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Site 28 In Situ Abiotic/Biotic Treatability Study Implementation

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Presentation to the Moffett Restoration Advisory Board November 18, 2010: Site 28 In Situ Abiotic/Biotic Treatability Study Implementation

Presentation to the Moffett Restoration Advisory Board November 18, 2010: Site 28 In Situ Abiotic/Biotic Treatability Study Implementation

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Site 28 In Situ Abiotic/Biotic Treatability Study Implementation Site 28 In Situ Abiotic/Biotic Treatability Study Implementation Presentation Transcript

  • Installation Restoration Site 28 In Situ Abiotic / Biotic Treatability Study Implementation I l t ti RAB Meeting November 18, 2010 18 Former Naval Air Station Moffett Field, Moffett Field, California
  • Site 28 Area 2
  • IR Site 28 Treatability Study Purpose of Treatability Study (TS) Determine if in situ anaerobic biotic or combined abiotic/biotic treatment technologies are viable for remediating the remaining chlorinated ethenes ( g (CEs) p ) present in the upper and pp lower portions of the A-aquifer at IR Site 28. Treatability Study Method Conduct separate pilot tests in areas of highest CE concentrations at three areas of interest (Former Building 88, Traffic Island, and Well W9-18). Stage 1: Hot Spot Characterization Stage 2: Treatment Pilot Tests
  • Stage 1: Hot Spot Characterization Hot Spot Delineation Further define lateral and vertical distribution of high concentration chlorinated ethenes (CEs) in the three areas of interest. Dense Non-Aqueous Phase Liquid (DNAPL) Investigation Evaluate whether PCE DNAPLs are present in the Former Building 88 Area and Traffic Island Area
  • Stage 2: Treatment Pilot Tests Evaluate Two Processes/Three Treatment Technologies Separately: In Situ Anaerobic Biostimulation with Bioaugmentation Process Sodium Lactate (Wilclear®) & Dechlorinating Microbial Consortium (SDC 9 ) (SDC-9™) Emulsified Vegetable Oil (LactOil™) & SDC-9™ In Situ Anaerobic Biotic/Abiotic Degradation Process Zero-valent iron with controlled-release carbon (EHC®) Concurrent Pilot Tests in Three High Concentration Areas: Traffic Island Area (LactOil™ & SDC-9™) Building 88 Area (Wilclear® & SDC-9™) Well W9-18 Area (EHC®)
  • Site 28 Pilot Test Area 6
  • ISABB - Emulsified Oil & SDC-9™ ISABA - EHC® ISABB - Lactate & SDC-9™
  • IR Site 28 Treatability Study Implementation Stage 1: Hot Spot Characterization March and April 2010 p Hot Spot Delineation DNAPL Investigation
  • Hot Spot Delineation Goal: Further define lateral and vertical distribution of high concentration chlorinated ethenes (CEs) • Membrane Interface Probe (MIP) Testing o Total depth of 65 feet below ground surface o 19 locations in Traffic Island Area o 12 locations in Former Building 88 Area o 4 locations in Well W9-18 Area
  • MIP Test Locations
  • Membrane Interface Probe (MIP) 11
  • MIP Installation 12
  • MIP Installation 13
  • Typical MIP Log ECD PID FID 14
