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Moffett RAB Site 28 Update
 

Moffett RAB Site 28 Update

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Presentation to the Moffett Restoration Advisory Board May 12, 2011.

Presentation to the Moffett Restoration Advisory Board May 12, 2011.

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    Moffett RAB Site 28 Update Moffett RAB Site 28 Update Presentation Transcript

    • Installation Restoration Site 28In Situ Biotic/Abiotic Treatability Study Valerie Harris, U.S. Navy Dan Leigh, Shaw E&I, Inc. Restoration Advisory Board Meeting May 12, 2011 12Former Naval Air Station Moffett Field, Moffett Field, California
    • Site Location 2
    • Pilot Test Areas and Regional Plume Traffic Island Well W9-18 Fmr Bld 88 3
    • Hypothesized Reaction Pathways Biotic Abiotic PCE PCE TCE Dichloroacetylene TCECis 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
    • Indicators of Degradation Pathway Abiotic Pathway y Biotic Pathway Biotic Pathway • Dichloroacetylene • Primarily cis 1,2‐DCE • Chloroacetylene• Stoichiometric Conversion • Acetylene • 1,1‐DCE , • Low TCE, DCE, VC / ethene ratio 6
    • IR Site 28 Treatability StudyPurpose of Treatability Study (TS)Determine if in situ anaerobic biotic or combinedabiotic/biotic treatment can remediate the chlorinatedethenes (CEs) at IR Site 28Treatability Study MethodConduct separate pilot tests in three areas Former Building 88 Area Traffic Island Area Well W9-18 AreaStage 1: Hot Spot CharacterizationStage 2: Treatment Pilot Tests
    • IR Site 28 TS ImplementationField Activities (July and August 2010 )  Observation Well Network Installation  Baseline Groundwater Monitoring Event  Substrate Preparation  Substrate Injection  Post-Injection P f P t I j ti Performance M it i Monitoring
    • Pilot Tests in Three AreasIn Situ Anaerobic Biostimulation with BioaugmentationProcess Traffic Island Area Emulsified Vegetable Oil [LactOil™] & SDC-9™ Building 88 Area Sodium Lactate [Wilclear®] & D hl i i Mi bi l S di L [Wil l Dechlorinating Microbial Consortium [SDC-9™]In Situ Anaerobic Biotic/Abiotic Degradation Process Well W9-18 Area Zero-valent i Z l t iron with controlled-release carbon [EHC®] ith t ll d l b
    • Emulsified Oil & SDC 9 SDC-9™EHC® Lactate & SDC-9™ Observation Well Network &  Observation Well Network & Injection Grid Layout
    • Injection Layout – Traffic Island Area 10 to 55 ft bgs interval15 injection points j p20 injection intervals(65 to 10 feet bgs)28,000 gallons of WATSwater3,190 gallons Lactoil115 liters SDC 9 SDC-9
    • Injection Layout – Traffic Island Area 55 to 65 ft bgs interval
    • Injection Layout – Former Bldg 88 Area10 injection points10 injection intervals(60 to 35 feet bgs)865 lbs lactate8,000 gallons of WATSwater55 lbs lactic acid35 liters SDC-9
    • Injection Layout – Well W9-18 Area 4 injection points 8 injection intervals (30 to 10 Feet bgs) 8,000 lbs EHC 2,500 gallons hydrant water
