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DOC ID© Chevron 2005
Hydrocarbon Impacts and Remedial Action at an Active Service Station
Jeff Linke, Chevron Canada Limited, Vancouver, BC
Saleh A. Haidar, Keystone Environmental, Burnaby, BC
Remediation Technologies Symposium 2006
Fairmont Banff Springs Hotel
October 11, 2006
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2DOC ID© Chevron 2005
WHAT WE LEARNED
Value in Early Communication with Stakeholder Groups
Spend Time to Choose the Right Team
Do Not Hesitate to Innovate
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3DOC ID© Chevron 2005
BACKGROUND
Retail Location Since 1920’s
Chevron Retail Outlet Since 1950’s
Currently Four 46,000L Fiberglass USTs
Maintenance Upgrade Work in the 1990’s
Early Investigation Work in Late 1990’s
On Site Source Removal in Late 1990’s
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4DOC ID© Chevron 2005
PROJECT GOALS
Ensure Safety of All Receptors
Manage Contamination Issue and Liabilities
Obtain CoC for Off-Site Stakeholders
How to Obtain These Goals:
Define and Delineate Hydrocarbon Plume
Abate Further Migration
Remove Existing Contamination
Retain Future Lingering Contamination to Site
Execute Monitoring Strategy
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5DOC ID© Chevron 2005
SITE CHARACTERIZATION
Keystone Environmental Conducts Detailed Site Investigation
62 Boreholes Advanced On and Off-Site
Analyzed > 400 Soil samples for Hydrocarbon Indicators
Analyzed > 500 Ground Water Samples for Hydrocarbon Indicators
Developed Detailed Conceptual Site Model
Conducted Indoor Air Quality Monitoring
Regular Liaison with Stakeholders (i.e. Residents, Local and Provincial Governments)
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6DOC ID© Chevron 2005
SITE LAYOUT
Work Area
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7DOC ID© Chevron 2005
INVESTIGATED AREAS
Soil Data
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8DOC ID© Chevron 2005
INVESTIGATED AREAS
Groundwater Data
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9DOC ID© Chevron 2005
SOIL AND GROUNDWATER PLUME
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10DOC ID© Chevron 2005
PROJECT PLANNING
Evaluate Remedial Options
Series of Options Developed
Economic Evaluation of Options
Select Remedial Option
Agreement with Stakeholders, Internal and External
Assemble Project Team
Coordinate with Municipality, Utilities, Residents and Neighbours
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11DOC ID© Chevron 2005
REMEDIATION
Underpinning and Shoring
Piles and grade beams installed on 4 homes
One home demolished
Excavation
Removed all backyard improvements
Removed soil from backyards and under homes
Barrier Wall Installation
45m by 5.5m organic reactive barrier wall installed on retail station property line
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12DOC ID© Chevron 2005
UNDERPINNING AND SHORING
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13DOC ID© Chevron 2005
UNDERPINNING AND SHORING
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14DOC ID© Chevron 2005
UNDERPINNING AND SHORING
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15DOC ID© Chevron 2005
UNDERPINNING AND SHORING
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16DOC ID© Chevron 2005
UNDERPINNING AND SHORING
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17DOC ID© Chevron 2005
UNDERPINNING AND SHORING
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18DOC ID© Chevron 2005
EXCAVATION LIMITS
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19DOC ID© Chevron 2005
EXCAVATION
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20DOC ID© Chevron 2005
EXCAVATION
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21DOC ID© Chevron 2005
EXCAVATION
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22DOC ID© Chevron 2005
EXCAVATION
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23DOC ID© Chevron 2005
EXCAVATION
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24DOC ID© Chevron 2005
EXCAVATION
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25DOC ID© Chevron 2005
EXCAVATION
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26DOC ID© Chevron 2005
EXCAVATION
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27DOC ID© Chevron 2005
BARRIER WALL DESIGN
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28DOC ID© Chevron 2005
BARRIER WALL MODEL
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29DOC ID© Chevron 2005
BARRIER WALL INSTALLATION
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30DOC ID© Chevron 2005
BARRIER WALL INSTALLATION
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31DOC ID© Chevron 2005
BARRIER WALL INSTALLATION
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32DOC ID© Chevron 2005
BARRIER WALL INSTALLATION
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33DOC ID© Chevron 2005
BARRIER WALL INSTALLATION
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34DOC ID© Chevron 2005
POST REMEDIATION ACTIVITIES
Install Post Remediation Confirmatory Wells
Reinstate Structures (eg. floor slabs)
Reinstate Rear Yards, Fences, Garages
Reconnect Utilities
Performance Monitoring of Barrier Wall
Preparing Closure Reports for Certificates of Compliance on Off-Site Properties
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35DOC ID© Chevron 2005
PROJECT PARTICIPANTS
Chevron Canada Limited (Environment, Public and Government Affairs, Legal, and Engineering)
Keystone Environmental Ltd. (Environmental and Contract Administrator)
Hazco Environmental Services Ltd. (Remediation Contractor)
City of Burnaby (Engineering, Planning, Traffic)
GeoPacific Consultant Ltd. (Geotechnical)
Sommerset Engineering Group (Structural)
PLUS several other sub-contractors
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36DOC ID© Chevron 2005
CONCLUDING REMARK
Treat project as an investment, not an expense
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37DOC ID© Chevron 2005
THANK YOU