DSHW-2018-007704 - 0901a0688089b84f

Div of Waste Management
and Radiation Control
AUG 0 3 2018
NORTHROP GRUMMAN
August 3, 2018
8200-FY18-19
Mr. Scott T. Anderson, Director
Utah Department of Environmental Quality
Division of Waste Management and Radiation Control
195 North 1950 West
P.O. Box 144880
Salt Lake City, Utah 84114-4880
D'SWA4o ( 0 — 00-11o4 Northrop Grumman orporation
Innovation Systems
ATK Launch Systems Inc.
P O. Box 707
Brigham City, UT 84321-0707
Re: ATK Launch Systems Inc., Updated Groundwater Flow and Contaminant Transport
Report for the Promontory Facility, Promontory EPA ID #UTD009081357 1-----
Dear Mr. Anderson:
Included with this letter is an updated groundwater flow and contaminant transport report
for the Promontory facility. This report has two components, one consists of the additional
modeling discussed in section 4.3.1 of the approved Promontory Thermal Treatment Units
Groundwater Monitoring Plan. This effort was to use the model to estimate the perchlorate
mass in the groundwater at M-136 and make predictions and assumptions based on
increasing and decreasing values seen at the wells.
The second component was a recalibration of the contaminant transport model as values
predicted in pipe spring were much higher that actual concentrations.
EarthFax provided a CD containing the electronic files for this modeling previously to
Helge Gebert.
If you have questions regarding this report, please contact Paul Hancock at [phone].
Kris H. Blauer
Manager, Environmental Services
ATK Launch Systems, Inc.
Updated Groundwater Flow and
Contaminant Transport Model of the
ATK Promontory, Utah Facility
ATK Launch Systems
Promontory, Utah Facility
July 2018
rri"—Z1
EarthFax EarthFax Engineering Group, LLC
iii
Engineers / Scientists
www.earthfax.com
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
TABLE OF CONTENTS
Section Page
CHAPTER 1 - INTRODUCTION 1
1.1 BACKGROUND 1
1.2 HYDROGEOLOGIC SETTING 2
1.3 OBJECTIVES 2
CHAPTER 2 - MODEL RESULTS 3
2.1 M-136 PERCHLORATE MASS ESTIMATION 4
2.2 CONTAMINANT TRANSPORT MODEL RECALIBRATION 5
2.3 PREDICTED CONCENTRATIONS 6
CHAPTER 3 - REFERENCES 7
LIST OF FIGURES
Figure, Page
1. Monitoring Wells at M-136 8
2. Estimated Perchlorate Mass in Groundwater at M-136 9
3. Perchlorate Concentration in Wells A-5, A-8, C-1, and C-3 10
4. Perchlorate Concentration in Wells D-4 and D-5 11
5. Average Predicted Perchlorate Concentration 12
6. Average Predicted TCE Concentration 13
LIST OF APPENDICES
Appendix A - Perchlorate Mass Calculations
Appendix B - Predicted Perchlorate and TCE Concentrations
ii EarthFax Engineering Group, LLC
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
UPDATED GROUNDWATER FLOW AND
CONTAMINANT TRANSPORT MODEL OF THE
ATK PROMONTORY, UTAH FACILITY
CHAPTER 1
INTRODUCTION
1.1 BACKGROUND
ATK Launch Systems ("ATK") and its predecessors have operated a rocket motor
manufacturing and testing facility since 1957 at the Promontory facility, located about 70 miles
northwest of Salt Lake City, Utah and 25 miles northwest of Brigham City, Utah. Extensive
investigations of soil and groundwater contamination at the Promontory facility have indicated
the occurrence of perchlorate and chlorinated solvents in soil and groundwater beneath the site.
One of the primary locations at the Promontory facility for the disposal of waste
energetics has historically been (and continues to be) the M-136 burning ground. The design
and operation of M-136, which is regulated by the Utah Division of Waste Management and
Radiation Control ("DWMRC"), has been modified over the past several years to minimize the
potential for additional contributions to soil and groundwater contamination from this site.
However, since ATK has ongoing treatment operations at M-136, DWMRC has expressed
concern that operations at the burning ground may be contributing ongoing perchlorate
contamination to underlying groundwater.
To assist in determining the fate of groundwater contaminants in the area and to provide
a basis from which future remediation decisions could be made, ATK contracted with EarthFax
Engineering (2005) to prepare a groundwater flow and contaminant transport model of the
Promontory facility. Groundwater flow was modeled using Visual MODFLOW, a finite-difference
model developed by the U.S. Geological Survey. Contaminant transport was modeled using
MT3DMS, a modular, three-dimensional model for the simulation of advection, dispersion, and
chemical reaction of dissolved constituents in groundwater. Operational versions of the model
1 EarthFax Engineering Group, LLC
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
were obtained from Waterloo Hydrogeologic. This model has been updated since 2005 to
account for new data and changing conditions at the site.
1.2 HYDROGEOLOGIC SETTING
Groundwater beneath M-136 occurs in highly faulted and fractured limestone at a depth
of approximately 300 feet. Geologic structures in the area include thrust faults, high-angle
normal faults, and low-angle normal faults (Miller et al., 1991). Given the extensive faulting and
folding as well as the associated fracturing of bedrock, hydrogeologic conditions in the area are
complex. North-south and east-west trending faults and fractures in the region appear to have a
significant influence on groundwater flow and contaminant migration. Furthermore, faulting and
the presence of low-permeability unconsolidated deposits have resulted in the creation of
barriers to groundwater flow in areas where less permeable units exist adjacent to more
permeable units. These conditions have combined to substantially decrease the slope of the
potentiometric surface in the vicinity of M-136 relative to that in adjacent areas immediately up-
and downgradient from the burning ground.
