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Emma Kirsh, P.Geol. Jason Pentland, M.Sc., P.Eng. SLR Consulting (Canada) Ltd.
Dust Suppressant Impacts During Pipeline Construction –
Implementation of a RMP and MNA Program in Jasper National Park
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Introduction
• Kinder Morgan Canada completed pipeline expansion and construction activities at two yards north of the Jasper transfer station in 2007/2008
• Main Yard & Staging area lease from Parks Canada, cleared, and used for construction/equipment lay down areas
• Dust suppressant application in 2007
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2008
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Contaminant of Concern
• CaCl2 - Dust suppressant • ~31,000 L of brine solution at 32%
– 27-28% CaCl2
– 3-4% NaCl & KCl
• Hygroscopic-attracts moisture
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Regulatory Framework • CCME applicable based on site within
National Park and NEB regulation of pipeline • Agricultural land use required by Parks
Canada to account for protection of flora and fauna
• Soil guidelines for EC (2 dS/m), SAR (5), pH (6-8)
• Groundwater guidelines for DW (250mg/L) and FWAL (230/120 mg/L)
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Initial 2009 Phase II ESA
• EC & SAR > CCME AG guidelines at Main Yard and Staging Area
• Max EC – 28.7 dS/m (background <1.0) • Max SAR – 14.4 (background <2.5) • Max chloride - 2,540 mg/kg (background
(10-30) • Estimated 16,000 m2 area impacted up to
maximum 1.5 m depth
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Risk Management Plan
• Conceptual site model • Contaminant transport model • Surface runoff control • Monitoring
– EM survey – Soil monitoring – Groundwater monitoring
• Reclamation
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Conceptual Site Model Precipitation
Sand & Gravel
Runoff
E-T
Hwy 16 Infiltration
Athabasca River
Impacted Soil
Potential DUA
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Contaminant Transport Modelling
• Objectives: – Model chloride behaviour in subsurface – Assess the mobility and behaviour of the
chloride impacts at the two sites – Estimate potential chloride concentrations at
the groundwater table in the future – Estimate the chloride concentrations in the
soil in the rooting zone (upper 1 m) with time as a surrogate for EC
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CT Modelling Methodology
• Used VS2DTI developed by USGS • Simulates fluid flow and solute transport in
saturated-unsaturated porous media using Richard’s Equation
• Adopted a 1-dimensional model domain assuming vertical flow through unsaturated zone
• Estimate of soil water characteristic curve developed for SLR by SoilVision Systems Ltd.
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Model Conclusions
• EC in upper 1 m predicted to decrease below 2 dS/m within 5 years
• Predicted maximum chloride concentration at water table was 70 mg/L based on most realistic model inputs
• Time for peak concentration at water table estimated to be greater than 17 years for all likely scenarios assessed
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Monitoring Program
• Objective to determine how well monitored natural attenuation is occurring
• Two methods used for temporal comparison to 2008-2009 initial results:
EM31 (5 m) /38 (1.5 m) survey – 2 more events Soil and groundwater chemistry - 3 more events Total of nine boreholes chosen for repeat
assessment based initial 2008 EM survey and 2009 soil chemistry
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Soil and Groundwater Monitoring
Soil
• Drilling locations chosen based on historic elevated soil chemistry and EM apparent conductivity
• 6 Borehole locations in Main Yard
• 3 Borehole locations in Staging Area
• Detailed salinity, 1:2 EC screening
Groundwater
• 8 wells in each of Main Yard and Staging Area for 2009-2011
• Reduced to 4 in each area for 2012 based on initial results confirming modelling results
• Wells already existing based on adjacent TMP pump station.
