Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash Paper 7191 Presented at: Waste Management 07’ Symposium Tuesday, February 25 - March 1, 2007 Session 29: Performance Assessment of Geological Disposal Systems Tuesday, February 27, 2007: 8:30 AM Tucson Convention Center Room: Coconino By: Arturo Woocay and John C. Walton Environmental Science and Engineering The University of Texas at El Paso
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Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash
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Multivariate Statistical Analyses of Groundwater Surrounding
Fortymile WashPaper 7191 Presented at:
Waste Management 07’ SymposiumTuesday, February 25 - March 1, 2007
Session 29:Performance Assessment of Geological Disposal Systems
Tuesday, February 27, 2007: 8:30 AMTucson Convention Center Room: Coconino
By:
Arturo Woocay and John C. Walton Environmental Science and Engineering
The University of Texas at El Paso
Acknowledgement
This work was funded by the Nye County, Nevada, Nuclear Waste Repository ProjectOffice through cooperative research grant DE-FC28-02RW12163 from the U.S. Department of Energy, Office of Civilian Radioactive Waste Management
February 27, 2007
Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 3
Overview
• Introduction• Yucca Mountain Region
• Amargosa Desert Region Water Levels
• Geochemical Data from the Region
• Previous Work
• Introduction to Multivariate Statistical Methods (MSM)
• Correspondence analysis (CA)
• k-means Cluster Analysis (KMCA)
February 27, 2007
Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 4
Overview (Cont’d)
• MSM Results• Nine separate hydrochemical facies
• At least two potential flowpaths
• Very distinct flowpath under Fortymile Wash
• Corroborating Isotopic Data• Oxygen-18
• Hydrogen-2
• Hydrogen-2 vs Oxygen-18 compared to GMWL
• Conclusions
February 27, 2007
Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 5
Amargosa Desert
Yu
cca
Mo
un
tain
Fo
rtym
ile W
ash
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Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 6
Amargosa Desert Region
Water
Levels
460000 480000 500000 520000 540000 560000 580000
3940000
3960000
3980000
4000000
4020000
4040000
4060000
4080000
4100000
D eathValley
D eathValley
Tim berM ountain
AshM eadows
Am argosa D esert
Southern Extentof
Am argosa R iver
CraterF lat
JackassFlat
Hw y 95
Hw y 95
Am argosaFlat
ShoshoneM ounta in
460000 480000 500000 520000 540000 560000 580000
3940000
3960000
3980000
4000000
4020000
4040000
4060000
4080000
4100000
Easting UTM Coordinates (m eters)
Nor
thin
g U
nive
rsal
Tra
nsve
rse
Mer
cato
r (U
TM) C
oord
inat
es (m
eter
s)
460000 485000 510000 535000 560000
3950000
3975000
4000000
4025000
4050000
4075000
4100000
Easting U TM Coordinates (m eters)
Nor
thin
g U
nive
rsal
Tra
nsve
rse
Mer
cato
r (U
TM) C
oord
inat
es (m
eter
s)
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Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 7
Major Ion Chemistry from the Amargosa Desert Region
Major IonspH
Ca2+ (mg/L)
Mg2+ (mg/L)
Na+ (mg/L)
K+ (mg/L)
Cl- (mg/L)
SO42- (mg/L)
Total Alkalinity (CaCO3 mg/L)
• 211 wells/springs
• Use MSM:
CA & KMCA
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Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 8
Major Ion Chemistry
Piper (Trilinear) Diagrams
1 0.8 0.6 0.4 0.2 0
Ca2+
0
0.2
0.4
0.6
0.8
10
0.2
0.4
0.6
0.8
1
Cations Piper Diagram
0 0.2 0.4 0.6 0.8 1
Cl-
1
0.8
0.6
0.4
0.2
01
0.8
0.6
0.4
0.2
0
Anions Piper Diagram
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Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 9
Introduction to MSM
• MSM are powerful tools for:• Investigating large complex data sets
• Identifying parameters that describe a system and its behavior
• Discovering patterns and relationships
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Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 10
Introduction to MSM (Cont’d)
• Some types of MSM:• Principal Component Analysis
Yucca M ountain W est FaceYucca M ountain East FaceM id Fortym ile W ash
East of Fortym ile W ashAm argosa Desert East
Am argosa Desert SWOasis Valley
H igh Ca & M g
High A lkalinity
Questions?
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Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 30
Predicted Saturated Zone Particle Trajectories from Yucca Mountain
From:
Technical Basis Document No 11:
Saturated Zone Flow and Transport Revision 2
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Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 31
ISIP Background• The Nuclear Waste Policy Act (NWPA) in 1983 directed DOE to develop
a geologic repository to dispose of the nation’s spent nuclear fuel and high-level waste.
• In 1987, Congress amended the NWPA and designated Yucca Mountain as the only site to be considered.
• The NWPA authorizes Nye County as the "site" jurisdiction and host county, to conduct on-site representation at Yucca Mountain.
• In 1987 Nye County Board of Commissioners creates the Nye County Nuclear Waste Repository Project Office (NWRPO) to monitor and assess the federal effort to find a repository site.
• In 1993, the County hired a full-time on-site representative and the Independent Scientific Investigations Program (ISIP) is established.
• Though ISIP the County gathers data for independent analysis of geologic and hydrologic conditions and monitors and reviews DOE's scientific characterization of Yucca Mountain
• ISIP activities involve drilling and instrumenting boreholes, analyzing the geology and geochemistry of drill cuttings, instrumenting tunnels and drifts, monitoring, data analysis, and numerical modeling activities to address the concerns of Nye County.
February 27, 2007
Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 32
ISIP Background• The Nuclear Waste Policy Act (NWPA) in 1983 directed DOE to develop
a geologic repository to dispose of the nation’s spent nuclear fuel and high-level waste.
• In 1987, Congress amended the NWPA and designated Yucca Mountain as the only site to be considered.
• The NWPA authorizes Nye County as the "site" jurisdiction and host county, to conduct on-site representation at Yucca Mountain.
• In 1987 Nye County Board of Commissioners creates the Nye County Nuclear Waste Repository Project Office (NWRPO) to monitor and assess the federal effort to find a repository site.
• In 1993, the County hired a full-time on-site representative and the Independent Scientific Investigations Program (ISIP) is established.
• Though ISIP the County gathers data for independent analysis of geologic and hydrologic conditions and monitors and reviews DOE's scientific characterization of Yucca Mountain
• ISIP activities involve drilling and instrumenting boreholes, analyzing the geology and geochemistry of drill cuttings, instrumenting tunnels and drifts, monitoring, data analysis, and numerical modeling activities to address the concerns of Nye County.
February 27, 2007
Woocay-Walton: Multivariate Statistical Analyses of Groundwater Surrounding Fortymile Wash 33
Nye County, Nevada
Located in the south-central portion of Nevada
• Third largest county in US (11,560,960 acres)
• About 22 % designated for federal restricted access or for U.S. government classified activities. Includes:
• Nevada Test Site• Nelis Air Force Range• Tonopah Test Range• Yucca Mountain Project