case study: successful remediation of operating service ... · remediation of operating service...
TRANSCRIPT
![Page 1: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/1.jpg)
Case Study: Successful Remediation of Operating Service Station and Third-Party Properties
at a National Park Townsite
Rob Micklethwaite and Elwyn Lyons
O’Connor Associates Environmental Inc.October 15, 2009
![Page 2: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/2.jpg)
Key Points for Success
• Importance of Communication with ALL Stakeholders
• Understanding Stakeholder’s Needs for their Decision-making
• Flexible Remediation Strategy
![Page 3: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/3.jpg)
![Page 4: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/4.jpg)
Looking east from near the west property line
![Page 5: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/5.jpg)
• Parks Canada directive in 1998 to have the tank/fuel systems upgraded to meet Federal Regulations
• Client was looking to remove service bays from the building and replace with a convenience store
• Town was looking for the site redevelopment to meet their architectural controls, to change the adjacent intersection layout and locations of some of their utilities
![Page 6: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/6.jpg)
• Lithology is alluvial sand and gravel with interbedded silt units
• Depth to groundwater at ~3 m bgs
![Page 7: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/7.jpg)
![Page 8: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/8.jpg)
![Page 9: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/9.jpg)
• Start with a Conceptual Model- Quantitatively describe contaminant
sources and migration mechanisms related to exposure pathways and receptors
• Develop risk management criteria
![Page 10: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/10.jpg)
• Typically the industry practice for upgrading service stations is to clean up the site only as necessary to complete the upgrade
• Full remediation completed at site closure
![Page 11: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/11.jpg)
• Parks Canada was under pressure to uphold National Parks as pristine environments (even townsites)
• Park is UNESCO World Heritage site
• Risk management was not acceptable
• Site needed to be “clean”
![Page 12: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/12.jpg)
• Parks Canada required stringent CCME criteria to be met- residential / parkland criteria for soil
- freshwater aquatic life criteria for groundwater
![Page 13: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/13.jpg)
• Required Extensive Suite of Chemical Analyses: VOCs (BTEX), PAHs, phenolic compounds, lead, petroleum hydrocarbon fractions
• Contaminants of Concern: - Soil: BTEX, PHC F1 – F4, PAHs
(naphthalene and pyrene)
- GW: BTEX, PHC F1, F2, lead?, PAHs?
![Page 14: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/14.jpg)
• Capital Projects (Facility Upgrades) versus Environmental Projects (Site Closure)
• Early and frequent discussions with All Stakeholders about the project objectives
• Discussion with Parks Canada of applicability for very stringent remediation criteria and how this related to risk
![Page 15: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/15.jpg)
Remediating Federal Contaminated Sites
Fully delineate
Develop a full remediation strategy
Receive approval before implementation
![Page 16: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/16.jpg)
For this site.......Offsite delineation drilling had started but not completed
Comprehensive remedial action plan was not possible
![Page 17: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/17.jpg)
Agreement amongst Stakeholders that onsite remediation could be separated from the offsite remediation
The Client put up a (nominal) security bond for offsite remediation to satisfy concerns from Parks Canada
![Page 18: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/18.jpg)
Excavation wasn’t going to be easy!• Sandy soils in the saturated zone
• High hydraulic conductivity – pumping rate of 1600 L/min to reduce water table to the required depth of the new tank nest at 4.6 m bgs
• Limited disposal options for water – sanitary sewer: restriction of 600 L/min
• Groundwater Modelling predicted that shoring would be successful for tank installation
![Page 19: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/19.jpg)
• Identified to Stakeholders that it wasn’t logistically possible to shore the complete site – only the new tank nest
• Required by Parks Canada to establish a “clean” tank nest base before new tanks could be installed
![Page 20: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/20.jpg)
• How deep does the contamination go?
• How deep should the shoring go?
• How much flexibility can we build into the design if we have to go beyond 4.6 m bgs?
