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  • NEW PARALLEL RUNWAY DReDgINg & ReCLAMATION WORkS · In October 2013 construction of the New Parallel Runway (NPR) progressed to its next important stage – the Dredging and Reclamation
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In October 2013 construction of the New Parallel Runway (NPR) progressed to its next important stage – the Dredging and Reclamation works. Sand pumping was completed on 7 December 2014. THE DREDGE VESSEL • Brisbane Airport Corporation (BAC) signed a contract with Jan de Nul (Australia) Pty Ltd in October 2013, one of the world’s largest and most experienced dredging contractors, to undertake the reclamation works at the 360ha New Parallel Runway site at Brisbane Airport. • Jan de Nul used the Charles Darwin trailer suction hopper dredge (TSHD), one of the newest in its fleet, to undertake the works. • The Charles Darwin used powerful suction tubes equipped with a drag head to draw sand from an approved site in Moreton Bay into its ‘hopper’ for transport ashore. • Once at its mooring the Charles Darwin pumped a mixture of sand and water through a 4.5 kilometre long pipeline to the reclamation site. • The site required 11 million cubic metres of sand to raise it above the one-in-100-year flood level. The preparatory works included construction of: • A temporary dredge mooring in the Brisbane River; • A pipeline to the runway site crossing the Luggage Point Waste Water Treatment Plant land and the operational airfield at Brisbane Airport; • The primary reclamation bund; and • BMD, the Civil Works contractor, to complete the site clearing. THE RECLAMATION • The area filled is approximately 360ha - 3600m long and about 1000m wide and currently sits at around sea level. • The ground level must be raised by 3m for the NPR to be flood proof and immune from rising sea levels brought about by climate change. • It also requires raising to integrate seamlessly with the existing runway and taxiway system. • The underlying soils of the NPR site are very soft and extend to 35m below ground surface. • The application of a heavy load (eg: sand) forces moisture out of the soil causing the ground level to sink as the earth is consolidated to form a stable foundation for the runway. This is known as ‘settlement’. Parts of the site will sink by more than 2m. PROJECT UPDATE MARCH 2015 1. The Jan de Nul dredge ‘Charles Darwin’ completed its task of pumping 11 million cubic metres of sand ashore to the reclamation site nearly two months ahead of schedule on 7 December 2014. OVERVIEW This Fact Sheet provides information about the extensive environmental studies undertaken and the environmental management which was put in place to monitor the Dredging and Reclamation works for Brisbane Airport Corporation’s New Parallel Runway (NPR) project. 1 NEW PARALLEL RUNWAY DReDgINg & ReCLAMATION WORkS About Brisbane Airport: Brisbane Airport (BNe), is the premier gateway toQueensland and the third largest airport in Australia by passenger numbers. Operating 24 hours a day, seven days a week, BNe has two major terminals servicing 28 airlines flying to 41 national and 27 international destinations. More than 22 million passengers travelled through the airport in 2014. BNe was named Capital City Airport of the Year in the 2014 Australian Airports Association National Awards and rated as Australia’s No.1 airport for quality of service 10 years in a row in the Australian Competition and Consumer Commissions’annual survey. For information visit www.bne.com.au or email [email protected]

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Page 1: NEW PARALLEL RUNWAY DReDgINg & ReCLAMATION WORkS · In October 2013 construction of the New Parallel Runway (NPR) progressed to its next important stage – the Dredging and Reclamation

In October 2013 construction of the New Parallel Runway (NPR) progressed to its next important stage – the Dredging and Reclamation works. Sand pumping was completed on 7 December 2014.

The DReDge VeSSel

• BrisbaneAirportCorporation(BAC)signedacontractwithJandeNul(Australia)PtyLtdinOctober2013,oneoftheworld’slargestandmostexperienceddredgingcontractors,toundertakethereclamationworksatthe360haNewParallelRunwaysiteatBrisbane Airport.

• JandeNulusedtheCharlesDarwintrailersuctionhopperdredge(TSHD),oneofthenewestinitsfleet,toundertaketheworks.

• TheCharlesDarwinusedpowerfulsuctiontubesequippedwithadragheadtodrawsandfromanapprovedsiteinMoretonBayintoits‘hopper’fortransportashore.

• OnceatitsmooringtheCharlesDarwinpumpedamixtureofsandandwaterthrougha4.5kilometrelongpipelinetothereclamation site.

• Thesiterequired11millioncubicmetresofsandtoraiseitabovetheone-in-100-yearfloodlevel.

Thepreparatoryworksincludedconstruction of:

• AtemporarydredgemooringintheBrisbane River;

• ApipelinetotherunwaysitecrossingtheLuggagePointWasteWaterTreatmentPlantlandandtheoperationalairfieldatBrisbane Airport;

• Theprimaryreclamationbund;and

• BMD,theCivilWorkscontractor,tocompletethesiteclearing.

The ReclamaTION

• Theareafilledisapproximately360ha-3600mlongandabout1000mwideandcurrentlysitsataroundsealevel.

• Thegroundlevelmustberaisedby3mfortheNPRtobefloodproofandimmunefromrisingsealevelsbroughtaboutbyclimatechange.

• Italsorequiresraisingtointegrateseamlesslywiththeexistingrunwayandtaxiwaysystem.

