Text

Environmental Sequence Stratigraphy (Ess) and Porosity Analysis, Burial Area 1, Cimarron Former Nuclear Fuel Production Facility
	ML18100A297
Person / Time
Site:	07000925
Issue date:	04/06/2018
From:	Shultz M; Burns & McDonnell
To:	Lux J; Document Control Desk, Office of Nuclear Material Safety and Safeguards
References
	Download: ML18100A297 (34)
	v • d • e

Memorandum Date:

April 6, 2018 To:

Jeff Lux, P.E.

From:

Mike Shultz, PhD

Subject:

Environmental Sequence Stratigraphy (ESS) and Porosity Analysis, Burial Area 1, Cimarron Former Nuclear Fuel Production Facility The ESS analysis described herein includes reviews of existing subsurface data and reformatting of grain size information provided in existing lithologic logs to elucidate trends in grain size.

These trends can be interpreted by a stratigrapher in the context of the depositional environments in which aquifer materials were originally laid down. This process yields an updated conceptual site model (CSM) and provides insight into preferential pathways for groundwater migration and contaminant fate and transport. The work products resulting from the ESS analysis consist of:

1. A network of cross-sections through the Transition Zone (TZ) and out onto the Cimarron River floodplain (Cross-Sections A-A through H-H);

2. An interpretive isopach map of more permeable deposits within the TZ saturated zone;

3. A calculated estimate of the transmissive fraction of the saturated interval within the TZ;

and,

4. This technical memorandum.

Figure 1A shows the geologic cross-section locations and Figure 1B is provided as a legend for the cross-section symbology. Cross-Sections A-A through H-H are included as Figures 2A through 2H. Isopach maps, included as Figures 3A through 3C, show relatively permeable strata thickness with cross-section transects, potentiometric surface, and uranium isopleths, respectively. With the exception of monitor wells 02W29 and 02W46, monitor well water levels presented on the cross-sections were recorded on November 6, 2017. The 02W29 and 02W46 water levels presented on the cross-sections were recorded on July 31, 2017, because water levels recorded at these wells in November 2017 were outside typical historical ranges.

Geologic Setting The BA-1 area consists of a bedrock bench of Permian-age deltaic channel sands and interbedded claystone (Garber Sandstone) upon which the burial trenches were sited (see Figure 1A). An erosional gully partially filled with primarily low-permeability material is present to the north and east of the bedrock ridge, and this gully area has been referred to as the Transition Zone between the bedrock escarpment and the sand-rich deposits of the Cimarron River alluvium present to the north of the burial area.

Environmental Sequence Stratigraphy Analysis The TZ represents a gully eroded into the underlying bedrock which has been partially filled with predominantly fine-grained deposits. The eastern margin of the gully cannot be defined due to the lack of lithologic logs; no borings have been advanced in that area to date. The gully fill

April 5, 2018 Page 2 Memorandum (contd) can be subdivided into a basal clay-rich unit (Lower Gully Fill [LGF]), and an upper silt-rich unit (Upper Gully Fill [UGF]). A relatively sandy deposit marks the base of the UGF unit. An isopach (equal-thickness) map of the sandy zone (relatively permeable strata) at the base of the UGF has been interpreted as part of the ESS analysis (see Figures 3A through 3C). The lateral connectivity of this deposit cannot be fully defined by existing lithologic information. Thus, the isopach map interpreted herein represents a sum of the interpreted permeable thickness and should not necessarily be taken to indicate a channel in the sense of a wholly continuous layer of sandy material. However, the consistent position of the sandy deposit at the contact of the UGF and the LGF suggests that it may in fact be hydraulically connected to a certain degree and that a disproportionate percentage of groundwater flow and contaminant mass flux likely occurs within this thin zone. Figure 3B illustrates the groundwater flow directions and geometry of the potentiometric surface as groundwater flows from the upland deposits through the TZ into the alluvial floodplain deposits.

The LGF likely represents slope failure (slump and debris-flow deposits) derived from soil horizons developed atop the bedrock in the immediate vicinity during initial phases of gully development. Flash flood events periodically removed portions of this material in an iterative process of erosion and deposition. With time, as the gully widened and headward erosion of the gully proceeded, the gully captured a greater area and greater volumes of surface water flowed through the gully during rain events. The area of investigation in the TZ was transformed into an alluvial valley and the setting changed from slope failure-dominated deposition to streamflow-dominated deposition. An erosional surface was carved into the underlying LGF by streams, likely during flash flood events. As described above, residual sands at the base of the UGF mark this transition. From this point on, the gully fill is dominated by thin sand channel deposits and silts of the UGF deposited by waning flow after flood events.

Isoconcentration contours of uranium in groundwater are plotted on the isopach map included as Figure 3C. As shown on this figure, the distribution of uranium in the subsurface seems to correlate well with the interpretive isopach map of the permeable material, with the plume extending northwest from the burial trenches, following the gully sand channel deposits through the TZ and out to the alluvial aquifer in the floodplain. In the upper reaches of the gully, the contaminant distribution appears to be controlled by the location and orientation of the burial trenches, the source of contamination. In this area, the permeable TZ materials appear to split into an eastern and a western zone (e.g., Cross-Section G-G). Contamination appears to be limited to the western permeable unit in this area, likely due to the proximity of the burial trenches. From a CSM perspective, it appears that contaminated groundwater emanating from the BA-1 burial trenches percolates downward through the bedrock and TZ sediments (depending on burial trench location), is discharged into the western arm of the sandy deposits at the UGF/LGF contact, travels northwest within this interval down-gully, and then discharges primarily to the Upper Point Bar (UPB) deposit of the Cimarron River sands.

