FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19,...
-
Upload
rodney-casey -
Category
Documents
-
view
215 -
download
1
Transcript of FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19,...
![Page 1: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/1.jpg)
FSA Groundwater Flow and FSA Groundwater Flow and Solute Transport ModelSolute Transport Model
Presentation to Scottsdale Citizens Group
March 19, 1999
![Page 2: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/2.jpg)
Overview of NIBW Site HistoryOverview of NIBW Site History
![Page 3: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/3.jpg)
Overview of WorkOverview of WorkComprehensive site characterizationSummary of Site conditions in RI/FSImplementation of ROD-required Remedy
– Capture and containment not achieved
Implementation of Enhanced Remedy– Capture and containment projected (preliminary data and
modeling)
Preparation of FSA– Additional support for capture and containment projections
(performance evaluation and modeling)
![Page 4: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/4.jpg)
Components of ROD-Required Components of ROD-Required RemedyRemedy
MAU & LAU extraction at wells COS31, COS71, COS72, and COS75
Monitoring of UAU mass fluxSoil vapor extraction at Areas 7, 8,
and 12
![Page 5: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/5.jpg)
Voluntary Components of the Voluntary Components of the Enhanced RemedyEnhanced RemedyCOS6 tie-in to the CGTF (MAU/LAU)Replacement LAU extraction at well
COS75ALAU extraction at well PCX-1MRTF for treatment of groundwater from
PCX-1, and PVWC#15 and #14UAU extraction at Area 7MAU extraction at Areas 7 and 12
![Page 6: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/6.jpg)
FSA Groundwater Flow and FSA Groundwater Flow and Solute Transport ModelSolute Transport Model
![Page 7: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/7.jpg)
PurposePurpose
Predictive tool for evaluating a range of remedial actions with respect to:– Capture and containment of the zones of
contamination (flow model) – Relative clean-up time (transport model)
![Page 8: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/8.jpg)
What is a Groundwater Flow and What is a Groundwater Flow and Solute Transport Model?Solute Transport Model?Mathematical representation of physical
system and processesGroundwater flow model - solves for
distribution of headContaminant transport model - solves
for concentration of solute as affected by physical and chemical processes
![Page 9: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/9.jpg)
Model Development ProcessModel Development Process
Development of conceptual modelModel constructionModel calibration Projection of future conditions
![Page 10: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/10.jpg)
Development of Conceptual Development of Conceptual Model - Vadose ZoneModel - Vadose ZoneShallow soil gas sampling programsInstallation and sampling of vapor
monitor wellsInstallation and sampling of soil
vapor extraction wellsAnalysis of potential groundwater
threat
![Page 11: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/11.jpg)
AREA 12
SVE
PROGRAM
![Page 12: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/12.jpg)
Conceptual Model - Vadose Conceptual Model - Vadose ZoneZoneGenerally coarse-grained sedimentsPrevious movement of mass from the
vadose zone to UAU groundwater at source areas
No current impact to groundwater above MCLs
![Page 13: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/13.jpg)
Development of Conceptual Development of Conceptual Model - UAUModel - UAU
Installation, testing, and monitoring of about 70 UAU monitor wells
Characterization of Southwest Margin
Inorganic water quality evaluation
![Page 14: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/14.jpg)
UAU
WATER LEVEL
CONTOURS
APRIL 1998
![Page 15: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/15.jpg)
UAU
TCE CONCENTRATION
CONTOURS
APRIL 1998
![Page 16: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/16.jpg)
SCHEMATIC OF SOUTHWEST MARGIN
HYDROGEOLOGY
![Page 17: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/17.jpg)
Conceptual Model - UAUConceptual Model - UAUGenerally coarse-grainedSmall saturated thickness in south, unsaturated
in north and west Flow from east to west or northeast to
southwest toward Southwest MarginDownward hydraulic gradients to MAUDownward flow toward underlying units at
Southwest MarginSmall TCE mass; decreasing over time
![Page 18: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/18.jpg)
Development of Conceptual Development of Conceptual Model - MAUModel - MAUInstallation, testing, and monitoring of
more than 50 MAU monitor wells Installation and testing of MAU
