Esquimalt Graving Dock Waterlot Sediment Remediation Phase 1B - - PowerPoint PPT Presentation

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Esquimalt Graving Dock Waterlot Sediment Remediation Phase 1B - - PowerPoint PPT Presentation

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Esquimalt Graving Dock Waterlot Sediment Remediation Phase 1B Open-Water Dredging Presenters: Tim Smiley Tervita - Project Manager Water Solu:ons, Environmental Services Kris:en

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SLIDE 1

Presenters: ¡ Tim ¡Smiley ¡– ¡Tervita ¡-­‑ ¡Project ¡Manager ¡– ¡Water ¡Solu:ons, ¡Environmental ¡Services ¡ Kris:en ¡Seabloom ¡– ¡Fraser ¡River ¡Pile ¡and ¡Dredge ¡(GP) ¡Inc ¡-­‑ ¡Senior ¡Project ¡Manager ¡ RPIC ¡OIawa ¡– ¡April ¡14-­‑16, ¡2014 ¡

Esquimalt Graving Dock Waterlot Sediment Remediation Phase 1B Open-Water Dredging

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SLIDE 2

Introduction

Esquimalt Graving Dock (EGD)

  • South Western tip of Vancouver

Island, Esquimalt BC

  • PWGSC owned and operated since

1927 (constructed 1921-1926)

  • “open-access” multi-user facility
  • Largest deep-sea shipbuilding

and repair facility on Canada’s Pacific coast

  • Accommodate “Panamax” size

vessels

  • Phase 1B Project – 9.7 Ha

April 15, 2014 | Slide 2 of 20

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SLIDE 3

Introduction

EGD Waterlot Remediation Phase 1B – Open-Water Dredging

  • 37 million dollar contract to

Tervita via competitive tender

  • FRPD – major marine

subcontractor

  • Project at a glance:
  • 150,000 m3 open-water

dredging, transportation, disposal

  • Structure demolition and

reinstatement

  • Slope protection
  • Residual management cover

April 15, 2014 | Slide 3 of 20

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SLIDE 4

Administration & Contract Management

  • Major Submittals Prior to

Mobilization

  • Construction Work Plan
  • Environmental Protection

Plan

  • Quality Control Plan
  • Health and Safety Plan
  • Complete construction

schedule

  • Ongoing Submittals
  • Daily/Weekly Reports
  • Daily Multi-Beam

Hydrographic Survey

  • Weekly progress meetings
  • 300+ Request for

Information

  • 300+ Advisories
  • Approximately 10 change
  • rders
  • Monthly progress billing
  • Updated schedule

April 15, 2014 | Slide 4 of 20

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SLIDE 5

Structural Demolition, Reinstatement & Slope Protection

  • Removal (Demolition)

and Reinstatement of:

  • Timber dock fender

system

  • Marina floats,

breakwater structure

  • Various site floats
  • Slope Protection
  • Slope filter layer
  • Slope armour layer

April 15, 2014 | Slide 5 of 20

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SLIDE 6

Operation of Active Drydock Facility

  • Completion of zones to

meet EGD operations EGD booking schedule

  • Working without

interrupting an active dry-dock facility

  • Adapting to a changing

schedule

  • Ongoing coordination and

communication with EGD

  • perations
  • Requirement to leave

50% of the South Jetty and North Landing Wharf for EGD operations use

April 15, 2014 | Slide 6 of 20

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SLIDE 7

Dredging by Sequence

  • Sequential design to work

zone by zone

  • Work two marine derricks

concurrently while maintaining the sequential order

  • Adapt sequence as

required to meet EGD

  • perational requirements
  • Comply with DFO permit

and restrictions on particular zones

  • CFSA Marina protection

April 15, 2014 | Slide 7 of 20

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SLIDE 8

Types of Dredging at EGD

  • Land based excavators –

4,000 m3

  • Mechanical dredging with

a clamshell - 145,000 m3

  • Diver assisted suction

dredging for sensitive structures – 50 m3

April 15, 2014 | Slide 8 of 20

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SLIDE 9

Marine Derrick and Bucket Positioning

  • Real Time Kinetic

(RTK) Receivers

  • Crane and Barge

Positioning (Qinsy)

  • Electronic depth

control via line counters (first time for FRPD)

