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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 ...
Biologically Mediated Oxidation - Reduction
             Work                                                Growth
      ...
Biological Reductive Dechlorination of Chlorinated Ethenes
ORP
  0


  - 50

             H Cl
               H           ...
O H             Abiotic Pathway
                                                          H
                              ...
Some Hypothesized Reaction Pathways
             Biotic                                Abiotic

             PCE          ...
Indicators of Degradation Pathway

  Biotic Pathway                   Abiotic Pathway
                                    ...
EHC Injection Process




                        GW Flow
                        Direction
Groundwater Flow
Radius of EHC Distribution Evaluation
Groundwater Flow
Relative Molar Fraction of Ethenes and Ethane
Upgradient Well




Treatment Area Wells
Relative Molar Fraction of Ethenes and Ethane
Preliminary Conclusions Site 26 TS



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




June 28, 2010 – 4th Quarter GW Sampling Event




August 25, 2010 -Draft Treatability S...
Expanded Pilot Test (Site 28) Methodology


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




February 2010 - Work Plans Finalized

March 2010 - MIPs Investigation

May 2010 -Treatabil...
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
Moffett RAB Site 26 and 28 Update
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Moffett RAB Site 26 and 28 Update

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Presentation to the Moffett Field Restoration Advisory Board May 13, 2010: Update on Sites 26 and 28, Dan Leigh, Shaw Environmental and Infrastructure

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Transcript of "Moffett RAB Site 26 and 28 Update"

  1. 1. Installation Restoration Sites 26 and 28 Abiotic / Biotic Treatability Study Restoration Advisory Board Meeting May 13, 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. Biologically Mediated Oxidation - Reduction Work Growth Light bulb Protein Synthesis Motors Reproduction Resistor Electron Donor Reduced Electron Acceptor Oxidized Reduced Battery Oxidized Ground CnHn CO2 + H2O H2O + CO2 O2 Fe(II) Fe(III) HNO2 NO3 Fe(II) As(III) As(V) Fe(0) Mn(II) Mn(IV) FeS2 Fe(III)+SO4 Fe (II) Fe (III) H2S H2O +SO4 S- + H 2 O SO4 H2 H2O CH4 CO2
  4. 4. Biological Reductive Dechlorination of Chlorinated Ethenes ORP 0 - 50 H Cl H H H Cl H H Cl HH Cl H H Cl Cl HH - 150 C C C C C C H H Cl HH Cl H H Cl HH Cl H Cl H H H Cl - 200 PCE PCE PCE TCE TCE TCE - 250 cis 1,2 -DCE cis 1,2 -DCE cis 1,2 -DCE VC VC VC Ethene Ethene Ethene -300 Ethane Ethane Ethane
  5. 5. O H Abiotic Pathway H O H H H O H Fe0 Fe 0 Fe2+ H O H Fe0 Fe2+ Fe0 Fe 2+ Fe 0 Fe2+ H O H H O Fe2+ Cl Cl H C C Cl Cl O H H O H H Tetrachloroethene Dichloroacetylene Chloroacetylene Acetylene Ethene Ethane
  6. 6. Some 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 α-elimination Hydrogenolysis β-elimination Hydrogenation
  7. 7. Indicators of Degradation Pathway Biotic Pathway Abiotic Pathway • Dichloroacetylene • Chloroacetylene • Primarily cis 1,2-DCE • Acetylene • 1,1-DCE • Stoichiometric Conversion • Low TCE, DCE, VC / ethene ratio 10
  8. 8. EHC Injection Process GW Flow Direction
  9. 9. Groundwater Flow
  10. 10. Radius of EHC Distribution Evaluation
  11. 11. Groundwater Flow
  12. 12. Relative Molar Fraction of Ethenes and Ethane Upgradient Well Treatment Area Wells
  13. 13. Relative Molar Fraction of Ethenes and Ethane
  14. 14. 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. 26
  15. 15. 26 Treatability Study Schedule 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 27
  16. 16. 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 High Concentration Areas: Building 88 Area Traffic Island Area Well W9-18 Area 28
  17. 17. Expanded Pilot Test Site 28 ISABB - Emulsfied Oil & SDC-9 ISABA - EHC Task 1 Conduct MIPs Investigation Task 2 Install Monitoring ISABB - Lactate & SDC-9 Wells Task 3 Inject Substrates
  18. 18. 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 30
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