City of Ottawa’s Lemieux Island City of Ottawa’s Lemieux Island

Transmission Main Replacement ProgramTransmission Main Replacement Program Low and High Pressure Transmission Low and High Pressure Transmission

MainsMains

City of Ottawa’s Lemieux Island City of Ottawa’s Lemieux Island

Transmission Main Replacement ProgramTransmission Main Replacement Program Low and High Pressure Transmission Low and High Pressure Transmission

MainsMains

by Mike Willmets, City of Ottawa

Derek Potvin, P.Eng., Robinson Consultants

2

Presentation OutlinePresentation Outline

Water Works HistoryWater Works History Existing ConditionsExisting Conditions ConstructionConstruction

3

Project LocationProject Location

4

Project OverviewProject Overview5 km of 1200, 1675, 1980 mm 5 km of 1200, 1675, 1980 mm diameter Transmission Maindiameter Transmission Main

5 km of 1200, 1675, 1980 mm 5 km of 1200, 1675, 1980 mm diameter Transmission Maindiameter Transmission Main

Serves 400,000 people Serves 400,000 people within City of Ottawa.within City of Ottawa.

Replaces three discharge Replaces three discharge mains from Purification mains from Purification Plant.Plant.

One of the Transmission One of the Transmission Mains operates as a low Mains operates as a low pressure (gravity) suction pressure (gravity) suction supply for a Fleet Street supply for a Fleet Street Pumping Station and the Pumping Station and the other operates at other operates at distribution system distribution system pressure.pressure.

5

Water Wagon – Pre Water Wagon – Pre 18741874

6

Why Supply Drinking Why Supply Drinking Water?Water?

Water delivered by horse & wagon in Water delivered by horse & wagon in wooden barrelswooden barrels

Era of Great Fires: Quebec City in Era of Great Fires: Quebec City in 1845, Montreal in 1852, Carleton 1845, Montreal in 1852, Carleton County in 1870, Chicago in 1871County in 1870, Chicago in 1871

Fire Insurance UnderwritersFire Insurance Underwriters Toronto - 1841, Kingston - 1850, Toronto - 1841, Kingston - 1850,

Hamilton - 1860Hamilton - 1860

7

Thomas Coltrin KeeferThomas Coltrin Keefer1821 - 19151821 - 1915

Father of the Ottawa Father of the Ottawa Water WorksWater Works

One of Canada’s One of Canada’s greatest engineersgreatest engineers

Built similar water Built similar water systems in Montreal, systems in Montreal, Hamilton & TorontoHamilton & Toronto

8

Harnessing Harnessing the the

Chaudiere Chaudiere FallsFalls

9

Fleet Street Pumping Fleet Street Pumping StationStation

Commissioned 1874Commissioned 1874

Utilizing hydraulic Utilizing hydraulic energy of Chaudiere energy of Chaudiere FallsFalls

765m open aqueduct 765m open aqueduct builtbuilt

Capital Cost of $266,000Capital Cost of $266,000

10

Ottawa Fire Brigade 1874Ottawa Fire Brigade 1874

11

Great Fire Great Fire of Ottawa-of Ottawa-Hull 1900Hull 1900

12

Ottawa’s Great Fire - Ottawa’s Great Fire - 19001900

13

Typhoid Epidemics Typhoid Epidemics

1 epidemic in 1911, 2 epidemics in 19121 epidemic in 1911, 2 epidemics in 1912 1900 to 1915 - 512 related deaths1900 to 1915 - 512 related deaths 1916 to 1925 - 18 related deaths1916 to 1925 - 18 related deaths Nepean Bay pollution Nepean Bay pollution

14

Three of the most important Three of the most important mainsmains

Critical to operation of systemCritical to operation of system Unique Pipes in a Unique Unique Pipes in a Unique

SettingSetting

Fleet P.S.

Lemieux WPP

ABC LinesABC Lines

15

Lock Bar PipeLock Bar Pipe

Two semi-circular sections joined by a ‘lock bar’ Lock bar is long strip of metal with an ‘H’ shaped

cross section Riveted joints to join pipe to pipe

16

Delivery of “A” Line Piping Delivery of “A” Line Piping 19151915

17

““C” Line Construction 1937 - C” Line Construction 1937 - 5050

18

Existing Pipe ConditionExisting Pipe Condition

Corrosion pitting leads to Corrosion pitting leads to leakage.leakage.

