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Comprehensive Environmental Assessment for LCLS Facility

Explore existing environmental conditions, potential issues during construction and operation, regulatory framework, groundwater flow, non-radiological hazards, and radiological aspects for the proposed LCLS facility.

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Comprehensive Environmental Assessment for LCLS Facility

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  1. ES&H for the LCLSTess Byler, SLACApril 24, 2002 • Existing Environmental Conditions for the proposed LCLS • Potential Environmental Issues for LCLS during construction and operation Tess Byler, ES&H

  2. Existing Environmental Conditions for the proposed LCLS • Site Setting • Soil and Groundwater Conditions Tess Byler, ES&H

  3. Existing Environmental Conditions for the proposed LCLS • Bedrock uplands • Active tectonic area • San Francisquito Creek Tess Byler, ES&H

  4. Aerial view of LCLS Aerial View of SLAC Showing LCLS Layout LCLS I-280 I-280 Sand Hill Rd Sand Hill Rd Tess Byler, ES&H

  5. Proposed LCLS layout Tess Byler, ES&H

  6. Regulatory Framework • Facility wide air permitting for non-radiological parameters (permit in process) • Wastewater discharges to Sanitary Sewer under three discharge permits • Stormwater discharge under “General Permit” Tess Byler, ES&H

  7. Regulatory Framework • Evaluation by EPA Hazard Ranking System determined that SLAC was in category “No Further Response Action Planned” (EPA Memo September 21, 1992) • RWQCB Order 85-88 for former leaking underground waste solvent tank, other areas in voluntary cleanups Tess Byler, ES&H

  8. Groundwater Flow and Site Investigation Areas Tess Byler, ES&H

  9. Groundwater Wells in the Research Yard Tess Byler, ES&H

  10. Soil and Surface Sediment Summary Tess Byler, ES&H

  11. Soil and Surface Sediment Summary- Research Yard Tess Byler, ES&H

  12. Potential Non-Radiological Issues • Construction Phase • Tunnel • Soil Management Plan Required • Stormwater Pollution Prevention Plan required • Short term traffic issues • Special status species and potential wetlands Tess Byler, ES&H

  13. Potential Non-Radiological Issues • Operation Phase • Traffic: Integration with SLAC and Stanford Long Range Development Plan • Utilities • Potential hazards and processes in place to eliminate of minimize hazards • Potential Accident & Emergencies • Total cumulative effects at SLAC Tess Byler, ES&H

  14. Radiological Environmental Aspects • Operation Phase – Potential Public Exposure • Maximum direct off-site exposure limit –10mR/year (DOE/USEPA Mandated) • SLAC contribution to background ~5 mR/year • Additional estimated contribution from LCLS to background ~0.2 mR/year • Operation Phase – Potential Environmental Issues • No expectations of any significant tritium production from LCLS. (based on calculations and projected low beam power) • No soil activation expected (low beam power and short lived radio-nuclides) Tess Byler, ES&H

  15. Conclusions • Potential Non-Radiological hazards are low for LCLS • Potential Radiological Hazards are low for LCLS • Potential Environmental Effects have been evaluated and addressed Tess Byler, ES&H

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