FSA Groundwater Flow and Solute Transport Model. Presentation to Scottsdale Citizens Group March 19, 1999
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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 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 PVWC#15 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 coarsegrained 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 finegrained 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 GENERAL HEAD BOUNDARY FSA MODEL DOMAIN AND BOUNDARIES (66 sq. mi.) NO FLOW BOUNDARY NO FLOW BOUNDARY
44 FSA MODEL GRID max = 1,320 ft min = 200 ft
45 MODEL LAYERS
46 PUMPING DISTRIBUTION BETWEEN MODEL LAYERS
47 UPPER MAU (LAYER 3) PERCENT COARSE-GRAINED SEDIMENTS
48 UPPER MAU (LAYER 3) TRANSMISSIVITY DISTRIBUTION FROM 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 UAU OBSERVED
53 COMPARISON OF OBSERVED (APRIL 1997) AND SIMULATED WATER LEVELS SIMULATED MAU OBSERVED
54 COMPARISON OF OBSERVED (APRIL 1997) AND SIMULATED WATER LEVELS SIMULATED OBSERVED LAU
55 COMPARISON OF OBSERVED (APRIL 1997) AND SIMULATED TCE CONCENTRATIONS SIMULATED UAU OBSERVED
56 COMPARISON OF OBSERVED (APRIL 1997) AND SIMULATED TCE CONCENTRATIONS SIMULATED MAU OBSERVED
57 COMPARISON OF OBSERVED (APRIL 1997) AND SIMULATED TCE CONCENTRATIONS SIMULATED LAU OBSERVED
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 Total Mass Removed, Year 2008 Pounds of Mass Removed ROD Alternative ENH 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
61 Total Mass Removed, Year 2028 Pounds of Mass Removed ROD Alternative Enhanced ENH 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
62 Layer 3 TCE Concentrations ROD-Required and Enhanced Remedies, Year 2028 Required Enhanced
63 Layer 6 TCE Concentrations ROD-Required and Enhanced Remedies, Year 2028 Required Enhanced
64 Estimated TCE Wellhead Concentrations COS TCE Concentration (ug/l) Required Remedy Enhanced Remedy Year
65 Estimated TCE Wellhead Concentrations COS TCE Concentration (ug/l) Required Remedy Enhanced Remedy Year
66 Estimated TCE Wellhead Concentrations PVWC TCE Concentration (ug/l) Required Remedy Enhanced Remedy Year
67 Estimated TCE Wellhead Concentrations PVWC TCE Concentration (ug/l) Required Remedy Enhanced Remedy Year
68 Anticipated Schedule for FSA Process 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 ~ 7/1/99 CD begun ROD issued ~ 9/1/99 Draft CD completed??
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