1.3 OBJECTIVES
The purpose of this report is to present the results of efforts to update the Promontory
groundwater flow and contaminant transport model. In particular, although this update
addressed groundwater flow and contaminant transport conditions throughout the Promontory
facility, at the request of DWMRC it focuses on groundwater beneath and immediately adjacent
to the M-136 burning ground. The primary purpose of this update is to address the following
objectives:
• Estimate the historic mass of perchlorate in groundwater beneath and adjacent to M-136
to aid in determining if additional perchlorate is being added to groundwater as a result
of current M-136 operations; ,
• Recalibrate the model in the area of Pipe Springs (located about 4.0 miles south-
southeast of M-136) so the model will more accurately predict perchlorate
concentrations in that area (which are approximately one order of magnitude lower than
predicted by previous models); and
2 EarthFax Engineering Group, LLC
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
• Estimate future trends in perchlorate concentrations in the M-136 area and at the
Promontory facility as a whole.
Investigations at the Promontory facility have shown that groundwater in some areas
along the east side of the facility is perched above the regional groundwater system. Several
years ago, DWMRC requested that the perched aquifer be combined with the regional aquifer in
the model. The agency has recently indicated that they are now comfortable with the model
showing separate aquifers if needed to provide better predictive results. This current model
update was performed with the separate aquifers in mind.
3 EarthFax Engineering Group, LLC
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
CHAPTER 2
MODEL RESULTS
2.1 M-136 PERCHLORATE MASS ESTIMATION
The locations of monitoring wells in the vicinity of the M-136 burning ground are noted
on Figure 1. The estimated mass of perchlorate in groundwater beneath and immediately,
adjacent to M-136 for the years 2007 through 2017 is presented in Appendix A and summarized
in Figure 2. As indicated, it is estimated that the total mass of perchlorate in groundwater
beneath and adjacent to M-136 has increased since at least 2007 (the earliest year included in
this analysis). However, the trend lines indicate that the rate of mass increase since 2012 has
decreased substantially relative to the rate prior to that year (increasing at a rate of about 4,500
kg per year since 2012 compared to 14,700 kg per year prior to 2012).
Historic data collected at the Promontory facility indicate that perchlorate contamination
of groundwater at the site is widespread, with M-136 being a major (although not the only)
source of this contamination. Data summarized in Figures 3 and 4 indicate that perchlorate
concentrations have been increasing in some M-136 monitoring wells, decreasing in others, and
fluctuating around near-stable levels in still others. Although perchlorate is highly soluble in
water, the thickness (approximately 300 feet) of the unsaturated zone at M-136 results in a
substantial delay in the time required for perchlorate to migrate from the surface to groundwater
at this site. This delay, plus the presence of other sources of perchlorate contamination at the
facility, makes it difficult to determine if additional perchlorate is being added to groundwater as
a result of current M-136 operations. However, taking these factors into account and the
decline in the rate at which the estimated mass of perchlorate has been increasing for the past
six years, it appears that ongoing operations at M-136 are not likely contributing additional
perchlorate to groundwater. This conclusion was verified through previous modeling of flow in
the unsaturated zone beneath M-136 (see EarthFax Engineering, 2011 and 2013).
4 EarthFax Engineering Group, LLC
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
2.2 CONTAMINANT TRANSPORT MODEL RECALIBRATION
The ATK Promontory groundwater model was recalibrated based on the most-recent
perchlorate and trichloroethylene ("TCE") concentration data to simulate contaminant migration
in groundwater beneath and downgradient of the Promontory facility. Special attention was paid
to more-accurately predicting perchlorate concentrations at springs located at the south end of
the Blue Spring Hills, since discharge from these springs is uncontrolled and flows to off-site
areas. The recalibrated model was then used to predict contaminant concentrations at 10-year
intervals for a period of 30 years, thereby providing a tool to assist decision-makers in
evaluating the efficacy of on-site remediation alternatives and off-site resource management.
Perchlorate and TCE concentrations measured in groundwater in 2017 at 52 and 55
locations, respectively, were used in the recalibration process. During recalibration, perchlorate
and TCE were assumed to enter the model with new constant concentration values at source
zones from 2008 (which is the last calibration time) to 2017. The previously-calibrated steady-
state potentiometric surface and hydraulic conductivity were modified as needed with the goal of
reaching the following calibration targets for the contaminant transport model:
• Mean average error<1.00 mg/L
• Normalized root mean square error<5.0%
• Mass balance error<1.0%
The Mean Average Errors for the calibrated transport model are 0.788 mg/I and 0.131
mg/L for perchlorate and TCE, respectively. In addition, the Normalized Root Mean Square
errors for the calibrated model are 0.37% of perchlorate and 1.67% for TCE. The Mass Balance
Errors are 0.00% and 0.01% for the perchlorate and TCE models, respectively. Thus, the
above calibration criteria were all met.
One of the purposes of the model recalibration was to more accurately predict the
concentrations of perchlorate and TCE at Pipe Springs. The updated model-calibrated
perchlorate concentration at Pipe Springs is 473 ug/L compared with the most recent measured
5 EarthFax Engineering Group, LLC
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
perchlorate concentration of 491 ug/L at this source. Similarly, the modeled TCE concentration
at Pipe Springs is 17 ug/L while the corresponding observed TCE concentration at that location
is 11 ug/L. These values are in reasonable agreement.