April 5, 2018 Page 3 Memorandum (contd)

Estimate of Transmissive Porosity within BA1 Transition Zone Boring logs for TZ wells were critically examined as part of the ESS analysis and cross-section creation. Thickness of the sandy unit at the base of the UGF was tabulated for each well and imported into Earth Volumetric Studio (EVS) for calculation of total saturated sand channel volume within the uranium-impacted portion of the TZ (44,458 cubic feet [ft3]). This value was multiplied by an assumed effective porosity for fine silty sand (20%), based on reference values obtained from Applications of Environmental Chemistry - A Practical Guide for Environmental Professionals1, to calculate the transmissive pore volume for saturated sand channel deposits located within the effected BA1 TZ (8,892 ft3).

EVS was also used to calculate the total saturated volume within the uranium-impacted portion of the TZ (511,425 ft3). This volume is comprised of the saturated, uranium-impacted UGF volume (189,137 ft3), the saturated, uranium-impacted LGF volume (277,830 ft3), and the saturated, uranium-impacted sand channel volume (44,458 ft3). The saturated, uranium-impacted UGF and LGF volumes were each multiplied by a conservatively assumed effective porosity for silty-clay (10%), based on reference values1, to calculate the corresponding transmissive pore volume for these fine-grained deposits - 18,914 ft3 for the UGF and 27,783 ft3 for the LGF.

Finally, all three transmissive pore volumes were added together and divided by the bulk volume of impacted, saturated TZ material (511,425 ft3) to calculate the transmissive porosity for the effected BA1 TZ (11%).

The calculation conducted to estimate the transmissive fraction of the saturated interval within the uranium-impacted TZ is presented in Table 1 and two-dimensional (2D) and three-dimensional (3D) renderings of the EVS volume calculations are presented on Figures 4 through

7. This work suggests that approximately 9% of the overall TZ saturated thickness is sandy and therefore constitutes a porous interval with the potential to transmit groundwater and contaminant mass. The estimates presented above and in Table 1 assume that the sand channel deposits are in fact permeable and somewhat connected, and that the clay-and silt-rich LGF and UGF are significantly less transmissive.

As stated above, EVS was used to model 3D volumetric bodies for the saturated, uranium-impacted sand channel, UGF, and LGF TZ deposits. Figure 4 provides a plan view rendering of the volumetric analysis domain. In the horizontal dimension, the northwest domain boundary represents the BA1 TZ/alluvium boundary, the northeast and southeast domain boundaries represent the approximate extent of BA1 uranium groundwater impacts, and the southeast domain boundary (annotated black line) represents the saturated TZ deposit/bedrock interface (at the water table). In the vertical dimension, the water table (depicted as the blue surface on Figure 1 Weiner, Eugene R, Applications of Environmental Chemistry - A Practical Guide for Environmental Professionals, Taylor & Francis Group, LLC, CRC Press, 2000.

April 5, 2018 Page 4 Memorandum (contd)

5) serves as the upper boundary of the volumetric analysis domain, and the basal TZ/bedrock interface (see Figure 5) serves as the lower boundary. Figure 5 provides an orthogonal view of the volumetric analysis domain and the sand channel deposit body, with the UGF and LGF deposits hidden in the model. Figure 6 provides the same orthogonal view shown in Figure 5, with the UGF deposits shown and the LGF and sand channel deposits hidden. Finally, Figure 7 provides the same orthogonal view with the LGF deposits shown and the UGF and sand channel deposits hidden.

Cimarron River Deposits Sand-rich point bar and overlying floodplain deposits of the Cimarron River to the north interfinger with the gully fill deposits (e.g., Cross-Section A-A). Individual point-bar deposits of the Cimarron River are approximately 5 thick, and in the BA1 investigation area there are two stacked point bar deposits (UPB and Lower Point Bar [LPB]). A sharp grain size increase marks the base of the UPB, and this contact surface is well-displayed in Cross-Sections A-A, B-B, and C-C. This contact is indicated by a thin zone of increased conductivity in the electrical conductivity (EC) log for 02W32 (Cross-Section D-D), probably related to a slight increase in clay content in the upper foot of the lower point bar. This contact is also indicated by a color change described in the boring log for 02W32. Depth-discrete sampling at 02W32 (see Cross-Section D-D) suggests that the majority of contaminant mass flux is occurring within the UPB deposit within the Cimarron River sands. Cross-section A-A shows a connection to the UPB deposits with the sandy unit present at the base of the UGF, suggesting that this is the pathway from the gully fill to the UPB Deposits. The relatively higher concentration within the UPB may be explained by this connection.

Data Gaps and Recommendations While it is likely that channel sand deposits at the UGF/LGF interface represents the primary pathway for contaminants in the TZ, there are no data related to the vertical distribution of uranium within the TZ gully fill deposits. Attempts at depth-discrete groundwater sampling in TZ material have been unsuccessful due to the low-permeability nature of the gully fill sequence.

Vertical profiling of groundwater flow and chemistry within existing wells via dye tracer systems offered by the United States Geological Survey (USGS) and/or BESST, Inc. may provide data to support the CSM presented herein, and the results may be useful in refining the BA1 remedial action implementation plans. In addition, other means of obtaining depth-discrete high-resolution vertical profiling of uranium should be investigated.

