Rob Fiander, P.Eng., Stantec Consulting Ltd.

April 2016

Environmental Management Plan Slope Stabilization Project Canada Post Corporation Saint John Mail Processing Plant

Agenda

1 Project Description

2 Project Setting

3 Objectives and Risks

4 Strategies

5 Conclusions

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