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Carmichael Town Hall Meeting Western Groundwater Operable Unit - Update

Carmichael Town Hall Meeting Western Groundwater Operable Unit - Update. 12 March 2008 Alexander MacDonald (RWQCB) 916-464-4625 amacdonald@waterboards.ca.gov. Outline. Background and Regulatory Perspective 2004 Plume in Carmichael Contaminant Plumes in 2008 Work Completed Since 2004

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Carmichael Town Hall Meeting Western Groundwater Operable Unit - Update

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  1. Carmichael Town Hall MeetingWestern Groundwater Operable Unit - Update 12 March 2008 Alexander MacDonald (RWQCB) 916-464-4625 amacdonald@waterboards.ca.gov

  2. Outline • Background and Regulatory Perspective • 2004 Plume in Carmichael • Contaminant Plumes in 2008 • Work Completed Since 2004 • The Big Picture

  3. Interstate 80 Aerojet American River Sacramento US 50 Sunrise Boulevard Interstate 99

  4. Background • Aerojet - Superfund Cleanup Site -1982 • Oversight Provided by State and USEPA • Past Operations Led to Soil and Groundwater Pollution • Primary Focus – Off-site Groundwater • Western Groundwater Operable Unit

  5. Western Groundwater Operable Unit Area 4 Area 2 Aerojet Area 3 Area 1 N IRCTS

  6. Contaminants of Concern • Solvents - TCE, PCE, Freon, Chloroform • Perchlorate – component of solid rocket propellant • N-nitrosodimethyhylamine (NDMA) – associated with liquid rocket fuel

  7. NDMA • Found in Hydrazine-Based Rocket Fuel • Found in hotdogs, smoked/cured meats, malted beverages, and tobacco • Public Health Goal is 3 ppt (Dec 06) • No Drinking Water Standard • DHS Notification Level is 10 ppt

  8. ND ND Carmichael Water District Drinking Water Wells Groundwater Flow Direction ND 93 ND 270 50 ND 300 34 51 7 Existing Monitor Wells 6 ND ND ND Proposed Monitor Wells ND Arden-Cordova Water Service Wells 2004 NDMA Plume

  9. What Has Been Done in Area 4 • Additional Groundwater Monitor and Extraction Wells Built • Construction and Operation of the GET L-B Facility on Bajamont - 2007 • Negotiated Agreement with Sacramento County to Allow Construction GET L in Ancil Hoffman Park – begin construction in Summer 2008 • Treated water to be used on the golf course • Modifed Aerojet’s Permit to Discharge Treated Water to the American River • CEQA Completed

  10. Carmichael Water District Wells Groundwater Flow Direction GET L-B Operating New Monitoring Wells Ancil Hoffman Park New Extraction Wells Changes Since June 04

  11. ND ND Carmichael Water District Wells Groundwater Flow Direction 67 ND ND ND 180 ND 78 ND 39 2J 430 42 Monitor Wells 1.8J 36 ND NDMA Layer C Arden-Cordova Water Service Wells

  12. ND ND Carmichael Water District Wells Groundwater Flow Direction ND 98 350 ND 1.4J ND 250 ND 39 ND 78 ND Monitor Wells ND ND ND ND Arden-Cordova Water Service Wells NDMA Layer D ND

  13. ND ND Carmichael Water District Wells Groundwater Flow Direction 1.9J ND ND ND 4.7 ND ND ND ND ND 7.8 4.5 Monitor Wells 3.3J 1.8 2.0J Perchlorate Layer C Arden-Cordova Water Service Wells

  14. ND ND Carmichael Water District Wells Groundwater Flow Direction ND 1.4J 5.9 ND 2.2J ND 4.6 ND ND ND 6.7 ND Monitor Wells ND ND ND Arden-Cordova Water Service Wells Perchlorate Layer D ND

  15. Next Steps • Complete Construction of GET L-A - 2009 • Complete Construction of GET K – 2008/9 • Operate Systems and Evaluate Capture – modify systems as needed • Treatment Facilities Designed to Allow for Expansion

  16. Carmichael Water District Wells GET L-B DONE Potential Extraction Well Ancil Hoffman Park GET KA GET L-A Next Steps

  17. Future Extraction Locations Area for new extraction wells N • Current flow 13,000 gpm • 86 billion gallons treated to date • Estimated Future Flow – 20,000 gpm • 150 lbs chemicals removed daily • Over 720,000 lbs removed to date

  18. Future GET A Expansion ARGET GET A GET L-A/L-B GET D GET J GET K GET E/F Future GET E/F Expansion GET HA GET HB (Boeing & AGC) WRND GET B N Alpha GET (Boeing) Admin GET (Boeing) AerojetPlumeCapture

  19. Soil Portions of Operable Units Carve-out Land OU-5 – Perimeter Groundwater Boundary OU N Central OU Island OU Eastern OU Cavitt Ranch

  20. Questions

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