Attachments:

Figure 1A:

Cross-Section Location Map Figure 1B:

Cross-Section Legend Figures 2A-2H:

Cross-Sections A-A through H-H Figure 3A:

Isopach Map of Relatively Permeable Deposits of the

April 5, 2018 Page 5 Memorandum (contd)

Transition Zone Figure 3B:

Isopach Map of Relatively Permeable Deposits of the Transition Zone with Potentiometric Surface Contours Figure 3C:

Isopach Map of Relatively Permeable Deposits of the Transition Zone with Uranium Isopleth Contours Table 1:

Transmissive Porosity Calculation for Saturated and Contaminated BA1 Transition Zone Figure 4:

Plan View of Transition Zone Saturated Bedrock and Intra-Gully Stream Deposits - Burial Area 1 Figure 5:

Orthogonal View of Saturated Intra-Gully Stream Deposits and Bedrock - Burial Area 1 Figure 6:

Orthogonal View of Saturated Upper Gully Fill Deposits and Bedrock - Burial Area 1 Figure 7:

Orthogonal View of Saturated Lower Gully Fill Deposits and Bedrock - Burial Area 1 cc:

John Hesemann Jeff Binder Bill Halliburton

Figure 1A - Cross-Section Location Map

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Service Layer Credits: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community Legend M

MONITORING WELL IN TRANSITION ZONE M

MONITORING WELL IN ALLUVIUM M

MONITORING WELL IN SANDSTONE A M

MONITORING WELL IN SANDSTONE B M

MONITORING WELL IN SANDSTONE C WASTE DISPOSAL TRENCH AERIAL PHOTO - 2010 / MAP PRODUCED - 4/6/2018 COORDINATES : (NAD 83) STATE PLANE OKLAHOMA NORTH FEET Source: ESRI and Burns & McDonnell Engineering.

DATE :

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0 100 200 50 Feet FIGURE 1A CROSS-SECTION LOCATION MAP BURIAL AREA 1 CIMARRON SITE, OKLAHOMA A

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Figure 1B - Cross-Section Legend

Cimarron River Floodplain Deposits: Clay, silt, and interbedded fine-grained sand corresponding to floodplain deposits of the Cimarron River. Sands as overbank splays deposited during flood-stages.

Cimarron River Channel Deposits: Fine to coarse-grained, trough cross-bedded sand deposited as point-bars by the Cimarron River. Minor intraclast or extrabasinal conglomerate lags define bases of individual point-bar sequences Upper Gully Fill: Silt and silty sand with interbedded clayey sand and silty sand deposited as gully-wash by stream-flow during flash flood events. Contains minor sand-rich streamflow deposits.

Lower Gully Fill: Clay-rich deposits including gully-wall failure (slump, slide, and debris-flow). Chaotic, may include minor re-worked streamflow deposits.

Intra-gully Stream Deposits: Sand and silty sand deposited by streamflow within gully system.

Estimated Intra-gully Stream Deposits: Sand and silty sand deposited by streamflow within gully system.

Cimarron River Clay Plug Deposits: Clay and silt, some thin sands, deposited in abandoned stretches of Cimarron River channels (oxbow lakes).

LOG LEGEND 0.0 5.0 10.0 WELL ID WELL SCREEN DEPTH IN FEET BELOW GROUND SURFACE EC/HPT LOG 50 0

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CLAY SANDY CLAY GRAVELLY CLAY SILT SANDY SILT CLAYEY SILT FINE GRAVELY SILT COARSE GRAVELY SILT CLEAN FINE SAND SILTY FINE SAND CLEAN MEDIUM SAND CLAYEY MEDIUM SAND MEDIUM SAND WITH FINE GRAVEL GRAVELY SAND WITH COARSE GRAVEL CLEAN COARSE SAND COARSE SAND WITH FINE GRAVEL COARSE SAND WITH COARSE GRAVEL FINE GRAVEL WITH SAND MEDIUM GRAVEL WITH SAND COARSE GRAVEL WITH SAND mS/m - MILLISIEMENS PER METER psi - POUNDS PER SQUARE INCH EC - ELECTRICAL CONDUCTIVITY HPT - HYDRAULIC PROFILING TOOL

- OBSERVED WATER LEVEL Figure 1B CROSS-SECTION LEGEND BURIAL AREA 1 CIMMARON SITE, OKLAHOMA 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

Garber Sandstone Bedrock (undifferentiated).

Schematic point bar lateral accretion surface.

Waste Disposal Trench (approximate)

Figures 2A-2H - Cross-Sections A-A through H-H

COPYRIGHT © Figure 2A CROSS-SECTION A-A BURIAL AREA 1 CIMMARON SITE, OKLAHOMA 0.0 5.0 10.0 15.0 20.0 25.0 1363 0.0 5.0 10.0 15.0 20.0 25.0 02W43 0.0 5.0 10.0 15.0 20.0 25.0 02W37 0.0 5.0 10.0 15.0 20.0 25.0 02W18 0.0 5.0 10.0 15.0 20.0 02W19 0.0 5.0 10.0 15.0 20.0 02W07 0.0 5.0 10.0 15.0 TMW-13 0.0 5.0 10.0 15.0 02W02 0.0 5.0 10.0 15.0 20.0 TMW-09 0.0 5.0 10.0 15.0 20.0 4.0 02W29 0

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15.0 20.0 02W39 0.0 5.0 10.0 15.0 20.0 02W20 A

A' 905 910 915 920 925 930 935 940 945 950 955 905 910 915 920 925 930 935 940 945 950 955 0.0 100.0 200.0 300.0 400.0 500.0 600.0 700.0 800.0 Cross-Section A-A' SOUTH NOTES

1) Y-AXIS MEASURED IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1983)

2) X-AXIS MEASURED IN FEET

3) ALL CROSS-SECTION SYMBOLS ARE DEFINED ON FIGURE 1B

4) HORIZONTAL AND VERTICAL SCALES ARE APPROXIMATE

5) SURFACE TOPOGRAPHY IS APPROXIMATE

6) GROUNDWATER ELEVATIONS MEASURED NOVEMBER 6, 2017, EXCEPT 02W29 (MEASURED JULY, 31 2017)

