FSA Groundwater Flow and Solute Transport Model - PowerPoint PPT Presentation

Loading...

PPT – FSA Groundwater Flow and Solute Transport Model PowerPoint presentation | free to download - id: 16ad1-NTUzN



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

FSA Groundwater Flow and Solute Transport Model

Description:

FSA Groundwater Flow and Solute Transport Model. Presentation to Scottsdale Citizens Group ... Groundwater flow model - solves for distribution of head ... – PowerPoint PPT presentation

Number of Views:304
Avg rating:3.0/5.0
Slides: 69
Provided by: lesli8
Learn more at: http://www.motorola.com
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: FSA Groundwater Flow and Solute Transport Model


1
FSA Groundwater Flow and Solute Transport Model
  • Presentation to Scottsdale Citizens Group
  • March 19, 1999

2
Overview of NIBW Site History
3
Overview of Work
  • Comprehensive site characterization
  • Summary of Site conditions in RI/FS
  • Implementation 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)

4
Components of ROD-Required Remedy
  • MAU LAU extraction at wells COS31, COS71,
    COS72, and COS75
  • Monitoring of UAU mass flux
  • Soil vapor extraction at Areas 7, 8, and 12

5
Voluntary Components of the Enhanced Remedy
  • COS6 tie-in to the CGTF (MAU/LAU)
  • Replacement LAU extraction at well COS75A
  • LAU extraction at well PCX-1
  • MRTF for treatment of groundwater from PCX-1, and
    PVWC15 and 14
  • UAU extraction at Area 7
  • MAU extraction at Areas 7 and 12

6
FSA Groundwater Flow and Solute Transport Model
7
Purpose
  • 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)

8
What is a Groundwater Flow and Solute Transport
Model?
  • Mathematical representation of physical system
    and processes
  • Groundwater flow model - solves for distribution
    of head
  • Contaminant transport model - solves for
    concentration of solute as affected by physical
    and chemical processes

9
Model Development Process
  • Development of conceptual model
  • Model construction
  • Model calibration
  • Projection of future conditions

10
Development of Conceptual Model - Vadose Zone
  • Shallow soil gas sampling programs
  • Installation and sampling of vapor monitor wells
  • Installation and sampling of soil vapor
    extraction wells
  • Analysis of potential groundwater threat

11
AREA 12 SVE PROGRAM
12
Conceptual Model - Vadose Zone
  • Generally coarse-grained sediments
  • Previous movement of mass from the vadose zone to
    UAU groundwater at source areas
  • No current impact to groundwater above MCLs

13
Development of Conceptual Model - UAU
  • Installation, testing, and monitoring of about 70
    UAU monitor wells
  • Characterization of Southwest Margin
  • Inorganic water quality evaluation

14
UAU WATER LEVEL CONTOURS APRIL 1998
15
UAU TCE CONCENTRATION CONTOURS APRIL 1998
16
SCHEMATIC OF SOUTHWEST MARGIN HYDROGEOLOGY
17
Conceptual Model - UAU
  • Generally coarse-grained
  • Small saturated thickness in south, unsaturated
    in north and west
  • Flow from east to west or northeast to southwest
    toward Southwest Margin
  • Downward hydraulic gradients to MAU
  • Downward flow toward underlying units at
    Southwest Margin
  • Small TCE mass decreasing over time

18
Development of Conceptual Model - MAU
  • Installation, testing, and monitoring of more
    than 50 MAU monitor wells
  • Installation and testing of MAU extraction wells
    at two source areas
  • Aquifer testing at production wells
  • Conduit well investigations
  • Simulprobe sampling program
  • Coring program

19
UPPER MAU WATER LEVEL CONTOURS APRIL 1998
20
LOWER MAU WATER LEVEL CONTOURS APRIL 1998
21
UPPER MAU TCE CONCENTRATION CONTOURS APRIL 1998
22
LOWER MAU TCE CONCENTRATION CONTOURS APRIL 1998
23
BOREHOLE FLOW UNDER NON-PUMPING CONDITIONS
24
CORE SAMPLES FROM MAU MONITOR WELL PG-46MA
25
SIMULPROBE SAMPLER
26
MAU CROSS-SECTION AREA 7
27
MAU CROSS-SECTION AREA 12
28
Conceptual 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 LAU
  • TCE primarily in upper MAU