extraction wells at two source areasAquifer testing at production wellsConduit well investigationsSimulprobe sampling programCoring program
![Page 19: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/19.jpg)
UPPER MAU
WATER LEVEL
CONTOURS
APRIL 1998
![Page 20: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/20.jpg)
LOWER MAU
WATER LEVEL
CONTOURS
APRIL 1998
![Page 21: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/21.jpg)
UPPER MAU
TCE CONCENTRATION
CONTOURS
APRIL 1998
![Page 22: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/22.jpg)
LOWER MAU
TCE CONCENTRATION
CONTOURS
APRIL 1998
![Page 23: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/23.jpg)
BOREHOLE FLOW UNDER
NON-PUMPING
CONDITIONS
![Page 24: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/24.jpg)
CORE SAMPLES FROM MAU MONITOR WELL PG-46MA
![Page 25: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/25.jpg)
SIMULPROBE SAMPLER
![Page 26: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/26.jpg)
MAU CROSS-SECTION
AREA 7
![Page 27: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/27.jpg)
MAU CROSS-SECTION
AREA 12
![Page 28: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/28.jpg)
Conceptual Model - MAUConceptual Model - MAU
Generally fine-grained with thin coarse-grained interbeds
More coarse-grained interbeds in upper MAU
Convergent flow toward OU extraction wells and Southwest Margin
Downward hydraulic gradients to LAUTCE primarily in upper MAU
![Page 29: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/29.jpg)
Development of Conceptual Development of Conceptual Model - LAUModel - LAUInstallation, testing, and monitoring of
more that 30 LAU monitor wellsRegional water level surveyInstallation and testing of extraction
wells COS75A and PCX-1Fluid movement and depth-sampling
investigationsAquifer testing at production wells
![Page 30: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/30.jpg)
LAU
WATER LEVEL
CONTOURS
APRIL 1998
![Page 31: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/31.jpg)
REGIONAL LAU
WATER LEVEL
CONTOURS
1996
![Page 32: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/32.jpg)
EXTRACTION WELL COS75A
INSTALLATION
![Page 33: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/33.jpg)
EXTRACTION WELL PCX-1
INSTALLATION
![Page 34: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/34.jpg)
HYDROGEOLOGIC DATA FOR
EXTRACTION WELL PCX-1
![Page 35: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/35.jpg)
FLUID MOVEMENT LOGGING
![Page 36: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/36.jpg)
SPINNER
FLOWMETER
TOOL
![Page 37: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/37.jpg)
DEPTH
SAMPLING
![Page 38: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/38.jpg)
BOREHOLE FLOW UNDER
PUMPING CONDITIONS
![Page 39: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/39.jpg)
LAU CROSS-SECTION
![Page 40: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/40.jpg)
Conceptual Model - LAUConceptual Model - LAUGenerally coarse-grained with fine-grained
interbedsIncreasing lithification and consolidation
with depthDecreasing permeability and yield with depthConvergent flow toward PVWC wellfieldTCE concentrations generally largest in
upper LAU
![Page 41: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/41.jpg)
Model Development ProcessModel Development Process
Development of conceptual modelModel constructionModel calibration Projection of future conditions
![Page 42: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/42.jpg)
Model ConstructionModel ConstructionDefine model domainAssign model boundary conditionsDevelop model gridDefine model layersAssign pumpage at production wells to
model layersAssign hydraulic parametersAssign initial water level and TCE conditions
![Page 43: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/43.jpg)
FSA
MODEL
DOMAIN
AND
BOUNDARIES
(66 sq. mi.)
GENERAL HEAD
BOUNDARY
GENERAL HEAD
BOUNDARY
NO
FL
OW
BO
UN
DA
RY
N
O F
LO
W
BO
UN
DA
RY
![Page 44: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/44.jpg)
FSA
MODEL
GRID
max = 1,320 ft
min = 200 ft
![Page 45: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/45.jpg)
MODEL LAYERS
1
2
3
4
5
6
7
8
9
10
![Page 46: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/46.jpg)
PUMPING
DISTRIBUTION
BETWEEN
MODEL LAYERS
![Page 47: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/47.jpg)
UPPER MAU
(LAYER 3)
PERCENT
COARSE-GRAINED
SEDIMENTS
![Page 48: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/48.jpg)
UPPER MAU (LAYER
3)
TRANSMISSIVITY
DISTRIBUTION
FROM
PUMPING TESTS
![Page 49: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/49.jpg)
LAYER 3
TRANSMISSIVITY
DISTRIBUTION
FROM MODEL
![Page 50: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/50.jpg)
