Form for the referral of a proposal to the …...Australian Company Number(s) OR Australian Business...

PublishedJuly2018

EPARe

ferralForm

FormforthereferralofaproposaltotheEnvironmentalProtectionAuthorityunderSection38oftheEnvironmentalProtectionAct1986

Referrerinformation

Whoisreferringthisproposal?

üProponent

�Decision-makingauthority

�Communitymember/thirdparty

NameDrAdamCohen Signature

Position

ManagingDirector Organisation

AustralasianMarineAssociates

Email [email protected]

Address Suite3B TownshipDrive

BurleighHeads Qld 4221

Date 15thJune2020

DoesthereferrerrequestthattheEPAtreatanypartoftheproposalinformationinthereferralasconfidential?Provideconfidentialinformationinaseparateattachment.

�Yes üNo

Referraldeclarationfororganisations,proponentsanddecision-makingauthorities:

I,DrAdamCohendeclarethatIamauthorisedtoreferthisproposalonbehalfofMungalaluTruscottAirbaseandfurtherdeclarethattheinformationcontainedinthisformistrueandnotmisleading.

PartA:ProponentandproposaldescriptionProponentinformation

Nameoftheproponent/s(includingTradingNameifrelevant)

MUNGALALUTRUSCOTTAIRBASEPTYLTD

AustralianCompanyNumber(s) � ORAustralianBusinessNumber(s) ü

85088076313

Contactfortheproposal(ifdifferentfromthereferrer)Pleaseinclude:name,physicaladdress,phone,andemail.

�Yes �No

Doestheproponenthavethelegalaccessrequiredfortheimplementationofallaspectsoftheproposal?

üYes �No

Adam Cohen

PublishedJuly2018

Ifyes,providedetailsoflegalaccessauthorisations/agreements/tenure.Ifno,whatauthorisations/agreements/tenureisrequiredandfromwhom?

TheairbaseisunderthetraditionalownershipoftheWunambalGaamberapeopleandismanagedunderleasebyMungalaluTruscottAirbasePtyLtd.MungalaluTruscottAirbasesubleasetheAirbase,withlicencesforaccesstosurroundingroadsandareasofthecoastline,includingtheWestBayBargeLanding.

Proposaltype

Whattypeofproposalisbeingreferred?ForachangetoanapprovedproposalpleasestatetheMinisterialStatementnumber/s(MSNo./s)oftheapprovedproposalForaderivedproposalpleasestatetheMinisterialStatementnumber(MSNo.)oftheassociatedstrategicproposal

üsignificant–newproposal�significant–changetoapproved proposal(MSNo./s:___________)�proposalunderanassessedplanning scheme�strategic�derived(StrategicMSNo.:___________)

Forasignificantproposal:• Whydoyouconsidertheproposalmayhavea

significanteffectontheenvironmentandwarrantreferraltotheEPA?

Theproposalmayhavepotentialimpactsontheenvironmentalfactorofmarineenvironmentalqualityassociatedwithturbiditygeneratedbydredging.Benthiccommunitiesandhabitats,morespecifically,mangroveshavethepotentialtobeaffectedbydredginganddisposalofdredgematerial.Otherenvironmentalfactorswereassessedasnotlikelytobesignificantlyimpactedbytheproposal.RefertoSection7oftheattachedMaintenanceDredgingMarineEnvironmentalImpactAssessment(AMA,2020)supportingdocumentationforfurtherdetails.

Foraproposalunderanassessedplanningscheme,providethefollowingdetails:• SchemenameandnumberFortheResponsibleAuthority:• Whatnewenvironmentalissuesareraisedbythe

proposalthatwerenotassessedduringtheassessmentoftheplanningscheme?

• Howdoestheproposalnotcomplywiththeassessedschemeand/ortheenvironmentalconditionsintheassessedplanningscheme?

Notapplicable

PublishedJuly2018

Proposaldescription

Titleoftheproposal WestBayBargeLandingMaintenanceDredging

NameoftheLocalGovernmentAuthorityinwhichtheproposalislocated.

ShireofWyndham–EastKimberley

Location:a) streetaddress,lotnumber,suburb,andnearestroad

intersection;orb) ifremotethenearesttownanddistanceanddirection

fromthattowntotheproposalsite.

AnjoPeninsula,617kmnortheastofBroomeand305kmnorthwestofKununurra.

Proposaldescription–includingthekeycharacteristicsoftheproposalProvideasanattachmenttotheform

Refertosupportingdocumentation(MaintenanceDredgingMarineEnvironmentalImpactAssessment(AMA,2020).

Haveyouprovidedelectronicspatialdata,mapsandfigureintheappropriateformat?Refertoinstructionsatthefrontoftheform

üYes �No

Whatisthecurrentlanduseontheproperty,andtheextent(areainhectares)oftheproperty?

Thebargelandingwasfirstconstructedin1944tosupplytheMungalaluTruscottAirbase(located~7kmfromthelanding)andthenreconstructedin1989.

Haveyouhadpre-referraldiscussionswiththeEPAatDWERServices?Ifso,quotethereferencenumberand/ortheDWERcontact.

Pre-referralcorrespondencewasinitiatedbetweenDrDanSpooner(onbehalfofMTA)withMichaelPengellyfromtheWAEPAonthe12thOctober2015.Potentialenvironmentalimpactswerediscussedonthe21stOctober2015andawrittenresponsetodiscussionpointswasprovidedinemail(MPengelly,21stOctober2015).

PartB:Environmentalimpacts

Environmentalfactors

Whatarethelikelysignificantenvironmentalfactorsforthisproposal?

üBenthicCommunitiesandHabitat�CoastalProcessesüMarineEnvironmentalQuality�MarineFauna

�FloraandVegetation

�Landforms

�SubterraneanFauna

�TerrestrialEnvironmentalQuality

�TerrestrialFauna

�InlandWaters

�AirQuality

�GreenhouseGasEmissions

�SocialSurroundings

�HumanHealth

PublishedJuly2018

Foreachoftheenvironmentalfactorsidentifiedabove,completethefollowingtable,orprovidetheinformationinasupplementaryreport

Potentialenvironmentalimpacts

1 EPAFactor SeeattachedSupportingDocumentation(Section*)

2 EPApolicyandguidance-Whathaveyouconsideredandhowhaveyouappliedtheminrelationtothisfactor?

SeeattachedSupportingDocumentation(Section*)

3 Consultation–Outlinetheoutcomesofconsultationinrelationtothepotentialenvironmentalimpacts


4 Receivingenvironment–Describethecurrentconditionofthereceivingenvironmentinrelationtothisfactor.


5 Proposalactivities–Describetheproposalactivitiesthathavethepotentialtoimpacttheenvironment


6 Mitigation–Describethemeasuresproposedtomanageandmitigatethepotentialenvironmentalimpacts.


7 Impacts–AssesstheimpactsoftheproposalandreviewtheresidualimpactsagainsttheEPAobjective.


8 Assumptions-Describeanyassumptionscriticaltoyourassessmente.g.particularmitigationmeasuresorregulatoryconditions.


PublishedJuly2018

PartC:OtherapprovalsandregulationStateandLocalGovernmentapprovals

Isrezoningofanylandrequiredbeforetheproposalcanbeimplemented?Ifyes,pleaseprovidedetails.

�Yes üNo

Ifthisproposalhasbeenreferredbyadecision-makingauthority,whatapproval(s)arerequiredfromyou?

N/A

Pleaseidentifyotherapprovalsrequiredfortheproposal:

ProposalactivitiesNA

Landtenure/accessNA

TypeofapprovalNA

LegislationregulatingtheactivityNA

CommonwealthGovernmentapprovals

DoestheproposalinvolveanactionthatmaybeorisacontrolledactionundertheEnvironmentProtectionandBiodiversityConservationAct1999(EPBCAct)?

�Yes üNo

Hastheproposedactionbeenreferred?Ifyes,whenwasitreferredandwhatisthereferencenumber(EPBCNo.)?

�Yes üNo

Date:________

EPBCNo.:_________

Ifreferred,hasadecisionbeenmadeonwhethertheproposedactionisacontrolledaction?If‘yes’,checktheappropriateboxandprovidethedecisioninanattachment.

�Yes �No�Decision–controlledaction

�Decision–notacontrolledaction

Iftheproposalisdeterminedtobeacontrolledaction,doyourequestthatthisproposalbeassessedunderthebilateralagreementorasanaccreditedassessment?

�Yes-Bilateral �No�Yes-Accredited

IsapprovalrequiredfromotherCommonwealthGovernment/sforanypartoftheproposal?Ifyes,describe.

�Yes üNoApproval:

MAINTENANCEDREDGINGMARINEENVIRONMENTALIMPACTASSESSMENTREPORT

WestBayBargeLanding

Preparedfor:MungalaluTruscottAirbasePtyLtd

Date:15thJune2020

MaintenanceDredgingEnvironmentalReport

2

Australasian Marine Associates

DrDanielSpoonerandDrAdamCohen.ManagingDirectorsAustralasianMarineAssociatesPtyLtd

Suite3BTownshipDrive,BurleighHeads4221.

Mobile0404834164or0413033500

ABN:47602913762 ACN:602913762

Frontcover:WestBayBargeLanding,WesternAustralia.

©AustralasianMarineAssociates.Allrightsreserved.

Australasian Marine Associates has prepared this document for the client identified above. The sole purpose of this

document is to enable the client to assess the findings of the Maintenance Dredging Marine Environmental Impact

Assessment Report, prepared by AustralasianMarine Associates. No other party should rely or access this information

withoutpriorwrittenconsentofAustralasianMarineAssociates.Thisdocumenthasbeenpreparedbasedonconfidential

informationprovidedfromtheclient.AustralasianMarineAssociatesmayhavealsoreliedonotherinformationprovidedby

thirdparties toprepare this document, someofwhichmaynothavebeen verified.AustralasianMarineAssociates is a

licencedGoogleProuserandallGoogleEarthimagesinthisdocumentaresubjecttothislicenceandmustnotbereproduced

andsoldasindividualimages.Theseimagesareforthesolepurposeofcommunicationwithinthisreport.Subjecttothe

aboveconditions,thisdocumentmaybetransmitted,reproducedordisseminatedonlyinitsentirety.

DocumentControl:

DocumentVersion

Author Date Comment Approved(AMADirector)

Rev0 DS,AC 15/6/2020 FinalSubmittedtoClient.


3


Contents

ExecutiveSummary...........................................................................................................................5MarineandTerrestrialEnvironmentalQuality...................................................................................5BenthicCommunitiesandHabitat......................................................................................................6MarineParkValues............................................................................................................................6

1.0 Introduction............................................................................................................................8

2.0 SiteHistory..............................................................................................................................92.1BargeandLogisticalRequirements............................................................................................11

3.0 ProposedDredgingWorks.................................................................................................143.1DredgingWorks..........................................................................................................................153.2Disposal/ReclamationManagement........................................................................................16

4.0 LegislationandBestPractice.............................................................................................184.1EnvironmentalProtectionAct1986............................................................................................184.2EnvironmentProtectionandBiodiversityConservationAct1999..............................................184.3EnvironmentProtection(SeaDumping)Act1981......................................................................194.4NationalAssessmentGuidelinesforDredging...........................................................................194.5AcidSulfateSoilsGuidelines.......................................................................................................194.6AustralianandNewZealandGuidelinesforFreshandMarineWaterQuality...........................204.7AboriginalHeritageAct1972.....................................................................................................20

5.0PhysicalEnvironment..............................................................................................................215.1ClimateandMetoceanConditions.............................................................................................215.2Geology......................................................................................................................................24

6.0BiologicalEnvironment............................................................................................................256.1BenthicPrimaryProducerHabitat..............................................................................................256.2ProtectedSpecies.......................................................................................................................346.3NorthKimberleyMarinePark.....................................................................................................34

7.0PotentialEnvironmentalImpacts..........................................................................................357.1MarineSedimentQuality............................................................................................................35AssessmentofSedimentQuality......................................................................................................357.2BenthicPrimaryProducerHabitat..............................................................................................387.3PotentialDredgingImpacts........................................................................................................397.4DredgeMaterialPlacement.......................................................................................................397.3NorthKimberleyMarinePark.....................................................................................................40

8.0MonitoringandManagement................................................................................................428.1Monitoring..................................................................................................................................428.2Management..............................................................................................................................428.3StakeholderConsultation...........................................................................................................42

9.0References.................................................................................................................................47

AppendixA SedimentSampling&AnalysisProgram(AMA,2015)..................................48


4


AppendixB BathymetryWaypoint........................................................................................56

AppendixC MaintenanceDredgingDDSDMP......................................................................57

AppendixD WestBayMaintenanceDredgingEnvironmentalFactorsSummary..........58

AppendixE ProtectedMattersDatabase............................................................................60


5


ExecutiveSummary

TheWestBayBargeLandingislocatedapproximately7kmeastoftheMungalaluTruscottAirbase,in

the Kimberley Region. The site is approximately 520 km west southwest of Darwin and 617 km

northeastofBroomeandislocatedontheAnjoPeninsulaonthenortherntipofWesternAustralia.