Corrosion of rivets & lock bar Corrosion of rivets & lock bar can lead to pipe failure.can lead to pipe failure.

““A” & “B” Line’s cement lining A” & “B” Line’s cement lining (circa 1950) was delaminating (circa 1950) was delaminating which accelerated internal which accelerated internal corrosion.corrosion.

““C” Line was in good condition C” Line was in good condition but required relocation for but required relocation for planned development.planned development.

19

Site ConstraintsSite Constraints

Federal LandFederal Land

LeBreton Flats LeBreton Flats DevelopmentDevelopment

Past Land UsesPast Land Uses

Breezehill/Scott Breezehill/Scott FeedermainsFeedermains

Subsurface Subsurface ConditionsConditions

20

Existing Site ConditionsExisting Site Conditions Adjacent to former Municipal Waste Site » Contaminated Soils and Adjacent to former Municipal Waste Site » Contaminated Soils and

Groundwater » Highly Corrosive Environment.Groundwater » Highly Corrosive Environment.

Area formerly part of Ottawa River » Significant area of unconsolidated fill Area formerly part of Ottawa River » Significant area of unconsolidated fill material.material.

Adjacent to Ottawa River » Dewatering issue during construction.Adjacent to Ottawa River » Dewatering issue during construction.

Area formerly an industrial development » Subsurface remnants and Area formerly an industrial development » Subsurface remnants and contamination.contamination.

Crossing major Crossing major transportation corridors transportation corridors » Traffic Implications.» Traffic Implications.

Construction within Construction within existing aqueduct existing aqueduct channel » Protection of channel » Protection of watermain.watermain.

Construction within Construction within existing AWWA existing AWWA Canadian Waterworks Canadian Waterworks Landmark and Heritage Landmark and Heritage Structure » Fleet Street Structure » Fleet Street Pumping Station.Pumping Station.

Lemieux Island WPPLemieux Island WPP

Fleet Street Fleet Street Pumping StationPumping Station

21

Historical Historical Land UsesLand Uses

22

Subsurface ConditionsSubsurface Conditions

High Pressure Transmission Main

Albert Street

Wellington Street

Bayview Yards

Lemieux Island WPP

Nepean Bay

Low Pressure WM

23

Geotechnical ConditionsGeotechnical Conditions

Unconsolidated fill from Nepean Bay and Ottawa River Unconsolidated fill from Nepean Bay and Ottawa River Parkway over bedrockParkway over bedrock

Long term settlement concerns and significant dewateringLong term settlement concerns and significant dewatering

24

Dynamic CompactionDynamic Compaction Large Un-consolidated Fill Zone on reclaimed land » former Large Un-consolidated Fill Zone on reclaimed land » former

bay of the Ottawa River.bay of the Ottawa River.

Dynamic Compaction used to prepare watermain alignment Dynamic Compaction used to prepare watermain alignment prior to construction.prior to construction.

Large steel weight dropped from crane to achieve Large steel weight dropped from crane to achieve consolidation.consolidation.

Compaction can be achieved Compaction can be achieved to over 10m depth.to over 10m depth.

Compaction carried out using Compaction carried out using grid pattern to cover area.grid pattern to cover area.

Compaction testing carried out Compaction testing carried out after completion.after completion.

25

Corrosion Potential InvestigationCorrosion Potential Investigation

26

Preferred AlignmentPreferred Alignment

27

Design RequirementsDesign Requirements 100 Year Design Life Required.100 Year Design Life Required.

Must maintain water supply to Must maintain water supply to customers.customers.

LPTM to serve dual purpose » Operate LPTM to serve dual purpose » Operate primarily at low pressure with conversion primarily at low pressure with conversion to high pressure based on demand.to high pressure based on demand.

HPTM to supply water to distribution HPTM to supply water to distribution system from pumping station at WPP.system from pumping station at WPP.

Must maintain access to existing Must maintain access to existing purification plant.purification plant.

Must protect existing heritage Must protect existing heritage structures » Fleet Street Pumping structures » Fleet Street Pumping Station and Open Aqueduct.Station and Open Aqueduct.

28

Watermain MaterialsWatermain Materials Concrete encased, polyurethane coated, Concrete encased, polyurethane coated,

steel pipe and concrete pressure pipe steel pipe and concrete pressure pipe utilized to protect against corrosion.utilized to protect against corrosion.