  • DNAPL Investigation Goal: Evaluate for the potential presence of PCE DNAPLs in the Former Building 88 Area and Traffic Island Area • Continuous Soil Cores o Adjacent to MIP test with greatest detector responses o Visual observation and PID scanning o Select OilScreenSoil (Sudan IV)® Screening Tests • Hydrophobic Fl ibl Membrane Testing H d h bi Flexible M b T ti o NAPL FLUTeTM Liner o Adjacent to continuous soil cores • 1 location in Former Bldg 88 Area; 2 locations in Traffic Island Area • Maximum depth of 65 feet below ground surface • No evidence of DNAPLs encountered
  • Soil Core & NAPL FLUTe™ Test Locations
  • OilScreenSoil (Sudan IV)® Test 17
  • NAPL FLUTe™ Liner 18
  • NAPL FLUTe™ Liner Deployment 19
  • NAPL FLUTe™ Liner Dilation 20
  • NAPL FLUTe™ Liner Removal 21
  • NAPL FLUTe™ - Protective Liner Removal 22
  • NAPL FLUTe™ Liner Inspection – No Staining 23
  • Emulsified Oil & SDC-9™ SDC 9 EHC® Lactate & SDC-9™ Observation Well Network &  Observation Well Network & Injection Grid Layout
  • Former Building 88 Area Cross-Section GW flow direction
  • Well W9-18 Area Cross-Section GW flow direction
  • Traffic Island Area Cross-Section GW flow direction
  • IR Site 28 Treatability Study Implementation Stage 2: Treatment Pilot Tests July and August 2010 y g  Observation Well Network Installation  Baseline Groundwater Monitoring Event  Substrate Preparation  Substrate Injection  Post-Injection Performance Monitoring
  • Observation Well Network Installation – June 2010 29
  • Well Installation – Traffic Island 30
  • Baseline Groundwater Monitoring Event - July 2010 31
  • Monitoring Parameters • VOCs VOC PCE, TCE, DCE, VC, Ethene, Ethane, Acetylene • Biogeochemical Indicators Bi h i l I di t DO, Nitrate, Arsenic, Manganese, Iron, Sulfate, Methane • Organic Substrate Indicators TOC, Alkalinity, and Volatile Fatty Acids • Physical pH, ORP, Specific Conductance, Turbidity, Temperature • Biological Dehalococcoides sp
  • Bldg 88 Area - Total Chlorinated Ethenes, µg/L GW flow direction 27,279 27 279 3,002 3 002 3,049 3 049 4,306 3,764 4,521
  • Traffic Island Area - Total Chlorinated Ethenes, µg/L GW flow direction 1,759 4,109 872 476 469 751 311 3,614 18,245 36,125 4,623 32,950 34
  • Well W9-18 Area - Total Chlorinated Ethenes, µg/L GW flow direction 3,158 6,375 3,049 2,727 7,816 2,381 35
  • Substrate Mixing Tank – Former Bldg 88 Area 36
  • Substrate Preparation 37
  • Substrate Mixing Tank – Traffic Island Area 38
  • Bioaugmentation Addition of dechlorinating microbial consortium to batch i bi l ti t b t h mixing tank Shaws Patented SDC 9 SDC-9™ Contains Dehalococcoides sp Naturally occurring microbes (not engineered) Injected at hundreds of sites Native to California Injected at Former Building 88 Area and Traffic Island Area 39
  • Batch Tank – Traffic Island Area
  • Substrate Injection
  • Substrate Injection – Traffic Island 42
  • Substrate Injection Rigs 43
  • Substrate Injection – Traffic Island 44
  • Substrate Injection Tool
  • Pressure Activated Injection
  • Wilclear® & SDC-9™ Injection – Former Bldg 88 Area • Original estimated sodium lactate demand for treatment area ~1,060 lbs (incl. 4 times safety factor) t t t 1 060 lb (i l ti f t f t ) • Due to anticipated high pH replaced 184 lbs of lactate with 55 lbs of lactic acid i h lb f l i id • 876 lbs of lactate with 55 lbs of lactic acid injected • ~8,000 gallons of pre-treated GW from WATS injected • 34 L of SDC-9 injected to generate a target concentration of 1x107 cells DHC/liter • 10 points, 35 to 60 ft bgs
  • Injection Layout – Former Bldg 88 Area
