Moffett Superfund Site 26 Update to the Moffett Restoration Advisory Board
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Moffett Superfund Site 26 Update to the Moffett Restoration Advisory Board

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    Moffett Superfund Site 26 Update to the Moffett Restoration Advisory Board Moffett Superfund Site 26 Update to the Moffett Restoration Advisory Board Presentation Transcript

    • Former NAS Moffett FieldSite 26 Eastside Aquifer Treatment System Neil Hey, PG Shaw Environmental, Inc. Valerie Harris, PE Harris Navy BRAC PMO West September 8, 2011 S t b 8 RAB Meeting 1
    • Presentation Overview• Treatability Study Update• Focused Feasibility Study• Schedule• Questions 2
    • Site 26 Treatability Study - Location Note – inset location not to scale 3
    • Treatability Study PurposeEvaluate the applicability and effectiveness ofEHC®, an in situ abiotic/biotic treatmenttechnology,technology to reduce the chemicals of concern(COC; PCE, TCE, DCE, & VC) concentrations inggroundwater to levels below the ROD cleanup pstandards at IR Site 26 4
    • EHC® Treatment Technology• A product of Adventus Americas, Inc.• Patented combination of zero-valent iron (ZVI) zero valent particles & plant-based carbon• Combination of chemical (abiotic) and biological (biotic) reductive dechlorination processes 5
    • Project Description• Installed 5 observation wells• Injected EHC® at 16 locations• Performed 10 post-injection groundwater monitoring events g 6
    • EHC® Injection Site LocationTotal CEs ~80µg/L50 ft x 50 ft area40 to 8 feet bgs~6,600 gallons 6,600hydrant water~23,000~23 000 poundsEHC® Groundwater Flow 7
    • Treatment Area Results82 µg/L total 4 µg/L total 2 µg/L total 8
    • Treatment Area Results 9
    • TS Conclusions• EHC® easy to prepare but difficult to inject• EHC® not di t ib t d uniformly due to h t t distributed if l d t heterogeneous nature of subsurface• Complete reductive dechlorination observed in all treatment area wells• 98% reduction in total COCs concentration in treatment area• PCE, TCE, & DCE concentrations in treatment area reduced below ROD cleanup standards in < 1 year• Vinyl hl id Vi l chloride concentration in treatment area remains i i i slightly above ROD cleanup standard but decreasing• EHC® continues to treat on-flow of COCs 2 years after y treatment 10
    • Focused Feasibility Study 11
    • Site 26 Background• Chlorinated solvents identified in groundwater near Hangar 3 in 1983• Record of decision (ROD) signed in 1996. Selected remedy was groundwater extraction and treatment to restore groundwater to cleanup standards.• Cleanup standards – drinking water – Tetrachloroethene (PCE) = 5 g/L – Trichloroethene (TCE) = 5 g/L –CCis-1,2-dichloroethene = 6 g/L 2 d hl h / – Vinyl chloride = 0.5 g/L 12
    • Site 26 Background (continued)• Eastside Aquifer Treatment System (EATS) began q y ( ) g operating in 1999. – extracted 67 million gallons of water – removed 23.7 pounds of chlorinated volatile organic compounds (VOCs)• Shut down in 2003 to evaluate: – Evaluate plume stability – Chemical rebound – Natural attenuation – HRC in plume hot spots – Treatability study (almost completed) 13
    • 2010 Groundwater Plume Combined CVOC concentrations • 85.9 g/L (maximum) located near current treatability study • Max combined CVOC concentration in other areas about 25 g/L b t / TREATABILITY STUDY AREAGroundwater Flow 14
    • Focused Feasibility StudyPurpose – to evaluate several technologies along with the selected remedy• Identify remedial action objectives and applicable regulations• Identify and screen treatment technologies – Monitored Natural Attenuation – Abiotic/Biotic Treatment (EHC®) – In Situ Biostimulation/Bioaugmentation• Develop and evaluate remedial alternatives against seven of the nine NCP criteria• Compare the remedial alternatives against each other 15
    • Preliminary Remedial Alternatives• Alternative 1 – No Action• Alternative 2 – Monitored Natural Attenuation (MNA)• Alternative 3 – Optimized Pump and Treat 16
    • Preliminary Remedial Alternatives• Alternative 4 – Abiotic/biotic Treatment and MNA• Alternative 5 – In Situ Biostimulation /Bioaugmentation and MNA /Bi t ti d Biotic PCE TCE Cis 1,2‐DCE       Trans 1,2‐DCE VC Ethene Ethane α‐elimination 17 β‐elimination
    • Conceptual Treatment Areas •Trend analysis performed for each well •Identify areas th t could b that ld benefit fit from treatmentNaturalprocesses =60 years Natural processes > 60 years (increasing trend/no trend) 18
    • Sustainability• An evaluation of sustainability will be included in the feasibility study (FS)• FS will use SiteWiseTM – Streamlined life cycle analysis tool life-cycle – Developed by Navy, Army Corps and Battelle – Available at http://www.ert2.org/t2gsrportal• Sustainability metrics considered are: – Energy and resource consumption gy p – Greenhouse gas and criteria pollutant emissions – Water and ecological impacts – Worker and community safety 19
    • Schedule• November 30, 2011- Draft FS Report p• December 1, 2011 to January 29, 2011 – Agency/RAB Review of draft g y/• April 30, 2012 - Final FS ReportNext Steps – Proposed plan – ROD amendment 20
    • Questions? 21