environmental management plan slope stabilization project · 3 objectives and risks sheet pile...
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Rob Fiander, P.Eng., Stantec Consulting Ltd.
April 2016
Environmental Management Plan Slope Stabilization Project Canada Post Corporation Saint John Mail Processing Plant
Failure of timber crib retaining wall Wall ~ 250 m in length and 3.5 m in height Options analysis: Rip Rap Slope Removal of creosoted timbers, soil backfill, and construction of slope 2013 - 2014
1 Project Description
2 Project Setting
Saint John Mail Processing Plant (early 1970s – present) Urban setting Operations include plant, garage and vehicle loading Former location of sawmill, lumber yard and creosote wood treatment facility Contamination from historical use
Plant
Marsh Creek Crib Wall
Garage
2 Project Setting
Creosote contamination identified in 1996 Options analysis: Waterloo Barrier sheet pile cut-off wall installed in 1998-1999
Plant
Marsh Creek
Waterloo Barrier
Garage
Creosote Plume
2 Project Setting
Creosote contamination found in 1996 Options analysis: Waterloo Barrier sheet pile cut-off wall installed in 1998-1999 WB sheet pile cut-off wall includes groundwater drainage system and recovery wells Groundwater monitoring and recovery ongoing
3 Objectives and Risks
Risks ! Disruption of plant
operations ! Damage to Waterloo Barrier
sheet pile cut-off wall ! Release of contamination ! Unforeseen conditions or
upsets
Management Objectives ! Maintain continuity in mail
operations ! Maintain function and access
to Waterloo Barrier sheet pile cut-off wall
• Mitigate risks
4 Strategies
Strategies ! Safety and access controls ! Design of rip rap slope ! Waste Management Plan ! Environmental Protection Plan ! Environmental Monitoring Plan (Air
Monitoring Protocol) ! Construction oversight
4 Strategies
Safety and access controls
! Vehicle movements ! Staging / decontamination areas ! Work fence screening
4 Strategies
Design of rip rap slope
! Hydraulic design ! Slope stability ! Rip rap protection ! Soil liner ! Toe drain
Waste Management Plan ! Waste streams ! Soil sampling and testing
program ! Waste soil classifications ! ~ 9300 MT
4 Strategies
Environmental Protection Plan Procedures ! Erosion and siltation controls ! Equipment decontamination ! Creosote timbers and
excavation management ! Vapour, dust and particulate
management ! Dewatering and groundwater
management ! Waste management
4 Strategies
4 Strategies
Environmental Monitoring Plan
! Air monitoring ! Surface water monitoring ! Groundwater monitoring
4 Strategies
Air Monitoring ! On-site: Construction
zone and Plant (5) ! Off-site: 10 locations ! Point (real time) surveys
(Benzene, TVOC, PM) ! Sample collection
(Benzene, VOC, PAH, PM, metals, CTPV, SPL)
4 Strategies
Surface Water Monitoring ! Water level data-logging ! Upstream and
downstream chemistry (4) Groundwater Monitoring ! Waterloo Barrier
groundwater drainage chemistry
5 Conclusions
! Waste Management Plan = cost savings ! Environmental Protection Plan = protection ! Monitoring = limited, if any impact
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