7) CORRELATION OF UNITS IS AN INTERPRETATION AND NOT NECESSARILY A DELINEATION OF ACTUAL EXTENT AND THICKNESS OF EACH INDIVIDUAL UNIT LOWER POINT BAR DEPOSIT UPPER POINT BAR DEPOSIT B-B C-C D-D H-H G-G F-F E-E NORTH 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

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LOWER POINT BAR DEPOSIT UPPER POINT BAR DEPOSIT LOWER POINT BAR DEPOSIT 0.0 5.0 10.0 15.0 20.0 25.0 02W34 0.0 5.0 10.0 15.0 20.0 25.0 02W62 0.0 5.0 10.0 15.0 20.0 25.0 02W35 0.0 5.0 10.0 15.0 20.0 25.0 02W37 0.0 5.0 10.0 15.0 20.0 25.0 02W44 0.0 5.0 10.0 15.0 20.0 25.0 1362 0.0 5.0 10.0 15.0 20.0 25.0 1364 0.0 5.0 10.0 15.0 20.0 25.0 1366 0.0 5.0 10.0 15.0 20.0 25.0 1370 B

B' 905 910 915 920 925 930 935 940 945 905 910 915 920 925 930 935 940 945 0.0 100.0 200.0 300.0 400.0 500.0 600.0 Cross-Section B-B' NOTES

1) Y-AXIS MEASURED IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1983)

2) X-AXIS MEASURED IN FEET

3) ALL CROSS-SECTION SYMBOLS ARE DEFINED ON FIGURE 4-1

4) HORIZONTAL AND VERTICAL SCALES ARE APPROXIMATE

5) SURFACE TOPOGRAPHY IS APPROXIMATE

6) GROUNDWATER ELEVATIONS MEASURED NOVEMBER 6, 2017

7) CORRELATION OF UNITS IS AN INTERPRETATION AND NOT NECESSARILY A DELINEATION OF ACTUAL EXTENT AND THICKNESS OF EACH INDIVIDUAL UNIT WEST EAST A-A COPYRIGHT © Figure 2B CROSS-SECTION B-B BURIAL AREA 1 CIMMARON SITE, OKLAHOMA 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

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Figure 2C CROSS-SECTION C-C BURIAL AREA 1 CIMMARON SITE, OKLAHOMA A-A 0.0 5.0 10.0 15.0 20.0 02W23 0.0 5.0 10.0 15.0 20.0 02W17 0.0 5.0 10.0 15.0 20.0 02W06 0.0 5.0 10.0 15.0 20.0 02W07 0.0 5.0 10.0 15.0 20.0 02W08 0.0 5.0 10.0 15.0 20.0 25.0 02W12 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 TMW-23 C

C' 895 900 905 910 915 920 925 930 935 940 895 900 905 910 915 920 925 930 935 940 0.0 100.0 200.0 300.0 WEST EAST Cross-Section C-C' LOWER POINT BAR DEPOSIT UPPER POINT BAR DEPOSIT NOTES

1) Y-AXIS MEASURED IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1983)

2) X-AXIS MEASURED IN FEET

3) ALL CROSS-SECTION SYMBOLS ARE DEFINED ON FIGURE 4-1

4) HORIZONTAL AND VERTICAL SCALES ARE APPROXIMATE

5) SURFACE TOPOGRAPHY IS APPROXIMATE

6) GROUNDWATER ELEVATIONS MEASURED NOVEMBER 6, 2017

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100 0

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HPT Press. Max (psi) 50 120 0

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4 60 bedrock type not specified mudstone and red sandstone mudstone mudstone and red sandstone mudstone mudstone and red sandstone silty color change from yellow gray above to pale orange below @13 noted in boring log, subtle conductivity kick BEDROCK LOWER POINT BAR DEPOSIT UPPER POINT BAR DEPOSIT FLOOD PLAIN DEPOSITS ABANDONED CHANNEL CLAY PLUG DEPOSIT 0.0 5.0 10.0 15.0 02W22 0.0 5.0 10.0 15.0 02W16 0.0 5.0 10.0 15.0 02W05 0.0 5.0 10.0 15.0 TMW-13 0.0 5.0 10.0 15.0 20.0 02W32 0.0 5.0 10.0 15.0 20.0 02W13 D

D' 915 920 925 930 935 940 915 920 925 930 935 940 0.0 100.0 200.0 WEST EAST NOTES

1) Y-AXIS MEASURED IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1983)

2) X-AXIS MEASURED IN FEET

3) ALL CROSS-SECTION SYMBOLS ARE DEFINED ON FIGURE 4-1

4) HORIZONTAL AND VERTICAL SCALES ARE APPROXIMATE

5) SURFACE TOPOGRAPHY IS APPROXIMATE

6) GROUNDWATER ELEVATIONS MEASURED NOVEMBER 6, 2017

7) CORRELATION OF UNITS IS AN INTERPRETATION AND NOT NECESSARILY A DELINEATION OF ACTUAL EXTENT AND THICKNESS OF EACH INDIVIDUAL UNIT Cross-Section D-D' A-A COPYRIGHT © Figure 2D CROSS-SECTION D-D BURIAL AREA 1 CIMMARON SITE, OKLAHOMA 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

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Cross-Section E-E' 50 0

20 0

1 HPT Press. Max (psi) 100 0 2

1 0

8 40 60 02W02 EC (mS/m)

A-A 0.0 5.0 10.0 15.0 TMW-18/TMW-19 0.0 5.0 10.0 15.0 02W03 0.0 5.0 10.0 15.0 02W02 0.0 5.0 10.0 15.0 02W46 0.0 5.0 10.0 15.0 TMW-07 0.0 5.0 10.0 15.0 20.0 TMW-05 E

E' 915 920 925 930 935 940 945 915 920 925 930 935 940 945 0.0 100.0 200.0 WEST EAST potential younger channel deposit?

