and Hazardous Waste Control Board

STA\JV\tjm

c: Paul Hancock, ATK Launch Systems
Allen Lee, ATK Launch Systems
Lloyd Berentzen, MBA, Health Officer, Bear River Health Department

TN201100360 2

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
TN201100360 Printed on 100% recycled paper

Solid and Hazardous Waste Control Board
Kevin Murray, Chair
Kory Coleman, Vice-Chair
Michael D. Brehm, P.E.
Scott Bruce
Carlton Christensen
Jeff Coombs, MPH, LEHS
R. Ryan Dupont, Ph.D.
Larry A. Ellertson

Brad Mertz
Gary Mossor
John D Newman
Dennis Riding
Amanda Smith
Scott T. Anderson
Executive Secretary

State of Utah

GARY HERBERT
Governor

GREG BELL
Lieutenant Governor

Department of Environmental Quality

Amanda Smith
Executive Director

DIVISION OF SOLID AND HAZARDOUS WASTE
Scott T. Anderson
Director