Thebargelandinghasbeeninoperationsince1944andformsanimportantoperationallinktothe

MungalaluTruscottAirbase.

Dredgingofthebargelandingisrequiredtorestorenavigabledepths.Thesedimentsaccumulating

within the barge landing approach channel have likely originated from the adjacent creeks,

approximately100mand800msouthofthebargelanding,whichduringthewetseason,mobilise

large volumes of sediment down the estuaries and into the West Bay coastal embayment.

Maintenancedredgingatthebargelandingisusuallyundertakeneverytenyears.Theproponentfor

theproposeddredginganddredgematerialplacementistheMungalaluTruscottAirbase,wholease

thebargelanding(andairbase)fromthetraditionalowners,theWunambalGaamberapeople.

Anenvironmentalassessmentof theproposedmaintenancedredginghasbeencompleted for the

Proposal as described within this document. The assessment evaluates the potential impacts of

dredgingonenvironmentalreceptorswithreferencetothemethodsproposed,aswellastherelevant

environmentallegislation.Duetothesmallareaandvolumeofdredgingproposed,theassessment

focussedonthefollowingpotentialissues:

• Releaseofcontaminants;

• Increasesinturbidityandsedimentation;and

• Potentialacidsulfatesoils(PASS).

Environmentalfactorsthatmaybepotentiallyimpactedare;

• Marineenvironmentalquality;and

• Benthiccommunitiesandhabitats(mangroves).

The proposed maintenance dredging area represents 15,000 m2 of the West Bay nearshoreenvironment. To attain a maintenance dredge depth of -0.5 m LAT, approximately 22,000m3 ofsedimentwillneedtobedredgedwithintheWestBayBargeLanding.MarineandTerrestrialEnvironmentalQuality

Thesuitabilityofsedimentstobedredgedfromthebargelandingwereassessedinaccordancewiththe NAGD and results showed that sediments proposed for maintenance dredging were notcontaminated and suitable for either unconfined offshore or onshore disposal. Risks to marineenvironmentalqualityareconsideredverylow.Sedimentstestedalsocontainedalargeproportionoffineandmediumgrainedsandandgravel,withvery minor percentages of silt/clay (average of 0.6% and 0.7% in surface and sub-surface stratarespectively).FurtherconsiderationofpotentialacidsulfatesoilswillberequiredasasmallnumberofthetestsamplesreportedNetAcidity.


6


Fordisposalactivities,theproposeddredgespoilwillbeplacedonlandwherethereisnodirectorpotential impactonnativeterrestrialvegetationcommunities.Theareahasnoexistingvegetationandischaracterisedbysandandanareacontainingrockboulders,whichformarockwallstructure.DatageneratedfromthesedimentanalysisprogramdidindicatethepresenceofPotentialAcidSulfateSoils(PASS)atthreesamplelocations(outof15tested).Giventhatonshoredisposaliscurrentlythepreferreddisposaloption,asuitableandtargetedinfieldtestingprogramandlimemixingapproachfor specific areas that are likely to contain PASS (i.e. SC8) will be investigated further. PASSmanagement is further addressed in the Dredging and Dredge Spoil Disposal Management Plan(DDSDMP).Thedisposalprocesswillintroduceanareaofsanduptoapproximately2mto3mhigh.Therewillbeno interactionwithestuarineorcoastalprocesses,astheproposeddisposalarea isnotwithinanyareasof tidal influence.The formationof theproposeddisposalareawillhaveno impacton localhydrodynamicsandsedimenttransportprocesses.The area proposed for onshore disposal represents approximately 8,000m2. It is part of a largerforedunesystem.ThistypeofhabitatiscommonalongmostoftheWestBayshoreline.Inthemediumto long term, once thedisposal process is complete, theproposeddredge spoil disposal areawillprovideasupplyofsandtotheforedunehabitat.BenthicCommunitiesandHabitat

Theapproachchannelandbargelandinghasbeenmodifiedfrombargesandothervesselsutlisingthelandingareaforover75years.Thebenthichabitatwithinthisareadoesnotcontainsignificantbenthichabitat(i.e.characterisedbymobilesandflats,rockandboulders).Potential impacts tobenthic primaryproducer habitat (BPPH), includingmangroves, is consideredminorasthereisnohabitat(ormangrovetrees)thatwillbedirectlyimpactedandindirectimpactsarealsoconsideredhighlyunlikely.Mangrovecommunitiesoccurwithin100mnorthoftheproposedmaintenancedredgingarea.Theintensityandextentofanyplumesgeneratedduringthemaintenancedredgingarelikelytobesmall,given the low percentage fines reportedwithin the dredge footprint and considering the type ofmarineplantproposed(i.e.backhoedredge).Theclosestnearshorereefsarelocatedbetween250–500mnorthandsouthofthebargelandingandconsistofamosaicofsandyseabeddominatedbyHalimedaandalsorockyreefandmacroalgalbeds,dominatedbybrownmacroalgae,namelyPadinaandSargassum.MarineParkValues

WhilstthebargelandingislocatedwithintheMarineParkboundaries,itissituatedontheeastern

shorelineoftheAnjoPeninsula,whichlieswithinageneralusezone.Specialusezonesarelocatedto

thenorth and east of theAnjo Peninsula andwill not be affectedby anyof the dredging activity

proposed.DredgingisapermittedusewithintheGeneralZone,butonlysmall-scaledredgingforthe

purposeofaccessandsafetyisgenerallyallowable.

WhencomparedtothekeyperformanceindicatorsformaintainingnaturalvalueswithinthePark,no

change in community compositionor loss of extent anddensity formangrovehabitat (relative to


7


baseline)andnochangeinsedimentorwaterquality(relativetobaseline)duetohumanactivities

(exceptwhereapprovedbytheappropriateGovernmentauthority)ispermitted.

AstheproposedBargeLandinghasbeenoperatingforover75years,nochangeinthenaturalvalues

orbackgroundwater/sedimentqualityareanticipated(relativetobaseline)fromthedredgingthatis

proposedforthecurrentmaintenanceprogram.


8


1.0 Introduction

TheWestBayBargeLandingislocatedapproximately7kmeastoftheMungalaluTruscottAirbase,in

the Kimberley Region. The site is approximately 520 km west southwest of Darwin and 617 km

northeastofBroomeandislocatedontheAnjoPeninsulaonthenortherntipofWesternAustralia

(seeFigure1).

Thesediments surrounding theWestBayBargeLandinghaveaccumulatedover timeand thishas

limitedaccess forbarges touse the facility. AustralasianMarineAssociateshasbeenengagedby

Mungalalu Truscott Airbase to complete a Maintenance Dredging Marine Environmental Impact

AssessmentReportpriortodredgingattheWestBayBargeLanding.

This report specificallyaddresses thepotential for themaintenancedredgingactivities tomobilise

sediments,aswellasanypotentialcontaminantsofconcernandprovidesvaluablebaselinehabitat

survey information within the vicinity of the West Bay Barge Landing and surrounding marine

environment.Theaimsandobjectivesofthisreportincludethefollowing:

1. Describetheproposeddredginganddredgematerialdisposalactivities;2. Characterise the surroundingmarine environment, within and adjacent to the barge landing,

includingthebenthicecologyandnearshoremangrovecommunitywithinthevicinityoftheWestBayBargeLanding;and

3. Describethepotentialimpactsfrommaintenancedredginganddisposalactivitiesandprovideaseriesofrecommendationstoaddressanypotentialimpacts.

Figure1WestBayBargeLanding(referencedfromGoogleEarthpro).

WestBayBargeLanding

Kimberley

Region


9


2.0 SiteHistory

The Mungalalu Truscott Airbase was originally constructed in 1944 as a Royal Australian Air

Force(RAAF)baseandthemarineinfrastructure(BargeLanding)wascompletedinlate1944(Beasy

and Beasy, 1995). The Barge Landing consisted of a sand ramp, with Marsden Matting as

reinforcement(seePlate1).

DuringWorldWarII,MungalaluTruscottAirbasewasknownasTruscottAirfieldandtodayfunctions

asacommercialairfieldusedtoservicetheoilandgasindustryintheTimorSea.Theairbaseisunder

the traditional ownership of the Wunambal Gaambera people and is managed under lease by

MungalaluTruscottAirbasePtyLtd.MungalaluTruscottAirbasesubleasetheAirbase,withlicences

foraccesstosurroundingroadsandareasofthecoastline,includingtheWestBayBargeLanding.The

AirbasewasofficiallyregisteredwiththeCivilAviationSafetyAuthorityasacommercialairbasein

April2005.

AjettywasalsoconstructedatWestBayandincludedatidalslip,whichallowedworktobecarried

outonthehullsofvessels.Othercoastalinfrastructureincludedacontroltower,forthecontrolof

aircraft,shipandboatwatertrafficinWestBayandaworkshopontheforeshoreatthefootofthe

jettyandmessingfacilities(BeasyandBeasy,1995).

TheBargeLandingatWestBaywasthenreconstructedin1989,toallowforbargestoagainaccess

theshorelineandbringinequipmentandmaterialstorefurbishtheMungalaluTruscottAirbase(see

Plate1).TheexistingBargeLandingconsistsofaconcreteramp,whichisapproximately50mlong,

withthebottomhalfoftherampcoveredin1–2mofsand(seePlate2).


10


Plate1BargeLanding,constructedin1944(topimages)andtherampreconstruction1989(bottomimage)(referencedfromBeasyandBeasy(1995).


11


Plate2WestBayBargeLanding,May2020.

2.1BargeandLogisticalRequirements

Thebarge/scharacteristics,whichpresentlyaccessthebargelanding,aswellasbargeslikelytoaccessthebargelandinginthefuture,aredescribedinthissectionofthereport.Thedraft,vesselsize,underkeel clearance requirementsand the frequencyand timeofday thebarge/smayutilise thebargelandingareprovidedinthefollowingparagraphs.

TheexistingbargesthatfrequentthebargelandingaretheJaneVirgo,Length45m,Width11manddraft2.7m(coverphoto)andthetheMVRobertLadlow45mlongx11mwideandhasa2.3mdraft(seePlate3).Thesebargesrequireapproximatelya0.5munder-keelclearance.


