Download - Presentation for City of Brisbane
Presentation for
City of Brisbane
Final Peer Review Findings
November 7, 2005 (Revised May 10, 2006)
Presentation OutlinePresentation Outline
PurposePurpose Project OverviewProject Overview Summary of FindingsSummary of Findings Background and Regulatory FrameworkBackground and Regulatory Framework Objectives and Evaluation CriteriaObjectives and Evaluation Criteria FindingsFindings RecommendationsRecommendations DiscussionDiscussion
PurposePurpose
Update April 2005 workshopUpdate April 2005 workshop Supplemental dataSupplemental data
Refine findingsRefine findings Information to dateInformation to date
Update recommendationsUpdate recommendations
Project OverviewProject Overview
Baylands project areaBaylands project area Former Brisbane landfill Former Brisbane landfill Southern Pacific Railroad facilitySouthern Pacific Railroad facility
Phase 1 developmentPhase 1 development Former Brisbane landfillFormer Brisbane landfill
Future development phases Future development phases Southern Pacific Railroad facilitySouthern Pacific Railroad facility
Site MapSite 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.
Summary of Findings – LandfillSummary of Findings – Landfill
Evaluation category Assessment
Risk assessment• Human health• Ecological
• Evaluations incomplete• Final assessments pending
Limits of waste• Adequately defined, except for southern boundary• Agree with plan to extend landfill cap to edge of Guadalupe Channel
Landfill Settlement• Evaluation incomplete
• Future studies needed
Landfill gas• Concur majority of organic waste is decomposed• Recommend re-initiation of monitoring activities
Groundwater Quality • Adequately characterized.
Leachate • Seeps into surface and groundwater adequately characterized
Remedial approach
• Evaluation incomplete – dependent on approved development plan• Final closure plan not prepared but will address:
• Gas control system• Final cover and surface water control• Settlement• Human Health and Ecological assessments
Summary of Findings – OU-1Summary of Findings – OU-1
Evaluation category Assessment
Risk assessment• Human health• Ecological
• Evaluations incomplete• Final assessments pending
Groundwater
• Generally adequately characterized• Treatment system mitigates infiltration into Sunnydale Sewer• Additional information is needed for
• DNAPL source (residual or upgradient)• A-aquitard discontinuity/B-Aquifer contaminant mechanism
• RAP in DTSC review
Soil• Evaluation incomplete• DTSC request additional work –
• Site characterization• Remedial action workplan
Surface water• Adequately characterized
• Groundwater treatment system mitigates infiltration into Sunnydale Sewer
Soil vapor • Future studies likely needed based on final development plan
Remedial approach• Evaluation incomplete• Remedial action plans in review/preparation• Overall proposed approach consistent with industry practice• Final RAP dependent on approved development plan
Summary Findings – OU-2Summary Findings – OU-2
Evaluation category Assessment
Risk assessment• Human health• Ecological
• Evaluations incomplete• Final assessments pending
Soil & groundwater• Adequately characterized
Soil vapor
• Depending on final approved development plan, future studies may be required
Surface water• Adequately characterized
Remedial approach
• Interim approach consistent with industry practice• Soil vapor study may be required for potential vapor migration• Final RAP dependent on approved development plan
• Adoption of future RWQCB Site Cleanup Order
Background and Regulatory FrameworkBackground and Regulatory Framework
Brisbane LandfillBrisbane Landfill Former municipal landfill (1933-1967)Former municipal landfill (1933-1967) RWQCB and County of San Mateo Environmental RWQCB and County of San Mateo Environmental
Health Division (County)Health Division (County) Groundwater Operable Unit 1 (OU-1)Groundwater Operable Unit 1 (OU-1)
Former Southern Pacific Railroad Facility (1914-Former Southern Pacific Railroad Facility (1914-1960) and Schlage Lock Facility (1926-1999)1960) and Schlage Lock Facility (1926-1999)
California Department of Toxic Substances California Department of Toxic Substances Control (DTSC)Control (DTSC)
Groundwater Operable Unit 2 (OU-2)Groundwater Operable Unit 2 (OU-2) Former Southern Pacific Railroad Facility (1914-Former Southern Pacific Railroad Facility (1914-
1960)1960) RWQCBRWQCB
Objectives and Evaluation CriteriaObjectives and Evaluation Criteria
ObjectivesObjectives Provide independent technical reviewProvide independent technical review Serve as community advocateServe as community advocate Support the dissemination of project informationSupport the dissemination of project information
Evaluation CriteriaEvaluation Criteria Adequacy of environmental characterizationAdequacy of environmental characterization Appropriateness of remedial actionAppropriateness of remedial action Protective of public health and environmentProtective of public health and environment
Peer Review Role In Baylands Planning ProcessPeer Review Role In Baylands Planning Process
Findings – Brisbane Landfill Findings – Brisbane Landfill
Adequacy of Environmental CharacterizationAdequacy of Environmental Characterization Evaluation adequateEvaluation adequate
– Limits of waste, except for southern boundaryLimits of waste, except for southern boundary– Landfill gasLandfill gas– Groundwater qualityGroundwater quality– LeachateLeachate
Evaluation incompleteEvaluation incomplete– Landfill settlementLandfill settlement
Findings – Brisbane Landfill Cont.Findings – Brisbane Landfill Cont.
