Eastchester Pipeline ProjectEastchester Pipeline ProjectEastchester Pipeline Project

Eastchester Pipeline Extension:Eastchester Pipeline Extension:

SCOPE OF WORK ROUTE OVERVIEWSCOPE OF WORK ROUTE OVERVIEW

•35 miles of 24-inch pipeline

PIPELINE

GROUNDS

CABLE AREAKEYSPAN

AREA

DUMPINGGROUNDS

DUMPING

NORTHPORT

GROUNDS

TERMINAL

DUMPING

R=2200

FT

GROUNDS

DUMPING

NYPA CABLECROSSING Nos.

1, 2, 3 & 4

CON-ED CABLECROSSING

CABLEAREA

NORWALKTEE

PIPELINE

GROUNDS

CABLE AREAKEYSPAN

AREA

DUMPINGGROUNDS

DUMPING

NORTHPORT

GROUNDS

TERMINAL

DUMPING

R=2200

FT

GROUNDS

DUMPING

NYPA CABLECROSSING Nos.

1, 2, 3 & 4

CON-ED CABLECROSSING

CABLEAREA

NORWALKTEE

Agencies involved inAgencies involved in PermittingPermitting

FERC FERC

NYSDECNYSDEC

U.S. Army Corps of EngineersU.S. Army Corps of Engineers

NMFSNMFS

SHPOSHPO

U.S Coast GuardU.S Coast Guard

NYSDOS NYSDOS –– Coastal Zone, EasementCoastal Zone, Easement

U.S. DOT, NYSPSCU.S. DOT, NYSPSC

TBTA TBTA –– BridgesBridges

Town of Huntington Town of Huntington –– Northport Shore approachNorthport Shore approach

NYSEDC NYSEDC –– Hunts Point Shore Approach Hunts Point Shore Approach

Marine PipelineMarine Pipeline Design & Construction Design & Construction -- ConstrainstConstrainst

Plow must be utilized to maximum extent possible. Plow must be utilized to maximum extent possible.

U.S Customs laws (dredging act) place restrictions on the use ofU.S Customs laws (dredging act) place restrictions on the use ofplows. Plow was a purpose built designed for the conditions in plows. Plow was a purpose built designed for the conditions in LIS, LIS, utilizing North Sea experience.utilizing North Sea experience.

The shore approaches were required to be constructed utilizing The shore approaches were required to be constructed utilizing Horizontal Directional Control technology. Horizontal Directional Control technology.

Extensive modifications were required for the Gulf of Mexico Extensive modifications were required for the Gulf of Mexico laybargelaybarge to operate in a northern climate winter. to operate in a northern climate winter.

LiveLive--boating was required adjacent to the Northport cables as a boating was required adjacent to the Northport cables as a substitute for anchors.substitute for anchors.

Midline buoys utilized on breast anchors up to MP 24Midline buoys utilized on breast anchors up to MP 24

5 power cables were crossing by the pipeline5 power cables were crossing by the pipeline

Two suspension bridges were crossed by the pipelineTwo suspension bridges were crossed by the pipeline

Pipeline protection via crushed rock required for last 10 miles.Pipeline protection via crushed rock required for last 10 miles.

Primarily colder weather constructionPrimarily colder weather construction

Marine PipelineMarine Pipeline Construction Construction –– Timing WindowsTiming Windows

East River East River -- Design ConsiderationsDesign Considerations

Pipelines are not typically designed longitudinally within riverPipelines are not typically designed longitudinally within rivers.s.Rivers are a much more dynamic and uncontrolled environment.Rivers are a much more dynamic and uncontrolled environment.Regular vessel transit within a narrow corridor and the everRegular vessel transit within a narrow corridor and the ever--present present potential for anchoring whether planned or during an emergency.potential for anchoring whether planned or during an emergency.24,000 vessels per year transited this area, approximately one h24,000 vessels per year transited this area, approximately one half alf or 12,000 of which were tugboats with oil bargesor 12,000 of which were tugboats with oil barges2 anchorage areas are located on the North shore of the river.2 anchorage areas are located on the North shore of the river.The highly variable bathymetry, ranging from less than 35 feet oThe highly variable bathymetry, ranging from less than 35 feet of f water depth to greater than 110 feet, is indicative of the dynamwater depth to greater than 110 feet, is indicative of the dynamic ic river condition.river condition.Magnetometer surveys indicate a large number of magnetic Magnetometer surveys indicate a large number of magnetic anomalies.anomalies.Many areas of the river have elevated concentrations of Many areas of the river have elevated concentrations of contaminants, posing environmental concernscontaminants, posing environmental concernsBurial of the pipeline in or around the federal channel would haBurial of the pipeline in or around the federal channel would have to ve to be conducted such that the top of the pipeline is located a minibe conducted such that the top of the pipeline is located a minimum mum of seven feet below the channel depth of 35 feet.of seven feet below the channel depth of 35 feet.The anchor spread and handling process would create a potential The anchor spread and handling process would create a potential impediment to shipping during the time the impediment to shipping during the time the laybargelaybarge is approaching is approaching and within the East River.and within the East River.

