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Presentation for City of Brisbane

Presentation for City of Brisbane. Final Peer Review Findings. November 7, 2005 (Revised May 10, 2006). Presentation Outline. Purpose Project Overview Summary of Findings Background and Regulatory Framework Objectives and Evaluation Criteria Findings Recommendations Discussion.

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Presentation for City of Brisbane

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  1. Presentation for City of Brisbane Final Peer Review Findings November 7, 2005 (Revised May 10, 2006)

  2. Presentation Outline • Purpose • Project Overview • Summary of Findings • Background and Regulatory Framework • Objectives and Evaluation Criteria • Findings • Recommendations • Discussion

  3. Purpose • Update April 2005 workshop • Supplemental data • Refine findings • Information to date • Update recommendations

  4. Project Overview • Baylands project area • Former Brisbane landfill • Southern Pacific Railroad facility • Phase 1 development • Former Brisbane landfill • Future development phases • Southern Pacific Railroad facility

  5. Site Map Modified from Workshop Presentation to the City of Brisbane, Brisbane Baylands, Subsurface Environmental Conditions by Universal Paragon Corporation and Burns & McDonnell Engineering Company, Inc., November 18, 2003.

  6. Summary of Findings – Landfill

  7. Summary of Findings – OU-1

  8. Summary Findings – OU-2

  9. Background and Regulatory Framework • Brisbane Landfill • Former municipal landfill (1933-1967) • RWQCB and County of San Mateo Environmental Health Division (County) • Groundwater Operable Unit 1 (OU-1) • Former Southern Pacific Railroad Facility (1914-1960) and Schlage Lock Facility (1926-1999) • California Department of Toxic Substances Control (DTSC) • Groundwater Operable Unit 2 (OU-2) • Former Southern Pacific Railroad Facility (1914-1960) • RWQCB

  10. Objectives and Evaluation Criteria • Objectives • Provide independent technical review • Serve as community advocate • Support the dissemination of project information • Evaluation Criteria • Adequacy of environmental characterization • Appropriateness of remedial action • Protective of public health and environment

  11. Peer Review Role In Baylands Planning Process

  12. Findings – Brisbane Landfill Adequacy of Environmental Characterization • Evaluation adequate • Limits of waste, except for southern boundary • Landfill gas • Groundwater quality • Leachate • Evaluation incomplete • Landfill settlement

  13. Findings – Brisbane Landfill Cont. • Appropriateness of Remedial Action • Final remedial action plan not developed • Primary issues associated with landfill closure • Landfill gas generation and migration • Leachate generation and transport into groundwater and surface water • Settlement of the landfill surface • Proposed concept is appropriate • Lacks sufficient detail

  14. Remedial Approach – Brisbane Landfill

  15. Findings – Brisbane Landfill Cont. Protective of Public Health and Environment • Overall concept appropriate – final evaluations not complete • Final closure plan - not prepared • Final risk assessments - not prepared • Human health • Primary concern • Landfill gas • Ecological • Primary concern • Leachate seeps

  16. Findings – Operable Unit 1 Adequacy of Environmental Characterization • Primary site contaminants • VOC’s, TPH as Bunker C, metals • Soil – Evaluation incomplete • Additional investigation requested by DTSC • Revised RAP in progress • Groundwater – Generally characterized • Clarification needed for: • A-zone aquitard continuity (‘windows’) • B-zone contamination source • Soil Vapor – Evaluation incomplete • Risk Assessments – Evaluation incomplete • Pending final development plan

  17. Site Map – Operable Unit 1

  18. Stratigraphic Terminology Possible Gap

  19. Simplified Conceptual Aquifer Development East West

  20. Findings – Operable Unit 1 Cont. Appropriateness of Remedial Action • Remedial approach • Limited soil excavation at two locations (VOCs) • Continued operation of groundwater treatment system • Add three extraction wells • Add two monitoring wells • Soil cap • Vapor barriers, as needed • Engineering and Institutional Controls • Reduce/eliminate human health exposure

  21. Proposed Remedial Action – Operable Unit 1 (Profile)

  22. Proposed Remedial Action – OU-1 Commercial Scenario Engineering Control – Restrict Groundwater Use Engineering Control – Outdoor Inhalation Engineering Control – Indoor Inhalation Legend Proposed Area of Soil Removal Proposed Additional GW Monitoring Well Proposed Additional GW Extraction Well Modified from Burns & McDonnell, Revised Groundwater RAP, Operable Unit 1, January 27, 2005.

