DRC-2021-009441 - 0901a06880ee4193

Dq6-9_02.t-voqtl
Energy Fuels Resources (USA) Inc.
225 Union Blvd, Suite 600
Lakewood, CO, US, 80228
303 974 2140
www.energyfuels.com
1 July 7, 2021
EVIA PDF AND OVERNIGHT DELIVERY
Doug Hansen,
Director of Waste Management and Radiation Control
State of Utah Department of Environmental Quality
1195 North 1950 West
P.O. Box 144880
Salt Lake City, UT 84114-4880
Div of Waste Management
and Radiation Control
JUL 1 2 2021
Re: State of Utah Stipulation and Consent Order ("SCO") Docket Number UGW-20-01
White Mesa Uranium Mill — Energy Fuels Resources (USA) Inc. ("EFRI") Plan and Time
Schedule Pursuant to Part II.H.2 of the Groundwater Corrective Action Plan ("GCAP")
included as Attachment 1 to the SCO
IDear Mr. Hansen:
Part II.H. I) of the GCAP states that "At any time EFR[I] submits a quarterly report that demonstrates an
exceedance (second quarter of chloroform exceedance), EER[I] will provide a written exceedance notice
Ito the Director ("Exceedance Notice") for all wells that have demonstrated such an exceedance." EFRI
I provided notice to the Director that the concentrations of chloroform in TW4-30 exceeded the respective
1GCAL of 70 ug/L for two or more consecutive quarters by letter dated May10, 2021.
Part II.H.2) of the GCAP requires that "Within 60 days after the time of submittal of a quarterly report
'that demonstrates an exceedance as defined in Part II.G, EFR[I] will provide a plan and schedule for
Iremedial actions to address and resolve the excursion, for Director approval."
'This is the plan and schedule required under Part II.H.2) of the GCAP for TW4-30 for the first quarter of
2021. 1
If you should have any questions regarding this submittal please contact me at [phone].
Yours truly,
j(11:1114t
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
cc: David Frydenlund, Terry Slade, Logan Shumway, Scott Bakken, Stewart Smith (HGC)
WHITE MESA MILL
State of Utah
Stipulation and Consent Order Docket No. UGW-20-01
Plan and Time Schedule
Under Part II.H.2
For
Exceedances in TW4-30 in the First Quarter of 2021
Energy Fuels Resources (USA) Inc.
225 Union Boulevard, Suite 600
Lakewood, CO 80228
ENERGY FUELS
July 7, 2021
1. INTRODUCTION
lEnergy Fuels Resources (USA) Inc. ("EFRI") operates the White Mesa Uranium Mill (the
"Mill"), located near Blanding Utah. EFRI performed first quarter 2021 chloroform monitoring
during the period from January 1, to March 31, 2021 under the September 14, 2015 Groundwater
Corrective Action Plan ("GCAP"), included as Attachment 1 to the executed Stipulation and
Consent Order ("SCO").
Part II.H.1) of the GCAP states that "At any time EFR[I] submits a quarterly report that
demonstrates an exceedance (second quarter of chloroform exceedance), EFR[I] will provide a
written exceedance notice to the Director ("Exceedance Notice") for all wells that have
demonstrated such an exceedance." EFRI provided notice to the Director that the concentrations
of chloroform in TW4-30 exceeded the respective GCAL of 70 ug/L for two or more consecutive
quarters by letter dated May10, 2021.
Part II.H.2) of the GCAP requires that "Within 60 days after the time of submittal of a quarterly
report that demonstrates an exceedance as defined in Part II.G, EFR[T] will provide a plan and
schedule for remedial actions to address and resolve the excursion, for Director approval."
1This is the plan and schedule required under Part II.H.2) of the GCAP for TW4-30 for the first
lquarter of 2021.
2. WELLS SUBJECT TO THIS PLAN
TW4-30 is covered by this Plan.
1 3. BACKGROUND
'Figure 1 is a site map showing the locations of perched groundwater wells and other site
features; Figure 2 is a map showing first quarter, 2021 perched groundwater levels and the
I boundaries of the chloroform and nitrate plumes; and Figure 3 is a detail map showing first
quarter, 2021 chloroform concentrations.
lAs shown in Figure 2, perched groundwater flow ranges from generally southwesterly beneath
the Mill site and tailings management system (cells 1 though 4B) to generally southerly along the
eastern and western margins of White Mesa south of the cells. Perched groundwater flow has
been impacted by past (pre-2012) water delivery to the unlined wildlife ponds (Figure 1) which
