Installation Restoration Sites 26 and 28


  Abiotic / Biotic Treatability Study




     Restoration Advisory Board Meeti...
IR Site 26 Treatability Study


Purpose of Treatability Test
  Determine if combined abiotic/biotic treatment is a viable ...
Hypothesized Reaction Pathways

        Biotic                                  Abiotic
           PCE                    ...
Indicators of Degradation Pathway

                                   Abiotic Pathway
    Biotic Pathway
                 ...
Tetrachloroethene (PCE)
Trichloroethene (TCE)
Dichloroethene (DCE)
Radius of EHC Distribution Evaluation
pH                                                                                       Oxidation-Reduction Potential
   ...
Arsenic                                                                                                Manganese
         ...
Ethenes & Ethane- Molar Concentration
                                         Average Inside Treatment Area
             ...
Ethenes & Ethane- Molar Concentration
                                       Average Outside of Treatment Area
           ...
Ethenes & Ethane - Molar Concentration
                                     Average Downgradient of Treatment Area
       ...
W-AB-3 (Upgradient, 7 to 17 ft bgs)
                                     Ethenes & Ethane - Molar Concentration

         ...
Relative Fraction of CEs, Ethene and Ethane


                                         EXW-1
             Treatment Area W...
Relative Fraction of CEs, Ethene and Ethane




                     W-AB-1
Downgradient Wells




                     W-...
Preliminary Conclusions Site 26 TS



• pH, ORP, SC, T, in the treatment area are within the range
  considered appropriat...
26 Treatability Study Schedule



January, 5, 2010 -2nd Quarter GW Sampling Event


March 29, 2010 – 3rd Quarter GW Sampli...
Expanded Pilot Test (Site 28) Methodology


Evaluate Three Technologies:
  In Situ Anaerobic Biotic/Abiotic Degradation (I...
Expanded Pilot Test Site 28




     Well W9-19                                              ISABB - Emulsfied
           ...
Site 28 Pilot Test Schedule




February 2010 - Work Plans Finalized

March 2010 - MIPs Investigation

May 2010 -Treatabil...
Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)
Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)
Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)
Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)
Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)
Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)
Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)
Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)
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Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)

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Progress Report - Sites 26 (EATS) and 28 (WATS)
Restoration Advisory Board
Former NAS Moffett Field
January 14, 2010
Julie Crosby, Navy, and Dan Leigh, Shaw Group

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Moffett RAB Progress Report- Sites 26 (EATS) and 28 (WATS)