Appropriateness of Remedial ActionAppropriateness of Remedial Action Final remedial action plan not developedFinal remedial action plan not developed Primary issues associated with landfill closurePrimary issues associated with landfill closure
– Landfill gas generation and migrationLandfill gas generation and migration– Leachate generation and transport into groundwater Leachate generation and transport into groundwater
and surface waterand surface water– Settlement of the landfill surfaceSettlement of the landfill surface
Proposed concept is appropriateProposed concept is appropriate– Lacks sufficient detailLacks sufficient detail
Remedial Approach – Brisbane LandfillRemedial Approach – Brisbane Landfill
Findings – Brisbane Landfill Cont.Findings – Brisbane Landfill Cont.
Protective of Public Health and EnvironmentProtective of Public Health and Environment Overall concept appropriate – final evaluations Overall concept appropriate – final evaluations
not completenot complete Final closure plan - not preparedFinal closure plan - not prepared Final risk assessments - not preparedFinal risk assessments - not prepared
Human healthHuman health Primary concern Primary concern
– Landfill gasLandfill gas
Ecological Ecological Primary concern Primary concern
– Leachate seepsLeachate seeps
Findings – Operable Unit 1Findings – Operable Unit 1
Adequacy of Environmental CharacterizationAdequacy of Environmental Characterization Primary site contaminantsPrimary site contaminants
VOC’s, TPH as Bunker C, metalsVOC’s, TPH as Bunker C, metals Soil – Evaluation incompleteSoil – Evaluation incomplete
Additional investigation requested by DTSCAdditional investigation requested by DTSC Revised RAP in progressRevised RAP in progress
Groundwater – Generally characterizedGroundwater – Generally characterized Clarification needed for:Clarification needed for:
– A-zone aquitard continuity (‘windows’)A-zone aquitard continuity (‘windows’)– B-zone contamination sourceB-zone contamination source
Soil Vapor – Evaluation incompleteSoil Vapor – Evaluation incomplete Risk Assessments – Evaluation incomplete Risk Assessments – Evaluation incomplete
Pending final development planPending final development plan
Site Map – Operable Unit 1Site Map – Operable Unit 1
Stratigraphic TerminologyStratigraphic Terminology
PossibleGap
Simplified Conceptual Aquifer DevelopmentSimplified Conceptual Aquifer Development
West East
Findings – Operable Unit 1 Cont.Findings – Operable Unit 1 Cont.