2.3 PREDICTED CONCENTRATIONS
Simulated future perchlorate and TCE concentrations are presented in Appendix B.
These projections are based on two alternative scenarios:
1. Alternative 1: Full and instantaneous remediation of all source areas
2. Alternative 2: No remediation of or continued contaminant input at any source area
These alternatives bound the range of potential source remedial action scenarios. However,
they do not consider intra-plume remediation (i.e., active remediation at points within the
plume(s) but downgradient from the sources).
Figures 5 and 6 present average predicted perchlorate and TCE concentrations,
respectively, in groundwater at all monitored points at the Promontory facility. This provides a
broad summary of the efficacy of remedial actions under the two alternatives. As indicated,
concentrations of perchlorate and TCE under Alternative 1 are expected to decline relatively
rapidly throughout the facility to about 27% to 33% of their current levels (on average),
respectively, over the first 10 years following remediation. Thereafter, it is predicted that the
rate of concentration decline will decrease.
Under Alternative 2, it is anticipated that concentrations of perchlorate and TCE will
gradually increase over the next 30 years as the contaminants are flushed out of the
unsaturated zone into the groundwater.
6 EarthFax Engineering Group, LLC
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
CHAPTER 3
REFERENCES
EarthFax Engineering. 2005. Groundwater Flow and Contaminant Transport Model Report for
the ATK Promontory Facility. Project report prepared for ATK Launch Systems.
Revised January 2006. Midvale, Utah.
EarthFax Engineering. 2011. Infiltration Modeling at the M136 and M225 Areas of the ATK
Promontory Facility Utilizing HYDRUS. Project report prepared for ATK Space Launch
Systems. Midvale, Utah.
EarthFax Engineering. 2013. Appropriateness of HYDRUS to Model Flow in the Unsaturated
Zone at M136. Letter from Richard B. White to Paul Hancock. Midvale, Utah.
Miller, D.M., M.D. Crittenden, and T.E. Jordan. 1991. Geologic Map of the Lampo Junction
Quadrangle, Box Elder County, Utah. Map 136. Utah Geological Survey. Salt Lake
City, Utah.
7 EarthFax Engineering Group, LLC
1
8
1
0:
28
:
35

A
M

FIGURE 1. MONITORING WELLS AT M-136
G:
\UC1
02
3
\
15 \
FI
G
U
R
E

1
—

M
-
13
6
.
d
300,000
250,000
ES
T
I
M
A
T
E
D

M
A
S
S

(
KG)

200,000
150,000
100,000
50,000
0
2006
YEAR .••••=
ANk .01,4Mh. f MI 1 FIGURE 2. ESTIMATED PERCHLORATE MASS IN GROUNDWATER AT M-136

EarthFax
2008 2010 2012 2014 2016 2018
45,000
40,000
35,000
10,000
01/01/00 01/01/04 01/01/08 01/01/12 01/01/16 01/01/20
Date
•••••••A-5 ..A-8 C-1 •.••).(-- C-3
FIGURE 3. PERCHLORATE CONCENTRATION IN WELLS A-5, A-8, C-1, AND C-3.
1/1/2015 1/1/2019 1/1/2007 1/1/2011
Date
—•—• D-4 D-5
FIGURE 4. PERCHLORATE CONCENTRATION IN WELLS D-4 AND D-5.
300,000
250,000
:7 200,000
o 150,000
a)
0 100,000
50,000
z
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
Av
e
ra
g
e C
o
nc
e
ntr
a
tio
n (
u
g
/L)

30 5 10
Alternative 1 i—•--
15
Years
CONCENTRATION
)
FIGURE
20
—4116— Alternative 2
25
411•••11•110. .•••• 101•111MI• AMMIIIM=1
I IVINI.111 1 II 1111 . ■ L\NaPIU ....._—...... 5. AVERAGE PREDICTED PERCHORATE EarthFax
CAv
e
ra
g
e o
nc
e
ntr
a
tio
n

(
u
g
/L)

1,000
900
800
700
600
500
400
300
200
100
0
INN
0 5 10 15 20 25 30
Yea rs
—6—Alternative 1 —II—Alternative 2 MOW INOMMI NEM r Arm. I 1111
EarthFax
FIGURE 6. AVERAGE PREDICTED TCE CONCENTRATION
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
APPENDIX A
Perchlorate Mass Calculations
EarthFax Engineering Group, LLC
ATK LAUNCH SYSTEMS - PROMONTORY, UTAH FACILITY
GROUNDWATER FLOW AND CONTAMINANT TRANSPORT MODEL
DETERMINATION OF CELL VOLUME FOR CALCULATION OF PERCHLORATE MASS
Individual cell cross sectional area = 200 ft x 200 ft
Six model layers:
Layer
Number
Avg Elev
(ft)
Thickness
(ft)
Contami-
nated GW?
Surface 4562.2
1 4561.2 1 N
2 4480.2 81 Y
3 4030.7 449.5 Y
4 4012.3 18.4 Y
5 3995 17.3 N
6 3800 195 N
548.9 ft (Thickness of layers containing
contaminated GW)
621,723,661 liters Cont. cell volume = 21,956,000 ftA3 =
Effective porosity = 0.1
Vol of contaminated GW in each cell = 62,172,366 liters
Conversion factor = 0.0621724 (to convert perchlorate concentration in ug/L to
kg of perchlorate in an individual cell)
CELL NUMBERING SEQUENCE USED
TO CALCULATE PERCHLORATE MASS
'isea :'neturnen s an. e met c eng rOmOn-irri mersCN7(16.5.?.113 '-datelPei'ehlroraiei hiokoi vrn'T Vuitr07
File Grkl Was Properties Bastdarles Particles ZBud Tools Help
yew Column
View Row View L ver PrewoUs
•=li t,
0oto Next
Z one Budget
Assicn a a DatebeSe Observations rriali --41.n. < •... nie.
