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Status of Sandia’s Environmental Restoration Project

Status of Sandia’s Environmental Restoration Project. John R. Cochran Environmental Restoration Project Manager Sandia National Laboratories April 21, 2010. Joe Estrada Environmental Restoration Federal Project Director DOE/NNSA Sandia Site Office.

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Status of Sandia’s Environmental Restoration Project

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  1. Status of Sandia’s Environmental Restoration Project John R. Cochran Environmental Restoration Project Manager Sandia National Laboratories April 21, 2010 Joe Estrada Environmental Restoration Federal Project Director DOE/NNSA Sandia Site Office SAND2010-2562C Sandia National Laboratories is a multi-program laboratory operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin company, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000". 1

  2. Overview of Sandia’s Environmental Restoration (ER) Project • Mission – Identify, Characterize and Remediate sites where hazardous & radioactive materials have been released • Managing: • 265 Environmental Restoration sites (ER sites) • 3 Groundwater Areas of Concern (GW AOCs) • Regulated by New Mexico Environment Department (NMED) 2

  3. Overview of Sandia’s ER Project • Very successful, completely closed 232 of 265 ER sites • Status of remaining 33 ER sites & 3 GW AOCs 3

  4. Order of Presentation • 33 remaining ER sites • Chemical Waste Landfill (RCRA regulated unit) • Mixed Waste Landfill (RCRA solid waste management unit (SWMU)) • 31 SWMUs in “Corrective Action Complete” regulatory process • Three GW AOCs (regulated as SWMUs) • Burn Site GW AOC • Tijeras Arroyo GW AOC • Technical Area V GW AOC 4

  5. Chemical Waste Landfill - Background • 1.9 acre interim-status landfill operational from 1962 to 1985 • 2 Voluntary Corrective Measures completed • Vapor Extraction 1997-1998 • Landfill Excavation 1998-2003 • Corrective Measures Study recommended Evapotranspirative (ET) cover as final remedy (2004) • NMED accepted ET cover as interim measure (2005) • ET Cover installed (2005) • ET cover accepted as final remedy (2009) 5

  6. Chemical Waste Landfill with ET Cover– September 2005

  7. Chemical Waste Landfill – Current Status • NMED approved: (October 2009) • CMS Report/Final Remedy • Closure Plan Amendment • Post-Closure Care Permit • Currently installing 4 GW monitoring wells 7

  8. Mixed Waste Landfill - Background • 2.6 acre landfill • Operational 1959 to 1988 • Received: • ~ 3,700 yd3 low-level radioactive & mixed waste • ~ 6,700 curies in 1989 • GW monitoring since 1990 8

  9. Mixed Waste Landfill - Background • Natural evapotranspirative (ET) cover recommended as remedy (2003) • Public comment on remedy (2004) • Public Hearing on remedy (2004) • NMED issued Final Order (2005): • Selecting ET cover w/ bio-intrusion barrier as remedy • requiring Corrective Measures Implementation Plan (CMIP) • and setting other requirements 9

  10. Mixed Waste Landfill - Status • CMIP submitted to NMED (2005) • CMIP approved by NMED (2008) • Cover constructed (2009) • Report documenting construction to NMED (January 2010) 10

  11. Mixed Waste Landfill Cover 2009 11

  12. 31 SWMUs in Corrective Action Complete Regulatory Process - Background • Include former: septic systems & drain fields, surface testing and burn sites • Step-wise characterization (soil / soil vapor / GW) • Excavation & removal of contaminated soils • Characterization & remediation completed 2007 12

  13. 31 SWMUs/AOCs in Corrective Action Complete Regulatory Process • 26 sites • submitted as Corrective Action Complete (2006) • NMED public comment period (2008) • Public Hearing requested on 24 of 26 • 5 sites • submitted as Corrective Action Complete (2008) 13

  14. 31 SWMUs/AOCs in Corrective Action Complete Regulatory Process • NMED April 8, 2010 letter - NMED issue public notice on 31 SWMUs, as part of draft RCRA permit being developed for SNL • 1 SWMU - NMED needs more information • 2 SWMUs - continue monitoring GW wells (149,154) • 3 SWMUs - need GW monitoring wells (8,58,68) • 25 SWMUs – no additional corrective actions (pending regulatory process) 14

  15. Burn Site GW AOC Background & Status • GW monitored since 1996 • Detected contaminates in GW: • Nitrates: 0 to 35 ppm (standard 10 ppm) • Perchlorate: 0 to 9 ppb (no drinking standard) • NMED requested workplan, soil & GW characterization (2009) • Workplan submitted (November 2009) • NMED approved workplan (February 2010) • Field characterization planned (Summer 2010) 15

  16. N 16

  17. Tijeras Arroyo GW AOCBackground & Status • GW monitored since 1992 • Detected contaminates in GW: • Nitrates: 0 to 30 ppm (standard 10 ppm) • Trichloroethylene (TCE): 0 to 7 ppb (standard 5 ppb) • AOC covers several square miles • Four potential contributors: • natural infiltration from Tijeras Arroyo • SNL • KAFB, and • City of Albuquerque • NMED approved Groundwater Investigation Report (February 2010) • NMED reviewing Corrective Measure Evaluation Report from 2005 17

  18. Boundary of Nitrate Plume in Perched, Tijeras Arroyo GW above 10 ppm 18

  19. Technical Area V GW AOC Background & Status • GW monitored since 1992 • Detected contaminates in GW: • Nitrates: 0 to 12 ppm (standard 10 ppm) • TCE: 0 to 16 ppb (standard 5 ppb) • 13 monitoring wells already installed • Awaiting NMED approval to install 4 additional GW wells + soil vapor wells 19

  20. N Technical Area V 20

  21. SummarySandia’s ER Project • Completely closed 232 of 265 ER sites • Addressing remaining 33 ER sites & 3 GW AOCs • CWL: installing new monitoring wells • MWL: NMED reviewing report documenting cover construction • 31 CAC sites: 1 needs info, 2 continue GW, 3 need GW wells, all subject to public review with SNL permit • Burn Site GW AOC: more GW & soil investigations 2010 • Tech Area V GW AOC: awaiting NMED approval more investigations • Tijeras Arroyo GW AOC: awaiting NMED review of Corrective Measures Evaluation Report 21

  22. For More Information • For more information about Sandia’s ER Project, go to SNL’s Long-Term Environmental Stewardship (LTES) web site http://ltes.sandia.gov/ • click on “Legacy” 22

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