resulted in groundwater mounds that locally changed groundwater flow directions. Since
delivery of water to these ponds ceased in the first quarter of 2012, the perched groundwater
mounds associated with these ponds have diminished; however the impact of past seepage from
1 the wildlife ponds is still evident in Figure 2. As the groundwater mounds have diminished,
hydraulic gradients have also diminished. In addition to changes related to past delivery of water
to wildlife ponds and the cessation of water delivery to the ponds in 2012, pumping to remediate
both chloroform and nitrate plumes has impacted water levels as cones of depression have
developed.
1
As shown in Figures 2 and 3, the chloroform plume is entirely within the Mill property boundary
and is bounded on all sides by wells having chloroform concentrations that are either non-detect
or less than 70 Ilg/L except at the location of TW4-30. Until the fourth quarter of 2020, TW4-30
' also bounded the plume. Currently, the plume is bounded to the north by TW4-25 (non-detect);
to the west and southwest by MW-28 (non-detect), MW-31 (non-detect), MW-32 (non-detect),
TW4-6 (approximately 3.8 Rg/L) and TW4-23 (non-detect); to the east by TW4-3 (non-detect),
TW4-5 (nearly 13 lig/L), TW4-8 (nearly 27 p.g/L), TW4-9 (approximately 39 [A,g/L), TW4-13
(non-detect), TW4-14 (approximately 1.8 11 g/L), TW4-18 (approximately 52 ttg/L), TW4-27
(nearly 4.7 Rg/L), TW4-36 (non-detect) and TW4-38 (non-detect); to the south by TW4-34 (non-
detect) and TW4-42 (non-detect); and to the southeast by TW4-35 (non-detect).
As discussed above, the chloroform plume is under remediation by pumping. The impacts of
pumping are displayed by the large drawdowns evident in the water level elevation contours
shown in Figure 2. Pumping from wells within and immediately adjacent to the chloroform
plume as of the first quarter of 2021 (5.2 gallons per minute [gpm]) exceeds calculated
'background' flow (HGC, 2020) through the plume (3.4 gpm) and is therefore considered
adequate. In addition, because of continued reductions in saturated thicknesses and hydraulic
gradients resulting from reduced wildlife pond recharge, 'background' flow through the plume is
expected to continue to diminish, thereby reducing the pumping needed to control the plume.
The southernmost portion of the chloroform plume is affected by multiple influences that include
pumping and reduced wildlife pond recharge, in particular, reduced recharge from the southern
wildlife pond. Water levels at most wells within and at the margins of the chloroform plume are
decreasing; however, water levels at wells such as TW4-14, TW4-27 and TW4-30, which are
either located in relatively low permeability materials (TW4-14 and TW4-27), or are relatively
hydraulically isolated (TW4-30), are increasing to stable. Generally decreasing water levels
(since about the fourth quarter of 2013), and generally increasing chloroform concentrations at
TW4-26 and TW4-29 are consistent with reduced wildlife pond seepage, in particular, reduced
seepage from the southern wildlife pond. Plots of water levels and chloroform concentrations at
these wells over time are provided in EFRI (2021).
The groundwater mound associated with the southern wildlife pond created a generally
southeasterly hydraulic gradient within the southern extremity of the chloroform plume that
caused plume migration to the southeast (and toward TW4-30). As the groundwater mound
associated with the southern pond decays, groundwater flow directions in the southern extremity
of the plume are becoming more southerly, and plume migration is turning more to the south. An
increasingly southerly direction of plume migration is consistent with generally increasing
concentrations at TW4-26 since the third quarter of 2016.
A large hydraulic gradient directed from TW4-29 towards TW4-30 existed at the time of
installation of TW4-30 (first quarter of 2013) as shown in Figure 4. At that time TW4-30 was
almost directly downgradient of TW4-29. However, due to decreasing water levels at TW4-29,
and increasing water levels at TW4-30 (Figure 5), the hydraulic gradient from TW4-29 to TW4-