Mitigation Measures in East RiverMitigation Measures in East River

4,552 ft HDD of the Hunts Point Shore approach, HDD traverses t4,552 ft HDD of the Hunts Point Shore approach, HDD traverses till and low ill and low shear strength shear strength mudsmuds, complicated by a 30 degree horizontal side bend to , complicated by a 30 degree horizontal side bend to accommodate alignment in river.accommodate alignment in river.

Exit pit minimized by utilizing sheet pile cofferdam.Exit pit minimized by utilizing sheet pile cofferdam.

Environmental bucket utilized in controlled manner to minimize Environmental bucket utilized in controlled manner to minimize sedimentation.sedimentation.

All materials excavated placed on hopper barges, for later use iAll materials excavated placed on hopper barges, for later use in backfilling.n backfilling.

Post trench plow utilized to lower pipeline below seabed.Post trench plow utilized to lower pipeline below seabed.

Backfill plow utilized to push windrows back into trench.Backfill plow utilized to push windrows back into trench.

Geotextile fabric and crushed rock placed over back plowed trencGeotextile fabric and crushed rock placed over back plowed trench to h to provide capping of materials and protection of the pipeline.provide capping of materials and protection of the pipeline.

Additional armor rock protection provided at bridgesAdditional armor rock protection provided at bridges

Water Quality MonitoringWater Quality Monitoring

Iroquois is performing water monitoring sampling of a variety ofIroquois is performing water monitoring sampling of a variety ofmarine operations in a variety of different sedimentary and marine operations in a variety of different sedimentary and hydrologic environments. hydrologic environments.

Representative sampling is being taken for the following operatiRepresentative sampling is being taken for the following operations:ons:1) dredging in the East River and Long Island Sound LIS),1) dredging in the East River and Long Island Sound LIS),2) plowing in the East River , 2) plowing in the East River , 3) plowing in coarse3) plowing in coarse--grained sediments in LIS,grained sediments in LIS,4) plowing in fine4) plowing in fine--grained sediments in LIS, andgrained sediments in LIS, and5) stone backfilling in the East River and LIS.5) stone backfilling in the East River and LIS.

The turbidity plumes from these operations are monitored using aThe turbidity plumes from these operations are monitored using an n Acoustic Doppler Current Profiler (ACDP) that uses changes in Acoustic Doppler Current Profiler (ACDP) that uses changes in acoustic backscatter in the water column to provide real time acoustic backscatter in the water column to provide real time measurement of suspended sediments. The ACDP is calibrated usingmeasurement of suspended sediments. The ACDP is calibrated usinglaboratory analysis of collected total suspended sediments sampllaboratory analysis of collected total suspended sediments samples. es.

The results will provide the NYSDEC with data to help evaluate tThe results will provide the NYSDEC with data to help evaluate the he potential impacts associated with suspended sediments and potential impacts associated with suspended sediments and turbidity for future marine construction projects.turbidity for future marine construction projects.

Marine PipelineMarine Pipeline ConstructionConstruction

LaybargeLaybarge arrived on site, arrived on site, Nov 6Nov 6thth 20022002

Plow designed, fabrication Plow designed, fabrication and shipped from UK to and shipped from UK to Newark (March to October)Newark (March to October)

HDDsHDDs of Northport and of Northport and Hunts Point shores initiated Hunts Point shores initiated last week in October.last week in October.