  • LactOil™ & SDC-9™ Injection – Traffic Island Area • Target concentration of 8,000 mg/L emulsified 8 000 vegetable oil in GW • 3,190 3 190 gallons of LactOil™ injected LactOil • ~28,000 gallons of pre-treated GW from WATS injected • 119 L of SDC-9™ injected to generate a target concentration of 1x107 cells DHC/liter • 15 points, 10 to 65 ft bgs
  • Injection Layout – Traffic Island Area 10 to 55 ft bgs interval g
  • Injection Layout – Traffic Island Area 55 to 65 ft bgs interval g
  • EHC® Injection – Well W9-18 Area • Original target ~0.3% of EHC® by soil mass 0.3% (~4,000 lbs EHC®) • Doubled the dose to ~8,000 lbs EHC® based on 8,000 IR Site 26 results • ~8,000 ~8 000 lbs of EHC® injected • ~2,500 gallons of hydrant water injected • No bioaugmentation with SDC-9™ • 4 points 10 to 30 ft bgs points,
  • Injection Layout – Well W9-18 Area
  • Post-Injection g Performance Groundwater Monitoring • 5 post–injection events: p j  August 2010  early November 2010  late January 2010  mid April 2011  late June 2011 •All 24 observation wells + 3 monitoring wells •Same analytical parameters as baseline event  VOCs, Biogeochemical Indicators, Organic Substrate Indicators, Physical, and Biological
  • Traffic Island - Emulsified Oil pH in Treatability Study Areas pH 11.0 Treatability Study Wells 10.5 10.0 Traffic Island Bldg 88 W9-18 dard Units for pH H 9.5 28OW-13 28OW-01 28OW-02 9.0 8.5 28OW-03 28OW-04 28OW-14 8.0 7.5 28OW-05 28OW-06 28OW-15 Stand 7.0 28OW-07 28OW-08 28OW-16 6.5 6.0 28OW-09 28OW-10 28OW-17 5.5 5.0 28OW-11 28OW-12 28OW-18 0 20 40 60 80 100 W9-29 W9-42 Days (Day 0 = August 16, 2010) W9-18 Building 88 - Lactate W9-18 Area - EHC® pH p pH 8.0 80 12 7.5 11 Standard Units for pH Standard Units fo pH 10 7.0 or s 9 6.5 8 6.0 7 S 5.5 55 6 5.0 5 0 20 40 60 80 100 120 0 20 40 60 80 100 Days (Day 0 = August 2, 2010) Days (Day 0 = August 24, 2010)
  • Traffic Island - Emulsified Oil ORP in Treatability Study Areas Oxidation-Reduction Potential 300 Treatability Study Wells 200 Traffic Island Bldg 88 W9-18 100 28OW-01 28OW-02 28OW-13 milliVolts 0 28OW-03 28OW-04 28OW-14 -100 28OW-05 28OW-06 28OW-15 -200 28OW-07 28OW-08 28OW-16 -300 28OW-09 28OW-10 28OW-17 -400 28OW-11 28OW-12 28OW-18 0 20 40 60 80 100 Days (Day 0 = August 16, 2010) W9-29 W9-42 W9-18 Building 88 - Lactate W9-18 Area - EHC® Oxidation-Reduction Potential Oxidation-Reduction Potential 300 300 200 200 100 100 olts olts milliVo milliVo 0 0 -100 -100 -200 -200 -300 -300 -400 -400 0 20 40 60 80 100 120 56 0 20 40 60 80 100 Days (Day 0 = August 2, 2010) Days (Day 0 = August 24, 2010)
  • Traffic Island - Emulsified Oil DO in Treatability Study Areas Dissolved Oxygen 2.5 Treatability Study Wells Traffic Island Bldg 88 W9-18 g/L) 2.0 oncentration (mg 28OW-01 28OW-02 28OW-13 1.5 28OW-03 28OW-04 28OW-14 28OW-05 28OW-06 28OW-15 1.0 Co 28OW-07 28OW-08 28OW-16 0.5 28OW-09 28OW-10 28OW-17 0.0 28OW-11 28OW-12 28OW-18 0 20 40 60 80 100 Days (Day 0 = August 16, 2010) W9-29 W9-42 W9-18 Building 88 ‐ Lactate W9-18 Area - EHC® Dissolved Oxygen Dissolved Oxygen 1.8 18 3.5 1.6 3.0 1.4 Concentration  (mg/L) 1.2 Concentration (mg/L) ( 2.5 1.0 2.0 0.8 1.5 0.6 1.0 0.4 0.5 0.2 0.0 0.0 0 20 40 60 80 100 120 57 0 20 40 60 80 100 Days (Day 0 = August 2, 2010) Days (Day 0 = August 24, 2010)
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