Terminal Tie

8/14/2019 Terminal Tie

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CORRIBFIELDDEVELOPMENTPROJECT

OnshoreWorksOnshorePipelineTerminationPoint

METHODSTATEMENTRev01

TerminalTieinandSurfaceWaterManagement

withintheCarrowmoreLakeCatchmentArea.


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ShellE&PIrelandLtd. Title: Terminaltiein&SurfaceWaterManagement

Within CarrowmoreLakeCatchment

DraftEnvironmental ManagementPlan DocumentNo: COR14OPSH0000SEPILEMP

MethodStatement Revision:01 Page1of5

SUMMARY

TheworksoutlinedherecovertheexcavationandinstallationoftheonshorepipelinewithintheTerminal

and all associated diversion of services, surfacewatermanagement, concreteworks, gas pipeline and

ancillaryservicesinstallationaswellaspainting,testingandreinstatementworks.

PURPOSE This methodology describes the works associated with tie in of the onshore

pipelineintotheBellanaboyGasTerminalandtheassociateddiversionofsurface

waterintotheLeenamoreCatchment.

LOCATION NorthWesterncorneroftheTerminal.Pipelinechainage91.42to91.72.

TIMESCALE Approximately6Months

TECHNIQUE SitePreparation

A number of existing serviceswithin the Terminal will have to be diverted to

facilitate pipeline installation including; surface water drainage, groundwater

drainage, security fenceandassociated lighting, roaddrainage systemand road

lighting.Thesequenceisasfollows:

At the tiein location, remove gabion baskets, strip topsoil, demolishconcretechannelatthebottomoftheembankmentandstripoffsurface

gravelandweedblanket.

Excavateexistingburiedcablesanddivertsouthofthepigreceiver(pointwhereonshorepipelinetiesintoterminalstructure).

Insertwaterstoppersinboththesurfacewaterandgroundwatersystemsandsetupoverpumpingsystemsouthofthepigreceiver.

Removelightpolesandassociatedcablejunctionboxes.

Fence

off

a

temporary

working

area

inside

the

Terminal

to

facilitate

pipelineactivities.

Dismantle both existing security fences inside the temporary workingarea.

Saw cut bituminous road layers, excavate and remove to a recyclingfacility.

Demolish concrete open channels and remove to a licensed recyclingfacility.

PipelineInstallation

Pipelineinstallation

within

the

Terminal

consists

of

standard

welding

and

pipe

trenching procedures used elsewhere on the onshore pipeline in addition to

anchor block construction, valve pit construction and overground pipe work

painting.Thesequenceisasfollows:

Excavatepipelinetrenchfrompigreceivertotheanchorblocklocation. Excavate anchor block location and prepare surface for steel fixing by

placing blinding layer of concrete. This will also control surface water

withintheanchorblockexcavation.

Install steel reinforcement,erect temporary timber shuttering andpourconcretebase.

Removetimbershutteringandbackfillfoundationbaseuptoundersideof


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thepipeline.

Whiletheanchorblockisbeingconstructedtheexistingsurfacewaterandgroundwaterdrainagepipeswillberemovedfromthepipelineroute.

The pipeline and associated ancillary services will be strung out andwelded/jointedandpreparedforlaying.

Theremainderofthepipelinetrenchwillthenbeexcavatedandprepared. Thepipelineandancillarieswillthenbelaid,inspectedandbackfilledwith

suitablematerial.

Theremainderofthetrenchwillbebackfilledwiththeoriginalexcavatedmaterial.

The surface water and ground water pipes will be relaid during thepipelinebackfilling.Thesepipelineswillberetestedpriortoallowingthem

returntonormaloperation.

Once thepipelinehasbeenbackfilled,thepipelinesectionsituatedovergroundwillbesandblastedandpaintedforcorrosionprotection.Thismay

requiretheerectionofaweatherproofshelter.

SurfaceWaterManagement

Surfacewater frompipeline constructionworks that liewithin theCarrowmore

Lake catchment (ch 91.42 to 91.72) will be collected, attenuated and taken

through a settlement tank or treatment/filtration unit before being discharged

intotheLeenamoreRivercatchment(northofch91.42).

Theanchor

block

and

pipeline

excavations

will

be

dewatered

by

pumping

surface

watertoadrainrunningparalleltotheexistingstoneroad.Thisdrainwillconvey

surface water to a settlement tank/treatment unit located upstream of the

dischargepointintotheLeenamoreRiver.

Itshouldbenotedthatwatercollected intheTerminaldrainagesystemswillbe

keptseparatefromanywatercollectinginthepipelineexcavations..

Reinstatement

Pipelinereinstatementhastwodistinctoperations;reinstatingtheTerminalinside

thepermanent

security

fencing

(ch.

91.67

91.72),

and

reinstatement

of

the

onshorepipelinetemporaryworkingarea(ch.91.42to91.67).Itshouldbenoted

that reinstatement of ch 91.67 to 91.42 is seasonal and will be incorporated

duringthelandscaping/reinstatementoftheentireTerminaltemporaryfacilities.