12


Plate3MVRobertLadlow

Thespecificationsforthisbargeareasfollows:

• Overalllength:45.5m

• Overallbreadth:11m

• Draft:2.30matDLWL

• Nettons:146

• Grosstons:489

• Cargofuelcapacity:195tons

• Cargofreshwatercapacity:220tons

• Enduranceandspeed:22days@10

knots

• Age:Builtin2008

• Bowdoor:5.9mx8m

• Class:DNV

• PortofRegistry:Darwin,Australia

• Officialnumber:858826

• Complement:5crew

• Callsign:VJD3617

• Mainengines:2x600BHPCumminsKTA19-M3

• Bowthrusters:3tonthrust1mtrdiameter

• Propulsion:Twinfixedpropellers

• Communication:GMDSSA2

• Deckdimensions:MainDeck9.5mwidex25.8

mlong

• Bowdoorarea:5.9mx5.1m

ThelargestofthevesselslikelytousetheWestBayBargeLandingistheMVTerasBandicoot.Thisvesselis55mlongx18mwidex4.5mdeepandhasa3mdraft(seePlate4).Thisbargerequiresapproximatelya0.5mto1munder-keelclearance.


13


Plate4MVTerasBandicoot

Thespecificationsforthisbargeareasfollows:

• Overalllength:55m

• Overallbreadth:18m

• Draft:3.0matDLWL

• Nettons:414

• Grosstons:1369

• Cargofuelcapacity:700m3

• Cargofreshwatercapacity:915m3

• Speed:10knots

• Age:Builtin2010

• Class:ABSA1EAMS

• PortofRegistry:Singapore

• Officialnumber:9594391

• Complement:20crew

• Callsign:9V8745

• Mainengines:2xCumminsKTA19M3

• Bowthrusters:2x477KW(640HP)

• Propulsion:Twinfixedpropellers

• Communication:Two(2)unitFurunoFM8800S

• DeckCargoSpace:480m2

These vessels have a 2.3 m to 3 m draft and therefore, together with the necessary under keelclearanceof0.5mto1m,requirebetween3mand4m(conservativerounding)ofwaterrespectively,forenteringtheBargeLandingarea.ThebathymetryandwaterdepthsinandsurroundingtheWestBayBargeLandingaredescribedinthenextsectionofthisreportandtabulatedinAppendixB.


14


3.0 ProposedDredgingWorks

Theproposedworksconsistofmaintenancedredgingtore-establishanavigabledepthforservicing

barge access into the landing facility (i.e. -0.5m LAT). Current survey of the area indicates that

excavationofapproximate0.5metreto1.5metrewillbenecessary,inordertoachievetherequired

depths.Excavationbattersnotsteeperthan1verticalto4horizontalarerecommendedfortheupper

alluvialsandslocatedabovethetargetdepthwithintheprojectfootprint.

TheareatobedredgedisillustratedinFigure2.Approximately22,000m3ofmaterialisproposedto

be dredged fromwithin the dredge footprint. Themajority of the dredgematerial is expected to

compriseofsand(SeeSection7formoredetail).

Figure2DredgeFootprint(referencedfromSAPImplementationReport,AMA,2015).


15


3.1DredgingWorks

Abackhoedredge(BHD)willbeutilisedtoremovethedredgematerial.Thebackhoedredgewillbe

equippedwithnominallya30tonneexcavator(orequivalent),supportedbyadumbbargeforloading

extractedmaterial(Figure1).Thelongreachexcavatorproposedfortheworkswillallowtherequireddredgingdepthstobeeasilyachievedandwillminimisethepotentialforturbidplumestobecreated.

Figure330tonneexcavatoranddumbbarge(Exampleonly).

TheBHDisstationaryplantanchoredbythreespuds,twofixedatthefrontandonemoveablespud

locatedattherearofthepontoon.AsupportvesselwillassisttomovethebargesandtheBHD.Once

the BHD is in position, the spuds are lowered to provide sufficient anchoring. The excavation is

executedbyloweringtheexcavatorbuckettotheseabedusingtheboomandstickhydrauliccylinders.

Theexcavatoris locatedontopofaturntableatthefrontofthepontoon,allowingittoreachthe

dredgingmaterialandplaceitintothebargehoppers.Oncetheaccessiblematerialisremoved,the

BHDmovestothefollowingstepusingthemovingspud.Thedistancetothenextstepisdefinedby

thematerialcharacteristics,bucketvolumeandsticklength.Ashorterboomandstickgenerallyresult

inhigherexcavatingforces.


16


3.2Disposal/ReclamationManagement

Followingtheexcavationworks,thedredgedmaterialwillbeplacedontopofabargeuntilitreaches

itscapacity.Thebargewillthenbetowedtothebargerampandthematerialwillbetransportedby

excavatoranddumptrucktoitsfinallocation.Thematerialwillbebroughttoshoreandplacedinto

theplacement/beachnourishmentarea(Figure4).

Duringexcavation,handlingandtransporttotheplacementarea,thedredgematerialisexpectedto

reduceinwater/moisturecontentateachstage.Itisexpectedthatthemoisturelevelwillreduced

naturally, allowing the placement of the dredge material in the placement area, with very little

dewateringrequired.Tominimizepotentialairbornesedimentloss,theloading/unloadingoperation

shouldnotbeconductedwhenthewindspeedexceeds30knots.

As thewater content of the dredgedmaterial can vary according to theweather conditions and

physicalcharacteristicsofthesediments,theconstructionofabundwallaroundtheplacementarea

willreducethepossibilityoflossoffines.Toavoidlossoffinestotheenvironment,thebundwalls

shouldbeofasuitablewidthandheight(nominally3m)andabletotrapfinesandpreventrunoffback

intothemarineenvironment.

17

Figure4Proposeddredgingmaterialplacement/nourishmentarea(yellowpolygon).

18

4.0 LegislationandBestPractice

Thefollowinglegislationandguidelinesweredeterminedtoberelevantand/orapplicabletotheProposal:

• EnvironmentalProtectionAct1986(WA;EPAct)• EnvironmentProtectionandBiodiversityConservationAct1999(Commonwealth)• EnvironmentProtection(SeaDumping)Act1981(Commonwealth)• NationalAssessmentGuidelinesforDredging(NAGD;CA2009)• AcidSulfateSoilsGuidelinesSeries(DER2015)• AustralianandNewZealandGuidelinesforFreshandMarineWaterQuality• (ANZECC/ARMCANZ2000)• AboriginalHeritageAct1972(WA)4.1EnvironmentalProtectionAct1986TheEnvironmentalProtectionAct1986(WA)(EPAct)isthekeylegislationgoverningtherequirementforenvironmentalprotectionandmanagementinWAincludingtheassessmentoftheenvironmentalimpactsofanyproposedworksincludingmaintenancedredging.TheEPAct(mainlyPartIV)definestherequirementforenvironmentalimpactassessmentofproposeddevelopmentsinWA.

The approach taken by the EPA during the EIA process has been documented by the EPASU in anumberofEnvironmentalFactorGuidancedocuments,formerlyknownasEnvironmentalAssessmentGuidelines(EAGs).EachEnvironmentalFactordefinedintheStatementofEnvironmentalPrinciples,FactorsandObjectives(EPA2016c)hasacorrespondingguidancedocument.ThefactorsidentifiedasbeingrelevanttothisProjectareoutlinedinSection5toSection7.

UnderSection38(1)oftheEPAct(PartIV),whereaproposedprojectdevelopmentislikelytohaveasignificanteffectontheenvironment,theproponentmustrefertheproposaltotheEPAforadecisionon whether it requires formal environmental impact assessment, and if so, at what level ofassessment.TheDoTwillrefermaintenancedredgingprojectstotheEPAiftheyareanticipatedtopotentially have a significant effect on the environment and no environmental approvals havepreviously been obtained. Itmay also be appropriate to refer a project if there is a high level ofcommunity/stakeholderconcern.

4.2EnvironmentProtectionandBiodiversityConservationAct1999If the maintenance dredging project is likely to have a significant impact on matters of nationalenvironmentalsignificance(MNES)itwillrequireassessmentbytheDepartmentofEnergyandtheEnvironment)DotEEundertheEnvironmentProtectionandBiodiversityConservationAct1999(EPBCAct).EnvironmentalmattersofnationalsignificancearedefinedbytheEPBCActas:

• listedthreatenedspeciesandecologicalcommunities• migratoryspeciesprotectedunderinternationalagreements• Ramsarwetlandsofinternationalimportance• theCommonwealthmarineenvironment• theGreatBarrierReefMarinePark• WorldHeritageproperties• NationalHeritageplaces• nuclearactions.


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It is not anticipated that the maintenance dredging campaign will have a significant impact onanyMNES(seeSection7),therefore;referralundertheEPBCActisnotanticipated.

4.3EnvironmentProtection(SeaDumping)Act1981TheEnvironmentProtection(SeaDumping)Act1981appliestothedisposalofcontrolledmaterialinAustralianWatersotherthanwaterswithinthelimitsoftheStateorInlandWaters.TheNAGD(CA2009)defineswaterswithinthelimitsofaStateasthosewatersthatliewithintheconstitutionallimitsoftheStateandincludefeaturessuchasbays,gulfs,estuaries,inlets,portsandharbours.

Disposal of dredgedmaterial is proposed to occur abovehigh-watermark henceno sea dumpingpermitwillberequiredundertheEnvironmentalProtection(SeaDumping)Act1981.

4.4NationalAssessmentGuidelinesforDredgingTheNAGD(CA2009)provideaframeworkforthereviewandassessmentofoceandisposalofdredgedmaterial insupportof theEP(SeaDumping)ActandtheEPBCAct.Althoughoceandisposal isnotproposed for the dredgematerial, the guidelines provide a basis for classifying the suitability forunconfinedoffshoredisposal.

Assessmentofsuitabilityfordisposalonshoreisconsideredbycomparingvaluestothemarineinterimsedimentqualityguidelines,whichareequivalenttotheNAGD(CA2009)ScreeningLevelsandtheANZG(2018)InterimSedimentQualityGuidelines(ISQG).TheSedimentSamplingandAnalysisPlanImplementationReport(AMA,2015)findingsarediscussedinSection7.

4.5AcidSulfateSoilsGuidelinesTheproposedmaintenancedredgingisinanopenembayment,wheresedimentsarepredominantlysand with minor silt, but which is also located adjacent to a small mangrove lined creek. ThedisturbanceofASScanincreasepHlevelsandacidity,andcausemobilisationofmetalsintothewatercolumn.TheAcidSulfateSoilsGuidelinesSeries(DER2015)containsguidanceonhowtoidentifyASSriskareasand thesubsequentassessmentmethods, including samplingand reporting formaterialintendedforlandreclamationpurposes.TheseguidelinesoutlineariskassessmentapproachforASSunder the CS Act. The Sediment Sampling and Analysis Plan Implementation Report (AMA, 2015)discusses PASS and the findings recommendations are discussed in Section 7 and in the projectDredgingandDredgeMaterialDisposalManagementPlan(AMA,2020).


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4.6AustralianandNewZealandGuidelinesforFreshandMarineWaterQualityDredginghasthepotentialtocausethereleaseofcontaminantsintothewatercolumnandwithinreturnwaterfromdisposalofdredgedmaterial.Theassessmentofpotentialduringdredgingwaterqualityimpactsisbycomparisonofthepotentialcontaminantsofconcern(PCOC;ofelutriatesampleconcentrationsoftheproposedmaterialpriortodredgingand/orofthereturnwaterconcentrationsduringdredging)toANZG(2018)triggervaluesforphysicalandchemicalstressorsandtoxicants.

Asthesedimentstestedarechemicallyclean,thepotentialforreleaseofcontaminantsintothewatercolumnisconsideredverylowasdiscussedinSection7.

4.7AboriginalHeritageAct1972Dredging activities have the potential to disturb sites of Aboriginal Heritage significance. TheWADepartmentforAboriginalAffairsmaintainaregisterofover22000AboriginalHeritagesites(whichcan includeartefacts, engravings,paintings,mythologicalor ceremonialplaces) inWAwhichhavebeendefinedundertheAboriginalHeritageAct1972(AHAct).IfevidenceofAboriginalHeritageislocatedduringtheassessmentorimplementationofaprojectdevelopment,itmustbereportedtotheRegistrarofAboriginalSitesundertheAHAct.