Appropriateness of Remedial ActionAppropriateness of Remedial Action Remedial approachRemedial approach
Limited soil excavation at two locations (VOCs)Limited soil excavation at two locations (VOCs) Continued operation of groundwater treatment Continued operation of groundwater treatment
systemsystem– Add three extraction wells Add three extraction wells – Add two monitoring wellsAdd two monitoring wells
Soil capSoil cap Vapor barriers, as neededVapor barriers, as needed Engineering and Institutional ControlsEngineering and Institutional Controls
– Reduce/eliminate human health exposureReduce/eliminate human health exposure
Proposed Remedial Action – Operable Unit 1 Proposed Remedial Action – Operable Unit 1 (Profile)(Profile)
Proposed Remedial Action – OU-1 Proposed Remedial Action – OU-1 Commercial ScenarioCommercial Scenario
Legend
Proposed Area of Soil Removal
Proposed Additional GW Monitoring Well
Proposed Additional GW Extraction Well
Engineering Control – Indoor Inhalation
Engineering Control – Restrict Groundwater Use
Engineering Control – Outdoor Inhalation
Modified from Burns & McDonnell, Revised Groundwater RAP, Operable Unit 1, January 27, 2005.
Findings – Operable Unit 1 Cont.Findings – Operable Unit 1 Cont.
Protective of Public Health and EnvironmentProtective of Public Health and Environment Evaluation incompleteEvaluation incomplete
Site RAPs not completeSite RAPs not complete Final development plan pendingFinal development plan pending Proposed remedial concept – generally Proposed remedial concept – generally
acceptableacceptable Human healthHuman health
Final risk assessment pendingFinal risk assessment pending EcologicalEcological
Assessment not performed/identifiedAssessment not performed/identified Final risk assessment recommendedFinal risk assessment recommended
Findings – Operable Unit 2Findings – Operable Unit 2
Adequacy of Environmental CharacterizationAdequacy of Environmental Characterization Primary site contaminants: Primary site contaminants:
TPH as Bunker C, metals, VOCsTPH as Bunker C, metals, VOCs Soil and groundwater – adequately characterizedSoil and groundwater – adequately characterized Surface Water - adequately characterizedSurface Water - adequately characterized Soil Vapor – evaluation incompleteSoil Vapor – evaluation incomplete Risk Assessments – evaluation incompleteRisk Assessments – evaluation incomplete
Pending final development planPending final development plan
Findings – Operable Unit 2 Cont.Findings – Operable Unit 2 Cont.
Appropriateness of Remedial ActionAppropriateness of Remedial Action Remedial approach (interim)Remedial approach (interim)
Soil Cap - 7 to 10 feet clean soilSoil Cap - 7 to 10 feet clean soil– Leave in-place TPH and metals impacted soilsLeave in-place TPH and metals impacted soils– Limited VOC soil removal (Spring 2006)Limited VOC soil removal (Spring 2006)
Abandon existing north-south drainage channelAbandon existing north-south drainage channel– Replace with interim drainage channel (Spring 2006)Replace with interim drainage channel (Spring 2006)
Engineering and Institutional ControlsEngineering and Institutional Controls– Reduce/eliminate human exposureReduce/eliminate human exposure– Not defined/delineatedNot defined/delineated
Site Contaminants – Operable Units 1 and 2Site Contaminants – Operable Units 1 and 2
Proposed Remedial Action – Operable Unit 2Proposed Remedial Action – Operable Unit 2
Findings – Operable Unit 2 Cont.Findings – Operable Unit 2 Cont.