A
IIIII---* CI
20
oli .1.
Ell <
Alir_l 5.
- -EIEL
ID *—ga
x: 1744776.6 X : 494659.7 Z : 4170.2 Row (1): 117 Column (3): 69 Layer (K): 3 2.. F6 2. F7 EA, t Law., n S out [Wan Pi]..aci /May
2007 PERCHLORATE DATA
Estimated concentrations determined by linear interpolation.
I n put Perchlorate Concentration Data (ug/L): (Measured values in black. Estimated values in
Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L)
A-3 A-5 3,340 A-6 A-8
C-1 14,900 C-3 7,950
D-1 D-2 D-4 112,000 D-5 174,000 D-6 48, 844
Estimated Average Perchlorate Concentration (ug/L) in Each Cell
Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc.
1 58,034 11 89,748 21 72,998 31 163 41 3,340 51 70,080 61 33,822
2 29,712 12 67,496 22 123,499 32 0 42 2,040 52 71,967
3 0 13 45,244 23 174,000 33 22,497 43 739 53 59,882
4 402 14 22,991 24 139,608 34 52,332 44 68,192 54 46,330
5 804 15 739 25 105,216 35 82,166 45 84,053 55 32,779
6 0 16 789 26 70,824 36 112,000 46 85,941 56 40,811
7 22,497 17 838 27 36,432 37 90,268 47 68,299 57 38,884
8 52,332 18 888 28 2,040 38 68,536 48 50,657 58 36,958
9 82,166 19 937 29 1,414 39 46,804 49 48,844 59 51,951
10 112,000 20 22,497 30 789 40 25,072 50 36,958 60 52,895
Estimated Perchlorate Mass (kg) in Each Cell
Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass
1 3,608 11 5,580 21 4,538 31 10 41 208 51 4,357 61 2,103
2 1,847 12 4,196 22 7,678 32 0 42 127 52 4,474
3 0 13 2,813 23 10,818 33 1,399 43 46 53 3,723
4 25 14 1,429 24 8,680 34 3,254 44 4,240 54 2,880
5 50 15 46 25 6,542 35 5,108 45 5,226 55 2,038
6 0 16 49 26 4,403 36 6,963 46 5,343 56 2,537
7 1,399 17 52 27 2,265 37 5,612 47 4,246 57 2,418
8 3,254 18 55 28 127 38 4,261 48 3,149 58 2,298
9 5,108 19 58 29 88 39 2,910 49 3,037 59 3,230
10 6,963 20 1,399 30 49 40 1,559 50 2,298 60 3,289
Estimated mass summed by column:
22,254 15,678 45,188 31,076 27,919 31,244 2,103
Total estimated mass (all columns) = 175,462 kg
2008 PERCHLORATE DATA
Estimated concentrations determined by linear interpolation.
Input Perchlorate Concentration Data (ug/L): (Measured values in black. Estimated values in
Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L)
A-3 1,390 A-5 2,310 A-6 23,100 A-8 7,190
C-1 13,800 C-3 9,370
D-1 1,013 D-2 D-4 115,000 D-5 206,000 D-6
Estimated Average Perchlorate Concentration (ug/L) in Each Cell
Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc.
1 64,888 11 92,152 21 84,067 31 447 41 2,310 51 71,811 61 34,143
2 33,017 12 69,304 22 145,033 32 0 42 1,535 52 73,651
3 0 13 46,455 23 206,000 33 23,100 43 759 53 61,095
4 278 14 23,607 24 165,107 34 53,733 44 69,970 54 46,802
5 556 15 759 25 124,214 35 84,367 45 86,207 SS 32,508
6 0 16 810 26 83,321 36 115,000 46 88,048 56 40,714
7 23,100 17 861 27 42,428 37 92,462 47 69,632 57 38,799
8 53,733 18 911 28 1,535 38 69,924 48 51,216 58 36,884
9 84,367 19 962 29 1,172 39 47,386 49 48,921 59 52,977
10 115,000 20 23,100 30 810 40 24,848 50 36,884 60 53,897
Estimated Perchlorate Mass (kg) in Each Cell
Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass
1 4,034 11 5,729 21 5,227 31 28 41 144 51 4,465 61 2,123
2 2,053 12 4,309 22 9,017 32 0 42 95 52 4,579
3 0 13 2,888 23 12,808 33 1,436 43 47 53 3,798
4 17 14 1,468 24 10,265 34 3,341 44 4,350 54 2,910
5 35 15 47 25 7,723 35 5,245 45 5,360 55 2,021
6 0 16 50 26 5,180 36 7,150 46 5,474 56 2,531
7 1,436 17 54 27 2,638 37 5,749 47 4,329 57 2,412
8 3,341 18 57 28 95 38 4,347 48 3,184 58 2,293
9 5,245 19 60 29 73 39 2,946 49 3,042 59 3,294
10 7,150 20 1,436 30 50 40 1,545 50 2,293 60 3,351
Estimated mass summed by column:
23,311 16,098 53,076 31,787 28,318 31,654 2,123
Total estimated mass (all columns) = 186,366 kg
2011 PERCHLORATE DATA
Estimated concentrations determined by linear interpolation.