TheairbaseisunderthetraditionalownershipoftheWunambalGaamberapeopleandismanagedunderleasebyMungalaluTruscottAirbasePtyLtd.


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5.0PhysicalEnvironment

5.1ClimateandMetoceanConditionsTheAnjoPeninsulaandNapierBroomBayformpartoftheextremenorthernKimberleyRegion,wheresubtidalgeologicalfeaturesareinfluencedbyameso-tidalregimeandextremeweatherconditionsassociatedwithonset andpassageof thewet seasonmonsoonal conditions and tropical cyclones(EliotandEliot,2008).Akeydistinguishing featureofNapierBroomBayandWestBay is that theaveragespring-tiderangeis lessthanmostotherareasoftheKimberley,witharangeof2to3m,comparedto5mthroughoutmostothercoastalenvironmentsintheregion(seeFigure5).

Thehightidesoftheregionprovideasignificantdrivingforceforinshorecurrents,aswellasdirectlyaffectingcoastalinundationandtheimpactofsurgeassociatedwithtropicalcyclones,wherethemostdamagingsurgesusuallyarethoseoccurringclosetospringhightideconditions(EliotandEliot,2008).Ebbtidedeltasareafeatureoftheregion,wherefoursmallebbdeltasoccurontheAnjoPeninsula.These indicate base flow from the streams during the dry season, together with recirculation ofsedimentbetweentheinshore(inland)andnearshorewaters(EliotandEliot,2008).

Regionalwaveclimatewillalterifregionalwindpatternschange.WaveclimateisinfluencedbytheratioofSEtoNWwindsrespectivelyassociatedwithanticyclonesandmonsoonsandonshorewinds(in a regional sense) will produce enhanced wave and surge conditions (Eliot and Eliot, 2008).SignificantwaveheightanddirectionfromtheglobalwavewatcharchiveispresentedinFigure6andhistoricwindspeedanddirectionpresentedinFigure7.Wavesofgenerally<1minheighthavebeenrecordedinnearshoreareasintheKimberlyRegion,butthisincreasessubstantiallywithincreasingdistanceoffshore.

Rainfall in the Kimberley Region is predominately associatedwithmonsoonal thunderstorms andtropicalcyclones,wheretheannualrainfallvariesfromapproximately500millimetresatBidyadanga,nearGourdonBayinthesouthwest,toover1,200millimetresatKalumburuinthenorth(EliotandEliot,2008).Meanannualrainfallincreaseswithdistancenorth.Themajorityofrain(approximately90%)fallsbetweenNovemberandMarcheachyearandrainfallduringtheremainderoftheyearisgenerallylightandsporadic(DEC,2008).


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Figure5TidalConditionsacrossNorthernAustralia(EliotandEliot,2008).


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Figure6SignificantWaveHeight(referencedfromBuoyweather).

Figure7HistoricWindSpeedandDirection(referencedfromBuoyweather).


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5.2GeologyThegeologyoftheAnjoPeninsulaisKingLeopoldsandstone(EliotandEliot,2008).TheonshoreareasoftheAnjoPeninsulaareoverlainwithsandysoilsandcolluvium.Rockplatformsarewelldevelopedalongtheeasternshores,andtherearedistinctsequencesofsandybeachridgesinembaymentsnorthoftheboatlandinginWestBay(EliotandEliot,2008).

EliotandEliot(2008)describedtheAnjoPeninsulaascontainingsmallcomponentsofcoastalsandsderivedfromerosionofthecoastalsandstoneandlimestone,aswellasfromrecentbiogenicsourcesandsedimentmovedlandwardduringtheHolocenemarinetransgression.EmbaymentssuchasWestBay,commonlycontainedbeachsandsandmuds,thelatterderivedfrombiogenicsourcesincludinglocalmangroveforests(EliotandEliot,2008).DEC(2008)reportedmangrovecommunitiesliningtheshoresofNapierBroomeBay,includingintidalcreekmouths,suchasthoseimmediatelysouthoftheWestBayBargeLandingandonelevatedintertidalrockyplatforms.

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6.0BiologicalEnvironment

TheAnjoPeninsula,whichencompassestheonshoreenvironmentsimmediatelynorthandwestofWestBayandNapierBroomBay,werepreviously investigatedbyDepartmentofEnvironmentandConservation(DEC),aspartofaninvestigationofpotentialLNGsitesintheKimberly(DEC,2008).

InthenearshoreareasofNapierBroomeBay,whichislocatedimmediatelyadjacenttoandoffshoreofWestBay,sandstonereefswerecommon(DEC,2008).Immediatelyoffshorefromtherockyandmangrove-linedshoresandthenseawardtoapproximatelythe5mbathymetriccontour,rockyreefsandsandbankswerereported.

DEC(2008)reportedanextensive(probablyintertidal)sandbaracrossthemouthofWoppinbieCreek,whichdrainsintoDeepBay,immediatelysouthsoutheastofWestBay.Broadareasofbaresandandsandysedimentswerereportedtoalsooccur.ThedeepersedimentaryareasofNapierBroomeBay(>10m)weregenerallyreportedtocontainfinesediments.

6.1BenthicPrimaryProducerHabitatThe coastal vegetation survey and marine habitat survey as part of the present project wereperformed using a combination of satellite imagery and field-based abovewater and underwaterdigitalimagery(seeFigure8).

Figure8MangroveSurveyLocations(referencedfromGoogleEarthPro).


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Mangroves

The coastal vegetation survey sites surrounding the project area are illustrated in Figure 9. Themangrove communities north of the Barge Landing were relatively dense and lined the entireforeshore (seeFigure10). ThespeciesSonneratiaalba,Avicenniamarina,RhizophorastylosaandCeriopstagalwerereportedwithinthe intertidalzone,betweenGPSpoints157and164. IsolatedstandsofRhizophorawerealsoreportedalongtheintertidalforeshore(seeFigure10).TheKimberleycoast contains someof the largest standsofmangroves inAustralia,with a total areaof 140,000hectares(GovernmentofWesternAustralia,2011).

Figure9Mangrovecommunitynorth,northeastoftheBargeLanding

Figure10ThemangalcompositionwasdominatedbyRhizophoraandthemangroveapple,Sonneratia


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Figure11MangrovecommunitysouthoftheBargeLanding.

Themangalcompositionreported1kmsouthoftheBargeLanding,toGPSpoint168,containedstandsofSonneratiaandRhizophora,whichdominatedtheintertidalzone(seeFigure12).Themangrovecommunityfurthersouthwasalsodenser,comparedtothemangrovecommunityimmediatelysouthoftheBargeLanding.

Theproposedonshoredisposal locationwasreportedtocontainbaresand. TheareaselectedforspoildisposalisdiscussedintheEnvironmentalImpactAssessmentsectionofthisreport(seeSection7).


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Figure12Mangrovecommunity1kmsouthoftheBargeLanding,containingRhizophoraandSonneratia.


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SubtidalReef

Thetowedvideoanddropcamerasurveywasundertakenwithinthefootprintofthedredgearea,including the batter slopes, and alsowithin subtidal areas adjacent to the dredge area, includingsubtidalreefcommunitiesupto1kmfromthedredgefootprintandwithinthevicinityoftheoffshoredisposalsite.

Thesubtidalreefhabitatsurveyedincludedareasupto1kmnorth-northeastand1kmsouthoftheBargeLanding,includingsurveyofthedredgefootprint(seeFigure13).

Figure13Towedvideosurveycompletedinsidethedredgefootprintandupto1kmnorthandsouthofthedredgefootprint.


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The towedvideoanddropcamera imagery collectedat theBarge Landingprovideda satisfactoryunderstandingregardingthetopography,substratetypesandbenthichabitatpresent(seeFigure13andGPSpoints136-144).Approximately50mto200meastofthebargelanding,theseabedconsistedof soft sand,withbioturbationpresent. Atapproximately50mout fromthe landing, the seabedcontainedahigherproportionofdarkgreysiltymaterial(seeFigure14).

Figure14Brownsandyseabedwithmuchbiotrubation200moutformthebargelanding,turningtoadarkfinesiltysandapproximately50meastofthebargelanding.

Within50mofthebargelanding,thesubstratechangedsignificantly(seeFigure15).Largeboulderswerereportedthroughoutthearea,coveredinfinesiltmaterial.Somegrowthwasreportedontheboulders,namelysponges.Debriswasalsoreportedthroughout,whichincludedrope,theoriginalfoundationmaterialfromthebargelanding(i.e.grates)andconcrete.

Figure15Within50mofthebargelanding,largeboulderswerereported,withsomespongegrowth.

Thefarthestinshorereefreportedduringthissurveywork,wasatGPSpoints105to108(seeFigure16).Theseabedconsistedofsoftsandybed,dominatedbythegreenmacroalgae,HalimedaandalsomacroalgalbedsdominatedbySargassumandPadina(seeFigure16andFigure17).Gianttrevallywerealsonotedduringthesurveywork.


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Figure16Farthestinshorereefsouthofthebargelanding,containingsoftsandyseabed,withHalimedapresent.

Figure17FarinshorereefcontainingmacroalgalbedsdominatedbySargassum.

Closer in, approximately 500m south of the barge landing (see Figure 13, GPS points 110-112),containedareasofsoftsandyseabedhabitatandalsorockyreef,containingencrustingcorallinealgae,aswellasthebrownmacroalgae,PadinaandSargassum(seeFigure18andFigure19).

Figure18Inshorereef500msouthofthebargelanding,containingsoftsandyhabitatandalsoareasofrockyreef.


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Figure19Inshorereef500msouthcontainingfilamentousgreenalgaeandthebrownalgae,PadinaandSargassum.

Approximately250mnortheastofthebargelanding(seeFigure13,GPSpoints115to122),containedlarge areas of modified rocky reef. Dead coral, Porites was reported as well as some areas ofencrustingcorallinealgaeandsponges(seeFigure20).

Asignificantamountoffinesedimentwasreportedonandaroundtheseareasofrockyreef,whichisobviously a depositional zone inWest Bay. Further northeast, the community changed andwasdominatedbyamacroalgalcommunity(seeFigure21).Thesemacroalgalcommunitieswerepresenton rock,andweredominatedbySargassumandPadinaandon soft sandy seabed, containing thegreenalgaeHalimeda.Cardinalfishwereobservedinandaroundthemacroalgalbeds.

Figure20Inshorereef,250mnortheastoftheBargeLanding,containedheavilymodifiedrockyreef.


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Figure21Inshorereef,250mto350mnortheastoftheBargeLanding,wasdominatedbymacroalgalcommunitiesonrockandsandyseabed.

Thenearshorereefs,500mto1000mnortheastoftheBargeLandingcontainedasimilarmosaicofsandyseabeddominatedbyHalimedaandalsorockyreefandmacroalgalbeds(seeFigure22).Thesereefsalsocontainavarietyoffishandinvertebratefauna,includingnudibranchs(seeFigure23).

Figure22Nearshorereef500mnortheastoftheBargeLanding,containingdeadcoral,PoritesandthebrownmacroalgaeSargassum.RightphotocontainingsandyseabedandPadina.


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Figure23NearshoreReef,500mnortheastoftheBargeLanding,invertebrates,suchasnudibranchsandfish,namelysnapper.

6.2ProtectedSpeciesDuringthefield-basedsurveyworktherewerenosightingsofmarinemegafauna(i.e.dolphins,seaturtlesorwhales);however therewasa single sightingofa~3.5msaltwatercrocodile (Crocodylusporosus)incloseproximitytotheWestBayBargeLanding.

Tosupplementthefieldbasedassessment,asearchoftheProtectedMattersDatabase(DoE2020;Appendix E) indicated 31 listed threatened fauna species as potentially occurring near the bargelanding,includingbirds(11),mammals(8),marinereptiles(6),andsharks(6).Ofthe31species,14aremarinespeciesincluding6speciesofturtle,3speciesofshark,3speciesofsawfishand2speciesofwhale.