Protective of Public Health and EnvironmentProtective of Public Health and Environment Evaluation IncompleteEvaluation Incomplete
Interim RAP approved by RWQCBInterim RAP approved by RWQCB Final Site RAP pendingFinal Site RAP pending RWQCB Site Cleanup Order pendingRWQCB Site Cleanup Order pending
Human healthHuman health Proposed remedial concept – generally acceptableProposed remedial concept – generally acceptable
– Final risk assessment pendingFinal risk assessment pending– Evaluate for applicability to current standardsEvaluate for applicability to current standards– Soil vapor not evaluatedSoil vapor not evaluated
Ecological – acceptableEcological – acceptable Proposed concept addresses ecological riskProposed concept addresses ecological risk
– Based on SFIA valuesBased on SFIA values– Evaluate for applicability to current standardsEvaluate for applicability to current standards
Overall interim concept appropriate – final evaluation Overall interim concept appropriate – final evaluation not completenot complete
RecommendationsRecommendations
GeneralGeneral Subarea specificSubarea specific
Brisbane landfillBrisbane landfill OU-1OU-1 OU-2OU-2
Next stepsNext steps Note: not all steps required immediatelyNote: not all steps required immediately
Recommendations – GeneralRecommendations – General
Financial assuranceFinancial assurance Mechanism to manage long-term uncertainties Mechanism to manage long-term uncertainties
associated with maintenance of streets, utilities, associated with maintenance of streets, utilities, etcetc
Conceptual site model and remedial action planConceptual site model and remedial action plan Integrated development-based Baylands planIntegrated development-based Baylands plan Establish evaluation and remedial approachEstablish evaluation and remedial approach Develop early in project approval processDevelop early in project approval process
Continue evaluation of Baylands environmental Continue evaluation of Baylands environmental documents and plansdocuments and plans
Recommendations – Brisbane LandfillRecommendations – Brisbane Landfill
Risk assessmentRisk assessment Final human health assessmentFinal human health assessment Ecological assessmentEcological assessment
Landfill surface settlement evaluationLandfill surface settlement evaluation Settlement studies Settlement studies
Final cover design and constructionFinal cover design and construction Landfill coverLandfill cover
– Single, integrated unitSingle, integrated unit– Prevent surface water infiltration and minimize Prevent surface water infiltration and minimize
leachate seepsleachate seeps
Recommendations – Brisbane Landfill Cont.Recommendations – Brisbane Landfill Cont.
Landfill gas and monitoringLandfill gas and monitoring Vapor barriers & methane monitoringVapor barriers & methane monitoring Explosion proof construction – underground Explosion proof construction – underground
utilitiesutilities Groundwater monitoringGroundwater monitoring
Post-closure monitoring programPost-closure monitoring program Post-closure monitoring and maintenance plansPost-closure monitoring and maintenance plans
Recommendations – Operable Unit 1Recommendations – Operable Unit 1
Provide additional information to address:Provide additional information to address: Soil contamination – type and extentSoil contamination – type and extent GroundwaterGroundwater
– A-aquitard ‘windows’A-aquitard ‘windows’– DNAPL sourceDNAPL source– B-Sand aquifer – VOC sourceB-Sand aquifer – VOC source
Consider benefits of in-situ treatment Consider benefits of in-situ treatment technologiestechnologies Source reduction Source reduction Augment proposed final remedial approachAugment proposed final remedial approach
Human health and ecological riskHuman health and ecological risk Complete final assessmentsComplete final assessments
Recommendations – Operable Unit 2Recommendations – Operable Unit 2
Update soil remedial action planUpdate soil remedial action plan VOC soil vaporVOC soil vapor
Update soil management plan and residual risk Update soil management plan and residual risk management planmanagement plan
Consider in-situ bioremediation treatmentConsider in-situ bioremediation treatment Source reduction Source reduction Augment proposed final remedial approachAugment proposed final remedial approach
Human health and ecological riskHuman health and ecological risk Complete final assessmentsComplete final assessments
Recommendations – Operable Unit 2 Cont.Recommendations – Operable Unit 2 Cont.
Prepare monitoring plan for post well Prepare monitoring plan for post well abandonment and replacement planabandonment and replacement plan
Assess the brick-lined arch sewerAssess the brick-lined arch sewer Structural integrity for proposed tie-inStructural integrity for proposed tie-in
Evaluate long-term settlementEvaluate long-term settlement Final remedial approach consistent with future Final remedial approach consistent with future
RWQCB site cleanup orderRWQCB site cleanup order
Recommendations - Next StepsRecommendations - Next Steps
Develop integrated site conceptual model and Develop integrated site conceptual model and development-based Remedial Action Plandevelopment-based Remedial Action Plan
City meet with regulatory agencies to discuss City meet with regulatory agencies to discuss path forward with respect to future requirementspath forward with respect to future requirements
Review revised specific plan and development Review revised specific plan and development conceptconcept
Evaluate future environmental documents as Evaluate future environmental documents as deemed necessarydeemed necessary
Future Studies and SequencingFuture Studies and Sequencing
Landfill
OU-1
OU-2
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
DiscussionDiscussion