Green Remediation of a 20.6 hectare Site Greenwich Mohawk ... · Full Scale Remediation Progress...
Transcript of Green Remediation of a 20.6 hectare Site Greenwich Mohawk ... · Full Scale Remediation Progress...
Green Remediation of a 20.6 hectare Site Greenwich Mohawk Brownfield Brantford, Ontario April 2016
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Outline • Background
• Environmental Site Assessment (Phase Two ESA)
• Remedial Design
• Full Scale Remedial Design
• Consultation
• Lessons Learned
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Brantford History • By the early 1900s, Bran0ord was Canada’s 3rd largest exporter of manufactured goods
• Dis@nguished companies: Massey Ferguson, CockshuE Plow Company, Verity Plow
• But by the 1980s/1990s, the buildings were in disuse and largely abandoned
• City stepped in and acquired the proper@es and has led the brownfield ini@a@ve to remediate and redevelop the site
• Funding: $12M Industry Canada; $5M Province of Ontario; City remainder with support from Green Municipal Fund
• Funding Driven Remedial Deadline -‐ December 31, 2016
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Greenwich Mohawk Brownfield Properties Brantford, ON
347 Greenwich Street (11.3 ha)
66 Mohawk Street (6.3 ha) 22 Mohawk Street (3.0 ha)
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Demolition (2010 to 2013) Removed: • Brantford had to remove barriers to
developing the site.
• Unsafe buildings were demolished; debris, combustible material and USTs were removed.
Retained: • Former office/warehouse and
timekeeper portico which are designated heritage buildings.
• Two buildings for Canadian Military Heritage Museum
Editorial Cartoon-April 5 By Dave McCreary
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Environmental Site Assessment, Pilot Studies, Remedial Option Evaluation (2013 to 2014)
! Subsurface investigation (400+ sampling locations)
! Contamination in soil & groundwater ! LNAPL – not highly mobile
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Contaminant Extent – Preliminary Remedial Cost Estimate, Traditional Dig and Dump Approach
Cost to Remediate to Generic Standards: $210,000,000 (Class 5 Est.)
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Remedial Design
Concurrent Activities 1. Preliminary Risk Assessment activities to identify
reasonable remedial targets
2. Desktop Remedial Options Analysis, including cost opinions
3. Pilot testing of preferred remedial options to establish site specific remedial design criteria
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Remedial Design - Preliminary Risk Assessment Activities Establish Reasonable Remedial Targets
Loca%on
Max Soil (µg/g)
MOE Table 3 Soil Standards (ug/g)
Soil Remedia%on Target (µg/g)
Max Groundwater
(µg/L)
MOE Table 3 Groundwater Standards (ug/L)
Groundwater Remedia%on
Target (µg/L)
22 Mohawk Lead 144,709 120 5,000 N/A 25 N/A Petroleum Hydrocarbons F1 (minus BTEX) 4,800 55 1,700 25,000 750 1,900 Petroleum Hydrocarbons F2 (C10-‐C16) (max) 22,700 98 2,700 11,000 150 500 Petroleum Hydrocarbons F3 (C16-‐C34) (max) 12,100 300 5,800 8,300 500 N/A Xylenes, total 8,640 3.1 2,300 48,000 4200 53,000 66 Mohawk Petroleum Hydrocarbons F1 (minus BTEX) 4,000* 55 1,700 10,000** 750 1,900 Petroleum Hydrocarbons F2 (C10-‐C16) (max) 12,000 98 2,700 25,700 150 500 Petroleum Hydrocarbons F3 (C16-‐C34) (max) 43,000 300 5,800 61,700 500 N/A Petroleum Hydrocarbons F4 (C34-‐C50) 58,000 2800 6,900 4,000 500 N/A Xylenes, total 6,810 3.1 2,300 69,600 4200 53,000 Total PCBs 50.4 0.35 50 N/A 7.8 N/A 347 Greenwich Lead 5,960 120 5,000 N/A 25 N/A Petroleum Hydrocarbons F1 (minus BTEX) 8,000 55 1,700 26,000 750 1,900 Petroleum Hydrocarbons F2 (C10-‐C16) (max) 15,000 98 2,700 280,000 150 500 Petroleum Hydrocarbons F3 (C16-‐C34) (max) 11,000 300 5,800 230,000 500 N/A Xylenes, total 10,400 3.1 2,300 120,000 4200 53,000