  23. Findings – Operable Unit 1 Cont. Protective of Public Health and Environment • Evaluation incomplete • Site RAPs not complete • Final development plan pending • Proposed remedial concept – generally acceptable • Human health • Final risk assessment pending • Ecological • Assessment not performed/identified • Final risk assessment recommended

  24. Findings – Operable Unit 2 Adequacy of Environmental Characterization • Primary site contaminants: • TPH as Bunker C, metals, VOCs • Soil and groundwater – adequately characterized • Surface Water - adequately characterized • Soil Vapor – evaluation incomplete • Risk Assessments – evaluation incomplete • Pending final development plan

  25. Findings – Operable Unit 2 Cont. Appropriateness of Remedial Action • Remedial approach (interim) • Soil Cap - 7 to 10 feet clean soil • Leave in-place TPH and metals impacted soils • Limited VOC soil removal (Spring 2006) • Abandon existing north-south drainage channel • Replace with interim drainage channel (Spring 2006) • Engineering and Institutional Controls • Reduce/eliminate human exposure • Not defined/delineated

  26. Site Contaminants – Operable Units 1 and 2

  27. Proposed Remedial Action – Operable Unit 2

  28. Findings – Operable Unit 2 Cont. Protective of Public Health and Environment • Evaluation Incomplete • Interim RAP approved by RWQCB • Final Site RAP pending • RWQCB Site Cleanup Order pending • Human health • Proposed remedial concept – generally acceptable • Final risk assessment pending • Evaluate for applicability to current standards • Soil vapor not evaluated • Ecological – acceptable • Proposed concept addresses ecological risk • Based on SFIA values • Evaluate for applicability to current standards • Overall interim concept appropriate – final evaluation not complete

  29. Recommendations • General • Subarea specific • Brisbane landfill • OU-1 • OU-2 • Next steps • Note: not all steps required immediately

  30. Recommendations – General • Financial assurance • Mechanism to manage long-term uncertainties associated with maintenance of streets, utilities, etc • Conceptual site model and remedial action plan • Integrated development-based Baylands plan • Establish evaluation and remedial approach • Develop early in project approval process • Continue evaluation of Baylands environmental documents and plans

  31. Recommendations – Brisbane Landfill • Risk assessment • Final human health assessment • Ecological assessment • Landfill surface settlement evaluation • Settlement studies • Final cover design and construction • Landfill cover • Single, integrated unit • Prevent surface water infiltration and minimize leachate seeps

  32. Recommendations – Brisbane Landfill Cont. • Landfill gas and monitoring • Vapor barriers & methane monitoring • Explosion proof construction – underground utilities • Groundwater monitoring • Post-closure monitoring program • Post-closure monitoring and maintenance plans

  33. Recommendations – Operable Unit 1 • Provide additional information to address: • Soil contamination – type and extent • Groundwater • A-aquitard ‘windows’ • DNAPL source • B-Sand aquifer – VOC source • Consider benefits of in-situ treatment technologies • Source reduction • Augment proposed final remedial approach • Human health and ecological risk • Complete final assessments

  34. Recommendations – Operable Unit 2 • Update soil remedial action plan • VOC soil vapor • Update soil management plan and residual risk management plan • Consider in-situ bioremediation treatment • Source reduction • Augment proposed final remedial approach • Human health and ecological risk • Complete final assessments

  35. Recommendations – Operable Unit 2 Cont. • Prepare monitoring plan for post well abandonment and replacement plan • Assess the brick-lined arch sewer • Structural integrity for proposed tie-in • Evaluate long-term settlement • Final remedial approach consistent with future RWQCB site cleanup order

  36. Recommendations - Next Steps • Develop integrated site conceptual model and development-based Remedial Action Plan • City meet with regulatory agencies to discuss path forward with respect to future requirements • Review revised specific plan and development concept • Evaluate future environmental documents as deemed necessary

  37. Future Studies and Sequencing Future Studies & Program Sequence A Supplemental Data Review B Prior to/concurrent with CEQA C Required by CEQA D Development Plan E Post Development Plan Landfill OU-1 OU-2

  38. Discussion

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