1) Y-AXIS MEASURED IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1983)

2) X-AXIS MEASURED IN FEET

3) ALL CROSS-SECTION SYMBOLS ARE DEFINED ON FIGURE 4-1

4) HORIZONTAL AND VERTICAL SCALES ARE APPROXIMATE

5) SURFACE TOPOGRAPHY IS APPROXIMATE

6) GROUNDWATER ELEVATIONS MEASURED NOVEMBER 6, 2017, EXCEPT 02W46 (MEASURED JULY 31, 2017)

7) CORRELATION OF UNITS IS AN INTERPRETATION AND NOT NECESSARILY A DELINEATION OF ACTUAL EXTENT AND THICKNESS OF EACH INDIVIDUAL UNIT Figure 2E CROSS-SECTION E-E BURIAL AREA 1 CIMMARON SITE, OKLAHOMA 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

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M MM M

M M

M 1315R 02W46 02W39 02W31 02W29 02W28 02W26 02W20 02W13 02W10 02W09 02W03 02W02 02W01 TMW-09 TMW-07 TMW-06 TMW-05 GE-BA1-01 1367 1370 1366 1365 1364 1363 1362 1361 02W62 02W45 02W44 02W43 02W38 02W37 02W36 02W35 02W34 02W33 02W32 02W24 02W23 02W22 02W21 02W19 02W18 02W17 02W16 02W15 02W14 02W12 02W11 02W08 02W07 02W06 02W05 02W04 TMW-24 TMW-13 1316R 02W53 02W47 02W42 02W41 02W40 02W30 02W27 02W25 TMW-25 TMW-21 TMW-20 TMW-19 TMW-18 TMW-08 TMW-02 TMW-01 02W48 TMW-23 TMW-17 A

A' B

B' C

C' D

D' E

E' G

G' H

H' F

F'

50 100 041 0

TMW-09 EC (mS/m) 011 01 HPT Press. Max (psi) 40 60 80 100 20 WEST EAST A-A 0.0 5.0 10.0 15.0 20.0 25.0 1316R 0.0 5.0 10.0 15.0 20.0 TMW-09 0.0 5.0 10.0 15.0 20.0 02W28 0.0 5.0 10.0 15.0 20.0 02W10 F

F' 920 925 930 935 940 945 950 920 925 930 935 940 945 950 0.0 100.0 Cross-Section F-F' Figure 2F CROSS-SECTION F-F BURIAL AREA 1 CIMMARON SITE, OKLAHOMA NOTES

1) Y-AXIS MEASURED IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1983)

2) X-AXIS MEASURED IN FEET

3) ALL CROSS-SECTION SYMBOLS ARE DEFINED ON FIGURE 4-1

4) HORIZONTAL AND VERTICAL SCALES ARE APPROXIMATE

5) SURFACE TOPOGRAPHY IS APPROXIMATE

6) GROUNDWATER ELEVATIONS MEASURED NOVEMBER 6, 2017

M M

M MM M

M M

M 1315R 02W46 02W39 02W31 02W29 02W28 02W26 02W20 02W13 02W10 02W09 02W03 02W02 02W01 TMW-09 TMW-07 TMW-06 TMW-05 GE-BA1-01 1367 1370 1366 1365 1364 1363 1362 1361 02W62 02W45 02W44 02W43 02W38 02W37 02W36 02W35 02W34 02W33 02W32 02W24 02W23 02W22 02W21 02W19 02W18 02W17 02W16 02W15 02W14 02W12 02W11 02W08 02W07 02W06 02W05 02W04 TMW-24 TMW-13 1316R 02W53 02W47 02W42 02W41 02W40 02W30 02W27 02W25 TMW-25 TMW-21 TMW-20 TMW-19 TMW-18 TMW-08 TMW-02 TMW-01 02W48 TMW-23 TMW-17 A

A' B

B' C

C' D

D' E

E' G

G' H

H' F

F'

A-A 0.0 5.0 10.0 15.0 20.0 TMW-21 0.0 5.0 10.0 15.0 20.0 25.0 02W42 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 1315R/TMW-17 0.0 5.0 10.0 15.0 20.0 02W29 0.0 5.0 10.0 15.0 20.0 02W09 0.0 5.0 10.0 15.0 TMW-06 G

G' 900 905 910 915 920 925 930 935 940 945 950 955 960 900 905 910 915 920 925 930 935 940 945 950 955 960 0.0 100.0 200.0 Cross-Section G-G' TMW-17 1315R COPYRIGHT © Figure 2G CROSS-SECTION G-G BURIAL AREA 1 CIMMARON SITE, OKLAHOMA 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

NOTES

1) Y-AXIS MEASURED IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1983)

2) X-AXIS MEASURED IN FEET

3) ALL CROSS-SECTION SYMBOLS ARE DEFINED ON FIGURE 4-1

4) HORIZONTAL AND VERTICAL SCALES ARE APPROXIMATE

5) SURFACE TOPOGRAPHY IS APPROXIMATE

6) GROUNDWATER ELEVATIONS MEASURED NOVEMBER 6, 2017, EXCEPT 02W29 (MEASURED JULY, 31 2017)

