Environmental Management Plan Slope Stabilization Project Canada - PowerPoint PPT Presentation

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 Strategies 5 Conclusions

1 Project Description 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

2 Project Setting Saint John Mail Processing Plant (early 1970s – present) Urban setting Marsh Creek Crib Wall Operations include plant, garage and vehicle loading e g a r a G Former location of sawmill, lumber yard and creosote Plant wood treatment facility Contamination from historical use

2 Project Setting Marsh Creek Creosote contamination Waterloo Barrier identified in 1996 Garage Options analysis: Waterloo Barrier sheet Creosote Plume pile cut-off wall installed in 1998-1999 Plant

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 Management Objectives Risks � Maintain continuity in mail � Disruption of plant operations operations � Damage to Waterloo Barrier � Maintain function and access sheet pile cut-off wall to Waterloo Barrier sheet pile � Release of contamination cut-off wall � Unforeseen conditions or • Mitigate risks upsets

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

4 Strategies 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 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