Green Remediation of a 20.6 hectare Site Greenwich Mohawk

Green Remediation of a 20.6 hectare Site
Greenwich Mohawk Brownfield
Brantford, Ontario
April 2016
Outline
• Background
• Environmental Site Assessment (Phase Two ESA)
• Remedial Design
• Full Scale Remedial Design
• Consultation
• Lessons Learned
2
Brantford History
•  By the early 1900s, Bran0ord was Canada’s 3rd largest exporter of manufactured goods A
•  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 3
B
Greenwich Mohawk Brownfield Properties
Brantford, ON
347 Greenwich Street (11.3 ha)
A
B
22 Mohawk Street (3.0 ha)
4
66 Mohawk Street (6.3 ha)
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
5
Editorial Cartoon-April 5
By Dave McCreary
Environmental Site Assessment, Pilot Studies,
Remedial Option Evaluation (2013 to 2014)
! 
6
! 
! 
Subsurface investigation (400+ sampling
locations)
Contamination in soil & groundwater
LNAPL – not highly mobile
Contaminant Extent – Preliminary Remedial Cost
Estimate, Traditional Dig and Dump Approach
7
Cost to Remediate to Generic Standards: $210,000,000 (Class 5 Est.)
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
8
Remedial Design Preliminary Risk Assessment Activities
Establish Reasonable Remedial Targets
Max Soil (µg/g) Loca%on 22 Mohawk Lead Petroleum Hydrocarbons F1 (minus BTEX) Petroleum Hydrocarbons F2 (C10-­‐C16) (max) Petroleum Hydrocarbons F3 (C16-­‐C34) (max) Xylenes, total 66 Mohawk Petroleum Hydrocarbons F1 (minus BTEX) Petroleum Hydrocarbons F2 (C10-­‐C16) (max) Petroleum Hydrocarbons F3 (C16-­‐C34) (max) Petroleum Hydrocarbons F4 (C34-­‐C50) Xylenes, total Total PCBs 347 Greenwich Lead Petroleum Hydrocarbons F1 (minus BTEX) Petroleum Hydrocarbons F2 (C10-­‐C16) (max) Petroleum Hydrocarbons F3 (C16-­‐C34) (max) Xylenes, total 9
144,709 4,800 22,700 12,100 8,640 4,000* 12,000 43,000 58,000 6,810 50.4 5,960 8,000 15,000 11,000 10,400 MOE Table 3 Soil Soil Remedia%on Max Standards Target Groundwater (ug/g) (µg/g) (µg/L) 120 55 98 300 3.1 55 98 300 2800 3.1 0.35 120 55 98 300 3.1 5,000 1,700 2,700 5,800 2,300 1,700 2,700 5,800 6,900 2,300 50 5,000 1,700 2,700 5,800 2,300 N/A 25,000 11,000 8,300 48,000 10,000** 25,700 61,700 4,000 69,600 N/A N/A 26,000 280,000 230,000 120,000 MOE Table 3 Groundwater Standards (ug/L) Groundwater Remedia%on Target (µg/L) 25 750 150 500 4200 750 150 500 500 4200 7.8 25 750 150 500 4200 N/A 1,900 500 N/A 53,000 1,900 500 N/A N/A 53,000 N/A N/A 1,900 500 N/A 53,000 Remedial Design Desktop Remedial Options Analysis;
including cost opinions (Class 5)
Long List of Technologies Soil Remediation Technologies EX SITU
• 
• 
• 
• 
• 
• 
Groundwater Remediation Technologies $210,000,000
Excavation and disposal
Solid-phase and slurry-phase bioremediation
Thermal desorption
Stabilization
Biological
$30,000,000
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
10
$40,000,000
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 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
11
Full Scale Approach
EXCAVATION AND
SEGREGATION
SOIL SCREENING
Coarse Material
Washed For
On-site Reuse
!  Overburden for On-site Reuse
!  Oil/LNAPL Recovered for Offsite Reuse
!  Concrete for On-site Reuse
12
!  On Site Water Treatment
!  Disposal to Sanitary
Sewer
!  Bioremediation/Soil
Washing for On-site
Soil Reuse
Full Scale Remedia@on (2015 to 2016) 13
Aerial View of Site During Remedia@on 14
Conceptual Contaminant Profile
Rubble
Rubble
Fill Material: Mixed soil with some
•  Iron debris
•  Cinders
•  Bricks & Blocks
•  Metals (lead, zinc, etc.)
Concrete Slab
Fill (5 feet
thick)
Oil/Solvent
Impacted Soil
Sand
Groundwater
2 to 10 feet thick
"  Oils/Solvent (xylene)
Oil/LNAPL layer
Clay
15
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
Off-site Disposal
(75,000 tonnes)
AS OF DECEMBER 2015, PROJECT IS 80% COMPLETE 16
Consultation
City Of Brantford
MOECC & Brant
County Health
Dept.
Public
CH2M
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 18
Proposal to Provide Environmental Site Assessment — West Village
Copyright 2015 by CH2M • Company Confidential
Questions?