DSHW-1999-005074 - 0901a06880157479

DEPARTMENT OF ENVIRONMENTAL QUALITY lILt UUri
DIVISION OF SOLID AND HAZARDOUS WASTE
Michael O. Leavitt 'i
Governor
Dianne R. Nielson, Ph.D. ;
Executive Director •'
Dennis R. Downs
Direcior
288 North 1460 West
P.O. Box 144880
; Sah Lake City. Uiah 84114-4880
[phone]
'- [phone] Fax
, [phone] T.D.D.
www.deq.state.ut.us Web
September 15, 1999
Mr. Joe D. Thompson, Director
Environmental, Fire and Security
Thiokol Corporation
P.O. Box 707
Brigham City, UT 84302-0707
RE: Class 3 Post-Closure Permit Modification #MOD99.03255
EPA LD. #UTD009081357
Dear Mr. Thompson:
This letter is in reply to your request to modify ground water monitoring requirements that are
established in Thiokol's Post-Closure Permit. The requested modification includes suspending
the requirement to sample for the constituents contained in List 3 of the Permit, and to reduce the
number of samples collected from the compliance point wells (for List 1 constituents) from four
to one semiannually. These ground water monitoring requirements have been reviewed and
discussed with Thiokol staff members, and it appears that, as mentioned in your letter, sampling
other down gradient wells would be a better utilization of resources.
The statistical test that requires four replicate samples from each well is not recommended by the
Division of Solid and Hazardous Waste, and therefore the semiannual collection and analysis of
four samples from each well is not required. In addition, based on the List 3 analytical results for
ground water samples collected from compliance wells in the years 1989, 1990, 1991, 1993 and
1996, it appears that there has not been a release of any List 3 constituents to the groundwater.
Continued analysis of these constituents every three years does not appear to be necessary.
Since the requested changes to the Post-Closure Permit constitutes a Class 3 Modification,
Thiokol must conduct a public information meeting and 60-day comment period. According to
your letter, a notice regarding the permit modification, public information meeting, and 60-day
comment period was published in local newspapers on August 18, 1999. Thiokol is also required
to notify the facility mail list ofthe requested modification, and submit a $1,000 fee to the Utah
Solid and Hazardous Waste Control Board. These requirements must be met by Thiokol
immediately.
r-
September 15, 1999
Page 2
After the conclusion of the 60-day comment period on October 17, 1999, the Division will
prepare a draft of the section of the Post-Closure Permit to be modified, and will conduct a public
hearing and 45-day comment period. The requested modification can not be approved, or denied,
until the 45-day comment period has concluded. If you have any questions regarding this letter,
please contact Jeff Vandel at 538-9413.
Sincerely,
^
Dennis R. Downs, Executive Secretary
Utah Solid and Hazardous Waste Control Board
DRD\JCV\kg
John C. Bailey, M.D., M.S.P.H., Hlth Officer/Dept.Director, Bear River District Hlth
Dept.
f:\...\jvandel\wp\thiokol\pcmod999.wpd
file to; Thiokol