Environmental Management Plan Slope Stabilization Project Canada - - PowerPoint PPT Presentation

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Aug 28, 2023 116 likes •289 views

Environmental Management Plan Slope Stabilization Project Canada Post Corporation Saint John Mail Processing Plant Rob Fiander, P.Eng., Stantec Consulting Ltd. April 2016 Agenda 1 Project Description 2 Project Setting 3 Objectives and Risks 4

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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

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Agenda

1 Project Description 2 Project Setting 3 Objectives and Risks 4 Strategies 5 Conclusions

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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

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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 G a r a g e

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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

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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

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3 Objectives and Risks Risks Disruption of plant

perations

Damage to Waterloo Barrier sheet pile cut-off wall Release of contamination Unforeseen conditions or upsets Management Objectives Maintain continuity in mail

perations

Maintain function and access to Waterloo Barrier sheet pile cut-off wall

Mitigate risks

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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

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4 Strategies Safety and access controls Vehicle movements Staging / decontamination areas Work fence screening

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4 Strategies Design of rip rap slope Hydraulic design Slope stability Rip rap protection Soil liner Toe drain

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Waste Management Plan Waste streams Soil sampling and testing program Waste soil classifications ~ 9300 MT 4 Strategies

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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

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4 Strategies Environmental Monitoring Plan Air monitoring Surface water monitoring Groundwater monitoring

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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)

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4 Strategies Surface Water Monitoring Water level data-logging Upstream and downstream chemistry (4) Groundwater Monitoring Waterloo Barrier groundwater drainage chemistry

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5 Conclusions Waste Management Plan = cost savings Environmental Protection Plan = protection Monitoring = limited, if any impact

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