    • Implementation ObservationsSubstrate I jS b Injection: i •EHC difficult to inject and distribute in low permeability j p y units. •Lactate and EVO easier to inject and distribute distribute. •Substrates not distributed uniformly due to heterogeneous nature of subsurface. t f b f
    • Pre and Post-Injection Monitoring• 6 events:  Baseline sampling - completed  August 2010 - completed  early November 2010 - completed  late January 2011 - completed  mid April 2011 – waiting for analytical results  late June 2011•All 24 observation wells + 3 monitoring wells b ti ll it i ll•Analytical parameters  VOCs, Biogeochemical Indicators, Organic Substrate Indicators, Physical, and Biological
    • Geochemical Indicator Parameter SummaryTreatment AT Area Results R l• pH and ORP are within appropriate range. range• Alkalinity and TOC increased indicating substrate was distributed. distributed• Changes in electron acceptor (EA) and expressed product (EP) concentrations indicate conditions are appropriate. 17
    • Results for Traffic Island Area 18
    • Traffic Island Area - Total Chlorinated Ethenes, µg/L GW flow direction1,759 4,109 872476 469 751311 3,614 18,245 36,125 4,623 32,950 19
    • VOCs & Dissolved Gasses Traffic Island Graph 20a 28OW-05 (Treatment Area; 12 to 17 ft bgs) Mass Concentration 5,000 800 PCE TCE Total T t l DCE Ethene, Ethane, Acetylene (µg/L) 4,500 700PCE, TCE, DCE, VC (µg/L) 4,000 600 3,500 3,000 500 A , 2,500 400 VC Ethene Ethane 2,000 300 1,500 200 1,000 500 100 0 0 Acetylene 0 50 100 150 200 0 0 0 1 1 1 Days (Day 0 = August 16, 2010) Graph 21a Graph 22a p 28OW-06 (Treatment Area; 24 to 29 ft bgs) 28OW-07 (Treatment Area; 40 to 50 ft bgs) Mass Concentration Mass Concentration 1,800 350 lene (µg/L) 8,000 100 Ethen Ethane, Acetylene (µg/L) 1,600 7,000 90 300 µg/L) µg/L) 1,400 80 250 6,000PCE TCE, DCE, VC (µ PCE TCE, DCE, VC (µ Ethen Ethane, Acetyl 1,200 70 5,000 60 1,000 200 4,000 50 800 150 3,000 40 600 100 30 ne, ne, 2,000 2 000 E, E, 400 20 50 1,000 200 10 0 0 0 0 0 50 100 150 200 20 0 50 100 150 200 Days (Day 0 = August 16, 2010) Days (Day 0 = August 16, 2010)
    • Graph 23a 28OW-08 (Treatment Area; 55 to 65 ft bgs) VOCs & Dissolved Gasses Traffic Mass Concentration 5,000 800 µg/L) 4,500 700 Island ane, Acetylene (µPCE, TCE, DCE, VC (µg/L) 4,000 600 3,500 3,000 500 2,500 400 PCE Ethene, Etha 2,000 2 000 300 1,500 200 1,000 500 100 TCE 0 0 0 50 100 150 200 Days (Day 0 = August 16, 2010) Total DCE Graph 27a 28OW-12 (Treatment Area; 55 to 65 ft bgs) Mass Concentration 50,000 5000 VC tylene (µg/L) 45,000 4500PC TCE, DCE, VC (µg/L) 40,000 4000 35,000 3500 Ethene C Ethen Ethane, Acet 30,000 3000 25,000 2500 20,000 2000 15,000 1500 Ethane ne, CE, 10,000 10 000 1000 5,000 500 0 0 Acetylene 0 50 100 150 200 21 Days (Day 0 = August 16, 2010) 0 1 1