Input Perchlorate Concentration Data (ug/L): (Measured values in black. Estimated values in )
Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L)
A-3 A-5 9,360 A-6 21,000 A-8 10,837
C-1 20,800 C-3 14,123
D-1 1,200 D-2 917 D-4 139,000 D-5 244,000 D-6 104,000
Estimated Average Perchlorate Concentration (ug/L) in Each Cell
Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc.
1 78,417 11 111,383 21 95,333 31 0 41 9,360 51 85,469 61 42,878
2 40,722 12 83,767 22 169,667 32 0 42 5,139 52 89,116
3 0 13 56,150 23 244,000 33 21,000 43 917 53 74,919
4 525 14 28,534 24 196,228 34 60,333 44 81,823 54 58,917
5 1,049 15 917 25 148,455 35 99,667 45 103,313 55 42,915
6 0 16 974 26 100,683 36 139,000 46 106,959 56 73,457
7 21,000 17 1,030 27 52,911 37 113,072 47 85,994 57 71,551
8 60,333 18 1,087 28 5,139 38 87,144 48 65,029 58 69,644
9 99,667 19 1,143 29 3,056 39 61,216 49 104,000 59 64,174
10 139,000 20 21,000 30 974 40 35,288 50 69,644 60 65,997
Estimated Perchlorate Mass (kg) in Each Cell
Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass
1 4,875 11 6,925 21 5,927 31 0 41 582 51 5,314 61 2,666
2 2,532 12 5,208 22 10,549 32 0 42 319 52 5,541
3 0 13 3,491 23 15,170 33 1,306 43 57 53 4,658
4 33 14 1,774 24 12,200 34 3,751 44 5,087 54 3,663
5 65 15 57 25 9,230 35 6,197 45 6,423 55 2,668
6 0 16 61 26 6,260 36 8,642 46 6,650 56 4,567
7 1,306 17 64 27 3,290 37 7,030 47 5,346 57 4,448
8 3,751 18 68 28 319 38 5,418 48 4,043 58 4,330
9 6,197 19 71 29 190 39 3,806 49 6,466 59 3,990
10 8,642 20 1,306 30 61 40 2,194 50 4,330 60 4,103
Estimated mass summed by column:
27,400 19,024 63,195 38,343 39,304 43,282 2,666
Total estimated mass (all columns) = 233,214 kg
2012 PERCHLORATE DATA
Estimated concentrations determined by linear interpolation.
Input Perchlorate Concentration Data (ug/L): (Measured values in black. Estimated values in
Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L)
A-3 A-5 2,930 A-6 A-8
C-1 20,600 C-3
D-1 D-2 597 D-4 157,000 D-5 162,000 D-6 41,400
Estimated Average Perchlorate Concentration (ug/L) in Each Cell
Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc.
1 64,508 11 125,719 21 66,111 31 261 41 2,930 51 94,866 61 47,300
2 32,844 12 94,439 22 114,055 32 0 42 1,764 52 99,722
3 0 13 63,158 23 162,000 33 18,166 43 597 53 83,866
4 353 14 31,878 24 129,953 34 64,444 44 90,011 54 64,695
5 705 15 597 25 97,905 35 110,722 45 115,578 55 45,524
6 0 16 762 26 65,858 36 157,000 46 120,433 56 43,462
7 18,166 17 926 27 33,811 37 126,186 47 95,441 57 40,517
8 64,444 18 1,091 28 1,764 38 95,372 48 70,448 58 37,572
9 110,722 19 1,255 29 1,263 39 64,558 49 41,400 59 71,083
10 157,000 20 18,166 30 762 40 33,744 50 37,572 60 73,511
Estimated Perchlorate Mass (kg) in Each Cell
Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass
1 4,011 11 7,816 21 4,110 31 16 41 182 51 5,898 61 2,941
2 2,042 12 5,871 22 7,091 32 0 42 110 52 6,200
3 0 13 3,927 23 10,072 33 1,129 43 37 53 5,214
4 22 14 1,982 24 8,079 34 4,007 44 5,596 54 4,022
5 44 15 37 25 6,087 35 6,884 45 7,186 55 2,830
6 0 16 47 26 4,095 36 9,761 46 7,488 56 2,702
7 1,129 17 58 27 2,102 37 7,845 47 5,934 57 2,519
8 4,007 18 68 28 110 38 5,930 48 4,380 58 2,336
9 6,884 19 78 29 78 39 4,014 49 2,574 59 4,419
10 9,761 20 1,129 30 47 40 2,098 50 2,336 60 4,570
Estimated mass summed by column:
27,899 21,014 41,872 41,684 35,822 40,712 2,941
Total estimated mass (all columns) = 211,943 kg
2013 PERCHLORATE DATA
Estimated concentrations determined by linear interpolation.
input Perchlorate Concentration Data (ug/L): (Measured values in black. Estimated values in
Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L)
A-3 1,500 A-5 2,710 A-6 A-8 9,628
c-1 18,500 c-3 15,500
d-1 579 d-2 d-4 154,000 d-5 246,000 d-6 89,000
Estimated Average Perchlorate Concentration (ug/L) in Each Cell
Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc.