6.3NorthKimberleyMarineParkTheWest Bay barge landing is located on the Anjo Peninsula in the North Kimberley. The NorthKimberleyarealieswithinthebroaderNorth-WestMarineProvincialBioregionandformspartoftheKimberleybioregionasdefinedbyIMCRA.Morerecently,asignificantsectionoftheNorthKimberley(includingtheAnjoPeninsula)wasdeclaredaStateMarinePark(DPAW,2016).TheNorthKimberleyMarineParkextendsfromStatelimitsoffshoreuptohighwatermark.


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7.0PotentialEnvironmentalImpacts

ThepotentialenvironmentalimpactsthatmayariseduetothemaintenancedredgingcampaignarediscussedinthissectionofthereportandsummarisedinTable3andTable4andAppendixD.

7.1MarineSedimentQualityAlthoughseadumpingisnotproposedforthismaintenancedredgingprogram,theNAGDassessmentframework (CoA2009)was adopted for determining the suitability of sediments for disposal. Theassessmentframeworkwasconsideredsuitable(andconservative)because:

• the NAGD (CA 2009) provides a framework for assessing the suitability of sediment fordisposalintothemarineenvironment;and

• thepotential impactsofdredgingareexpected tobeon the immediatenearshoremarineenvironment.

AssessmentofSedimentQualityThis section presents the results obtained for the Sediment Sampling and Analysis Plan Implementation Report (AMA,2015). Resultsofchemicalandphysicalanalysisarepresentedhere,togetherwithaqualityassurance/qualitycontrolsection,whichexaminesdataqualityandaidsintheverificationoftheanalyticaldataobtained.

FieldObservations

Thefield-basedsamplingwascompletedon1stJune2015andthedataanalysedinJune2015(fiveyearsagothismonth).Thetargetcoredepthof1mbelowtheseabedwasachievedatmostlocations;however,refusaldidoccuratSiteSC4(seeAppendixA).Therefusalwasfirmandindicativeofrockmaterial.ImagesofcoresextractedareprovidedinAppendixA.

Duringthefieldinvestigation,thesedimentswerelargelyreportedassandwithminorpercentagesofsilt, gravel and shell. This observation is consistent with the surrounding foreshore that wascharacterised by sand dunes and exposed gravel. The associated particle size distribution data isfurtherdiscussedinthephysicalcharacteristicssectionofthisreport.

IndividualSampleResults&NAGD/NEPMAssessment

Asummaryofthesedimentmetal/metalloidanalytedataisprovidedinTable1.The95%UCLforallmetal/metalloid parameters in theWest Bay Barge Landing sediments were reported below therespective NAGD Screening Levels. Furthermore there were no individual metal concentrationsreported above the NADG screening levels. The concentrations of all other analytes tested werereportedbelowdetectionlimits.

PhysicalCharacteristics

Thepercentagegravel,sand,silt/clay,asdeterminedfromthePSDanalyses,isillustratedinFigure24andFigure25.FieldsedimentcoresampleimagesareprovidedinAppendixA. ThecompositionofthesedimentsamplescollectedfromtheWestBayBargeLandingmaintenancedredgingareawereconsistentacrossthetwosamplingintervals.

Most cores containeda largeproportionof fineandmediumgrained sand (averageor82.6%and79.7%insurfaceandsub-surfacestratarespectively),withveryminorpercentagesofsilt/clay(averageor0.6%and0.7%insurfaceandsub-surfacestratarespectively).Core locationSC4waswithinthedeepcentralareaofthemaintenancedredgeareaandthissamplecontainedthelargestproportionofgravel(i.e.>2000μm).Corerefusalwasencounteredatthissite.


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Table1SummaryofAnalyticalResultsandassessmentagainstNADGscreeninglevelsAnalyticalParameters Units Detection

LimitNAGD(2009)ScreeningLevels

NAGD (2009)SedimentQuality HighValues

95%UCLInlet(8sites)0-0.5 0.5-1

Metals Antimony mg/kg 0.5 2 25 * *Arsenic mg/kg 0.4 20 70 3.04 3.47Cadmium mg/kg 0.1 1.5 10 * *Chromium mg/kg 0.1 80 370 7.86 7.83Copper mg/kg 0.1 65 270 1.49 1.68Lead mg/kg 0.5 50 220 * 1.68Nickel mg/kg 0.1 21 52 * 1.03Silver mg/kg 0.1 1 3.7 * *Zinc mg/kg 0.5 200 410 1.79 1.73Mercury mg/kg 0.01 0.15 1 * *

*=allsamplesreturnedanalyteconcentrationsbelowtheDetectionLimit

Figure24WestBayBargeLandingSedimentParticleSizeDistributioninthesurfacelayer(0–0.5m).

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

SC10-0.5 SC20-0.5 SC30-0.5 SC40-0.5 SC50-0.5 SC60-0.5 SC70-0.5 SC80-0.5

<63 63-500 500-1000 1000-2000

>2000


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Figure25WestBayBargeLandingSedimentParticleSizeDistributioninthesubsurfacelayer(0.5–1.0m).

AsummaryoftheacidsulfatesoilanalysisforeachcoresampleispresentedinTable2.Themajorityofcoresamplesreturnednetaciditybelowthereportinglimitof10moleH+/t,and8ofthe15samplesreturnedexcessAcidNeutralisationCapacity (ANC).Therewerehowever, threecoresamples thatreturnedNetAcidity(NA)exceedingtheDER(2015)guidelinesvalueof0.03(%sulphur).

Table2WestBayBargeLandingacidsulfatesoilresults(SPOCAS).

SampleNetAcidity(molesH+/t)

NetAcidity(%Sulphur) ANC(molesH+/t)

LimingRate(kgCaCO3/t)

SC10-0.5 <10 0.006 55 <0.75

SC10.5-1.0 39 0.06 <5 2.9

SC20-0.5 <10 <0.005 38 <0.75

SC20.5-1.0 <10 <0.005 <5 <0.75

SC30-0.5 <10 0.02 57 <0.75

SC30.5-1.0 <10 0.03 54 <0.75

SC40-0.5 37 0.13 <5 2.8

SC50-0.5 14 0.02 <5 1

SC50.5-1.0 <10 <0.005 <5 <0.75

0.0

10.0

20.0

30.0

40.0

50.0

60.0

SC10.5-1 SC20.5-1 SC30.5-1 SC50.5-1 SC60.5-1 SC70.5-1 SC80.5-1

<63 63-500 500-1000 1000-2000

>2000


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SC60-0.5 13 0.02 <5 0.98

SC60.5-1.0 <10 0.009 45 <0.75

SC70-0.5 <10 0.01 52 <0.75

SC70.5-1.0 <10 0.008 56 <0.75

SC80-0.5 <10 0.009 <5 <0.75

SC80.5-1.0 170 0.39 <5 13

Thelocationwiththehighestpotentialacidsulphate(PASS)riskwaslocatedinthelowerstrata(0.5-1m)atSiteSC8.Thissiteislocatedintheseawardsideoftheproposedmaintenancedredgearea.Theothertwocoresampleswerelocatedclosertotheshore,oneinthedeeperstrata(i.e.SiteSC10.5-1m)andSiteSC4surfacesediment.

ItshouldbeacknowledgedthatmanyoftheothercoresamplesreturnedexcessANC,andthatshellfragmentswerenotedduring the coringworks. Should anyoxidationof the sediments occur, theexcessANCwillassistinprovidinganoverallbufferingcapacityforthesedimentwithintheproposedmaintenancedredgingarea.

Overall, Implementation of the Sediment Sampling Analysis Plan (SAP) demonstrated that thesedimentsproposedformaintenancedredgingarenotcontaminatedandfitforunconfinedoffshoreoronshoredisposal.Fortheproposedonshoredisposal,asuitableandtargetedinfieldtestingandlimemixingapproachfortheabovementionedareasshallbeconsidered(seeAMA,2020).

7.2BenthicPrimaryProducerHabitatThebenthichabitatwithin theproposedmaintenancedredgearea ishighlyvariable, ranging fromintertidalbaresandyseabedtodeeperboulder linedsubstrate.Somegrowthwasreportedontheboulders,namelysponges.Debriswasalsoreportedthroughout,whichincludedrope,theoriginalfoundationmaterialfromthebargelanding(i.e.grates)andconcrete.

Excluding the data presented in this report, there is limited background environmental data thatspecifically describes and documents themarine environment inWest Bay. In 2008, theWesternAustralianDepartmentofEnvironmentandConservation–MarineEcosystemsBranchcompletedapreliminaryreconnaissancesurveyofmarinebenthichabitats inthevicinityof theAnjoPeninsula,north-west Kimberley, Western Australia (DEC, 2008). Some key observations from this studyincluded:

“MangrovecommunitiesarecommonalongtheshoresofNapierBroomeBay,includingintidalcreekmouthsandonelevatedintertidalrockyplatforms.InthenearshoreofNapierBroomeBay,sandstonereefsarecommonandcouldbegenerallyclassifiedasalgaldominatedreefswiththenumberanddiversityofcoralcoloniespresentbeinglow,buttendingtoincreasetowardsthetipofthePeninsulaandoffshoresuchasaroundLouisIsland.BroadareasofbaresandandsandysedimentsthatsupportpatchysparsetomediumdensitycommunitiesoffilterfeedersalsooccurinNapierBroomeBay.Atthebroadestlevel,thedominanthabitattypeofsedimentarydeeperareasofNapierBroomeBay(>10m)couldbegenerally classifiedas fine,bioturbatedsedimentwithoccasional sparsedensity filterfeedingcommunities.”

TheobservationsmadebyDEC(2008)wereconsistentwiththeobservationspresentedinthisreport.ThepresenceofdugongandseagrasshaspreviouslybeenreportedinNapierBroomeBay(Walker,


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1996);howeverinWestBay,bothDEC(2008)andmarinesurveyscompletedduringthecourseofthisreport, did not record any seagrass meadows or report any Dugong sightings. Furthermore, thenearshore environment in close proximity to theWest Bay Barge Landing is not ideal habitat forseagrass(i.e.activesandbarareas,highlyturbidandrockysubstrate).

7.3PotentialDredgingImpactsMaintenancedredgingislimitedtothe15,000m2dredgefootprintwithintheBargeLandingarea.Toachievetherequiredbargelandingdepthof-0.5mLAT,approximatelyof22,000m3ofdredgematerialwillberemovedfromtheseabed.

The execution of the dredging will most likely involve a Small/Medium Backhoe Dredge and beexecutedoveran8-weekperiod.Dredgespoilwouldbeloadedintoahopperonabarge,whichwouldenable transportationof the dredge spoil to the shore for disposalwithin the proposedon shoreplacement/nourishmentsite.

Thefieldsurveyconfirmedthattheseabedwithintheexistingbargelanding isprimarilysandwithsomegravelandaminorcontributionofclay/siltwithnobenthicprimaryproducerspeciespresent.Asthebargevesselsutilisingthelandinghaveaveryshallowdraftandareutilisingthefacilityonanalmostweeklybasis,thereisverylittleopportunityforbenthicspeciestocolonisethesandysubstrate.

Indirectimpactsthroughturbidityandsedimentationonadjacenthabitatsarepossible,althoughthefieldsurveysalsoconfirmedthatverylittleBPPHispresentimmediatelyadjacenttothelanding.Themainfindingsfromthefieldsurveywerethattheseabedhabitattothewestandeastofthelandingwereprimarilysoftsand.Nearshorereefsarelocated500mnortheastandsouthoftheBargeLandingand these contain a mosaic of sandy seabed dominated by Halimeda and also rocky reef andmacroalgalbeds,dominatedbybrownmacroalgae,namelyPadinaandSargassum.Theseareaswillalsobeunaffected,giventhelocalisedandsmallscalenatureofthebackhoedredgingworks.