30 has nearly disappeared, as shown in Figure 6. This change in hydraulic gradient removes the
primary driving force for chloroform migration from TW4-29 towards TW4-30, which is now
' cross-gradient of TW4-29.
2
i 4. PLAN AND TIME SCHEDULE
This is a plan and schedule for actions to address and resolve the excursion noted in Table 1
above as required by the GCAP.
1Part II.H.2).i) of the GCAP states that the plan and schedule may include, but is not limited to the
installation of one or more pumping wells in the vicinity of the well found in exceedance and
installation of one or more replacement wells for the compliance well in exceedance. EFRI plans
to address the exceedance through the installation of one additional compliance well (TW4-43).
'Figure 7 shows the location of the proposed new chloroform compliance well TW4-43.
The proposed location of this well is considered appropriate because, as shown in Figure 6, due
to changes in flow directions in the southern extremity of the plume, TW4-30 is now cross-
gradient of TW4-29; and TW4-35, currently non-detect for chloroform, is downgradient of TW4-
30. Therefore, as a downgradient well is already present, only one new cross-gradient bounding
I well to the southeast of TW4-30 is needed.
The GCAP Part II.H.2).i) states that the plan and schedule may include, but is not limited to the
1 installation of one or more pumping wells in the vicinity of the well found in exceedance.
Pursuant to the requirements of the GCAP, EFRI reviewed the existing water level, hydraulic
conductivity and perched groundwater data in the area in and around TW4-30 for the placement
of a new pumping well; or the conversion of an existing well. Based on the results of the
reviews of data for the existing wells, EFRI has determined that an additional pumping well in
the southeast area near TW4-30 is not feasible due to the low permeabilities and small saturated
Ithicknesses in the vicinity of TW4-30.
Table 2 shows the results of hydraulic conductivity measurements, first quarter, 2021 saturated
thicknesses, and calculated transmissivities of wells in the vicinity of TW4-30. Hydraulic
i conductivity data are from HGC (2018) and HGC (2019). Transmissivities of pumping wells
TW4-4, TW4-40 and TW4-41are underestimated due to the small saturated thicknesses resulting
from pumping, However, even with the underestimation of pumping well transmissivities,
calculated transmissivities of pumping wells TW4-4, TW4-40 and TW4-41 are one to three
lorders of magnitude larger than the transmissivities of non-pumping wells. In addition, the
transmissivity at TW4-30 is one to two orders of magnitude smaller than existing pumping wells
TW4-4, TW4-40 and TW4-41.
TW4-40 has the highest calculated transmissivity (399 ft2/day), which is approximately 69 times
larger than the calculated transmissivity of TW4-30 (5.9 ft2/day). Based on reported quarterly
pumping volumes for TW4-40, which sum to approximately 745,580 gallons over the eight
quarters from the second quarter of 2019 through the first quarter of 2021, the average
sustainable pumping rate for TW4-40 is approximately 0.71 gpm. Therefore, because the
transmissivity of TW4-30 is less than 1.5% of the transmissivity of TW4-40, the expected
average sustainable pumping rate for TW4-30 would be less than 0.011 gpm, or about one one-
hundredth of a gallon per minute.
3
Based on this analysis TW4-30, and other nearby non-pumping wells, are not suitable for
pumping, as their productivities would be so low as to make pumping impractical. Furthermore,
there appear to be no nearby productive areas within which a new pumping well could be
installed without interfering with an existing pumping well.
14.1. Experts Reports to be Prepared
lAs required by Part II.H.4, EFRI will submit an as-built report within 60 days of well installation
'for the newly installed well proposed in this plan and time schedule. Boring logs for the well
and test borings will be included in the as-built report.
Assessment of the plume, hydraulic capture and effectiveness of the remediation strategy will be
discussed in the quarterly chloroform reports submitted as required by the GCAP.
4.2. Time Schedule
The installation of the proposed well and the completion of the as-built report will be completed
