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Moffett Groundwater Update
        May 15, 2008

      Julie Crosby-Brooks
    Remedial Project Manager




                1
Presentation Overview



•   Base-wide Groundwater Monitoring
     – Water Level Measurements
     – Groundwater Sampling
...
Introduction – Regional
     Location Map




           3
Introduction – Plan View of
      Regional Plume




             4
Moffett Aquifers



Approximate Depths of Moffett Aquifers

•   Upper A-Aquifer: 0 - 35 Feet Below Ground Surface (BGS)

•...
Introduction – Aquifers




           6
Basewide GW Program –
                   Groundwater Elevations
Groundwater Elevation Measurements
• Joint Effort with Mid...
Basewide GW Program –
  2006 Water Levels




          8
Basewide GW Program –
                       Groundwater Sampling
Groundwater Sampling
• Joint Effort with MEW Companies a...
Basewide GW Program – 2006
                Annual Report Conclusions

Site 28 - WATS
• Groundwater Consistently Flows to t...
Site 28 – Introduction


Site 28 - Introduction

•   Located West of the
    Runways

•   Contamination is from Navy
    S...
Site 28 – WATS Wells



                  N




          12
Site 28 – WATS Overview

WATS is a Groundwater Pump and Treat System

•   Began Operating in 1998
•   Complies with Requir...
Site 28 – WATS




       14
Site 28 – WATS Operation Data

2007 Operation Data

•   WATS Operational 98.9% of Time
•   Treated 34,532,488 Gallons of E...
Site 28 – Coordination with
                       MEW Companies

Currently Partnering with MEW Companies to Prepare Site-...
Site 26 – Introduction

Site 26 - Introduction
• Located East of the Runways
• Contamination is from Navy Sources Only (No...
Site 26 – EATS Overview &
                       Operation Data

East-Side Aquifer Treatment System - EATS
• Operated from...
Site 26 – EATS




       19
Site 26 Draft Technical
                         Memorandum




•   Reviewed Site Hydrogeology

•   In Depth Evaluation of...
Site 26 Draft Tech Memo –
      Hydrogeology Evaluation

In Depth Evaluation of Contamination
•   Low Concentration
•   Pl...
Site 26 Draft Tech Memo – Remedial
                       Alternatives

               Evaluated for Implementabilty and E...
Site 26 Draft Tech Memo – Remedial
                Alternatives


  Remedial Alternatives that are Effective and Implement...
Site 26 Draft Tech Memo



Site 26 Technical Memorandum Conclusions
• No Remedial Alternative can be Implemented Without I...
Summary – Moffett
                   Groundwater Program



Moffett Groundwater Program Path Forward

•   Continue Groundw...
Questions




    26
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Navy presentation to the Moffett Field Restoration Advisory Board on May 15, 2008, regarding the EATS/WATS groundwater clean-up.

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Navy presentation to the Moffett Field Restoration Advisory Board on May 15, 2008, regarding the groundwater clean-up at the East- and West-Side Acquifer Treatment Systems (EATS and WATS).

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Navy presentation to the Moffett Field Restoration Advisory Board on May 15, 2008, regarding the EATS/WATS groundwater clean-up.