Intertidally,nomangroveswillbeimpactedeitherdirectlyorindirectlyasthenearestmangrovetreesareapproximately100mtothenorthofthelandingandasimilardistancetothesouth.Asignificantstandofmangrovesislocatedinasmallcreeklocated100mtothesouthofthelanding,whichisalsounlikelytobeimpactedbytheproposedmaintenancedredgingactivities.

DirectimpactsonBPPHwillnotoccurduringdisposalactivitiesandindirectimpactstoBPPHresultingfromturbidityorreleaseofcontaminantsareconsiderednegligibleduetothephysicalandchemicalpropertiesof the sediments.No significant impactonBPPH is anticipated,howevermonitoringofturbiditywilloccurtoensurethatburialorclearingdoesnotoccurandthatindirectimpacts(resultingfromreducedwaterquality)arenegligible.

7.4DredgeMaterialPlacementThe proposed disposal area is located adjacent to the existing Barge Landing facility. The area ischaracterised by bare sandwith some areas containing rock boulders (whichwere placed duringlevellingofthebargelandingoffloadingareas).Mangrovestandsoccuralongthewesternboundary,adjacenttotheestuary.Therockbouldersarelocatedonthenorthernsectionofthesiteandformpartofarockwallstructure.

Theproposedplacementareaisnottidallyinfluenced;butabutsthemangrovecommunitythatoccursalongthewesternboundaryofthesite.ThemajorityoftheproposeddisposalareaformspartofthedunesystemalongtheWestBayforeshore.

Basedontheupperlimitof22,000m3andconsideringaconservativebulkingfactorof10%(i.e.basedonspoilbeing99%sand,gravelandboulders),upto24,200m3ofbulkedmaterialwillneedtobedisposalofwithintheproposedonshoredisposalarea(Figure27). Theintentionwillbetobuilda


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sandbundwallaroundtheouterperimeteroftheplacementlocation,toensurethatthematerialiscontainedandremainswithintheboundaryofthesiteandnopotentialrunoffoccursintotheadjacentmangrovecommunity.Anyrunofffromdepositedsandisconsideredunlikely,giventhatthedredgematerialwillbedewateredprior toplacement;whereby thematerialwillbe initiallyexcavatedbybackhoe(withlimitedpotentialforwaterentrainment)andthentransferredtodredgehoppersandthentolandviaexcavatorsbeforebeingtruckedtotheplacement/nourishmentsite.

7.3NorthKimberleyMarineParkWhilstthebargelandingislocatedwithintheMarineParkboundaries,itissituatedontheeasternshorelineoftheAnjoPeninsulawhichlieswithinageneralusezone(seeFigure26).SpecialusezonesarelocatedtothenorthandeastoftheAnjoPeninsulaandwillnotbeaffectedbyanyofthedredgingactivityproposed.DredgingisapermittedusewithintheGeneralZone,butonlysmall-scaledredgingforthepurposeofaccessandsafetyisgenerallyallowable(refertoTable5oftheManagementPlan).

WhencomparedtothekeyperformanceindicatorsformaintainingnaturalvalueswithinthePark,nochange in community compositionor loss of extent anddensity formangrovehabitat (relative tobaseline)andnochangeinsedimentorwaterquality(relativetobaseline)duetohumanactivities(exceptwhereapprovedbytheappropriateGovernmentauthority)ispermitted.

AstheproposedBargeLandinghasbeenoperatingforover75years,nochangeinthenaturalvaluesorbackgroundwater/sedimentqualityareanticipated(relativetobaseline)fromthedredgingthatisproposedforthecurrentmaintenanceprogram.


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Figure26BoundaryandManagementZoningfortheNorthKimberleyMarinePark.


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8.0MonitoringandManagement

8.1MonitoringEnvironmentalmonitoringisoutlinedinfurtherdetailintheDredgingandDredgeMaterialPlacementManagement Plan (AMA, 2020) for the dredging program. Turbidity is not considered anenvironmental impact that requires active monitoring, but will be managed through plumesurveillancemethods.Nowaterqualitymonitoringisrecommendedassedimentswereclassifiedassuitableforopenwaterdisposalanddonotcontainelevatedlevelsofcontaminantsandcontain<1%fines.

Habitatobservations,namelyalongthewesternboundaryoftheplacement/nourishmentareaarerecommendedtobeimplementedbythedredgingcontractor.Observationsofanyerosion,damageor site runoff to themangrovehabitatsnear thedisposal areawill bedocumentedandmeasuresimplementedtomitigateimpacts.Shoulderosionordamagebenoted,thenevidence,intheformofphotographs,willalsobecollected.

8.2ManagementAsthedredgingwilloccurwithintheMarinePark,additionalconsiderationwillbegiventocarefullymanaging the potential for hydrocarbon spills and waste generation from the dredge vessel andexcavationplantandequipment. Activemanagementduringdredging is recommendedtoensureinteractionwiththreatenedormigratorymarinespecies isalsoavoided. Duetothevery localisedarea of dredging and the short duration of the works (i.e. 8 weeks), no additional mitigation isconsideredwarranted.

8.3StakeholderConsultationThetraditionalowners,theWunambalGaamberapeople,wholeasetheAirbase(andBargeLanding)to the Mungalalu Truscott Airbase have been consulted about the proposed dredging and aresupportiveoftheproposalincludingtheplacementofdredgematerialontotheirland.Thetraditionalowners will be consulted prior to commencement of dredging and at the completion of dredgematerialplacement.


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Table3MaintenanceDredgingSummaryofEnvironmentalFactors,Objectives,PotentialImpactsandImpactAssessment

FACTOR OBJECTIVE POTENTIAL IMPACT(S) IMPACT ASSESSMENT

Benthic Communities and Habitat To maintain the structure, function, diversity, distribution and viability of benthic communities and habitats at local and regional scales.

Removal of benthic communities

The proposed maintenance dredging area represents 15,000 m2 of the West Bay nearshore environment. The foreshore of West Bay out to 200 m from shore represents approximately 2,800,000 m2 (i.e. dredging area represents 0.0035% of this area). This area has been modified from barges approaching the landing area for over 75 years. The benthic habitat within this area does not contain significant benthic habitat (i.e. characterised by mobile sand flats, rock and boulders).

Coastal Processes To maintain the morphology of the subtidal, intertidal and supratidal zones and the local geophysical processes that shape them.

Changes to local hydrodynamic and sediment transport processes

The deepening of the approach channel to the barge landing is not likely to impact upon coastal processes or sediment transport processes in the western section of West Bay. There is expected that sand infill into the barge landing approach channel will occur over time.

Marine Environmental Quality To maintain the quality of water, sediment and biota so that the environmental values, both ecological and social, are protected.

Resuspension of potentially contaminated sedimentsModification to existing water quality and impacts on sensitive environmental receptors

The contamination status of the sediment has been assessed and the outcomes confirmed that these sediments to be dredged are not contaminated and are suitable for either unconfined offshore disposal or onshore disposal. Based on this there is no risk of mobilising contaminants during the maintenance dredging and this environmental factor will not be discussed further.The preferred method for dredging is likely to be a Backhoe dredge on a barge. The potential for high intensity plumes is not considered to be high, primarily


44



due to the nature of the material proposed for maintenance dredging (predominantly sand, < 1% clay/silt) and the limited potential for entrainment of water and the localised nature and short duration of the dredging works. Therefore, the impact on local benthic communities is likely to be low. The DDSDMP attached to this report provides further information on how the Mungalalu Truscott Airbase dredge operator will verify plume intensity and extent.

Marine Fauna To maintain the diversity, geographic distribution and viability of fauna at the species and population levels.

Potential impact to fisheries (mangrove) habitat.Potential impact to marine fauna from modifications to water quality conditions.

Mangrove and rocky reef communities have been documented to exist approximately 100m north of the proposed maintenance dredging area. Further to the discussion presented in the previous section, the intensity and extent of any plumes generated during the maintenance dredging are likely to be small. There is a small fraction of fine material in the proposed dredge material (< 1 % silt/clay); however the potential for significant deposition of sediment within the mangroves and rocky reef communities is considered unlikely. Any modification to water quality conditions would be localised.

45

Table4DredgeMaterialPlacementSummaryofEnvironmentalFactors,Objectives,PotentialImpactsandImpactAssessment.


Benthic Communities and Habitat To maintain the structure, function, diversity, distribution and viability of benthic communities and habitats at local and regional scales.

Removal/damage of terrestrial communities

The proposed dredge spoil will be placed on land where there is no direct or potential impact on native terrestrial vegetation communities. The area has no existing vegetation and is characterised by sand and an area containing rock boulders, which form a rock wall structure. This material will likely be used to contain the dredge spoil.

Coastal Processes To maintain the morphology of the subtidal, intertidal and supratidal zones and the local geophysical processes that shape them.

Changes to local hydrodynamic and sediment transport processes

The disposal process will introduce an area of sand up to approximately 2m to 3 m high. There will be no interaction with estuarine or coastal processes, as the proposed disposal area is not within any areas of tidal influence. The formation of the proposed disposal area will have no impact on the local hydrodynamics and sediment transport processes.

Terrestrial Environmental Quality To maintain the quality of water, sediment and biota so that the environmental values, both ecological and social, are protected.

Introduction of potentially contaminated sedimentsModification to existing environment and impacts on sensitive environmental receptors

The contamination status of the sediment has been assessed and the outcomes confirmed that they are not contaminated and are suitable for unconfined offshore or onshore disposal. Based on this finding, there is no risk of introducing contaminants to the terrestrial environment and this environmental factor will not be discussed further.Data generated from the sediment analysis program did indicate the presence of Potential Acid Sulfate Soils (PASS) at three sample locations. Given that onshore disposal is currently the preferred disposal option, a suitable and targeted in field testing program and lime


46



mixing approach for specific areas that are likely to contain PASS (i.e. SC1, SC4 and SC8) should be instigated.PASS management is specifically addressed in the Dredging and Dredge Spoil Disposal Management Plan (DDSDMP) (Appendix C).

Terrestrial Fauna To maintain the diversity, geographic distribution and viability of fauna at the species and population levels.

Potential impact to terrestrial fauna/habitat.Potential impact to fauna from modifications to habitat composition.

The area proposed for onshore disposal represents 8,000 m2. It is part of a larger fore dune system. This type of habitat is common along most of the West Bay shoreline. In the medium-long term, once the disposal process is complete, the proposed dredge spoil disposal area will offer dune habitat. During the spoil disposal work, fauna spotting will be active to ensure disposal activities do not impact on local fauna.


47


9.0References

AMA(2015)SedimentSamplingandAnalysisPlanImplementationReport-WestBayBargeLanding.

PreparedforMungalaluTruscottAirbase.

AMA(2020).DredgingandDredgeMaterialPlacementManagementPlan–WestBayBargeLanding.

PreparedforMungalaluTruscottAirbase.

Beasy,J.,andBeasy,C.(1995).Truscott.TheDiaryofAustralia’sSecretWartimeKimberleyAirbase.

AustralianMilitaryHistoryPublications.pp303.

BOM(2014).SourcedfromtheBureauofMeteorologyWebsite.http://www.bom.gov.au/climate/

dwo/IDCJDW6141.latest.shtml.

Eliot andEliot (2008).Coastal geomorphology: Proposed lnghub locations In theKimberley region

WesternAustralia.ReportforNortherndevelopmenttaskforce.EnvironmentExpertsWorkingGroup.

DamaraWA.Innaloo,WesternAustralia.

NationalAssessmentGuidelinesforDredging,CommonwealthofAustralia,Canberra,2009.

DER(2015)Treatmentandmanagementofsoilandwaterinacidsulfatesoillandscapes.Department

ofEnvironmentRegulation168StGeorgesTerrace,Perth,WesternAustraliaJune2015.