1 80,864 11 123,403 21 100,390 31 462 41 2,710 51 95,327 61 45,721
2 41,152 12 92,807 22 173,195 32 0 42 1,863 52 98,349
3 0 13 62,210 23 246,000 33 27,585 43 1,016 53 81,814
4 300 14 31,613 24 197,173 34 69,724 44 92,304 54 62,654
5 600 15 1,016 25 148,345 35 111,862 45 114,884 55 43,495
6 0 16 929 26 99,518 36 154,000 46 117,907 56 66,247
7 27,585 17 841 27 50,691 37 123,742 47 93,198 57 63,616
8 69,724 18 754 28 1,863 38 93,484 48 68,489 58 60,984
9 111,862 19 666 29 1,396 39 63,226 49 89,000 59 70,524
10 154,000 20 27,585 30 929 40 32,968 50 60,984 60 72,035
Estimated Perchlorate Mass (kg) in Each Cell
Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass
1 5,027 11 7,672 21 6,242 31 29 41 168 51 5,927 61 2,843
2 2,559 12 5,770 22 10,768 32 0 42 116 52 6,115
3 0 13 3,868 23 15,294 33 1,715 43 63 53 5,087
4 19 14 1,965 24 12,259 34 4,335 44 5,739 54 3,895
5 37 15 63 25 9,223 35 6,955 45 7,143 55 2,704
6 0 16 58 26 6,187 36 9,575 46 7,331 56 4,119
7 1,715 17 52 27 3,152 37 7,693 47 5,794 57 3,955
8 4,335 18 47 28 116 38 5,812 48 4,258 58 3,792
9 6,955 19 41 29 87 39 3,931 49 5,533 59 4,385
10 9,575 20 1,715 30 58 40 2,050 50 3,792 60 4,479
Estimated mass summed by column:
30,221 21,252 63,385 42,094 39,937 44,456 2,843
Total estimated mass (all columns) = 244,187 kg
2015 PERCHLORATE DATA
Estimated concentrations determined by linear interpolation.
input Perchlorate Concentration Data (ug/L). (Measured values in black. Estimated values in )
Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L)
A-3 A-5 4,160 A-6 A-8
c-1 15,500 c-3
d-1 830 d-2 305 d-4 148,000 d-5 232,000 d-6 67,300
Estimated Average Perchlorate Concentration (ug/L) in Each Cell
Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc.
1 76,761 11 118,461 21 90,645 31 0 41 4,160 51 89,697 61 42,819
2 39,015 12 88,922 22 161,322 32 0 42 2,233 52 93,505
3 0 13 59,383 23 232,000 33 19,967 43 305 53 77,880
4 430 14 29,844 24 186,047 34 62,645 44 85,888 54 59,184
5 860 15 305 25 140,093 35 105,322 45 109,131 55 40,488
6 0 16 410 26 94,140 36 148,000 46 112,940 56 53,894
7 19,967 17 515 27 48,186 37 119,232 47 89,208 57 52,004
8 62,645 18 620 28 2,233 38 90,464 48 65,476 58 50,114
9 105,322 19 725 29 1,321 39 61,696 49 67,300 59 66,258
10 148,000 20 19,967 30 410 40 32,928 50 50,114 60 68,162
Estimated Perchlorate Mass (kg) in Each Cell
Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass
1 4,772 11 7,365 21 5,636 31 0 41 259 51 5,577 61 2,662
2 2,426 12 5,528 22 10,030 32 0 42 139 52 5,813
3 0 13 3,692 23 14,424 33 1,241 43 19 53 4,842
4 27 14 1,855 24 11,567 34 3,895 44 5,340 54 3,680
5 53 15 19 25 8,710 35 6,548 45 6,785 55 2,517
6 0 16 25 26 5,853 36 9,202 46 7,022 56 3,351
7 1,241 17 32 27 2,996 37 7,413 47 5,546 57 3,233
8 3,895 18 39 28 139 38 5,624 48 4,071 58 3,116
9 6,548 19 45 29 82 39 3,836 49 4,184 59 4,119
10 9,202 20 1,241 30 25 40 2,047 50 3,116 60 4,238
Estimated mass summed by column:
28,164 19,842 59,461 39,806 36,480 40,486 2,662
Total estimated mass (all columns). 226,902 kg
2016 PERCHLORATE DATA
Estimated concentrations determined by linear interpolation.
input Perchlorate Concentration Data (ug/L): (Measured values in black. Estimated values in )
Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L)
A-3 1,740 A-5 5,390 A-6 A-8 8,410
c-1 16,800 c-3 38,600
d-1 d-2 d-4 169,000 d-5 227,000 d-6 88,000
Estimated Average Perchlorate Concentration (ug/L) in Each Cell
Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc.
1 80,186 11 135,279 21 92,637 31 0 41 5,390 51 103,003 61 48,558
2 40,915 12 101,558 22 159,818 32 0 42 2,893 52 106,854
3 0 13 67,837 23 227,000 33 25,455 43 395 53 88,705
4 348 14 34,116 24 182,179 34 73,303 44 99,153 54 67,212
5 696 15 395 25 137,357 35 121,152 45 125,002 55 45,719
6 0 16 450 26 92,536 36 169,000 46 128,853 56 66,859
7 25,455 17 506 27 47,714 37 136,278 47 101,745 57 64,958
8 73,303 18 561 28 2,893 38 103,556 48 74,637 58 63,056
9 121,152 19 616 29 1,672 39 70,834 49 88,000 59 75,780
10 169,000 20 25,455 30 450 40 38,112 50 63,056 60 77,706
Estimated Perchlorate Mass (kg) in Each Cell
Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass
1 4,985 11 8,411 21 5,759 31 0 41 335 51 6,404 61 3,019
2 2,544 12 6,314 22 9,936 32 0 42 180 52 6,643
3 0 13 4,218 23 14,113 33 1,583 43 25 53 5,515
4 22 14 2,121 24 11,326 34 4,557 44 6,165 54 4,179
5 43 15 25 25 8,540 35 7,532 45 7,772 55 2,842
6 0 16 28 26 5,753 36 10,507 46 8,011 56 4,157
7 1,583 17 31 27 2,966 37 8,473 47 6,326 57 4,039
8 4,557 18 35 28 180 38 6,438 48 4,640 58 3,920
9 7,532 19 38 29 104 39 4,404 49 5,471 59 4,711
10 10,507 20 1,583 30 28 40 2,370 50 3,920 60 4,831
Estimated mass summed by column:
31,774 22,803 58,707 45,864 42,844 47,242 3,019
Total estimated mass (all columns) = 252,252 kg
2017 PERCHLORATE DATA
Estimated concentrations determined by linear interpolation.