lin accordance with the required timeframes specified in the approved and executed GCAP. The
proposed wells will be installed and operational within 90 days of director approval of this plan
and time schedule and the as-built report will be completed within 60 days of well completion.
5. CONCLUSION
1 The chloroform plume is currently entirely within the Mill property boundary and (except at
TW4-30) is bounded on all sides by wells having chloroform concentrations that are either non-
detect or less than 70 IA g/L. Data collected to date indicate that, except for the lack of a well
bounding the plume at TW4-30, there are sufficient chloroform monitoring and pumping wells to
effectively define, control, and monitor the plume. Chloroform pumping as of the first quarter of
2021 (5.2 gpm) exceeds calculated 'background' flow through the plume (3.4 gpm) and is
therefore considered adequate. In addition, because of continued reductions in saturated
thicknesses and hydraulic gradients resulting from reduced wildlife pond recharge, 'background'
flow through the plume is expected to continue to diminish, thereby reducing the pumping
needed to control the plume.
As previously stated, within the southernmost portion of the plume, generally decreasing water
levels (since about the fourth quarter of 2013), and generally increasing concentrations at TW4-
26 and TW4-29 are consistent with reduced wildlife pond seepage, in particular, reduced seepage
from the southern wildlife pond. As the groundwater mound associated with the southern pond
decays, groundwater flow directions in the southern extremity of the plume are becoming more
southerly, and plume migration is turning from southeastward to southerly. Proposed new
compliance monitoring well TW4-43 will be located southeast and generally cross-gradient of
1 TW4-30. Existing well TW4-35 will serve as the well downgradient of TW4-30. An additional
pumping well in the vicinity of TW4-30 is not feasible due to transmissivities that are too low to
make pumping practical.
4
6. REFERENCES
' EFRI 2021. White Mesa Uranium Mill Chloroform Monitoring Report. State of Utah Stipulation
and Consent Order Docket No. UGW-20-01, 1st Quarter (January through March) 2021.
HGC 2018. Hydrogeology of the White Mesa Uranium Mill and Recommended Locations of
New Perched Wells to Monitor Proposed Cells 5A and 5B. July 11, 2018.
HGC 2019. Installation and Hydraulic Testing of Perched Well TW4-42, White Mesa Uranium
Mill Near Blanding, Utah (As-Built Report). June 1 1, 2019.
HGC 2020. Corrective Action Comprehensive Monitoring Evaluation (CACME) Report, White
Mesa Uranium Mill Near Blanding, Utah. March 30, 2020.
5
TABLES
Table 1
Chloroform Results in TW4-30
Constituent Monitoring
Event
GCAL
(ul )
Results
(ug/L)
Chloroform Q4 2020
Q1 2021
70.0 82.8
74.8
Table 2
Calculated Transmissivities for Wells Near TW4-30
well
hydraulic
conductivity
(cm/s)
hydraulic
conductivity
(ft/day)
saturated
thickness
(feet)
transmissivity
(T)
(ft2/day) comment
TW4-4* 1.66E-03 4.65 11.68 54.3 T artificially low due to reduction in saturated thickness by pumping
TW4-6 1.15E-05 0.032 17.9 0.58
TW4-26 2.40E-05 0.067 11.41 0.77
TW4-27 1.35E-06 0.0038 14.02 0.053
TW4-29 4.24E-05 0.12 13.57 1.61
TW4-30 1.44E-04 0.40 14.63 5.90
TW4-31 4.18E-05 0.12 28.49 3.33
TW4-33 5.51E-05 0.15 5.84 0.90
TW4-34 9.98E-05 0.28 18.55 5.18
TW4-35 6.27E-05 0.18 6.62 1.16
TW4-40* 9.81E-03 27.47 14.51 399 T artificially low due to reduction in saturated thickness by pumping
TW4-41* 2.69E-03 7.53 4.43 33.4 T artificially low due to reduction in saturated thickness by pumping
TW4-42 2.43E-05 0.068 17.13 1.17
Notes:
* = pumping well
T = product of hydraulic conductivity and saturated thickness
cm/s = centimeters per second
ft/day = feet per day
ft 2 /day = feet squared per day
FIGURES
CORRA1
)
... ,G11
01,01 41'
TWN-12
abandonod • MW-01 1W14-10
TWN-09 • e mom TW N-06 TWN
PIEZ-01
wildlife pond
Wildlife pond
• M4-24 MW-28
CelP 2
TVVN-01 TW4-21 PIEZ.34
ENtRANCL.sp,W
4 2T4WT4W-221-W4-374T:94..2TWO 4TW3:11W84-05
TW4-38
MW-26 4-12
TW4-ii-rwC:::‘_03 TW4?28 8N4-32
• MW-30
TW4-16 TW4-11
° TW44.1214-13
.Th14-°7°.TRN4-08OTW4-3 mw_32 TWO-01 -rw4_04 TW4-41 OTW4-14 • MW-12

