DSHW-2003-006194 - 0901a0688015759f

ATK
ALLIANT TECHSYSTEMS
Thiokol Propulsion Corp. Tel 435 8B3-3511
P.O. Box 707 Fax [phone]
Brigham City, UT 84302-0707
20 August 2003
8200-FY04-ST035
Scott Anderson, Hazardous Waste Brancli Manager •« C V-/ fc I V t L
Division of Solid and Hazardous Waste
Departnnent of Environmental Quality AUG 22 '^OO.'j
P. O. Box 144880 nw.iftn'^K-i'^-'H?'^ /
Salt Lake City, Utah 84114-4880 '^KiS o^T^"'"°^ ^"^*
Dear Mr. Anderson
Subject: Proposed Locations for Groundwater Monitoring Wells, ATK Thiokol
Propulsion - Promontory Facility, # UTD009081357
ATK Thiokol Propulsion met with Mr. Jeff Vandel and Mr. Helge Gabert of your staff on
August 7 and 18 to discuss the needs to install additional monitor wells to further
Characterize our groundwater plumes. We propose to construct six or possibly eight
wells depending on sampling results from the wells following installation. The
proposed locations of these wells are illustrated on enclosed Figure 1.
Two wells will be installed about 700 feet upgradient of Pipe Spring, which is
contaminated with perchlorate and trichloroethene. If these wells intercept
contamination in the fractured media above the spring, they will serve to provide
information in advance of the plume migrating towards the spring.
A third well will be constructed adjacent to existing well Ml 14-81. This well will be
drilled deeper than the existing well, to determine if the regional water exists in this
area. The target elevation for this well is approximately 4260', and is expected to
penetrate more than one perched aquifer. Great care will be taken to case and seal
the boring at each aquifer interval, but on occasion, seals in fractured media are not
adequate, and aquifer constituents including contaminated media migrate
uncontrollably.
A fourth well will be installed about 1000 feet east of existing well TCC2, to
determine the aquifer existence and properties on the eastern edge of the facility.
The fifth well will be installed about 800 feet north of existing well M39-B1, and will
provide information concerning migration of perchlorate from a suspected historical
source area at the M115 washout facility.
The sixth well will be installed downgradient of the trichloroethene plume on the north
Proposed Locations for Groundwater Monitoring Wells
ATK Thiokol Propulsion - Promontory Facility, # UTD009081357
20 August 2003 Page 2
end of the facility near building M-508, and will monitor extension of this plume
towards regional water reported in wells TCC8 and LF-4. Seventh and eighth wells
may be installed adjacent to the sixth, dependent upon the results obtained from
installation of the sixth well. These two are not illustrated on Figure 1 because exact
placement is not currently known.
If you have questions or need additional information, please call John Holladay at
863-6895.
Sincerely
"'T^.J^ IQ^MJL6C^=^
P. V. Hancock, Manager
Environmental Remediation
Enclosures:
PRDPnSED WELL LDCATIDN
t
^
maim vC
"g'*" H>
^r I— P*" iwaiig w
^
^
^
»" liSB Bgipz ^A
""""g ^
W pM pfi IF"*** p
n"" 1'*^ ngqi
IftMB • »&
pa iiffiT'Hr' ^
F> pm ngqM:
I**!*' jMa
PROPOSED WELL LOCATIONS
AND
PIEZIDMETRIC SURFACE MAP
snoNG ana, swrr i or t
rmr VK
•OB • imr (j> 'cpMtUoc03.#iQ
4837'
PROPOSED WELL LOCATION
R ^A
SE
^
-»—
mx:
PE 'n^** I*
qiffi aL-|M-
^
^
^
a:
sa
^
IZIjlBi 1^^ jWMJH
^
£
BBBCJHI
Urn \mm ^MZi IBIBPK
|MIM [•
^A
^
^
IBE ™ |i»
irww
PROPOSED WELL LOCATIONS
AND
PIEZIOMETRIC SURFACE MAP snoNG lao, SWET e IF s
TWM ma nani far
OD - Mr prevtltocO^^u