  1. 1. Moffett Groundwater Update May 15, 2008 Julie Crosby-Brooks Remedial Project Manager 1
  2. 2. Presentation Overview • Base-wide Groundwater Monitoring – Water Level Measurements – Groundwater Sampling • Site 28 – WATS Overview – Coordination with MEW Companies and NASA – Path Forward • Site 26 – EATS Overview – EATS Technical Memorandum – Path Forward 2
  3. 3. Introduction – Regional Location Map 3
  4. 4. Introduction – Plan View of Regional Plume 4
  5. 5. Moffett Aquifers Approximate Depths of Moffett Aquifers • Upper A-Aquifer: 0 - 35 Feet Below Ground Surface (BGS) • Lower A-Aquifer: 35 – 55 Feet BGS • B Aquifer: 55 – 160 Feet BGS • C Aquifer: 160 – 240 Feet BGS • Deep Aquifer: Greater than 240 Feet BGS 5
  6. 6. Introduction – Aquifers 6
  7. 7. Basewide GW Program – Groundwater Elevations Groundwater Elevation Measurements • Joint Effort with Middlefield-Ellis-Whisman (MEW) Companies and NASA • Water Levels Measured in March and November • Results are Compiled and Evaluated in Annual Groundwater Reports – 2007 Annual Groundwater Report Available in June 2008 • Upper and Lower A-Aquifer Wells and B-Aquifer Wells ________________________ One Day Event – Twice a Year 1000+ Total Water Level Measurements 400+ Water Level Measurements Collected by Navy Approximately 20 Navy Field Crews _______________________ 7
  8. 8. Basewide GW Program – 2006 Water Levels 8
  9. 9. Basewide GW Program – Groundwater Sampling Groundwater Sampling • Joint Effort with MEW Companies and NASA • Sampling Conducted in November / December Timeframe • Results are Compiled and Evaluated in Annual Groundwater Reports – 2007 Annual Groundwater Report Available in June 2008 • Upper and Lower A-Aquifer Wells and B-Aquifer Wells _______________________ 600+ Wells Sampled North of Highway 101 Navy Samples Approximately 125 of the Wells Volatile Organic Compounds (VOCs) Dissolved Metals & Total Petroleum Hydrocarbons (TPH) - Every 5 Years _______________________ 9
  10. 10. Basewide GW Program – 2006 Annual Report Conclusions Site 28 - WATS • Groundwater Consistently Flows to the North • Dissolved VOCs Continue to Flow onto Moffett Site 26 - EATS • Groundwater Consistently Flows to the North • VOC Plume Stable – No Movement or Shape Change 10
  11. 11. Site 28 – Introduction Site 28 - Introduction • Located West of the Runways • Contamination is from Navy Sources and Regional Plume • Includes West-Side Aquifers Treatment System – WATS 11
  12. 12. Site 28 – WATS Wells N 12
  13. 13. Site 28 – WATS Overview WATS is a Groundwater Pump and Treat System • Began Operating in 1998 • Complies with Requirements in the MEW Study Area Record of Decision (ROD) – MEW ROD Finalized in 1989 – Navy Adopted MEW ROD in 1993 • Six Upper A-aquifer and Three Lower A-aquifer Extraction Wells • Treats Groundwater Using Advanced Oxidation Process and Granular Activated Carbon • Treated Water is Discharged to the Eastern Diked Marsh and Stormwater Retention Pond (Northern Moffett Boundary) – Discharged per the Requirements of the National Pollutant Discharge Elimination System (NPDES) Permit – All Discharge Water has been Compliant with NPDES Requirements 13
  14. 14. Site 28 – WATS 14
  15. 15. Site 28 – WATS Operation Data 2007 Operation Data • WATS Operational 98.9% of Time • Treated 34,532,488 Gallons of Extracted Groundwater • Removed 378 Pounds VOCs • Annual O&M cost is approx $760,644 or $2,012/pound Lifetime Operation Data • Treated 304,302,868 Gallons of Extracted Groundwater • Removed 3,997 Pounds VOCs 15
  16. 16. Site 28 – Coordination with MEW Companies Currently Partnering with MEW Companies to Prepare Site-wide Focused Feasibility Study (FFS) and Technical Impracticability (TI) Evaluation • Evaluates Effectiveness of the Current Remedy • Evaluates and Compares Alternatives for Site-Wide Groundwater Cleanup Submitted Volume I (Sections 1 through 5) to EPA on April 14, 2008 16
  17. 17. Site 26 – Introduction Site 26 - Introduction • Located East of the Runways • Contamination is from Navy Sources Only (Not Part of Regional Plume) • Includes East-Side Aquifer Treatment System – EATS 17
  18. 18. Site 26 – EATS Overview & Operation Data East-Side Aquifer Treatment System - EATS • Operated from January 1999 Through July 2003 • Five Upper A-Aquifer Extraction Wells • Treats Groundwater Using an Air Stripper and Granular Activated Carbon EATS Lifetime Operation Data • Removed 67 Million Gallons of Groundwater • Approximately 23.6 Pounds VOCs EATS Taken Off-Line in 2003 to Evaluate: • Plume Stability • Chemical of Concern Rebound • Natural Attenuation • Application of Hydrogen Release Compound® (HRC) 18
  19. 19. Site 26 – EATS 19
  20. 20. Site 26 Draft Technical Memorandum • Reviewed Site Hydrogeology • In Depth Evaluation of Contamination • Evaluation of Remedial Alternatives Sand Thickness Evaluation 20
  21. 21. Site 26 Draft Tech Memo – Hydrogeology Evaluation In Depth Evaluation of Contamination • Low Concentration • Plume Contracts with Depth • Residual Limited Contamination Remains in Fine- Grained Soils 21
  22. 22. Site 26 Draft Tech Memo – Remedial Alternatives Evaluated for Implementabilty and Effectiveness Optimized Pump and Treat System Combination of Biotic and Abiotic Treatment Air Sparging / Soil Vapor Extraction Phytoremediation Dual Phase Extraction Monitored Natural Attenuation Substrate Enhanced Biostimulation In-Situ Chemical Oxidation Bioaugmentation In-Situ Thermal Treatment Micro-Scale Zero Valent Iron – Nanoscale Zero Valent Iron 22
  23. 23. Site 26 Draft Tech Memo – Remedial Alternatives Remedial Alternatives that are Effective and Implementable Screened Out Based on Cost Micro-Scale Zero Valent Iron – $40 Million Nanoscale Zero Valent Iron - $46 Million Combination of Biotic and Abiotic Treatment - $13 to $14 Million 23
  24. 24. Site 26 Draft Tech Memo Site 26 Technical Memorandum Conclusions • No Remedial Alternative can be Implemented Without Inordinate Costs – Complex Site Hydrogeology • Recommend Evaluating Technical Impracticability Waiver Navy Will Coordinate with Regulatory Agencies to Develop Path Forward 24
  25. 25. Summary – Moffett Groundwater Program Moffett Groundwater Program Path Forward • Continue Groundwater Sampling and Water Level Measurements – Next Groundwater Sampling Occurs in November / December 2008 • Continue to Operate Pump and Treat System at WATS • Continue Working with MEW Companies to Finalize FFS • Work with Regulatory Agencies to Determine Path Forward at EATS 25
  26. 26. Questions 26

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