Input Perchlorate Concentration Data (ug/L): (Measured values in black. Estimated values in
Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L) Cell Conc (ug/L)
A-3 A-5 4,820 A-6 12,582 A-8 7,380
c-1 24,500 c-3 26,700
d-1 797 d-2 509 d-4 163,000 d-5 139,000 d-6 213,000
Estimated Average Perchlorate Concentration (ug/L) in Each Cell
Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc. Cell # Conc.
1 61,352 11 130,502 21 54,721 31 0 41 4,820 51 96,217 61 46,285
2 31,469 12 98,004 22 96,861 32 0 42 2,665 52 101,834
3 0 13 65,505 23 139,000 33 12,582 43 509 53 85,190
4 413 14 33,007 24 111,733 34 62,721 44 90,600 54 67,383
5 826 15 509 25 84,466 35 112,861 45 118,478 55 49,576
6 0 16 567 26 57,199 36 163,000 46 124,095 56 131,288
7 12,582 17 624 27 29,932 37 131,364 47 99,374 57 128,008
8 62,721 18 682 28 2,665 38 99,728 48 74,652 58 124,728
9 112,861 19 739 29 1,616 39 68,092 49 213,000 59 71,251
10 163,000 20 12,582 30 567 40 36,456 50 124,728 60 74,059
Estimated Perchlorate Mass (kg) in Each Cell
Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass Cell # Mass
1 3,814 11 8,114 21 3,402 31 0 41 300 51 5,982 61 2,878
2 1,957 12 6,093 22 6,022 32 0 42 166 52 6,331
3 0 13 4,073 23 8,642 33 782 43 32 53 5,296
4 26 14 2,052 24 6,947 34 3,900 44 5,633 54 4,189
5 51 15 32 25 5,251 35 7,017 45 7,366 55 3,082
6 0 16 35 26 3,556 36 10,134 46 7,715 56 8,162
7 782 17 39 27 1,861 37 8,167 47 6,178 57 7,959
8 3,900 18 42 28 166 38 6,200 48 4,641 58 7,755
9 7,017 19 46 29 100 39 4,233 49 13,243 59 4,430
10 10,134 20 782 30 35 40 2,267 50 7,755 60 4,604
Estimated mass summed by column:
27,681 21,308 35,983 42,700 53,028 57,791 2,878
Total estimated mass (all columns) = 241,368 kg
ATK Launch Systems Promontory Groundwater Model Update
Brigham City, Utah July 2018
APPENDIX B
Predicted Perchlorate and TCE Concentrations
EarthFax Engineering Group, LLC
Contaminant Transport Model Projections
I Predicted Perchlorate Concentration (ug/L)
Well/Point
Name
2017
Observed
Predicted
2017 Conc.
After 10 years After 20 years After 30 years
Alt 1 1 Alt 2 Alt 1 I Alt 2 Alt 1 i Alt 2
A-1 23 119 40 120 36 122 32 124
A-10 19 0 0 0 0 0 0 0
A-2 28 8 10 10 9 9 9 10
A-5 4,820 5,000 0 5,000 0 5,000 0 e 5,000
A-8 7,380 5,130 8,459 8,459 12,589 12,589 17,523 17,523
A-9 10,300 10,530 450 10,483 316 10,463 224 10,454
B-1 762 50 157 157 379 379 778 778
B-10 5,480 5,243 4,957 6,709 4,377 8,000 3,852 9,157
B-2 23,700 22,885 4,149 21,547 3,926 21,071 3,678 20,917
B-3 35,500 35,324 32,800 33,400 29,065 31,223 25,172 29,231
B-4 63,900 66,787 36,513 69,667 21,952 71,650 14,469 73,124
B-5 522 1,562 2,498 2,498 3,569 3,569 4,766 4,766
B-6 42,900 42,900 42,900 42,900 42,900 42,900 42,900 42,900
B-9 56 29 36 36 41 41 46 46
C-1 24,500 24,848 18,990 44,270 14,865 59,703 11,945 72,397
C-3 26,700 27,133 17,895 31,659 16,082 34,880 14,282 37,799
C-6 42 0 0 0 0 0 0 0
C-7 84 23 59 59 138 138 311 311
D-1 797 833 339 853 210 868 168 881
D-2 509 397 591 591 825 825 974 1,096
D-4 163,000 163,247 347 163,421 255 163,484 193 163,520
D-5 139,000 138,167 35 138,164 35 138,161 49 138,157
D-6 213,000 215,065 3,429 226,667 2,345 231,303 1,681 234,292
E-1 22,700 22,312 22,198 22,238 22,205 22,223 22,213 22,218