7) CORRELATION OF UNITS IS AN INTERPRETATION AND NOT NECESSARILY A DELINEATION OF ACTUAL EXTENT AND THICKNESS OF EACH INDIVIDUAL UNIT WEST EAST M

M M

MM M

M M

M 1315R 02W46 02W39 02W31 02W29 02W28 02W26 02W20 02W13 02W10 02W09 02W03 02W02 02W01 TMW-09 TMW-07 TMW-06 TMW-05 GE-BA1-01 1367 1370 1366 1365 1364 1363 1362 1361 02W62 02W45 02W44 02W43 02W38 02W37 02W36 02W35 02W34 02W33 02W32 02W24 02W23 02W22 02W21 02W19 02W18 02W17 02W16 02W15 02W14 02W12 02W11 02W08 02W07 02W06 02W05 02W04 TMW-24 TMW-13 1316R 02W53 02W47 02W42 02W41 02W40 02W30 02W27 02W25 TMW-25 TMW-21 TMW-20 TMW-19 TMW-18 TMW-08 TMW-02 TMW-01 02W48 TMW-23 TMW-17 A

A' B

B' C

C' D

D' E

E' G

G' H

H' F

F'

0.0 5.0 10.0 15.0 20.0 25.0 30.0 5.

10.0 15.0 20.0 25.0 TMW-08 1

15.0 20.0 02W39 0.0 5.0 10.0 15.0 20.0 02W26 H

H' 920 925 930 935 940 945 950 955 960 965 920 925 930 935 940 945 950 955 960 965 0.0 100.0 WEST EAST Cross-Section H-H' A-A NOTES

1) Y-AXIS MEASURED IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1983)

2) X-AXIS MEASURED IN FEET

3) ALL CROSS-SECTION SYMBOLS ARE DEFINED ON FIGURE 4-1

4) HORIZONTAL AND VERTICAL SCALES ARE APPROXIMATE

5) SURFACE TOPOGRAPHY IS APPROXIMATE

6) GROUNDWATER ELEVATIONS MEASURED NOVEMBER 6, 2017

7) CORRELATION OF UNITS IS AN INTERPRETATION AND NOT NECESSARILY A DELINEATION OF ACTUAL EXTENT AND THICKNESS OF EACH INDIVIDUAL UNIT COPYRIGHT © Figure 2H CROSS-SECTION H-H BURIAL AREA 1 CIMMARON SITE, OKLAHOMA 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

M M

M MM M

M M

M 1315R 02W46 02W39 02W31 02W29 02W28 02W26 02W20 02W13 02W10 02W09 02W03 02W02 02W01 TMW-09 TMW-07 TMW-06 TMW-05 GE-BA1-01 1367 1370 1366 1365 1364 1363 1362 1361 02W62 02W45 02W44 02W43 02W38 02W37 02W36 02W35 02W34 02W33 02W32 02W24 02W23 02W22 02W21 02W19 02W18 02W17 02W16 02W15 02W14 02W12 02W11 02W08 02W07 02W06 02W05 02W04 TMW-24 TMW-13 1316R 02W53 02W47 02W42 02W41 02W40 02W30 02W27 02W25 TMW-25 TMW-21 TMW-20 TMW-19 TMW-18 TMW-08 TMW-02 TMW-01 02W48 TMW-23 TMW-17 A

A' B

B' C

C' D

D' E

E' G

G' H

H' F

F'

Figure 3A - Isopach Map of Relatively Permeable Deposits of the Transition Zone

M M

M MM M

M M

M 1315R 02W46 02W39 02W31 02W29 02W28 02W26 02W20 02W13 02W10 02W09 02W03 02W02 02W01 TMW-09 TMW-07 TMW-06 TMW-05 GE-BA1-01 1368 1367 1370 1366 1365 1364 1363 1362 1361 1344 02W62 02W45 02W44 02W43 02W38 02W37 02W36 02W35 02W34 02W33 02W32 02W24 02W23 02W22 02W21 02W19 02W18 02W17 02W16 02W15 02W14 02W12 02W11 02W08 02W07 02W06 02W05 02W04 TMW-24 TMW-13 1316R 02W53 02W52 02W51 02W50 02W47 02W42 02W41 02W40 02W30 02W27 02W25 TMW-25 TMW-21 TMW-20 TMW-19 TMW-18 TMW-08 TMW-02 TMW-01 02W48 TMW-23 TMW-17 2095000 2095000 2095200 2095200 2095400 2095400 2095600 2095600 2095800 2095800 2096000 2096000 2096200 2096200 322600 322600 322800 322800 323000 323000 323200 323200 323400 323400 Path: Z:\\Clients\\ENS\\CERT\\_ClientInfo\\Sites\\Database\\Geospatial\\Maps & Dwgs\\ArcGIS\\BMCD_Files\\Arcdocs\\2018\\ESS Tech Memo\\Isopach Map.mxd COPYRIGHT © 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

Service Layer Credits: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community Legend M

MONITORING WELL IN TRANSITION ZONE M

MONITORING WELL IN ALLUVIUM M

MONITORING WELL IN SANDSTONE A M

MONITORING WELL IN SANDSTONE B M

MONITORING WELL IN SANDSTONE C WASTE DISPOSAL TRENCH AERIAL PHOTO - 2010 / MAP PRODUCED - 4/6/2018 COORDINATES : (NAD 83) STATE PLANE OKLAHOMA NORTH FEET Source: ESRI and Burns & McDonnell Engineering.