• TheunderlyingsoilsoftheNPRsiteareverysoftandextendto35mbelowground surface.

• Theapplicationofaheavyload(eg:sand)forcesmoistureoutofthesoilcausingthegroundleveltosinkastheearthisconsolidatedtoformastablefoundationfortherunway.Thisisknownas‘settlement’.Partsofthesitewillsinkbymorethan2m.

PROJecT UPDaTeMARCH2015

1.TheJandeNuldredge‘CharlesDarwin’completeditstaskofpumping11millioncubicmetresofsandashoretothereclamationsitenearlytwomonthsaheadofscheduleon7 December2014.

OVeRVIeW

ThisFactSheetprovidesinformationabouttheextensiveenvironmentalstudiesundertakenandtheenvironmentalmanagementwhichwasputinplacetomonitortheDredgingandReclamationworksforBrisbaneAirportCorporation’sNewParallelRunway(NPR)project.

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NEW PARALLEL RUNWAY

DReDgINg&ReCLAMATIONWORkS

about Brisbane airport: BrisbaneAirport(BNe),isthepremiergatewaytoQueenslandandthethirdlargestairportinAustraliabypassengernumbers.Operating24hoursaday,sevendaysaweek,BNehastwomajorterminalsservicing28airlinesflyingto41nationaland27internationaldestinations.Morethan22millionpassengerstravelledthroughtheairportin2014.BNewasnamedCapitalCityAirportoftheYearinthe2014AustralianAirportsAssociationNationalAwardsandratedasAustralia’sNo.1airportforqualityofservice10yearsinarowintheAustralianCompetitionandConsumerCommissions’annualsurvey.

Forinformationvisitwww.bne.com.auoremailinfo@bacmajorprojects.com.au

Page 2: NEW PARALLEL RUNWAY DReDgINg & ReCLAMATION WORkS · In October 2013 construction of the New Parallel Runway (NPR) progressed to its next important stage – the Dredging and Reclamation

• geotechnicalinvestigationshaverevealedthatthesoilsvaryinstrengthovertheNPRfootprint.Sandwasstrategicallyplacedatvaryingheights,uptoamaximumof8mabovegroundleveloverthesoftestareas,toachieveasuitablyuniformgroundsettlementalongits3600mlength.

• geotechnicalmodellinghascalculatedthattoraisethesurfacelevelby3mandachievethenecessarysettlementwithinfouryears,upto11millioncubicmetresofsandwouldbe required.

• Toacceleratethesettlementprocess,330,000vertical‘wickdrains’wereinsertedintothegrounddownto35metresinthesoftestpartsofthesite.Thisallowedthemoisturetobedrawnfromthesoilmorequicklythanbytheactionofgravityalone.

• Thereclamationdesigninvolvedmorethan10,000kmofthesewickdrainsbeingspacedascloseasonemetreapartinthesoftest areas.

environmental management

• ThedredgingwascarriedoutwithinanareaadjacenttothemainshippingchannelinMoretonBay.

• BAChadafederallyapprovedConstructionenvironmentalManagementPlan(CeMP)inplacetomanageanyimpactsasidentifiedintheenvironmentalImpactStatementandMajorDevelopmentPlan(eIS/MDP)process.Referto:www.bne.com.au/corporate/upgrading-your-airport/new-parallel-runway/eismdp

• BACanditscontractorJandeNulhaddedicatedprofessionalenvironmentteamsinplacetoimplementtheapprovedCeMPandoverseearangeofsuccessfullyprovenenvironmentalmanagementstrategiesforbothonandoffairportland.

• Themostsignificantenvironmentalissuesincludedmonitoringofwaterqualityandbiodiversitybothonandoffairport.

• A24/7real-timemonitoringprogramwasinplaceoncethedredgecommencedworktoensureallwaterqualitylimitsweremetthroughoutthecourseoftheworks.

• Aprevioustrialdredgingin2008conductedattheNPRdredgesitedemonstratedthatnoharmfuleffectsoccurredintheenvironmentallysensitiveareaseithersideoftheextractionfootprint.

• Thesandwaspumpedtothesitethroughthepipelineinaslurrymixofwaterandsandinaratioofupto5:1.

• Thatmeansforeachloadof30,000m3ofsand,upto150,000m3ofwaterwasalsodeliveredtothereclamationsiteformanagementpriortorelease.

• ThewaterwastakenfromtheBrisbaneRiveratthemooringlocationandmixedwiththesandforpumpingpurposes.

• Thewaterwascontainedonsitewithintheprimaryreclamationbundandtail-waterpondsallowinganysedimenttosettleoutbeforebeingreleasedbackintothesystemviathenewmajordrainagechannelsconstructedaspartofearlycivilworks.

• Waterwasnotreleaseduntilestablishedwaterqualitydischargelimitsweremet.

• Dredgingandsandpumpingoperationswerecompletedon7December2014.

• Thesitewillnowbeallowedtosettleforfouryearstoprovideacompressedandstablebaseonwhichtobuild.

• TheNewParallelRunwayisscheduledtobecommissionedby2020.

2.Thewaterandsandmix(ratioof5:1)arrivesonsitefromthedredgesite.

3.Wickdrainswerepunchedintothesoftunderlyingsoildtoadepthofover30metrestohelpdrainthesite.

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Forinformationvisitwww.bne.com.auoremail:[email protected]


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