HDD pipe string pulled in at HDD pipe string pulled in at Northport on Nov 26Northport on Nov 26thth

First HDD attempt at Hunts First HDD attempt at Hunts Point failed, pipe was stuck Point failed, pipe was stuck in hole for a month, second in hole for a month, second attempt successful on Feb attempt successful on Feb 1414thth

GULF HORIZON PIPELAY BARGEGULF HORIZON PIPELAY BARGEGULF HORIZON PIPELAY BARGEGULF HORIZON PIPELAY BARGEGULF HORIZON PIPELAY BARGEGULF HORIZON PIPELAY BARGE

LAYBARGE TOW ROUTELAYBARGE TOW ROUTELAYBARGE TOW ROUTE

PROJECT PIPELINE DETAILS:PROJECT PIPELINE DETAILS:

Pipeline Length : 36.45 miles

Diameter/Joint Length : 24” OD x 40’

Mainline Pipe Material : API 5L X70 and X68

Wall Thickness : 0.532” and 0.618”

Number of Joints : 4,687 approx

PIPE LAYING ACTIVITIES :PIPE LAYING ACTIVITIES :PIPE LAYING ACTIVITIES :

Loadout Pipe & Transfer to Laybarge

Load Pipe

Bevel Pipe

Preheat Joint

Align Pipes

Weld Joints

Inspect Welds

Coat Field Joint

PIPE STORAGE, NEWARKPIPE STORAGE, NEWARK

PIPE LOADOUT & TRANSFER TO LAYBARGEPIPE LOADOUT & TRANSFER TO LAYBARGE

LAYBARGE (Gulf Horizon)LAYBARGE (Gulf Horizon)

MATERIAL SUPPLY BARGE AT LAYBARGEMATERIAL SUPPLY BARGE AT LAYBARGE

PIPE TRANSFERPIPE TRANSFER

PIPE FACING MACHINE:PIPE FACING MACHINE:

PIPE JOINT READY FOR ALIGNMENT:PIPE JOINT READY FOR ALIGNMENT:PIPE JOINT READY FOR ALIGNMENT:

Pipeline Alignment Clamp:Pipeline Alignment Clamp:

Preheat:Preheat:

Welding Bug (cont.):Welding Bug (cont.):

AUTOMATIC ULTRASONIC TESTS:AUTOMATIC ULTRASONIC TESTS:AUTOMATIC ULTRASONIC TESTS:

PIPELINE FBE COATING:PIPELINE FBE COATING:PIPELINE FBE COATING:

Grit Blasting

Grit Grit BlastingBlasting

Heating (450 F)Heating (450 F)Heating (450 F)

Spray applicationSpray applicationSpray application

Sea Sleeve FusionSea Sleeve FusionJOINT INFILL:JOINT INFILL:JOINT INFILL:

Infill MaterialInfill Material

Sea Sleeve WrapSea Sleeve Wrap Infill MaterialInfill Material

SEA SLEEVE FINISHED:SEA SLEEVE FINISHED:SEA SLEEVE FINISHED:

PIPE TENSIONER:PIPE TENSIONER:PIPE TENSIONER:

PIPE SUPPORTED OFF BARGE:PIPE SUPPORTED OFF BARGE:PIPE SUPPORTED OFF BARGE:

PIPE EXITING OFF OF BARGE TO SEABED:PIPE EXITING OFF OF BARGE TO SEABED:PIPE EXITING OFF OF BARGE TO SEABED:

PIPE EXITING OFF OF BARGE TO SEABED:PIPE EXITING OFF OF BARGE TO SEABED:PIPE EXITING OFF OF BARGE TO SEABED:

SURVEY CONTROL ROOM ON LAYBARGE:SURVEY CONTROL ROOM ON LAYBARGE:SURVEY CONTROL ROOM ON LAYBARGE:

LAYBARGE MOVEMENT CONTROL ROOMLAYBARGE MOVEMENT CONTROL ROOMLAYBARGE MOVEMENT CONTROL ROOM

LAYBARGE MOVEMENTLAYBARGE MOVEMENTLAYBARGE MOVEMENT

SCOPE OF WORK ROUTE OVERVIEWSCOPE OF WORK ROUTE OVERVIEW

Glen CoveGlen Cove

NorthportNorthportHunts Hunts PointPoint

STEP 1: LAY NORTHPORT HDD STRINGSTEP 1: LAY NORTHPORT HDD STRING

NorthportNorthport

STEP 2: LAY HUNT’S POINT HDD STRING:STEP 2: LAY HUNT’S POINT HDD STRING:

Hunts PointHunts Point

ThrogsThrogs Neck Neck BridgeBridge

Whitestone Whitestone BridgeBridge

STEP 3: INITIATE PIPELAY AT NORTHPORT:STEP 3: INITIATE PIPELAY AT NORTHPORT:

NorthportNorthport

CONTINUE PIPELAY TO THROGS NECK:CONTINUE PIPELAY TO THROGS NECK:

NorthportNorthport

ThrogsThrogs Neck BridgeNeck Bridge

STEP 4: LAYDOWN PIPELINE AT THROGS NECK:STEP 4: LAYDOWN PIPELINE AT THROGS NECK:

ThrogsThrogs Neck BridgeNeck Bridge

City IslandCity Island

Hart IslandHart Island

Whitestone BridgeWhitestone Bridge

Step 5: INITIATE PIPELAY AT HUNT’S POINT:Step 5: INITIATE PIPELAY AT HUNT’S POINT:

ThrogsThrogs Neck BridgeNeck BridgeWhitestone BridgeWhitestone Bridge

TieTie--inin

Hunts PointHunts Point

STEP 6: STEP 6: TieTie--in Prein Pre--Fabricated Fabricated

86 deg Hot Bend:86 deg Hot Bend:

PLOWING: Utilizing North Sea Experience a purpose built plow wasPLOWING: Utilizing North Sea Experience a purpose built plow wasdesigned and fabrication in the U.K. to lower the pipeline belowdesigned and fabrication in the U.K. to lower the pipeline below the the

seabedseabed

Sonar from Plowed Trench

Sands and Tills

• 5-6 ft trench• pull loads up to 200 tons• tow speeds - 1inches/sec

Silty Clay7-8 ft trenchpull loads typically < 50 tonstow speeds – 2-4 inches/sec

Plow Results

Plow and Backfill in East RiverPlow and Backfill in East River

ThrogsThrogs Neck BridgeNeck BridgeWhitestone BridgeWhitestone Bridge

TieTie--inin

Hunts PointHunts Point

Final TieFinal Tie--inin

Eastchester Project Update: The Final TieEastchester Project Update: The Final Tie--InIn

Backfill PlowBackfill Plow

Crushed Rock PlacementCrushed Rock Placement

MAT PLACEMENT AT CABLE CROSSINGSMAT PLACEMENT AT CABLE CROSSINGS

PIP E LIN EA R EA

N Y P A C A BLEC R O SS IN G N o s.

1 , 2 , 3 & 4

C O N -E D C A B LEC R O S S IN G

C AB LEA R EA

PIP E LIN EA R EA

N Y P A C A BLEC R O SS IN G N o s.

1 , 2 , 3 & 4

C O N -E D C A B LEC R O S S IN G

C AB LEA R EA

Winter WeatherWinter Weather

Horizontal Directional DrillingHorizontal Directional Drillingof Shore Approachesof Shore Approaches

••3,000 ft at Northport Shore Approach3,000 ft at Northport Shore Approach••4,552 ft at Hunts Point Shore Approach4,552 ft at Hunts Point Shore Approach

HORIZONAL DIRECTIONAL DRILLINGHORIZONAL DIRECTIONAL DRILLING

HORIZONAL DIRECTIONAL DRILLINGHORIZONAL DIRECTIONAL DRILLING

2424--inch pipe in HDD hole at Northport (Nov 26inch pipe in HDD hole at Northport (Nov 26thth, 02), 02)

HORIZONAL DIRECTIONAL HORIZONAL DIRECTIONAL DRILLINGDRILLING

Northport InterconnectNorthport Interconnect

Construction of 3,800 Construction of 3,800 feet of 24feet of 24--inch pipelineinch pipeline

Interconnect with Interconnect with existing mainlineexisting mainline

Pig launching facilitiesPig launching facilities

Construction initiated Construction initiated 22ndnd week of February.week of February.

Hunts Point Hunts Point -- Onshore PipelineOnshore PipelineConstruction of 4,000 feet of 24Construction of 4,000 feet of 24--inch pipelineinch pipeline

Questions?