MW- .0 Cell 3 4441
DR-06 DR-07 MW-3541 4111.11
• MW-31
MW-360
7VV4-060 _TW4-21-1/44..3-1 T16/4-2 1w4.3ki 0 or
• TW4-260 0TW4-30 MW-25 TW4-29- 0TW4-35 TW4-40' 0
TW4-421, TW4-34
wildlife pond
DR-11 DR-12 DR-13 • PIEZ-05 MW-17
• MW 21
DR-14
MW-39
MW-▪ 38
EXPLANATION
4V1W-24A perched monitoring well installed
December 2019
TW4-42
(:) temporary perched monitoring well
installed April 2019
TW4-40 perched chloroform pumping well
• installed February 2018
TW4-19 • perched chloroform or
nitrate pumping well
MW-38 perched monitoring well installed
February 2018
CORRAL SPRINGS
MW-5
• perched monitoring well
TW4-12
o temporary perched monitoring well
;1-
mile
TWN-7 temporary perched nitrate monitoring
• well
PIEZ-1 perched piezometer
RUIN SPRING
seep or spring
HYDRO WHITE MESA SITE PLAN SHOWING LOCATIONS OF
GEO PERCHED WELLS AND PIEZOMETERS
Int INV CHEM, INC. APPROVED DATE REFERENCE FIGURE
R/718000/TW43/PandTS/Uwelloc1220.srf 1
NV"
CORRAL C
TWN-11 TWN-1
TWN-
5645
TWI4-16
abanril.on,f1
TWN-15
(56o.6
5540
14
".11.1481eci
TA-10 :188481)8d
TWN4/9
TVA -06 /589
/INEZ-01
-°8 I MW -19
1 one
RUIN SPRING EXPLANATION
chloroform plume boundary
nitrate plume boundary
TW4-42
(:) 5526
MW-38
-1:}. 5463
estimated dry area
temporary perched monitoring well
installed April, 2019 showing
elevation in feet amsl
perched monitoring well
installed February, 2018 showing
elevation in feet amsl
îii
TW4-40
+ 5526
MW-5
• 5504
TW4-1 2
0 5569
fNe
temporary perched monitoring well
installed February, 2018 showing
elevation in feet amsl
perched monitoring well showing
elevation in feet amsl
temporary perched monitoring well
showing elevation in feet amsl
1 mile
NOTES: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21, TW4-'37, TW4-39, TW4-40 and TW4-41 are chloroform pumping wells;
TWN-7
*5568
PIEZ-1
temporary perched nitrate monitoring
well showing elevation in feet amsl
perched piezometer showing
5589 elevation in feet amsl
RUIN SPRING
5380 seep or spring showing
elevation in feet amsl
TW4-22, TW4-24, TW4-25 and TWN-2 are nitrate pumping wells; TW4-1, TW4-2 and TW4-11 water levels are below the base of the Burro Canyon Formation
KRIGED 1st QUARTER, 2021 WATER LEVELS HYDRO AND CHLOROFORM AND NITRATE PLUMES GEO WHITE MESA SITE CHEM, INC. APPROVED DATE REFERENCE H/718000/
TW43/PandTS/Uw10321ChIN.srf
FIGURE 2
PIEZ-02 QNS
TW4-24 096
MW-25 OND -
TW4-42
TW4-29 OTW4-30 0 75
OTW4-35 TW4-34 O
t°4 •
MW-27 •
rTWN-02 0. es TWN-04 O
I r
r TW4-25 onto
r— TWN-01 ONS PIEZ-3A -4; .
TW4-g4 0400
TW4-19 TW4-22 C D 05100 TW4-20 93800 0 TW4-37
TW4-09 O OTW4-38
TW4-18 0 •