Model Development ProcessModel Development Process
Development of conceptual modelModel constructionModel calibration Projection of future conditions
![Page 51: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/51.jpg)
Model CalibrationModel Calibration
Process of adjusting parameters within bounds of data to obtain best match to observed conditions
Calibration period– 1990 through 1996– Selected based on data availability
![Page 52: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/52.jpg)
COMPARISON OF
OBSERVED
(APRIL 1997)
AND SIMULATED
WATER LEVELSUAU
SIMULATED
OBSERVED
![Page 53: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/53.jpg)
COMPARISON OF
OBSERVED
(APRIL 1997)
AND SIMULATED
WATER LEVELSMAU
SIMULATED
OBSERVED
![Page 54: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/54.jpg)
COMPARISON OF
OBSERVED
(APRIL 1997)
AND SIMULATED
WATER LEVELS
LAU
SIMULATED
OBSERVED
![Page 55: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/55.jpg)
COMPARISON OF
OBSERVED
(APRIL 1997) AND
SIMULATED TCE
CONCENTRATIONS
UAU
SIMULATED
OBSERVED
![Page 56: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/56.jpg)
COMPARISON OF
OBSERVED
(APRIL 1997) AND
SIMULATED TCE
CONCENTRATIONSMAU
SIMULATED
OBSERVED
![Page 57: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/57.jpg)
COMPARISON OF
OBSERVED
(APRIL 1997) AND
SIMULATED TCE
CONCENTRATIONSLAU
SIMULATED
OBSERVED
![Page 58: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/58.jpg)
Model Development ProcessModel Development Process
Development of conceptual modelModel constructionModel calibration Projection of future conditions
![Page 59: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/59.jpg)
Projection of Future ConditionsProjection of Future ConditionsPrepare pumping input files – Based on projections by water providers– Generally reflect 1996 conditions
Compare ROD Required and Enhanced Remedial Alternatives
Simulate range of potential additional Remedial Actions
Simulate combinations of Remedial Actions comprising potential Remedial Alternatives
![Page 60: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/60.jpg)
Total Mass Removed, Year 2008
0
20000
40000
60000
80000
100000
120000
140000
ROD ENH
Alternative
Pou
nds
of M
ass
Rem
oved
SWMARG-NEW
NEW LAU-3
NEW LAU-2
NEW LAU-1
MILLER/McD
7EXNEW-2
7EXNEW-1
7EX-4MA
7EX-3MA
7EX -1&2
Granite Reef
12M-EX1
PVWC-14
PVWC-15
PCX-1
COS-75A
COS-75
COS-72
COS-71
COS-31
COS-6
![Page 61: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/61.jpg)
Total Mass Removed, Year 2028
0
20000
40000
60000
80000
100000
120000
140000
ROD ENH
Alternative
Pou
nds
of M
ass
Rem
oved
SWMARG-NEW
NEW LAU-3
NEW LAU-2
NEW LAU-1
MILLER/McD
7EXNEW-2
7EXNEW-1
7EX-4MA
7EX-3MA
7EX -1&2
Granite Reef
12M-EX1
PVWC-14
PVWC-15
PCX-1
COS-75A
COS-75
COS-72
COS-71
COS-31
COS-6
EnhancedROD
![Page 62: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/62.jpg)
L ayer 3 T C E L ev els, R eq u ired an d E n h an ced A ltern ativ es Y ear 202 8
R e q u ire d
E n h a n c e d
Layer 3 TCE Concentrations ROD-Required and Enhanced Remedies, Year 2028
![Page 63: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/63.jpg)
L ayer 6 T C E L ev els, R eq u ired an d E n h an ced A ltern ativ es Y ear 202 8
R e q u ire d
E n h a n c e d
Layer 6 TCE Concentrations ROD-Required and Enhanced Remedies, Year 2028
![Page 64: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/64.jpg)
Estimated TCE Wellhead ConcentrationsCOS 71
0
50
100
150
200
250
300
1990 2000 2010 2020 2030 2040 2050
Year
TC
E C
once
ntra
tion
(ug
/l)
Required Remedy
Enhanced Remedy
![Page 65: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/65.jpg)
Estimated TCE Wellhead ConcentrationsCOS 72
0
50
100
150
200
250
300
1990 2000 2010 2020 2030 2040 2050
Year
TC
E C
once
ntra
tion
(ug
/l)
Required Remedy
Enhanced Remedy
![Page 66: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/66.jpg)
Estimated TCE Wellhead ConcentrationsPVWC 15
0
20
40
60
80
100
120
140
1990 2000 2010 2020 2030 2040 2050
Year
TC
E C
once
ntra
tion
(ug
/l)
Required Remedy
Enhanced Remedy
![Page 67: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/67.jpg)
Estimated TCE Wellhead ConcentrationsPVWC 14
0
20
40
60
80
100
120
140
1990 2000 2010 2020 2030 2040 2050
Year
TC
E C
once
ntra
tion
(ug
/l)
Required Remedy
Enhanced Remedy
![Page 68: FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.](https://reader036.fdocuments.us/reader036/viewer/2022062801/56649e2c5503460f94b1c014/html5/thumbnails/68.jpg)
Anticipated Schedule for FSA Anticipated Schedule for FSA ProcessProcess Draft FSA submitted 3/29/99 EPA comments received ~ 5/1/99 Final FSA submitted ~ 6/1/99 EPA issues Proposed Plan ~ 7/1/99 Negotiation of new/amended
CD begun~ 7/1/99
ROD issued ~ 9/1/99 Draft CD completed ??