remediation of a Γολδερ former dry cleaner spruce grove ... · former dry cleaner spruce...
TRANSCRIPT
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Γολδερ Γολδερ ΓολδερΑσσοχιατεσΑσσοχιατεσΑσσοχιατεσ♣♣♣≤≤≤
A Mine is a Terrible Thing to WasteA Mine is a Terrible Thing to Waste
Remediation of aRemediation of aFormer Dry CleanerFormer Dry Cleaner
Spruce Grove, AlbertaSpruce Grove, AlbertaM. Jillian M. Jillian MittonMitton - Golder Associates Ltd - Golder Associates Ltd
CoellenCoellen LinkieLinkie –– GWL Realty Advisors Inc. GWL Realty Advisors Inc.REMTECH 2003REMTECH 2003
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OutlineOutline
Background
Risk Management
Remediation Options
Remediation Program
Remediation Results
Post Remediation Monitoring
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Site LocationSite Location
Avenue
Street
Laneway
Former Dry
Cleaner
Church P
roperty
N
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BackgroundBackground
Dry cleaning facilityfor 25 years
Land zoned forcommercial land-use
11 adjacentbusinesses
Off-site landcontains a church(residential landuse)
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Site PlanLocation of
Dry Cleaner
MachinesWaste Storage
Area
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Geology
Fill
Clayey Silt
Clayey Silt (Till)
West EastCommercial Property Church PropertyLaneway0 m
1 m
5 m
2 m
3 m
4 m
6 m
7 m
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Area of Impacted Soil andGroundwater (CCME 2002)
Tier 1 Soil Impacts
Tier 1 GW Impacts
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Risk ManagementRisk Management
Air Quality Monitoring
Risk Assessment - No risk to currentoccupants and adjacent businesses
Alberta Environment accepted riskmanagement plan to conduct quarterlyair monitoring and semi annualgroundwater monitoring
Church accepted risk management plan
Vacated current dry cleaner tenant
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OwnerOwner’’s Business Objectivess Business Objectives
Wanted to sell property
Property worth $3 Million in August2000
Property on market for 1 year
Potential purchasers wantedsignificant “hair-cut” off thepurchase price and for the owner toretain all environmental liability.
Decision to remediate to avoid asignificant reduction of purchase price
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Remediation OptionsRemediation Options
Exsitu remedial techniques were limiteddue to distribution of contamination inthe subsurface
Insitu remedial techniques did not meetowner’s time frame and were notfeasible
Decision to derive Tier 2 soil andgroundwater guidelines using theCCME 2000 and AENV 2001methodology
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Guideline TiersGuideline Tiers
Tier 1 – Generic Guidelines
Tier 2 – Modified Generic Guidelines
Tier 3 – Site Specific Risk Assessment
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PCE Tier 2 Soil andPCE Tier 2 Soil andGroundwater GuidelinesGroundwater Guidelines
13.7 mg/LFinal Groundwater Guideline
34 mg/kgFinal Soil Guideline
Not relevantProtection of Aquatic Life
34 mg/kgSoil Contact
Not relevantProtection of Potable Groundwater
39 mg/kgHuman Vapour Inhalation
12435 mg/kgHuman Dermal Contact
2139 mg/kgHuman Soil Ingestion
GuidelineExposure Pathway
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Area of Impacted Soil andGroundwater (Tier 2)
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Tier 2 Approach90% Reduction in the Volume
Requiring Remediation
$2 Million $0.5 Million
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Remediation ProgramRemediation Program
Source removal via soil excavation tomeet Tier 2
Insitu chemical oxidation program(potassium permanganate) ascontingency for impacted groundwater ifrequired
Total Cost $800,000
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Communication PlanCommunication Plan
Letter to Tenants
Public Meeting(Flyer)
Presentation/Q&A
Tenants’ Concernsblocking fire lane andfire exitsblocking deliveriesvibrations (Bank)
GMS Website
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H&S and Air QualityH&S and Air Quality
Air qualitymonitoring (EHSgroup)
Two large fans usedto vent workingspaceAir monitoring of allworking spaces,staging area,adjacent businessesintermittent (real-time) and long term(PCE, carbon
id d t)
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The ApproachThe Approach
Interior and exterior excavationsinterior first, then exteriorseveral smaller manageable excavations
Removal of piles and load-bearingelements
Reinforcement of structure
Slopes of excavation and safety ofworkers
Compaction and settlement
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Source Removal PlanSource Removal Plan
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Building PreparationBuilding Preparation
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Slope ManagementSlope Management
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Interior ExcavationInterior Excavation
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Backfill MaterialsBackfill Materials
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Exterior ExcavationExterior Excavation
Power, gas, phone,water, sanitarysewer
Mystery utilities -storm sewer &power
Two optionsre-routemanage in place
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Utility SupportUtility Support
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Contingency OxidationSystem
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Contingency OxidationSystem
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Oxidant System InstallationOxidant System Installation
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Oxidant System InstallationOxidant System Installation
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Backfill & CompactionBackfill & Compaction
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The Final ResultThe Final Result
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Post Remediation MonitoringPost Remediation Monitoring
Confirmatory soil sampling met Tier 2
3 and 12 months after the remediationwork, groundwater samples met Tier 2
Report submitted to AlbertaEnvironment for “Comfort” letter
Received “Comfort” letter on July 8,2003
Two vacant units have been leased
Property is “For Sale”