OTW4-28
ND TW4-32 0 ND

MW-31 OND
. TW4-11
TW4-0g 0919 )21W-64
TA014-070' OTW4-08
"Ls '- 61 TW4-01 MW-3,2 --"114Nelk," OND "1"04t,

OTW4-36

TW4-13 O
44, '
,
TW4-41
01÷W4-04 TW4-14
O
1000 feet
PIEZ-04
iti
j" -23 ND TW4-26
TW4-06 O TW4-33 0 TW4-27 0 OTW4-31
EXPLANATION
NS = not sampled; ND = not detected:
ND 40 = not detected in 4th quarter
kriged chloroform isocon and label
temporary percnea monitoring welt
installed April, 2019 showing
concentration in pg/L
TW4-40 temporary perched monitoring well
+436 installed February, 2018 showing
concentration in pg/L
perched monitoring well showing
concentration (pg/L)
TW4-7 temporary perched monitoring well
0 875 showing concentration (pg/L)
perched piezometer (not sampled)
TW4-42
e? ND
MW-32
•ND
PIEZ-2
NS
111111111111111111111111111111M
NOTES: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21, TW4-37, TW4-39, TW4-40 and TW4-41 are
chloroform pumping wells; TW4-22, TW4-24, TW4-25 and TWN-2 are nitrate pumping wells
-414;1 HYDRO
GEO
W*.r CHEM, INC. APPROVED DATE REFERENCE FIGURE
H:/718000/1W43/PandTS/Uch10321det2 srf 3
KRIGED 1st QUARTER, 2021 CHLOROFORM (pg/L)
WHITE MESA SITE
(detail map)
TWN -1 8 / /
4>i9
cb .<0
/le TW4-1 2 /
0 / ‹,-
WI<N4-011) _
40/' A( 0/ Ae• 4*- \-o 16
I • TW4-1 3 "'t MlAf4r1
, 055.73"
TW4-0 7 07 \ OTW4-0 8 TVV4-0 1 - •••••••••••• •••••••
7 '0
\CCP
556°
5 5 4 055,52
TW4•64 , - — —
7-- 0 , / TW4-4-4- , 7' // ,
/ i TI/Vt06 / i

,rAn r i / ,,..,..,-,.., 1
/. 1 \ TW427 0 \ ATW4-3.1.1 I - 526\ 5520 01 x -.3 TW4-30 , 3.
•
'\
EXPLANATION
hydraulic gradient vector
MW-4 NOTE • 5552
innn fppt •
MW-4, MW-26, TW4-4, TW4-19, and TW4-20 are chloroform pumping wells;
TW4-22, TW4-24, TW4-25, and TWN-2 are nitrate pumping wells
TW4-1 O 5555
based on knged water levels
perched monitoring well showing
elevation in feet amsl
temporary perched monitoring well
showing elevation in feet amsl
PIEZ-2 perched piezometer showing
elevation in feet amsl 5599
TW4-28 temporary perched monitoring well
KE 5581 installed March, 2013 showing
elevation in feet amsl
APPROVED
HYDRO
GEO
CHEM, INC. 101V VA"
KRIGED 1st QUARTER, 2013 WATER LEVELS
AND HYDRAULIC GRADIENT VECTORS
WHITE MESA SITE
(detail map)
DATE REFERENCE H:/718000/
TW43/PandTS/Uw10313czv.srf
FIGURE 4
5550
5545
5540
5535
(7) E 03 "Ir..--411--1111a4116"1111-11111411111---111---114.111-416"11111"111 —1111- ti a) 5530
c o
fa: > IpAlll'''*"4111"'41--ar°11.-111-11..41r4I1
ej .....farar.411-4111 5525
§i
5520
5515
5510
01
13
Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
13 13 13 14 14 14 14 15 15 15 15 16 16 16 16 17 17 17 17 18 18 18 18 19 19 19 19 20 20 20 20 21
Quarter
...48....TW4-29
--iii..i•TW4-30 min HYDRO WATER LEVEL ELEVATIONS AT
TW4-29 AND TW4-30 1.1.1.11 GEO
wolf CHEM, INC. Approved
SJS
Date
X7/6/21
Author
SJS
Date
7/6/21
File Name
Figure 5
Figure
5
H:\718000\TW43\PandTS\figures\Figure5.xlsx: Figure 5
MVt27