  • Surface updated

daily from multi- beam survey and continuous from derrick software

April 15, 2014 | Slide 9 of 20

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SLIDE 10

Water Quality Concerns and Mitigations

  • Silt curtains (7m deep)
  • Sealed material barges
  • No passive dewatering
  • Bucket cycle times varied

as required

  • Level cut environmental

clamshell bucket (contractor choice)

  • Contractor supplied

environmental monitor QC

  • Full time PWGSC water

quality monitoring consultant QA

April 15, 2014 | Slide 10 of 20

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SLIDE 11

Barging Logistics

  • Transporting

contaminated soil

  • Authorization by Victoria

Harbour Master and Queens Harbour Master (Esquimalt)

  • Inclement weather

conditions (wind/waves/ fog)

  • Move to Plumper Bay

mid way through the project

April 15, 2014 | Slide 11 of 20

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SLIDE 12

Water Resources

Transfer

  • Water management:
  • 250m3 high turbidity water

per barge

  • Lock block wall wrapped in

filter cloth

  • Challenges:
  • Debris
  • Sludge
  • Thixotropic material
  • Solution
  • Gabion wall
  • Slurry and Vacuum Trailer

April 15, 2014 | Slide 12 of 20

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SLIDE 13

Water Resources

Treatment

  • Water Barges:
  • 2 Identical equipment

setups on similar barges

  • Water Storage:
  • 500m3 on deck
  • 1,100m3 below deck
  • Treatment:
  • Average throughput 20L/

sec

April 15, 2014 | Slide 13 of 20

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SLIDE 14

Water Resources

Discharge & QA/QC

  • Water Discharge:
  • Requirement: 40mg/L

suspended solids or less (20 NTU)

  • Actual: 2 NTU Average
  • Automated discharge

and recirculation valves

  • QA/QC
  • Discharge based on

inline turbidity analyzer

  • Regular laboratory

verification

April 15, 2014 | Slide 14 of 20

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SLIDE 15

Offloading

  • Offload Barge
  • 2 Excavators
  • Spill tray
  • Loader on dredgeate

barge

  • Challenges
  • High moisture content
  • Thixotropic material
  • Response
  • Various amendments

(wood pellets & cement)

  • Minimize agitation

April 15, 2014 | Slide 15 of 20

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SLIDE 16

Offloading

Off-Load Facility and Trucks

  • Loading trucks
  • 2 truck and pups at a

time

  • Average of 110 trips per

day

  • Containment
  • Sealed end gates
  • Hog fuel
  • Wheel wash
  • Regular monitoring
  • Storm water control

berms

April 15, 2014 | Slide 16 of 20

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SLIDE 17

Upland Transportation

  • Route Planning
  • Lane closure permits
  • Trucking routes
  • Community

communications

  • Monitoring
  • Challenges
  • Craigflower Bridge closure

(construction)

  • Lane closure restrictions
  • Stakeholder management

April 15, 2014 | Slide 17 of 20

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SLIDE 18

Disposal Facility and Logistics

  • Truck Traffic
  • Long turnaround times
  • Scale congestion
  • Road cleaning
  • Solution
  • Dedicated scale (80% of

daily traffic from EGD)

  • Expanded the receiving/

dumping area

  • Installed a wheel wash

and manual cleaning area

April 15, 2014 | Slide 18 of 20

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SLIDE 19

Residual Management Cover Placement

  • Fraser River washed

sand, loaded onto barges and shipped to site

  • Place sand layer
  • 0.3m to 0.6m thick
  • 75,000m2 foot print
  • With clamshell bucket on

grid pattern

  • Utilized bucket

positioning to track progress

  • Completed during

January to early March (weather)

April 15, 2014 | Slide 19 of 20

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SLIDE 20
  • Project complete:
  • Under budget
  • Ahead of schedule

(aggressive)

  • Minimal impact to
  • perations and tenants of

the Esquimalt Graving Dock

  • Successful environmental

cleanup

  • Questions??

Photo credits in this presentation to: Heath Moffatt Joe Pursley Tervita, FRPD and PWGSC staff

Conclusion

Esquimalt Graving Dock Waterlot Sediment Remediation Phase 1B Open-Water Dredging

April 15, 2014 | Slide 20 of 20