    • VOCs & Dissolved Gasses Traffic Island PCE Graph 16a Graph 18a 28OW-01 (Downgradient; 12 to 17 ft bgs) 28OW-03 (Downgradient; 40 to 50 ft bgs) Mass Concentration Mass Concentration 700 25 TCE 35,000 300 Ethene, Ethane, Acetylene (µg/L) Ethene, Ethane, Acetylene (µg/L) 600 30,000 250PCE, TCE, DCE VC (µg/L) 20 PCE, TCE, DCE, VC (µg/L) Total DCE 500 25,000 200 15 400 VC 20,000 E, 150 300 10 15,000 Ethene 100 200 10,000 5 100 5,000 50 Ethane 0 0 0 0 0 50 100 150 200 0 50 100 150 200 Days (Day 0 = August 16, 2010) Acetylene Days (Day 0 = August 16, 2010) Graph 17a Graph 19a 28OW-02 (Downgradient; 24 to 29 ft bgs) 28OW 04 28OW-04 (Downgradient; 55 to 65 ft bgs) Mass Concentration Mass Concentration 1,800 250 30,000 140 tylene (µg/L) Ethen Ethane, Acetyle (µg/L) 1,600 25,000 120 PC TCE, DCE, VC (µg/L) PC TCE, DCE, VC (µg/L) 1,400 200 ene 100 1,200 1 200 20,000 20 000 hene, Ethane, Acet C 150 1,000 80 15,000 800 60 100 600 10,000 40 CE, CE, 400 ne, 50 5,000 5 000 Eth 20 200 0 0 0 0 0 50 100 150 200 0 50 100 150 200 Days (Day 0 = August 16, 2010) 22 Days (Day 0 = August 16, 2010)
    • Treatmen Area nt 28O OW-12 28OW W-08 28OW-0 07 28OW-06 28OW-05 Screened 55 to 65 ft bgs d Screened 55 to 65 ft bgs t Screened 40 to 50 ft bgs 0 Screened 24 to 29 ft bgs b Screened 12 to 17 ft bgs y Day 0 Week 1 Week 12 Week 24 VC23 TCE PCE t-DCE c-DCE Ethane Ethene 1,1-DCE Acetylene Downgra adient 28OW-04 28OW-03 28OW-02 2 28OW-01 Screened 55 to 65 ft bgs S Screened 40 to 50 ft bgs Screened 24 to 29 ft bgs Screen 12 to 17 ft bgs ned Day 0 Week 1 Molar Fraction of Ethenes in Traffic IslandArea Week 12 Week 24
    • Cross gra adient W9-42 W9-29 Screened 29 to 39 ft bgs Screened 7 to 17 ft bgs VC24 TCE PCE t-DCE c-DCE Ethane Ethene 1,1-DCE Acetylene Upgrad dient 28O OW-11 28OW W-10 28OW-0 09 Screened 40 to 50 ft bgs Screened 24 to 29 ft bgs Screened 12 to 17 ft bgs Molar Fraction of Ethenes in Traffic IslandArea
    • Building 88 Area• Pretty picture please 25
    • Bldg 88 Area - Total Chlorinated Ethenes, µg/LGW flow direction 27,279 27 279 3,002 3 002 3,049 3 049 4,306 3,764 4,521
    • VOCs & Dissolved Gasses Building 88 Area Graph 64a PCE Graph 62a 28OW-21 (Treatment Area; 35 to 40 ft bgs) 28OW-19 (Downgradient; 35 to 40 ft bgs) Mass Concentration Mass Concentration 4,500 700 TCE 4,000 0.8 Ethene, Ethane, Acetylene (µg/L) cetylene (µg/L) 4,000 3,500 0.7 600PCE, TCE, DCE, VC (µg/L) PCE, TCE, DCE VC (µg/L) 3,500 Total DCE 500 3,000 0.6 3,000 2,500 0.5 2,500 400 VC E, Ethene, Ethane, Ac A 2,000 0.4 2,000 300 1,500 1,500 0.3 200 Ethene 1,000 1,000 0.2 100 500 500 0.1 Ethane 0 0 0 0 0 50 100 150 200 0 50 100 150 200 Days (Day 0 = August 2, 2010) Acetylene Days (Day 0 = August 2, 2010) Graph 65a Graph 63a 28OW-22 (Treatment Area; 52 to 62 ft bgs) 28OW-20 (Downgradient; 52 to 62 ft bgs) Mass Concentration M C t ti Mass Concentration 4,500 1.2 5,000 3.5 etylene (µg/L) ylene (µg/L) 4,000 4,500 1 3 Concentration (µg/L) PCE, TCE, DCE, VC (µg/L) 3,500 4,000 3,500 2.5 3,000 0.8 hene, Ethane, Ace C ene, Ethane, Acety 3,000 2 2,500 0.6 2,500 2,000 1.5 2,000 1,500 0.4 1,500 1 1,000 0.2 1,000 Eth 0.5 05 Ethe 500 500 0 0 0 0 0 20 40 60 80 100 120 0 50 100 150 200 Days (Day 0 = August 2, 2010) 27 Days (Day 0 = August 2, 2010)