DEC(2008)PreliminaryreconnaissancesurveyofbenthichabitatsintheAnjoPeninsulaarea,Kimberly

Bioregion,WesternAustralia.WesternAustralianDepartmentofEnvironmentConservation–Marine

EcosystemsBranch.PreparedfortheNorthernDevelopmentTaskforce.

Walker,D.I.(1996).Seagrassesandmacroalgae.InWalker,D.I.,Wells,F.E.andHanleyR.(Eds).Survey

of themarine biota of the eastern Kimberley,Western Australia. University ofWestern Australia,

WesternAustralianMuseumandtheMuseumandArtGalleryoftheNorthernTerritory.1996.

Vekta(2012).TruscottAirbaseAerialSurveyProjectReport.PreparedforShoreLandsGroup.VektaPty

Ltd.YassACT.


48


AppendixA SedimentSampling&AnalysisProgram(AMA,2015).

WestBayMaintenanceDredgingArea

SedimentCore South East1 14°4'34.71"S 126°27'19.10"E

2 14°4'35.27"S 126°27'20.18"E

3 14°4'34.38"S 126°27'20.03"E

4 14°4'35.29"S 126°27'21.43"E

5 14°4'35.54"S 126°27'22.22"E

6 14°4'36.36"S 126°27'22.77"E

7 14°4'37.02"S 126°27'24.23"E

8 14°4'35.86"S 126°27'23.99"E

DredgeArea South East

WB1 14°4'33.50"S 126°27'19.02"E

WB2 14°4'36.08"S 126°27'25.08"E

WB3 14°4'37.53"S 126°27'24.34"E

WB4 14°4'37.53"S 126°27'24.34"E

AllcoordinatesinWSG84.


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LaboratoryAnalyticalDataSummary

Sample Moisture ContentAntimony Arsenic Cadmium Chromium Copper Cobalt Lead Manganese Mercury Nickel Selenium Silver Vanadium ZincDescription

% mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg0.1 0.5 0.4 0.1 0.1 0.1 0.5 0.5 0.5 0.01 0.1 0.5 0.1 0.1 0.5

SC1_0-0.5m 15.2 <0.5 3.5 <0.1 5.4 1.3 1.6 <1 3.1 <0.01 1.4 <0.5 <0.1 22 2.9SC1_0.5-1.0m 16.8 <0.5 1.9 <0.1 8.3 1.6 1.1 <1 8.5 <0.01 0.98 <0.5 <0.1 14 2.7SC2_0-0.5m 16.2 <0.5 0.63 <0.1 1.4 0.45 <0.5 <0.5 2.9 <0.01 0.37 <0.5 <0.1 3.8 0.77SC2_0.5-1.0m 17.8 <0.5 <0.4 <0.1 2.3 0.4 <0.5 <0.5 1.6 <0.01 0.34 <0.5 <0.1 3.4 0.81SC3_0-0.5m 17 <0.5 3.4 <0.1 12 2.1 1.2 <1 5.4 <0.01 1.5 <0.5 <0.1 24 2SC3_0.5-1.0m 17.7 <0.5 4.3 <0.1 9.6 2.3 1.1 <1 6.4 <0.01 1.2 <0.5 <0.1 38 1.7SC4_0-0.5m 15.2 <0.5 3.7 <0.1 11 1.9 0.81 <1 6.1 <0.01 1 <0.5 <0.1 28 1.3SC5_0-0.5m 16.5 <0.5 1.8 <0.1 3.2 0.67 <0.5 <0.5 3.1 <0.01 0.72 <0.5 <0.1 6.3 0.78SC5_0.5-1.0m 18.3 <0.5 1 <0.1 3 0.58 <0.5 <0.5 1.1 <0.01 0.3 <0.5 <0.1 6.9 <0.5SC6_0-0.5m 16.9 <0.5 <0.4 <0.1 1.3 0.48 <0.5 <0.5 2 <0.01 0.38 <0.5 <0.1 2 0.6SC6_0.5-1.0m 16.4 <0.5 <0.4 <0.1 0.94 0.33 <0.5 <0.5 1.1 <0.01 0.23 <0.5 <0.1 1.5 <0.5SC7_0-0.5m 17.8 <0.5 2.5 <0.1 3.7 0.74 <0.5 <0.5 5.2 <0.01 0.79 <0.5 <0.1 4.2 0.91SC7_0.5-1.0m 18.5 <0.5 0.47 <0.1 1.9 1 <0.5 <0.5 4.1 <0.01 0.56 <0.5 <0.1 2.7 1SC8_0-0.5m 17.8 <0.5 1.4 <0.1 2.4 0.88 <0.5 <0.5 2.7 <0.01 0.41 <0.5 <0.1 5.6 0.76SC8_0.5-1.0m 17.2 <0.5 5.4 <0.1 9.2 1.7 1.7 <1 5.5 <0.01 1.3 <0.5 <0.1 19 0.98


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Sample Benzene Toluene Ethyl Benzene m+p xylenes o-xylene Total BTEX TPH C6-C9 TPH C10-14 TPH C15-28 TPH C29-36 Monobutyl tin Dibutyl tin Tributyl tin Total Organic Carbon

Description

mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg µgSn/kg µgSn/kg µgSn/kg %

0.2 0.2 0.2 0.4 0.2 1.2 10 10 50 50 0.5 0.5 0.5 0.01

SC1_0-0.5m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.04SC1_0.5-1.0m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.05SC2_0-0.5m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.04SC2_0.5-1.0m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.04SC3_0-0.5m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.19SC3_0.5-1.0m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.1SC4_0-0.5m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.07SC5_0-0.5m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.05SC5_0.5-1.0m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.04SC6_0-0.5m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.06SC6_0.5-1.0m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.04SC7_0-0.5m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.12SC7_0.5-1.0m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.28SC8_0-0.5m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.07SC8_0.5-1.0m <0.2 <0.2 <0.2 <0.4 <0.2 <1.2 <10 <10 <50 <50 <0.5 <0.5 <0.5 0.09

Sample Naphthalene1-Methylnaphthalene2-MethylnaphthaleneAcenaphthylene Acenaphthene FluorenePhenanthreneAnthraceneFluoranthene PyreneBenz(a)anthrace

neChrysen

eBenzo(b)&(k)fluoranth

eneBenzo(a)pyre

neIndeno(1,2,3-

cd)pyreneDibenz(a,h)a

nthraceneBenzo(g,h,i)perylene Coronene

Benzo(e)pyrene Perylene

Total PAHs (as above)

Descriptionµg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg5 5 5 5 5 5 5 5 5 5 5 5 10 5 5 5 5 10 5 5 100

SC1_0-0.5m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC1_0.5-1.0m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC2_0-0.5m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC2_0.5-1.0m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC3_0-0.5m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC3_0.5-1.0m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC4_0-0.5m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC5_0-0.5m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC5_0.5-1.0m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC6_0-0.5m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC6_0.5-1.0m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC7_0-0.5m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC7_0.5-1.0m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC8_0-0.5m <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100SC8_0.5-1.0m 8 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <10 <5 <5 <5 <5 <10 <5 <5 <100


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Sample Aldrin alpha -BHC beta -BHC gamma -BHC (Lindane) delta -BHCcis -Chlordanetrans -Chlordanep,p' -DDD p,p' -DDE p,p' -DDT Dieldrin alpha -Endosulfanbeta -Endosulfan Endosulfan Sulphate Endrin Endrin ketoneEndrin aldehydeHeptachlorHeptachlor epoxideHexachlorobenzeneMethoxychlorOxychlordane*Description

µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

SC1_0-0.5m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC1_0.5-1.0m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC2_0-0.5m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC2_0.5-1.0m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC3_0-0.5m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC3_0.5-1.0m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC4_0-0.5m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC5_0-0.5m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC5_0.5-1.0m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC6_0-0.5m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC6_0.5-1.0m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC7_0-0.5m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC7_0.5-1.0m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC8_0-0.5m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1SC8_0.5-1.0m <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1


52


SAPQA/QCReporting

TheNAGDstipulatestheanalysisofqualityassurancefieldduplicatesplitsandtriplicatesamplestodeterminetheprecisionoftheanalysis.Fieldduplicatesplitsandtriplicatesampleswereanalysedtodeterminethevariationassociatedwithsubsamplehandlingandwithinlocationvariation(byrelativestandard deviation (RSD) of primary, secondary and triplicate cores). The level of acceptability is±50%. None of the RSDs exceeded the nominated acceptance criteria and data quality objective(DQO)of95%compliance.TheTablebelowsummarisestheRSDresults.

SummaryofRSDResultsExceedingAcceptableRange

Samplinglocation

QCsamples Inorganics Organics TOCMoistureContent

Duplicate Triplicate

SC6(0-0.5) QA1 QA2 48 120 3 3

SC7(0-0.5) QA3 QA4 48 120 3 3

TotalQAanalysis 144 360 9 9

TotalOutsideLimit 1 11 0 0

%Compliance 99.3% 96.9% 100% 100%

BasedontheobservedsummaryofduplicatesplitandtriplicatesampleRSDresultspresented,organics,inorganics,TOCandmoisturecontentRSDresultsreturnedatotalpercentagecomplianceabovethe95%complianceobjective.

FieldTripBlanks

Afieldtripblanksample(jarscontainingchromatographicsand)wastakenintothefieldtocomplywith theNAGD recommendation for analysis for volatile compounds andwas submittedwith thebatchofsamplestotheprimarylaboratory.ReturnedconcentrationsofTPH/BTEXcompoundswerebelowtheanalysinglaboratoryLimitofReporting(LOR).ReturnedconcentrationsofBTEXcompoundsbelow the analysing laboratory LOR indicate zero cross contamination between samples duringcollection, interim storage and final transport to the analysing laboratory. Reporting of results isconsideredacceptableandpotentiallyfreeofcrosscontaminationfromvolatilesources.


53


FieldObservationsandSedimentLogs

Plate5PC1PistonCoreSample(0–0.5m&0.5–1.0m)




54


Plate8PC4PistonCoreSample(0–0.5m)




55





56


AppendixB BathymetryWaypoint

Waypoint Easting Northing WaterDepth(m) Seabed(mLAT)

37 225344 8442271 -1.3 0.239 225295 8442295 -0.6 0.941 225240 8442320 -0.3 1.242 225368 8442317 -1.8 -0.343 225355 8442323 -1.5 0.044 225316 8442341 -1.1 0.445 225299 8442349 -0.8 0.746 225275 8442358 -0.2 1.347 225260 8442371 -0.6 0.948 225568 8442200 -2.6 -1.149 225480 8442241 -2.2 -0.750 225410 8442274 -2 -0.551 225389 8442285 -1.8 -0.352 225345 8442305 -1.5 0.053 225336 8442310 -1.8 -0.354 225326 8442315 -1.1 0.455 225315 8442321 -3 -1.556 225298 8442327 -2.5 -1.057 225291 8442330 -2 -0.558 225280 8442336 -3.8 -2.359 225271 8442341 -3.2 -1.760 225254 8442351 -2.7 -1.261 225237 8442361 -0.7 0.862 225356 8442309 -1.6 -0.163 225350 8442314 -2.2 -0.764 225328 8442329 -1.5 0.065 225320 8442335 -2.2 -0.766 225306 8442344 -1.2 0.367 225286 8442354 -2.5 -1.068 225276 8442359 -2.2 -0.769 225254 8442369 -2 -0.570 225369 8442279 -1.5 0.071 225356 8442289 -1.8 -0.372 225350 8442294 -1.3 0.273 225344 8442297 -1 0.574 225334 8442303 -0.9 0.675 225294 8442323 -0.8 0.776 225277 8442332 -3.4 -1.977 225269 8442336 -2.2 -0.778 225250 8442348 -1.2 0.3

WB2 225388 8442309 -2 -0.5WB3 225364 8442265 -1.9 -0.4


57


AppendixC MaintenanceDredgingDDSDMP

DREDGINGANDDREDGEMATERIALDISPOSAL

MANAGEMENTPLAN

WestBayBargeLandingMaintenanceDredging

Preparedfor:MungalaluTruscottAirbase

Date:15June2020


DredgingandDredgeMaterialDisposalManagementPlan

2


DrDanielSpooner;DrAdamCohen

ManagingDirectors

AustralasianMarineAssociatesPtyLtd

Suite3BTownshipDrive,BurleighHeads4221.