DATE :

+/-

0 100 200 50 Feet FIGURE 3A ISOPACH CONTOURS BURIAL AREA 1 CIMARRON SITE, OKLAHOMA NOTES:

ISOPACH THICKNESS CONTOUR LINES APPROXIMATED. LINES BASED ON BASAL, SATURATED, INTRA-GULLY STREAM DEPOSITS.

ZERO EDGE ONE FOOT TWO FEET THREE FEET ESTIMATED THICKNESS OF RELATIVELY PERMEABLE STRATA A

A' B

B' C

C' D

D' E

E' G

G' H

H' F

F' CROSS-SECTION LINE

Figure 3B - Isopach Map of Relatively Permeable Deposits of the Transition Zone with Potentiometric Surface Contours

M M

M MM M

M M

M 2095000 2095000 2095200 2095200 2095400 2095400 2095600 2095600 2095800 2095800 2096000 2096000 2096200 2096200 322600 322600 322800 322800 323000 323000 323200 323200 323400 323400 Path: Z:\\Clients\\ENS\\CERT\\_ClientInfo\\Sites\\Database\\Geospatial\\Maps & Dwgs\\ArcGIS\\BMCD_Files\\Arcdocs\\2018\\ESS Tech Memo\\Isopach Poten Conc Map.mxd COPYRIGHT © 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

Service Layer Credits: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community AERIAL PHOTO - 2010 / MAP PRODUCED - 4/6/2018 COORDINATES : (NAD 83) STATE PLANE OKLAHOMA NORTH FEET Source: ESRI and Burns & McDonnell Engineering.

DATE :

+/-

0 100 200 50 Feet FIGURE 3B ISOPACH CONTOURS WITH POTENTIOMETRIC SURFACE BURIAL AREA 1 CIMARRON SITE, OKLAHOMA NOTES:

GROUNDWATER ELEVATION DATA COLLECTED MARCH 18, 2015 ELEVATIONS ARE IN FEET ABOVE MEAN SEA LEVEL (NORTH AMERICAN VERTICAL DATUM 1988)

DATA FROM GE-BA1-01 NOT USED IN CONTOURING ISOPACH CONTOUR LINES APPROXIMATED. LINES BASED ON BASAL, SATURATED, INTRA-GULLY STREAM DEPOSITS.

GW - GROUNDWATER 1316R 932.85 TMW-17 932.07 02W26 936.50 02W20 937.75 TMW-20 938.59 02W50 940.38 TMW-02 940.03 02W51 950.63 02W47 939.91 02W40 939.13 02W25 945.43 TMW-01 940.61 TMW-21 936.33 02W41 937.85 02W39 935.79 TMW-06 935.44 02W52 939.75 TMW-19 929.02 TMW-18 928.19 TMW-24 927.17 1344 926.85 02W45 927.34 02W37 927.35 02W62 927.37 02W34 927.43 02W36 927.42 02W18 927.37 02W38 927.37 TMW-23 928.26 02W11 927.45 02W14 927.47 02W19 927.46 02W24 927.43 02W21 927.45 02W23 927.46 02W07 927.49 02W12 927.42 02W05 927.53 02W22 927.51 02W33 927.55 02W15 927.56 02W04 927.56 02W02 931.09 02W46 929.61 02W30 934.83 02W29 935.43 02W48 927.09 TMW-13 927.52 02W03 928.53 TMW-07 932.57 TMW-05 933.51 02W10 934.80 02W31 934.09 02W01 933.44 02W53 932.266 1361 927.23 GE-BA1-01 929.21*

TMW-25 937.66 1315R 934.95 937 932 931 927.25 927.00 1367 927.31 1364 927.24 1366 927.19 1365 927.22 1363 927.27 1362 927.30 02W08 927.42 02W06 927.48 02W32 927.54 02W17 927.46 934 933 TMW-09 934.16 02W28 934.57 02W42 937.70 TMW-08 935.61 02W13 927.67 02W27 932.21 02W43 927.34 02W44 927.32 02W35 927.38 930 929 928 927.50 936 935 938 939 940 941 942 943 944 945 Legend M

MONITORING WELL IN TRANSITION ZONE M

MONITORING WELL IN ALLUVIUM M

MONITORING WELL IN SANDSTONE A M

MONITORING WELL IN SANDSTONE B M

MONITORING WELL IN SANDSTONE C GROUNDWATER FLOW DIRECTION ALLUVIUM DEPOSITS GW CONTOURS SANDSTONE B GW CONTOURS WASTE DISPOSAL TRENCH ZERO EDGE ONE FOOT TWO FEET THREE FEET ESTIMATED THICKNESS OF RELATIVELY PERMEABLE STRATA A

A' B

B' C

C' D

D' E

E' G

G' H

H' F

F' CROSS-SECTION LINE

Figure 3C - Isopach Map of Relatively Permeable Deposits of the Transition Zone with Uranium Isopleth Contours

M M

M MM M

M M

M 1315R 02W46 02W39 02W31 02W29 02W28 02W26 02W20 02W13 02W10 02W09 02W03 02W02 02W01 TMW-09 TMW-07 TMW-06 TMW-05 GE-BA1-01 1368 1367 1370 1366 1365 1364 1363 1362 1361 1344 02W62 02W45 02W44 02W43 02W38 02W37 02W36 02W35 02W34 02W33 02W32 02W24 02W23 02W22 02W21 02W19 02W18 02W17 02W16 02W15 02W14 02W12 02W11 02W08 02W07 02W06 02W05 02W04 TMW-24 TMW-13 1316R 02W53 02W52 02W51 02W50 02W47 02W42 02W41 02W40 02W30 02W27 02W25 TMW-25 TMW-21 TMW-20 TMW-19 TMW-18 TMW-08 TMW-02 TMW-01 02W48 TMW-23 TMW-17 2095000 2095000 2095200 2095200 2095400 2095400 2095600 2095600 2095800 2095800 2096000 2096000 2096200 2096200 322600 322600 322800 322800 323000 323000 323200 323200 323400 323400 Path: Z:\\Clients\\ENS\\CERT\\_ClientInfo\\Sites\\Database\\Geospatial\\Maps & Dwgs\\ArcGIS\\BMCD_Files\\Arcdocs\\2018\\ESS Tech Memo\\Isopach U Conc Map.mxd COPYRIGHT © 2018 BURNS & McDONNELL ENGINEERING COMPANY, INC.

