environmental management plan slope stabilization project · 3 objectives and risks sheet pile...
TRANSCRIPT
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