E-10 16,000 16,933 14,881 19,053 9,449 e 20,348 5,867 21,191
E-5 118 0 0 0 1 1 4 4
E-6 69 0 0 0 0 0 0 0
E-7 130 1,791 154 1,786 29 1,784 14 1,783
E-8 146 0 0 0 0 0 0 0
E-9 1,410 1,687 3,251 3,251 5,266 5,266 7,808 7,808
EW-6 122 38 29 31 15 31 2 31
F-4 193 0 0 0 0 0 0 0
F-5 0 1,791 154 1,786 29 1,784 14 1,783
G-3 0 0 0 0 0 0 0 0
G-4 199 0 0 0 0 0 0 0
H-10 0 0 0 0 0 0 0 0
H-5 213 140 93 110 60 86 30 72
H-9 0 85 6 85 4 85 3 85
J-2 110 0 0 0 0 0 0 0
J-4 20 0 0 0 0 0 0 0
J-9 0 0 0 0 0 0 0 0
LF-4 0 0 0 0 0 0 0 0
M-114 15 0 0 0 0 0 0 0
M-39 1,740 15 32 32 53 53 78 78
M-636 85 0 0 0 0 0 0 0
P-10 7 0 0 0 0 0 0 0
P-2 44 0 0 0 0 0 0 0
P-6 0 0 0 0 0 0 0 0
P-7 944 0 0 0 0 0 0 0
Pipe Sp. . 491 473 0 473 0 473 0 473
Shotgun Sp. 222 207 176 224 149 239 128 253
T-2 8 0 0 0 0 0 0 0
Conc. Sum 15,539 15,591 4,147 16,457 3,676 17,091 3,446 17,659
Note: Alternative 1 = Full and instantaneous remediation of all source zones.
Alternative 2 = No remediation of any source zones.
Contaminant Transport Model Projections
Well/Point
Name
Predicted TCE Concentration (ug/L)
2017
Observed
Predicted
2017 Conc.
After 10 years After 20 years After 30 years
Alt 1 II Alt 2 Alt 1 1 Alt 2 Alt 1 I Alt 2
A-10 4 0 0 0 0 0 0 0
A-2 28 33 0 33 0 32 0 32
A-5 1,230 1,230 10 1,230 10 1,230 10 1,230
A-8 4,660 4,660 0 4,660 0 4,660 0 4,660
A-9 172 136 1 136 0 136 0 136
B-1 1,000 728 1,199 1,224 1,502 1,610 1,559 1,886
B-10 5 294 660 660 954 976 1,079 1,223
B-2 3,110 3,250 304 3,192 155 3,188 106 3,192
B-3 1,950 1,809 2,860 2,868 3,232 3,514 3,014 3,926
B-4 919 1,233 1,527 1,530 1,535 1,646 1,282 1,685
B-5 1,060 1,044 888 1,086 631 1,115 421 1,136
B-6 1,920 1,470 212 1,471 8 1,472 6 1,473
B-9 4,540 4,554 0 4,553 0 4,553 0 4,553
BC-3 0 0 0 0 0 0 0 0
C-1 1,010 961 1,239 1,340 1,426 1,725 1,560 2,114
C-3 2,280 2,234 1,806 2,196 1,255 2,161 861 2,141
C-5 654 450 495 554 495 654 492 755
C-6 3 0 0 0 0 0 0 0
C-7 0 13 28 28 51 51 85 85
CP-1 0 13 6 6 3 3 1 1
CP-2 0 80 57 57 32 32 15 15
D-1 7,860 7,860 0 7,860 0 7,860 0 7,860
D-2 1,220 1,230 10 1,230 10 1,230 10 1,230
D-3 22 74 75 79 54 76 32 72
D-4 44 234 209 252 173 265 138 276
D-5 758 783 0 783 0 783 0 783
D-6 750 997 2 996 1 996 1 996
E-10 761 901 41 906 25 910 23 917
E-5 35 5 15 15 26 26 37 37
E-6 27 2 11 11 28 28 47 47
E-7 1,250 1,470 212 1,471 8 1,472 6 1,473
E-8 28 0 0 0 0 0 0 0
E-9 1,440 1,360 253 1,384 127 1,425 150 1,484
EW-6 190 48 23 48 6 49 5 49
F-4 9 0 0 0 0 0 0 0
F-5 65 80 49 81 17 81 6 81
G-3 3 137 143 143 119 147 69 150
G-4 70 35 36 36 27 36 13 37
H-10 0 0 0 0 0 0 0 0
H-4 0 0 0 0 0 0 0 0
H-5 6 7 7 7 5 5 4 4
H-9 0 4 6 6 8 8 9 10
J-2 5 0 0 0 1 1 2 2
J-4 871 788 747 893 709 992 673 1,088
J-9 0 24 32 33 41 44 44 51
LF-4 5 0 0 0 0 0 0 0
M-636B1 0 0 0 0 0 0 0 0
M39-B1 23 17 24 24 33 33 42 42
P-10 315 174 113 179 \ 75 183 49 185
P-2 35 348 380 392 349 430 304 462
P-6 1,650 1,464 499 1,477 232 1,488 133 1,496
P-7 152 20 23 24 23 • 26 21 29
Pipe Sp. 11 17 23 23 30 32 33 38
Shotgun Sp. 18 3 4 4 4 5 5 7 7
T-2 452 489 0 489 i 0 489 0 489
Conc. Sum 775 778 259 830 244 870 224 903
Note: Alternative 1 = Full and instantaneous remediation of all source zones.
Alternative 2 = No remediation of any source zones.