TWN,Q4 05580

MW-25 05532-
-
1 TW4-40
/* TW4-34 0 1 I
DA/4-42
-1060 ieet
— Q5525
\N MW-31 \ 05548
•
25 575
r—TINN 01

' 055
TVV2W11
N
TAW...19 N 8 • .7
4-22 Ar, 055Sk \ 05,69 5560 TW4-, ,
y$,t4-19-:TW4cO5 5Av304,3 0/a 20bndr-
\ is TW4- o- .„

/ MW-26\ I n_Tw4-38/ , TW 10 TW4-03
.
/
/
11X4-32 / 055 4
1
5506111/1v74:321, 65 7
,..`'„,3/1/ 23 05532
• "-•--..... ".......N•• --, ...._ -------.
\ ia
— • - ,-,- — - -....

--_,.... . • N ‘ \ c.:-.1C --------. .`<. ‘ / \ \ \ .. .
\NN
,

TW4-06
7- 5529 0 C711/114,-31
0 TW
TW4-26
4.2L____.
TW4-29 - 0- 0 -
b:ab
441,
-
-r I \ 1\
• • • • •••••^.
=1181 4 r t I 8' A' 4 TA/1/4-14 . %Qs-2 r • I,
‘N,
\\\*Ti1/4-1,3
\
. - \ •
*
4\08,
- \ b,)•-•
5540
533
• 0530
<0.25.
5525 .7
EXPLANATION
HYDRO
GEO
CHEM, INC. ":Vre
TW4-42
ed 5526
TW4-40
-4'5526
mw-25
• 5532
TW4-7
5539
PIEZ-2 G, 5583
hydraulic gradient vector based on kriged water levels
temporary perched monitoring well installed April, 2019 showing elevation in feet amsl
temporary perched monitoring well installed February, 2018 showing elevation in feet amsl
perched monitoring well showing
elevation in feet amsl
temporary perched monitoring well showing elevation in feet amsl
perched piezometer showing elevation in feet amsl
_
NOTES: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21, TW4-37, TW4-39, TW4-40 and TW4-41 are chloroform pumping wells; TW4-22, TW4-24, TW4-25 and TWN-2 are nitrate pumping wells; TW4-1, TW4-2 and TW4-11 water levels are below the base of the Burro Canyon Formation
KRIGED 1st QUARTER, 2021 WATER LEVELS
AND HYDRAULIC GRADIENT VECTORS
WHITE MESA SITE
(detail map)
FIGURE 6 APPROVED DATE REFERENCE H:/718000/
TW43/PandTS/Uw10321czy.srf
/

PIEZ-02

PIEZ-3A
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I' ;I 1
/ MyV-26 I. .55TW 10 TW4

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TW4-2 0
..;:fTW4-40
TW4-42
EXPLANATION
TW4- t3
proposed location of TW4-43
hydraulic gradi-nt v-ctor
based on kriged water levels
TW4-42
(,) 5526
TW4-40
+ 5526
MW-25
• 5532
TW4-7
0 5539
PIEZ-2 5583
temporary perched monitoring well installed April, 2019 showing
elevation in feet amsl
temporary perched monitoring well installed February, 2018 showing
elevation in feet amsl
perched monitoring well showing elevation in feet amsl
temporary perched monitoring well
showing elevation in feet amsl
perched piezometer showing elevation in feet amsl
NOTES: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21, TW4-37, TW4-39, TW4-40 and TW4-41 are chloroform pumping wells; TW4-22, TW4-24, TW4-25 and TWN-2 are nitrate pumping wells; TW4-1, TW4-2 and TW4-11 water levels are below the base of the Burro Canyon Formation
PROPOSED LOCATION OF TW4-43
SHOWING KRIGED 1st QUARTER, 2021 WATER LEVELS
AND HYDRAULIC GRADIENT VECTORS
WHITE MESA SITE
APPROVED
HYDRO
GEO
CHEM, INC. DATE REFERENCE H:/718000/ TW43/PandTS/propTW43loc.srf
FIGURE 7