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Moffett RAB Site 26 and 28 Update
 

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

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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    Moffett RAB Site 26 and 28 Update Moffett RAB Site 26 and 28 Update Presentation Transcript

    • Installation Restoration Sites 26 and 28 Abiotic / Biotic Treatability Study Restoration Advisory Board Meeting May 13, 2010
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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 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
    • 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
    • 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
    • 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
    • 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