![Page 21: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/21.jpg)
Sheet Piling
![Page 22: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/22.jpg)
Dewatering of the tank nest
Dewatering point
![Page 23: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/23.jpg)
• used a mobile laboratory to establish “clean” base so Parks Canada could approve installation of new tanks
• deepest point of excavation was 4.8 m bgs, consistent with expectations
• 1600 m3 of petroleum hydrocarbon impacted soil removed outside the park boundary
![Page 24: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/24.jpg)
• 1700 m3 of groundwater was treated using GAC and discharged to sanitary sewer
• Maximum flow rate of 180 L/min and average of 74 L/min (<<600 L/min), consistent with Groundwater Modelling predictions
![Page 25: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/25.jpg)
New tanks in the ground!
![Page 26: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/26.jpg)
Extraction of Sheet Piling
![Page 27: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/27.jpg)
Excavation beneath building
Vapour Management System
![Page 28: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/28.jpg)
1 of 2 abandoned tanks found near pump island
![Page 29: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/29.jpg)
2 abandoned tanks near west property line
![Page 30: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/30.jpg)
![Page 31: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/31.jpg)
Pump Island excavation
• outside the shoring, confirmed excavation below the water table for soil remediation not possible
• backfilling required filter cloth followed by wash rock and pitrun gravel
![Page 32: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/32.jpg)
Soil Vapour Extraction/Groundwater Aeration
Piping north of new pump islandsPiping near south property line and west of building
![Page 33: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/33.jpg)
![Page 34: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/34.jpg)
• Piping installed but system not to be operational until approved
• Updated the 1999 Environmental Screening Report / Remedial Action Plan in 2002 with insitu remediation options for outside of the tank nest
- Soil Vapour Extraction/Groundwater Aeration
- Enhanced Bioremediation using Oxygen Releasing Compounds
![Page 35: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/35.jpg)
• Soil Vapour Extraction (with Groundwater Aeration) – effective in the first year then extraction rate was very low
• Groundwater Aeration – effective in the second and third year to enhance bioremediation
• SVE/GA successfully remediated the onsite contaminated soils and groundwater to meet the CCME criteria
![Page 36: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/36.jpg)
Offsite Assessment
Third Party Building
![Page 37: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/37.jpg)
• SVE/GA designed for piping to be installed on third-party property
• SVE/GA: insitu bioremediation contribution was going to be more effective than the aeration and vapour extraction contribution
• Enhanced Bioremediation using Oxygen Releasing Compounds
– Pilot Study on third-party property before extending onto roadway
![Page 38: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/38.jpg)
Enhanced Bioremediation
![Page 39: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/39.jpg)
![Page 40: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/40.jpg)
![Page 41: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/41.jpg)
Learnings
• Remediation – Technical Challenges
• Importance of communication with AllStakeholders about Project Objectives and Uncertainties
• Understanding the needs of the Stakeholders for their decision making
![Page 42: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/42.jpg)
Learnings / Take Aways
• Make it easier to get Buy-In from Regulatory Agency- compile chemical data into easy-to-read
format that relates contamination to site features
![Page 43: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/43.jpg)
Learnings / Take Aways• Discuss the Conceptual Model with Client and
Regulatory Agency - Know your Endpoints!- Understanding the CCME criteria and the
significance of changing criteria (e.g. less stringent 2004 benzene criterion in soil adopted)
- Reduced suite of chemical analyses
- Reduced frequency of monitoring and sampling programs
- Allowances for increased timeframes for remediation
![Page 44: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/44.jpg)
Learnings / Take Aways• Continuous communication with ALL Stakeholders
• Historical Review may not be complete even with best efforts during the Phase 1 Investigation
• Use low-flow groundwater sampling to meet stringent CCME criteria
• Consider a security bond?.....to allow flexibility with remediation program; assurance that work will continue
• Best to have a Remediation Strategy that is not focussed on one option but can respond to changes in conditions or the lifecycle of the property
![Page 45: Case Study: Successful Remediation of Operating Service ... · Remediation of Operating Service Station and Third-Party Properties ... Groundwater Modelling predicted that ... Piping](https://reader033.vdocument.in/reader033/viewer/2022051802/5afbf6207f8b9aa34d8b849a/html5/thumbnails/45.jpg)
Thank You