• Routine potability, Fe, Mn
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Consistency is key
EM31/38 • 2008, 2010 and 2011 on
both yards • Datasets were calibrated &
normalized with each set of previous result ranges to allow for a direct comparison of the temporal changes observed
• Based on decreases by 2011, was excluded from work in 2012
Soil Chemistry
• Direct push geoprobe rig used for accurate depth logging
• High accuracy GPS unit and borehole markers used to allow repeat drilling within 0.3 m radius of original borehole
• Timing of field work consistent each year
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EM 38 –Main Yard Progress
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EM38 –Staging Area Progress
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EM31 – Main Yard Progress
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EM31- Staging Area Progress
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Soil Evaluation
•Full borehole sampling length at each location for 1:2 EC screening •Subsequent results used for full detailed salinity analyses to confirm saturated paste EC values •Correlation of 1:2 EC and saturated paste results from over 100 sample points in both yards
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EC Correlation Use
• Create vertical soil profiles from full borehole length of 1:2 EC and saturated paste EC results
• Correlation of EC with chloride (R2=0.97) in the CTM report was indicative that the overall EC vertical soil can be used to comment on relative levels of chloride concentration changes over time
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0
100
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0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
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h be
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(cm
)
EC (dS/m)
Chart 2 Temporal Changes in EC Concentration and Depth - BH107
2009
2010
2011
2012
CCME Guideline
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0
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0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0
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h be
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(cm
)
EC (dS/m)
Chart 6 Temporal Changes in EC Concentration and Depth - BH128
2009
2010
2011
2012
CCME Guideline
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0
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0.0 2.0 4.0 6.0 8.0 10.0 12.0
Dept
h be
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(cm
)
EC (dS/m)
Chart 9 Temporal Changes in EC Concentration and Depth - BH211
2009
2010
2011
2012
CCME Guideline
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0
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Dept
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)
EC (dS/m)
Chart 10 Temporal Changes in EC Concentration and Depth - BH213
2009
2010
2011
2012
CCME Guideline
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Results Evaluation
•Initial CaCl2 concentrations unknown in 2007/2008 during application •2009 initial soil data assumed as time (T0=0) and concentration baseline (C0=1) •Comparison of Cyr/C0 used to evaluate peak EC concentration ratios at each borehole
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Reduction Success Main Yard Staging Area
• C2012/C0 ranged from 0.04 to 0.16
• Average of 0.12 indicated 88% reduction in average peak concentration
• Average peak EC depth increasing 2009 – 0.2 mbgs 2010 – 1.6 mbgs 2011 – 2.2 mbgs 2012 – 5.0 mbgs
• C2012/C0 ranged from 0.03 to 0.64
• Average of 0.23 indicated 77% reduction in average peak concentration
• Average peak EC depth increasing 2009 – 0.2 mbgs 2010 – 1.4 mbgs 2011 – 3.0 mbgs 2012 – 5.8 mbgs
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Results by end of 2012
• All EC, SAR and chloride concentrations below applicable criteria and derived target in upper rooting zone
• All soil in Staging Area meets criteria at all locations/depths
• EC, chloride targets above final criteria/targets at depths e 5.2 mbgs
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Groundwater Monitoring Program
• Results consistently demonstrated no change over 3 year monitoring period
• Maximum concentration observed during 3 year period was 29.7 mg/L with average 8.8 mg/L
• Peak concentrations expected to reach deep water table at >17 years for all model outcomes
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Reclamation Progress
KMC contractor implementing
steps for all sites as part of TMX Anchor Loop
2011: Native
seeding mix/weed
control
2012: Pine tree planting
2014: Fence
removed & access road reclaimed,
native encroachment
in progress
2015: Additional
tree & shrub
planting
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2010
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2011
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2012
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Future Steps
Soil
• Confirm attenuation of final locations at depth below applicable criteria
• Re-drill the locations in 2015
• Monitor vegetation for growth and signs of stress
Groundwater
• Carry on with monitoring of CTM modelling outcome at 3 year intervals to confirm peak values at water table
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Keys to Success
• RMP to guide process and allow 3rd party/stakeholder assurance
• KMC commitment • NEB & Parks Canada follow up/comments
up each annual report • Up to maximum ~22,000 m3 soil in
ecologically sensitive area left in place with no further disturbance
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Acknowledgements
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Questions?