  1. 1. Installation Restoration Sites 26 and 28 Abiotic / Biotic Treatability Study Restoration Advisory Board Meeting January 14, 2010
  2. 2. IR Site 26 Treatability Study Purpose of Treatability Test Determine if combined abiotic/biotic treatment is a viable remedial alternative for mitigating the remaining chlorinated ethenes (CEs) present in the upper portion of the A-aquifer at IR Site 26. Treatability Study Method: Conduct Pilot Test in area of highest CE concentration in upper A-Aquifer at Site 26 Pilot Test Method: Install wells in Pilot Test area Determine baseline conditions in pilot test area Inject EHC® into Aquifer Measure Distribution of EHC® Measure changes in pilot test area geochemistry Measure changes in pilot test area CE concentrations 2
  3. 3. Hypothesized Reaction Pathways Biotic Abiotic PCE PCE TCE Dichloroacetylene TCE Cis 1,2-DCE Trans 1,2-DCE 1,1-DCE, trans 1,2-DCE, cis1,2-DCE Chloroacetylene VC VC Ethene Ethene Acetylene Ethane Ethane C4 α-elimination Hydrogenolysis C4 compounds β-elimination Hydrogenation
  4. 4. Indicators of Degradation Pathway Abiotic Pathway Biotic Pathway • Dichloroacetylene • Chloroacetylene • Primarily cis 1,2-DCE • Acetylene • 1,1-DCE • Stoichiometric Conversion • Low TCE, DCE, VC / ethene ratio 5
  5. 5. Tetrachloroethene (PCE)
  6. 6. Trichloroethene (TCE)
  7. 7. Dichloroethene (DCE)
  8. 8. Radius of EHC Distribution Evaluation
  9. 9. pH Oxidation-Reduction Potential 8.0 250 W-AB-1 W-AB-1 200 W-AB-2 W-AB-2 7.5 150 W-AB-3 W-AB-3 100 Concentration (mV) Concentration (SU) 7.0 W-AB-4 W-AB-4 50 W-AB-5 W-AB-5 6.5 0 WU5-24 WU5-24 -50 6.0 EXW-1 EXW-1 -100 -150 5.5 -200 5.0 -250 -30 0 30 60 90 120 150 -30 0 30 60 90 120 150 Days (Day 0 = May 27, 2009) Days (Day 0 = May 27, 2009) Dissolved Oxygen Specific Conductance 0.9 8 W-AB-1 W-AB-1 0.8 W-AB-2 7 W-AB-2 0.7 W-AB-3 6 W-AB-3 Concentration (mg/L) W-AB-4 0.6 W-AB-4 5 SC (mS/cm) W-AB-5 0.5 W-AB-5 WU5-24 4 0.4 EXW-1 WU5-24 3 0.3 EXW-1 2 0.2 0.1 1 0.0 0 -30 0 30 60 90 120 150 -30 0 30 60 90 120 150 Days (Day 0 = May 27, 2009) Days (Day 0 = May 27, 2009)
  10. 10. Arsenic Manganese 40 60 W-AB-1 W-AB-1 35 W-AB-2 W-AB-2 50 30 W-AB-3 W-AB-3 Concentration (mg/L) Concentration (ug/L) W-AB-4 40 W-AB-4 25 W-AB-5 W-AB-5 20 30 WU5-24 WU5-24 15 EXW-1 EXW-1 20 10 10 5 0 0 -30 0 30 60 90 120 150 -30 0 30 60 90 120 150 Days (Day 0 = May 27, 2009) Days (Day 0 = May 27, 2009) Sulfate Methane 250 20,000 W-AB-1 W-AB-1 18,000 W-AB-2 W-AB-2 200 16,000 W-AB-3 W-AB-3 Concentration (mg/L) Concentration (ug/L) 14,000 W-AB-4 W-AB-4 150 12,000 W-AB-5 W-AB-5 10,000 WU5-24 WU5-24 100 8,000 EXW-1 EXW-1 6,000 50 4,000 2,000 0 0 -30 0 30 60 90 120 150 -30 0 30 60 90 120 150 Days (Day 0 = May 27, 2009) Days (Day 0 = May 27, 2009)
  11. 11. Ethenes & Ethane- Molar Concentration Average Inside Treatment Area (WA-B-2, WU5-24, EXW-1) 0.7 PCE 0.6 TCE Concentration (umol/L) 0.5 Total DCE 0.4 VC 0.3 Ethene 0.2 0.1 Ethane 0.0 Total Ethenes & -30 0 30 60 90 120 150 Ethane Days (Day 0 = May 27, 2009)
  12. 12. Ethenes & Ethane- Molar Concentration Average Outside of Treatment Area (WA-B-1, WA-B-3, WA-B-4, WA-B-5) 0.7 PCE 0.6 TCE Concentration (umol/L) 0.5 Total DCE 0.4 VC 0.3 Ethene 0.2 0.1 Ethane 0.0 Total Ethenes & -30 0 30 60 90 120 150 Ethane Days (Day 0 = May 27, 2009)
  13. 13. Ethenes & Ethane - Molar Concentration Average Downgradient of Treatment Area (WA-B-1, WA-B-3, WA-B-4, WA-B-5) 0.8 PCE 0.7 TCE Concentration (umol/L) 0.6 Total DCE 0.5 0.4 VC 0.3 Ethene 0.2 Ethane 0.1 0.0 Total Ethenes & -30 0 30 60 90 120 150 Ethane Days (Day 0 = May 27, 2009)
  14. 14. W-AB-3 (Upgradient, 7 to 17 ft bgs) Ethenes & Ethane - Molar Concentration 0.6 PCE 0.5 TCE Concentration (umol/L) 0.4 Total DCE 0.3 VC 0.2 Ethene 0.1 Ethane 0.0 Total -30 0 30 60 90 120 150 Ethenes & Ethane Days (Day 0 = May 27, 2009)
  15. 15. Relative Fraction of CEs, Ethene and Ethane EXW-1 Treatment Area Wells W-AB-2 WU5-24 Upgradient Well W-AB-3
  16. 16. Relative Fraction of CEs, Ethene and Ethane W-AB-1 Downgradient Wells W-AB-4 W-AB-5
  17. 17. Preliminary Conclusions Site 26 TS • pH, ORP, SC, T, in the treatment area are within the range considered appropriate for biotic and abiotic degradation of the CEs • DO, nitrate, arsenic, manganese, iron, sulfate and methane reducing conditions have been established in the treatment area. • Degradation of CEs is occurring. • Cis 1,2-DCE stall is not occurring. • Complete conversion of CEs to non-toxic degradation products is occurring. • Dechlorinating microbial culture (DHC) is present in the treatment area. 25
  18. 18. 26 Treatability Study Schedule January, 5, 2010 -2nd Quarter GW Sampling Event March 29, 2010 – 3rd Quarter GW Sampling Event June 28, 2010 – 4th Quarter GW Sampling Event August 25, 2010 -Draft Treatability Study Results Technical Memorandum October 27, 2010 -Final Treatability Study Results Technical Memorandum 26
  19. 19. Expanded Pilot Test (Site 28) Methodology Evaluate Three Technologies: In Situ Anaerobic Biotic/Abiotic Degradation (ISABA) EHC In Situ Anaerobic Biostimulation with Bioaugmentation (ISABB) Process Sodium Lactate & SDC-9 Emulsified Oil & SDC-9 Conduct Concurrent Pilot Tests in Three Areas: Building 88 Area Traffic Island Area Well W9-18 Area 27
  20. 20. Expanded Pilot Test Site 28 Well W9-19 ISABB - Emulsfied Oil & SDC-9 ISABA - EHC ISABB - Lactate & SDC-9 Task 1 3 2 ConductMonitoring Wells Install MIPs Investigation Inject Substrates
  21. 21. Site 28 Pilot Test Schedule February 2010 - Work Plans Finalized March 2010 - MIPs Investigation May 2010 -Treatability Study Progress Report June, 2010 – Monitoring Well Installation July, 2010 - Substrate Injection August 2010 to July 2011 - Performance Monitoring October 2011 – Treatability Study Final Report 29

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