    • Dow wngradien nt Treatm ment Area 28OW W-20 28O OW-19 Screened 52 to 62 ft bgs o Screened 3 5 to 40 ft bgs 28OW-22 28OW-21 Screened 52 to 62 ft bgs Screened 35 to 40 ft bgs Day 0 Week 1 Week 14 Week 2628 Up pgradient 28OW-24 28OW-23 Screened 52 to 62 ft bgs 6 Screened 35 to 40 ft bgs 4 TCE PCE t-DCE c-DCE DCE 1,1-DCE , VC Molar Fraction of Ethenes in Former Bldg 88 Area Ethane Ethene Acetylene
    • Well W9‐18 Area 29
    • Well W9-18 Area - Total Chlorinated Ethenes, µg/L GW flow direction 3,158 6,375 3,049 2,727 7,816 2,381 30
    • VOCs & Dissolved Gasses W9-18 Area Graph 102a 28OW-15 (Treatment Area; 13 to 18 ft bgs) Mass Concentration 9,000 3.5 PCE TCE Total DCE cetylene (µg/L) 8,000 3PCE, TCE, DCE, VC (µg/L) 7,000 2.5 6,000 V Ethene, Ethane, Ac 5,000 2 4,000 VC Ethene Ethane 1.5 3,000 1 2,000 0.5 1,000 E 0 0 Acetylene 0 50 100 150 200 0 0 0 1 1 1 Days (Day 0 = August 24, 2010) Graph 103a Graph 106a 28OW-16 (Treatment Area; 22 to 32 ft bgs) W9-18 (Treatment Area; 14 to 24 ft bgs) Mass Concentration Mass Concentration 3,500 7 8,000 180 Ethene Ethane, Acetyle (µg/L) Ethene Ethane, Acetyle (µg/L) 7,000 160 3,000 6PCE, TCE, DCE, VC (µg/L) PCE, TCE, DCE, VC (µg/L) ene ene 6,000 , 140 2,500 2 500 5 120 5,000 2,000 4 100 4,000 1,500 3 80 3,000 60 1,000 2 e, e, 2,000 2 000 , 40 500 1 1,000 20 0 0 0 0 0 50 100 150 200 31 0 50 100 150 200 Days (Day 0 = August 24, 2010) Days (Day 0 = August 24, 2010)
    • VOCs & Dissolved Gasses W9-18 Area Graph 100a 28OW-13 (Downgradient; 13 to 18 ft bgs) Mass Concentration 3,500 600 PCE TCE Total DCE tylene (µg/L) 3,000 500PCE, TCE, DCE, VC (µg/L) 2,500 400 C ene, Ethane, Acet 2,000 300 VC Ethene Ethane 1,500 200 1,000 500 100 EtheP 0 0 Acetylene 0 50 100 150 200 0 0 0 1 1 1 Days (Day 0 = August 24, 2010) Graph 101a 28OW-14 (Downgradient; 22 to 32 ft bgs) Mass Concentration 8,000 25 Ethene, Ethane, Acetylene (µg/L) 7,000PCE, TCE, DCE, VC (µg/L) 20 6,000 5,000 15 4,000 3,000 10 2,000 5 1,000 0 0 0 50 100 150 200 32 Days (Day 0 = August 24, 2010)
    • Down ngradient Treatmen Area nt 28OW-14 4 28OW-13 W9-1 18 28OW-16 28OW-15 Screened 22 to 32 ft bgs f Screened 13 to 18 ft bg gs Screened 14 to 24 ft bgs o Screened 22 to 32 ft bgs Screened 13 to 18 ft bgs b Day 0 Week 1 Week 11 Week 2233 Upgradient 28OW-18 28OW-17 7 Screened 52 to 62 ft bgs 2 Screened 35 to 40 ft bgs Well W9-18 Area TCE PCE t-DCE c-DCE DCE 1,1-DCE , VC Ethane Ethene Acetylene
    • Analytical Results Summary• Some intrinsic abiotic degradation was occurring prior to substrate injection• DHC (“bugs”) present in some areas prior to (“b ”) i i bioaugmentation• Complete dechlorination to ethene observed in some wells• Degradation not observed in some treatment area wells• Hydrogeology substantially affects substrate distribution and therefore degradation 34
    • Analytical Results Summary (cont.)• Lactate rapidly enhances degradation but is not degradation, persistent• Emulsified oils with lactate rapidly enhances degradation and lasts longer• EHC is effective at the high concentration that was injected• Injecting substrate and bioaugmentation culture simultaneously is effective 35
    • Questions? 36