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Preliminary Results of System 2A MODFLOW/MT3DMS Simulations at Fort Ord A-Aquifer

This report discusses the preliminary results from the System 2A MODFLOW/MT3DMS simulations conducted at Fort Ord A-Aquifer. The model setup includes multiple layers, porosity values, and parameters related to advection and dispersion. Key updates since December 2009, such as adjustments to injection and extraction rates and revised K zone values based on new slug test data, are presented. Results of various simulation timeframes, including substrate injection and recirculation processes, are provided for discussion only and aimed at guiding future modeling efforts.

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Preliminary Results of System 2A MODFLOW/MT3DMS Simulations at Fort Ord A-Aquifer

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  1. Fort Ord A-Aquifer MODFLOW/MT3DMS Simulations Revised System 2a Prelim Results - System 2A - For Discussion Only 1

  2. Model Setup • Model layers • 2 layers within upper sand • 1 layer for silt/clay • Porosity • Sand layers: 0.25 • Silt/clay: 0.35 • MT3DMS Parameters • Advection • Dispersion • Longitudinal: 0.001 • Ratio of transverse to longitudinal: 0.2 • Ratio of Vertical to longitudinal: 0.1 • Source/Sinks • Sodium lactate applied via injection wells Prelim Results - System 2A - For Discussion Only 2

  3. System 2APrevious Model Schedule Prelim Results - System 2A - For Discussion Only 3

  4. Injection & Extraction Rates Prelim Results - System 2A - For Discussion Only 4

  5. Changes since December 2009Model Runs Injection well rates adjusted Extraction well rates adjusted Layer elevations and K values updated Injection and Extraction Wells indicated by red symbols Prelim Results - System 2A - For Discussion Only 5

  6. Updated K Zones based on new slug test data 10 3 3 0.75 to 9 2 to 9.5 6 Updated K values (ft/day) shown in yellow Prelim Results - System 2A - For Discussion Only 6

  7. System 2ARevised Schedule Prelim Results - System 2A - For Discussion Only 7

  8. 11 days Prelim Results - System 2A - For Discussion Only 8

  9. 28 days Prelim Results - System 2A - For Discussion Only 9

  10. 60 days Last day of substrate injection Prelim Results - System 2A - For Discussion Only 10

  11. 70 days10 Days of Recirculation Prelim Results - System 2A - For Discussion Only 11

  12. 88 days3 days post recirculation Prelim Results - System 2A - For Discussion Only 12

  13. 110 days25 days post recirculation Prelim Results - System 2A - For Discussion Only 13

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