DSHW-2003-007889 - 0901a06880160471

October 27, 2003

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

RE: Closure of Waste Motor Storage Buildings, ATK Thiokol Propulsion – Promontory,
EPA I.D. #UTD009081357

Dear Mr. Gooch:

This letter is in response to your correspondence dated September 15 and October 2, 2003 regarding the closure of three waste motor storage buildings and the revision of the ATK Thiokol
Propulsion – Promontory (Thiokol) Closure Plan. The Division of Solid and Hazardous Waste (the Division) agrees with your proposal to complete the closure of storage buildings M-107,

M-340 and S-616 before re-writing the Closure Plan. The plans for closing these buildings were written and approved in January 1999 and are still appropriate. Please be advised that
your request for a waiver from the requirement for certification of closure by an independent professional engineer for these buildings cannot be approved. The Hazardous Waste Management
Rules do not contain provisions for such a waiver.

Once closure is complete, the Storage Permit will need to be modified to remove all references to the closed buildings. This will require a Class 1 Modification, at the request of the
permittee, with prior approval from the Executive Secretary. The Division requests that Thiokol submit its permit modification request, as outlined in 40 CFR §270.42(a), after the Division
has verified the closure certification. In addition, Thiokol can discontinue providing financial assurance for buildings M-107, M-340 and S-616 once the verification of closure from
the Division is received.

It is requested that Thiokol submit its revised Closure Plan for the other regulated units at Promontory to the Division within 45 days of receiving the closure verification letter.
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 10/27/03

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

DRD\jv\kk

c: John C. Bailey, M.D., M.S.P.H., Health Officer/Director, Bear River Health Dept.
Eric Johnson, EPA, Region VIII

TN200302203.doc
File to: ATK Thiokol Propulsion – Promontory

October 27, 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