29
Development of Conceptual Model - LAU
  • Installation, testing, and monitoring of more
    that 30 LAU monitor wells
  • Regional water level survey
  • Installation and testing of extraction wells
    COS75A and PCX-1
  • Fluid movement and depth-sampling investigations
  • Aquifer testing at production wells

30
LAU WATER LEVEL CONTOURS APRIL 1998
31
REGIONAL LAU WATER LEVEL CONTOURS 1996
32
EXTRACTION WELL COS75A INSTALLATION
33
EXTRACTION WELL PCX-1 INSTALLATION
34
HYDROGEOLOGIC DATA FOR EXTRACTION WELL PCX-1
35
FLUID MOVEMENT LOGGING
36
SPINNER FLOWMETER TOOL
37
DEPTH SAMPLING
38
BOREHOLE FLOW UNDER PUMPING CONDITIONS
39
LAU CROSS-SECTION
40
Conceptual Model - LAU
  • Generally coarse-grained with fine-grained
    interbeds
  • Increasing lithification and consolidation with
    depth
  • Decreasing permeability and yield with depth
  • Convergent flow toward PVWC wellfield
  • TCE concentrations generally largest in upper LAU

41
Model Development Process
  • Development of conceptual model
  • Model construction
  • Model calibration
  • Projection of future conditions

42
Model Construction
  • Define model domain
  • Assign model boundary conditions
  • Develop model grid
  • Define model layers
  • Assign pumpage at production wells to model
    layers
  • Assign hydraulic parameters
  • Assign initial water level and TCE conditions

43

GENERAL HEAD BOUNDARY
FSA MODEL DOMAIN AND BOUNDARIES (66 sq. mi.)
NO FLOW BOUNDARY
NO FLOW BOUNDARY
GENERAL HEAD BOUNDARY
44
FSA MODEL GRID max 1,320 ft min 200 ft
45
1 2 3 4 5 6 7 8 9 10
MODEL LAYERS
46
PUMPING DISTRIBUTION BETWEEN MODEL LAYERS
47
UPPER MAU (LAYER 3) PERCENT COARSE-GRAINED SEDIMEN
TS
48
UPPER MAU (LAYER 3) TRANSMISSIVITY DISTRIBUTION FR
OM PUMPING TESTS
49
LAYER 3 TRANSMISSIVITY DISTRIBUTION FROM MODEL
50
Model Development Process
  • Development of conceptual model
  • Model construction
  • Model calibration
  • Projection of future conditions

51
Model 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

52

COMPARISON OF OBSERVED (APRIL 1997) AND
SIMULATED WATER LEVELS
SIMULATED
OBSERVED
UAU
53

COMPARISON OF OBSERVED (APRIL 1997) AND
SIMULATED WATER LEVELS
SIMULATED
OBSERVED
MAU
54

COMPARISON OF OBSERVED (APRIL 1997) AND
SIMULATED WATER LEVELS
SIMULATED
OBSERVED
LAU
55

COMPARISON OF OBSERVED (APRIL 1997) AND
SIMULATED TCE CONCENTRATIONS
SIMULATED
OBSERVED
UAU
56

COMPARISON OF OBSERVED (APRIL 1997) AND
SIMULATED TCE CONCENTRATIONS
SIMULATED
OBSERVED
MAU
57
COMPARISON OF OBSERVED (APRIL 1997) AND
SIMULATED TCE CONCENTRATIONS
SIMULATED
OBSERVED
LAU
58
Model Development Process
  • Development of conceptual model
  • Model construction
  • Model calibration
  • Projection of future conditions

59
Projection of Future Conditions
  • Prepare 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

60
(No Transcript)
61
Enhanced
ROD
62
Layer 3 TCE Concentrations ROD-Required and
Enhanced Remedies, Year 2028
63
Layer 6 TCE Concentrations ROD-Required and
Enhanced Remedies, Year 2028
64
(No Transcript)
65
(No Transcript)
66
(No Transcript)
67
(No Transcript)
68
Anticipated Schedule for FSA Process
About PowerShow.com