Service Layer Credits: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community AERIAL PHOTO - 2010 / MAP PRODUCED - 4/6/2018 COORDINATES : (NAD 83) STATE PLANE OKLAHOMA NORTH FEET Source: ESRI and Burns & McDonnell Engineering.

DATE :

+/-

0 100 200 50 Feet FIGURE 3C ISOPACH CONTOURS WITH URANIUM ISOPLETHS BURIAL AREA 1 CIMARRON SITE, OKLAHOMA NOTES:

UG/L - MICROGRAMS PER LITER ISOPACH CONTOUR LINES APPROXIMATED. LINES BASED ON BASAL, SATURATED, INTRA-GULLY STREAM DEPOSITS.

URANIUM COTOURS ARE BASED ON 95% UCL FROM DATA COLLECTED 2011 THROUGH 2ND QUARTER 2017.

ZERO EDGE ONE FOOT TWO FEET THREE FEET ESTIMATED THICKNESS OF RELATIVELY PERMEABLE STRATA 0

0 0

Legend M

MONITORING WELL IN TRANSITION ZONE M

MONITORING WELL IN ALLUVIUM M

MONITORING WELL IN SANDSTONE A M

MONITORING WELL IN SANDSTONE B M

MONITORING WELL IN SANDSTONE C URANIUM CONTOURS IN UG/L WASTE DISPOSAL TRENCH 0

A A'

B B'

C C'

D D'

E E'

G G'

H H'

F F'

CROSS-SECTION LINE 1000 2000 1000 0

Table 1 - Transmissive Porosity Calculation for Saturated and Contaminated BA1 Transition Zone

Table 1 Transmissive Porosity Calculation for Saturated and Contaminated Burial Area #1 Transition Zone Cimarron Environmental Response Trust AquiferZone AquiferMaterial Bulk Aquifer Volume (ft3)1 Assumed Effective Porosity2 Transmissive PoreVolume (ft3)

Total Bulk Aquifer Volume(ft3)1 Total Transmissive PoreVolume (ft3)

Calculated Effective Porosity ImpactedTZUGFDeposits siltandsiltysandwith interbeddedclayeysandand siltysand 189,137 10%

18,914 ImpactedTZSandChannelDeposits sandandsiltysandstreamflow deposits 44,458 20%

8,892 ImpactedTZLGFDeposits clayrichchannelwallfailure deposits 277,830 10%

27,783 Notes:

TZTransitionZone UGFUpperGullyFill LGFLowerGullyFill ft3cubicfeet 1CalculatedusingEarthVolumetricStudiosoftwareapplication.SedimentandgroundwaterdepthsimportedintoEVSweretakenfromTZboringsdepictedon crosssectionsAA'throughEE'.Highestgroundwatersurfaceelevationsdepictedoncrosssectionswereusedtodeterminesaturatedthicknessandvolume.

CalculatedbulksaturatedvolumewithintheuraniumimpactedportionoftheTZis609,606ft3.

2MaterialspecificeffectiveporosityvaluesbasedonreferencevaluesobtainedfromApplicationsofEnvironmentalChemistry-APracticalGuidefor EnvironmentalProfessionals (Weiner,2000).

11%

55,588 511,425 1 of 1 4/6/2018

Figure 4 - Plan View of Transition Zone Saturated Bedrock and Intra-Gully Stream Deposits - Burial Area 1

FIGURE 4 PLAN VIEW OF TRANSITION ZONE SATURATED BEDROCK AND INTRA-GULLY STREAM DEPOSITS BURIAL AREA 1 CIMARRON SITE, OKLAHOMA SATURATED TRANSITION ZONE / BEDROCK INTERFACE (AT THE WATER TABLE)

Figure 5 - Orthogonal View of Saturated Intra-Gully Stream Deposits and Bedrock - Burial Area 1

FIGURE 5 ORTHOGONAL VIEW OF SATURATED INTRA-GULLY DEPOSITS AND BED-ROCK BURIAL AREA 1 CIMARRON SITE, OKLAHOMA APPROXIMATE GROUND-WATER SURFACE

Figure 6 - Orthogonal View of Saturated Upper Gully Fill Deposits and Bedrock - Burial Area 1

FIGURE 6 ORTHOGONAL VIEW OF LOWER GULLY FILL DEPOSITS AND BEDROCK BURIAL AREA 1 CIMARRON SITE, OKLAHOMA APPROXIMATE GROUND-WATER SURFACE LOWERGULLY FILL APPROXIMATE VOLUME =

277,830 CUBIC FEET

Figure 7 - Orthogonal View of Saturated Lower Gully Fill Deposits and Bedrock - Burial Area 1

FIGURE 7 ORTHOGONAL VIEW OF UPPER GULLY FILL DEPOSITS AND BEDROCK BURIAL AREA 1 CIMARRON SITE, OKLAHOMA APPROXIMATE GROUND-WATER SURFACE UPPER GULLY FILL APPROXIMATE VOLUME =

189,137 CUBIC FEET

ML18100A297

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