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Remedial Design - Desktop Remedial Options Analysis; including cost opinions (Class 5)
Long List of Technologies Soil Remediation Technologies Groundwater Remediation Technologies EX SITU • Excavation and disposal • Solid-phase and slurry-phase bioremediation • Thermal desorption • Stabilization • Biological • Soil washing
IN SITU • Physical/mechanical
- SVE - Dual-phase vacuum extraction - Stabilization - Soil flushing
• Biological - Bioventing - Phytoremediation
• Thermal - Electrical resistance heating - Thermal conductive heating - Steam-enhanced extraction
Physical/mechanical - AS/SVE - Pump-and-treat - NAPL recovery - Barrier walls - Groundwater circulation - Stabilization - Dual-phase vacuum extraction - Surfactant washing Chemical - Reactive barrier walls - ISCO and ISCR Biological - Bioslurping - Biobarriers - Biosparging - Natural attenuation - Phytoremediation Thermal - Electrical resistance heating - Thermal conductive heating - Steam-enhanced extraction
$210,000,000
$30,000,000
$40,000,000
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Remedial Design - Pilot Tests (2013 to 2014) Funded through Green Municipal Fund
Pilot Test Results Steam Enhanced Injection Effective but:
- Uncertainty regarding subsurface structures - time estimates beyond project deadline
Bioremediation/Soil Screening/ Washing/ NAPL Removal/ Air Sparging – Soil Vapour Extraction
Effective - Proven remedial options - Bioremediation – average 8 weeks processing time - Washing and screening – up to 50% volume reduction estimated
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Full Scale Approach EXCAVATION AND
SEGREGATION
! Overburden for On-site Reuse ! Oil/LNAPL Recovered for Off-
site Reuse ! Concrete for On-site Reuse
SOIL SCREENING
! On Site Water Treatment ! Disposal to Sanitary
Sewer
! Bioremediation/Soil Washing for On-site Soil Reuse
Coarse Material Washed For
On-site Reuse
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Full Scale Remedia@on (2015 to 2016)
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Aerial View of Site During Remedia@on
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Conceptual Contaminant Profile
Fill Material: Mixed soil with some • Iron debris • Cinders • Bricks & Blocks • Metals (lead, zinc, etc.)
Fill (5 feet thick)
Sand
Clay
Rubble Rubble
Concrete Slab
Groundwater 2 to 10 feet thick " Oils/Solvent (xylene)
Oil/Solvent Impacted Soil
Oil/LNAPL layer
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Full Scale Remediation Progress
Achievements Quantity Avoided
On-site Management Of Soil In-place (Material Handled)
1,000,000 m3 Treatment or Remediation (On-site or Off-site)
On-site Soil Treatment (Petroleum Hydrocarbon Impacted Soil)
110,000 m3 Off-site Disposal
LNAPL Recycling (Oil Recycled For Beneficial Use)
120,000 L Off-site Disposal
Reuse Of Building Foundations (Crushed Concrete As Fill Material)
30,000 m3
(75,000 tonnes) Off-site Disposal
AS OF DECEMBER 2015, PROJECT IS 80% COMPLETE
Consultation
City Of Brantford
Public
CH2M
MOECC & Brant County Health Dept.
18 Proposal to Provide Environmental Site Assessment — West Village Copyright 2015 by CH2M • Company Confidential
Lessons Learned Green Remedia@on Approaches = Risk Assessment Based Solu@ons = Cost Savings Cost Es@mate – Class 5 Cost Es@mate Useful for Budge@ng Purposes Brownfield Remedia@on Includes Uncertainty, Schedule Constraints a Challenge Odours Can be a Significant Management Challenge
Proac@ve Public Consulta@on Program – Team quickly learned that listening and having open communica@on channels with the public and other interest par@es was very important Ac@ve engagement with MOECC was cri@cal to success of the project
Questions?