Gasketless, double lap welded, bell and Gasketless, double lap welded, bell and spigot joints specified to protect against spigot joints specified to protect against groundwater ingress in landfill zones.groundwater ingress in landfill zones.

Transition between material types at valve Transition between material types at valve chambers.chambers.

Cathodic protection installed throughout.Cathodic protection installed throughout.

29

Ruins from Previous Ruins from Previous Development Development

Previous railway structures, bridge abutments, building Previous railway structures, bridge abutments, building foundations and superstructure debris uncovered in the foundations and superstructure debris uncovered in the watermain excavations.watermain excavations.

Previous factory foundation and tunnel uncovered within the Previous factory foundation and tunnel uncovered within the excavations.excavations.

30

Concrete Concrete EncasementEncasement 150 mm concrete encasement

Pipe strapped to concrete slabs to counterbalance buoyancy

31

Open Aqueduct Open Aqueduct InstallationInstallation

Coated concrete pressure pipe installed in Coated concrete pressure pipe installed in existing open aqueduct channel.existing open aqueduct channel.

Channel is a “neighbourhood feature” and Channel is a “neighbourhood feature” and a designated heritage structure.a designated heritage structure.

High density polyethylene shield added to High density polyethylene shield added to protect watermain from objects falling or protect watermain from objects falling or being thrown into water.being thrown into water.

Gasketless expansion joints used between Gasketless expansion joints used between fixed supports to allow for temperature fixed supports to allow for temperature movements.movements.

32

Fleet Street Pumping Fleet Street Pumping StationStation

Existing AWWA Canadian Water Works Existing AWWA Canadian Water Works Landmark and heritage structure.Landmark and heritage structure.

Turbine pumps driven by water from Turbine pumps driven by water from Ottawa River » fed by aqueduct Ottawa River » fed by aqueduct system.system.

Connection of new transmission main Connection of new transmission main with valve chamber to switch to high with valve chamber to switch to high pressure operation » by-passes pressure operation » by-passes pumping station.pumping station.

Included replacement of existing Included replacement of existing suction header piping in station.suction header piping in station.

Installation of sluice gates to Installation of sluice gates to isolate pump turbines from isolate pump turbines from aqueduct flows during aqueduct flows during maintenance.maintenance.

Included measures to protect Included measures to protect existing structure from damage existing structure from damage during construction.during construction.

33

Bridge Pipe RehabilitationBridge Pipe Rehabilitation

Couplings repaired Couplings repaired and internal joints and internal joints seals installed.seals installed.

34

Tunnel ConstructionTunnel Construction TransmissionTransmission Main constructed in casings across major Main constructed in casings across major

roads, parkways, railways and rapid transit bus route.roads, parkways, railways and rapid transit bus route. Steel pipe electrically isolated from casing pipe via Steel pipe electrically isolated from casing pipe via

casing spacers.casing spacers. Annular space grouted.Annular space grouted.

35

Ottawa River Parkway CrossingOttawa River Parkway Crossing Crossing of existing federally Crossing of existing federally

owned four-lane, divided parkway owned four-lane, divided parkway required.required.

Open trenching construction due to Open trenching construction due to presence of methane from landfill presence of methane from landfill » explosion hazard during jacking » explosion hazard during jacking and boring operation.and boring operation.

Existing fill material not suitable for Existing fill material not suitable for jacking and boring » large jacking and boring » large boulders.boulders.

Installation of concrete casing pipe Installation of concrete casing pipe completed over one weekend road completed over one weekend road closure.closure.

Welded steel watermain inserted Welded steel watermain inserted by jacking methods after by jacking methods after completion of casing.completion of casing.

36

Not all goes as Not all goes as planned!planned!

Steel pipe partially Steel pipe partially collapsed during collapsed during grouting.grouting.

Protrusion cut out, grout Protrusion cut out, grout removed and new repair removed and new repair sleeve welded in place.sleeve welded in place.

37

Valve ChambersValve Chambers Steel pipe continued through the valve chambers.Steel pipe continued through the valve chambers.

Features: air valves, drain valves, line valves, branches Features: air valves, drain valves, line valves, branches and access manholesand access manholes

38

Thank you !

Merci !

Thank you !

Merci !