Chainage91.6791.72willbereinstatedasfollows:

Construct concrete open channels, reinstate gravel area between roadandpigreceiverandreinstallbituminousroadlayers.

Reinstall inner security fences including reinstatement of weed controlblanketandgravelbetweenthefences.

Reinstatelightpolesandpreviouslydivertedundergroundcables.


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ReinstategravelinsidetheTerminalandremovetemporaryfencing. Reconstructdrainagechannelatbottomofembankmentbatter. Reinstatetopsoilonbatterandseedasrequired. Reinstallgabionbaskets.

EQUIPMENT Minidigger Roller

FrontTippingDumpers Vibratingcompactor(whackers)

ArticulatedDumptrucks TrackedExcavator(14t46ton)

Roadsaw Concretepump

Consaw Concretepoker

WheeledExcavator Cranes(50100ton)

Sandblaster PaintSprayer

Sidebooms Weldingunits

RESTRICTIONS Surface water from pipeline construction works that lie within theCarrowmoreLakecatchment(ch91.42to91.72)shallbecollected,attenuated

and taken through settlement/treatmentunitsbeforebeingdischarged into

theLeenamoreRiverCatchment(northofch91.42).

Normalconstructionworkisrestrictedtobetween 07:00and19:00weekdaysand07:00and16:00Saturday.

Noiseandvibrationlimits. Lightingconstraints.


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ShellE&PIrelandLtd. Title: Terminaltiein&SurfaceWaterManagement Within

CarrowmoreLakeCatchment



POTENTIAL

ENVIRONMENTAL

IMPACT

MITIGATION

Noise&LightDisturbance. Noise and vibration will be minimised through design, and appropriateselectionofplantandmachinery. Proactivemaintenanceofplantandequipment. Noise will be reduced by Cladding of stationary machinery such as

generators.

Acousticscreeningandfencingtominimisenoise. Mobileandsitelightingwillbedesignedtolimitlightspillage.

Increaseddustlevels Roads/working areawill be dampened down, as required to ensure dustlevelsduetoconstructionactivitiesarekepttoaminimum.

Sandblastingofpipeworkwillbecarriedoutunderaweatherproofshelter.Constructionactivitiesmayaffectlocalottersandbadgers.

Apreconstructionsurvey forottersandbadgerswillbeundertakenwithin13months

prior

to

construction.

The

areas

to

be

included

are

approximately; 50100m either side of the centre line of the pipeline for

otters,and30meithersideofthecentrelineforbadgers.

Areasofdensevegetationaffectedbythedevelopmentwhichcouldnotbethoroughly searchedwill requiremonitoringbyappropriateexpertsduring

vegetationclearance.

Excavationswillallowottersandbadgersameansofescapeiftheygetintotheexcavation.Thiswillbeachievedbyplacingaccess/egressplanksand/or

soilrampsatnecessarylocations.

Work activitieswill be limited to between the hours of 07:00 and 19:00weekdays

and

07:00

and

16:00

Saturday.

Capswillbeplacedoverallpipeendsatnight. Gapswillbe leftatthebaseofthefencingat75m intervalstoallowotters

and badgers free access and a means of escape across the temporary

workingarea.

Constructionactivitiesmayaffectamphibians

Anyfrogsidentifiedwillbetranslocatedunderlicensetoasuitablelocation. Habitat reinstatementwill recreate the formerchannelanddrainsystems

sothatfrogsmayusethesepostconstruction.

Constructionactivitiesmayaffectnestingbirds

Vegetation clearancewillbeundertakenoutside thebreedingbird seasoni.e.MarchtoAugust,wherefeasible.

Revegetationandplantingofnativescrubspecieswillbecompletedduringreinstatement.

Pollutionofterrestrialandaquatichabitatsduespillageorleaksofoil/dieselfromplantandequipment.

Machineryandplantwillbeinspectedpriortomobilisationtosite. Refuellingofplant/machinerywillonlytakeplaceindesignatedareas. Spillkitswillbeavailableonsite.


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ShellE&PIrelandLtd. Title: Terminaltiein&SurfaceWaterManagement Within

CarrowmoreLakeCatchment



POTENTIAL

ENVIRONMENTAL

IMPACT

MITIGATION

ReleaseofpipelinedischargewaterstotheCarrowmoreLakeCatchmentcouldhavenegativeimpactondrinkingwaterquality.

All surfacewater from construction activitieswithin theCarrowmore LakeCatchment shallbecollected,attenuated& treatedprior todischarge intotheLeenamoreRiverCatchment.

In drain mitigation will be placed as required to reduce silt impact onassociatedwaterways.

Worksmaydisturbarchaeologicalremains.

Alicensedarchaeologistwillbeonsitetomonitorallexcavations.

Documents

Terminal Tie