Mobile0404834164or0413033500

ABN:47602913762 ACN:602913762

Frontcover:AMAImageofWestBay2020.

©AustralasianMarineAssociatesPtyLtd.Allrightsreserved.

Australasian Marine Associates has prepared this document for the client identified above. The sole purpose of this

documentistoenabletheclienttoutilisethisDDMDMP,preparedbyAustralasianMarineAssociates.Nootherpartyshould

relyoraccessthis informationwithoutpriorwrittenconsentofAustralasianMarineAssociates.Thisdocumenthasbeen

preparedbasedonconfidentialinformationprovidedfromtheclient.AustralasianMarineAssociatesmayhavealsorelied

onotherinformationprovidedbythirdpartiestopreparethisdocument,someofwhichmaynothavebeenverified.Subject

totheaboveconditions,thisdocumentmaybetransmitted,reproducedordisseminatedonlyinitsentirety.


1


Contents

1.0 INTRODUCTION.....................................................................................................................1

1.1 ProjectObjectives.................................................................................................................1

1.2 StatusofDDMDMP................................................................................................................2

1.3 Planstructure........................................................................................................................2

2.0 LEGISLATIVEOVERVIEW....................................................................................................3

2.1 EnvironmentalProtectionAct1986...............................................................................3

2.2 EnvironmentProtectionandBiodiversityConservationAct1999.....................3

2.3 EnvironmentProtection(SeaDumping)Act1981....................................................4

2.4 NationalAssessmentGuidelinesforDredging..........................................................4

2.5 AcidSulfateSoilsGuidelines.............................................................................................4

2.6AustralianandNewZealandGuidelinesforFreshandMarineWaterQuality...4

2.7 AboriginalHeritageAct1972...........................................................................................5

3.0EXISTINGENVIRONMENT..................................................................................................6

3.1 Existingsedimentdata........................................................................................................6

3.2 Existingenvironment..........................................................................................................6

4.0 DREDGINGANDDREDGEMATERIALPLACEMENT....................................................9

4.1 Proposedworks....................................................................................................................9

4.2 Dredgingworks.....................................................................................................................9

4.3 Disposal/ReclamationManagement.........................................................................10

5.0 POTENTIALIMPACTSANDMITIGATIONMEASURES.............................................12

5.1 Potentialimpacts...............................................................................................................12

5.2 Objectives.............................................................................................................................12

5.3 Generalmanagementmeasures...................................................................................12

5.4 Dredgeoperationmanagementmeasures................................................................13

5.5 Onshoredredgematerialmanagementmeasures.................................................13

5.6 PASSManagement.............................................................................................................14

6.0ENVIRONMENTALEMERGENCYANDINCIDENTMANAGEMENT.......................15

6.1 Objectives.............................................................................................................................15

6.2 Performancecriteria........................................................................................................15

6.3 Managementmeasures....................................................................................................15


2


6.4 Correctiveactions..............................................................................................................15

7.0REPORTINGANDMONITORING...................................................................................16

8.0REFERENCES.......................................................................................................................17


1


1.0 INTRODUCTION TheWestBayBargeLandingislocatedapproximately7kmeastoftheMungalaluTruscottAirbase,in

theKimberleyRegion.MungalaluTruscott isapproximately520kmwestsouthwestofDarwinand

617kmnortheastofBroomeand is locatedontheAnjoPeninsulaonthenortherntipofWestern

Australia(Figure1).

ThisDredgingandDredgeSpoilDisposalManagementPlan(DDMDMP)hasbeenpreparedtoaddress

theenvironmentalmonitoringanddredgemanagementrequirementsformaintenancedredgingand

dredgespoildisposalworks forWestBayBargeLandingMaintenanceDredging.Thedredgingand

materialdisposalactivitiesinclude:

• Dredgingofapproximately22,000m3,andaconservativebulkingfactorof10%(i.e.basedon

materialbeing99%sand,gravelandboulders),upto24,200m3ofbulkedmaterial;and

• Disposalofdredgematerialwithintheproposedplacement/nourishmentarea.

Thedredgingworkswillincludedredgingofapproximately0.5to1.5mbelowseabed,usingalong

reachexcavatoronafloatingbarge(Figure5).Thematerialwillbeplacedintoabargeandtransported

toanuplandconfineddisposalfacilitylocatedbehindtheexistingaccessareafortheBargeLanding.

Figure 1 West Bay Barge Landing (referenced from Google Earth pro).

1.1 ProjectObjectivesThe objective of the DDMDMP will be to identify the performance criteria and the actions and

procedurestobefollowedtoachievethefollowing:

• Managingimpactsofdredgingonmarinefloraandfaunaandwaterquality;

• Minimisingimpactsonthemarineenvironment;

WestBayBarge

Landing

Kimberley

Region


2


• Minimisingturbidityandsedimentresuspension,wherepossible;and,

• Avoidingincidentsandimpactsfromdredgevesseloperations.

1.2 StatusofDDMDMPThis DDMDMP provides a basis for the minimum requirements for managing the maintenance

dredging of approximately 22,000 m3 of dredge material at the West Bay Barge Landing. This

DDMDMPmay need to the refined further once the final dredgingmethodology is defined. This

DDMDMPaddressesthedredginganddredgematerialplacementactivitiestobeundertakenaspart

ofthemaintenancedredgingrequiredtomaintainnavigableaccesstotheBargeLanding.

1.3 PlanstructureThisPlanadoptsanadaptiveapproachfortheenvironmentalmanagementofdredginganddredge

materialtominimiseenvironmentalharmandachievethelevelofEnvironmentalProtectionrequired

bytheregulatoryagencies.

ThePlanisstructuredasfollows:

• Section2providesahigh-leveloverviewofthelegislationrelatedtoproject;

• Section3detailstheexistingenvironment,includingmarinefloraandfauna;

• Section4presentstheproposeddredginganddisposalactivities;

• Section5discussesthepotentialimpactsandmanagementmeasures;

• Section6providesanoverviewoftheemergencyandincidentresponseprocedures;and,

• Section7detailsthereportingandmonitoringrequirementsforthisPlan.


3


2.0 LEGISLATIVE OVERVIEW Allproposeddredgingandreclamationactivitieswillbeundertakenincompliancewiththerelevant

Commonwealth,StateandRegionallegislativerequirements,including:

• EnvironmentalProtectionAct1986(WA;EPAct);

• EnvironmentProtectionandBiodiversityConservationAct1999(Commonwealth);

• EnvironmentProtection(SeaDumping)Act1981(Commonwealth);

• NationalAssessmentGuidelinesforDredging(NAGD;CA2009);

• AcidSulfateSoilsGuidelinesSeries(DER2015);

• AustralianandNewZealandGuidelinesforFreshandMarineWaterQuality

(ANZECC/ARMCANZ2000);and

• AboriginalHeritageAct1972(WA).

2.1 EnvironmentalProtectionAct1986TheEnvironmentalProtectionAct1986(WA)(EPAct)isthekeylegislationgoverningtherequirement

forenvironmentalprotectionandmanagementinWAincludingtheassessmentoftheenvironmental

impactsofanyproposedworksincludingmaintenancedredging.TheEPAct(mainlyPartIV)defines

therequirementforenvironmentalimpactassessmentofproposeddevelopmentsinWA.

The approach taken by the EPA during the EIA process has been documented by the EPASU in a

numberofEnvironmentalFactorGuidancedocuments,formerlyknownasEnvironmentalAssessment

Guidelines(EAGs).EachEnvironmentalFactordefinedintheStatementofEnvironmentalPrinciples,FactorsandObjectives(EPA2016c)hasacorrespondingguidancedocument.Thefactorsidentifiedas

beingrelevanttothisProjectareoutlinedSection3.

UnderSection38(1)oftheEPAct(PartIV),whereaproposedprojectdevelopmentislikelytohavea

significanteffectontheenvironment,theproponentmustrefertheproposaltotheEPAforadecision

on whether it requires formal environmental impact assessment, and if so, at what level of

assessment.TheDoTwillrefermaintenancedredgingprojectstotheEPAiftheyareanticipatedto

potentially have a significant effect on the environment and no environmental approvals have

previously been obtained. Itmay also be appropriate to refer a project if there is a high level of

community/stakeholderconcern.

2.2 EnvironmentProtectionandBiodiversityConservationAct1999If the maintenance dredging project is likely to have a significant impact on matters of national

environmentalsignificance(MNES)itwillrequireassessmentbytheDepartmentofEnergyandthe

Environment)DotEEundertheEnvironmentProtectionandBiodiversityConservationAct1999(EPBCAct).

EnvironmentalmattersofnationalsignificancearedefinedbytheEPBCActas:

• listedthreatenedspeciesandecologicalcommunities

• migratoryspeciesprotectedunderinternationalagreements

• Ramsarwetlandsofinternationalimportance

• theCommonwealthmarineenvironment

• theGreatBarrierReefMarinePark


4


• WorldHeritageproperties

• NationalHeritageplaces

• nuclearactions.

ItisnotanticipatedthatthemaintenancedredgingwillhaveasignificantimpactonanyMNES(see

Section3)andAMA(2020),therefore;referralundertheEPBCActisnotanticipated.

2.3 EnvironmentProtection(SeaDumping)Act1981TheEnvironmentProtection(SeaDumping)Act1981appliestothedisposalofcontrolledmaterialin

AustralianWatersotherthanwaterswithinthelimitsoftheStateorInlandWaters.TheNAGD(CA

2009)defineswaterswithinthelimitsofaStateasthosewatersthatliewithintheconstitutionallimits

oftheStateandincludefeaturessuchasbays,gulfs,estuaries,inlets,portsandharbours.

Disposal of dredgedmaterial is proposed to occur above high-watermark hence no sea dumping

permitwillberequiredundertheEnvironmentalProtection(SeaDumping)Act1981.

2.4 NationalAssessmentGuidelinesforDredgingThe NAGD (CA, 2009) provide a framework for the review and assessment of ocean disposal of

dredgedmaterialinsupportoftheEP(SeaDumping)ActandtheEPBCAct.Althoughoceandisposal

isnotproposedforthedredgematerial,theguidelinesprovidesabasisforclassifyingthesuitability

forunconfinedoffshoredisposal.

Assessmentofsuitabilityfordisposalonshoreisconsideredbycomparingvaluestothemarineinterim

sedimentqualityguidelineswhichareequivalenttotheNAGD(CA,2009)ScreeningLevelsandthe

ANZG(2018)InterimSedimentQualityGuidelines(ISQG).

2.5 AcidSulfateSoilsGuidelinesTheproposedmaintenancedredgingisoccurringwithinanopenembayment,wheresedimentsare

predominantly sandwithminor silt butwhich is also located adjacent to a smallmangrove lined

creek.Theremaybeenvironmentalrisksassociatedwithacidsulfatesoils(ASS).Thedisturbanceof

ASScanincreasepHlevelsandacidity,andcausemobilisationofmetalsintothewatercolumn.The

AcidSulfateSoilsGuidelinesSeries(DER2015)containsguidanceonhowtoidentifyASSriskareasand

thesubsequentassessmentmethods,includingsamplingandreportingformaterialintendedforland

reclamationpurposes.TheseguidelinesoutlineariskassessmentapproachforASSundertheCSAct.

2.6 Australian and New Zealand Guidelines for Fresh and Marine WaterQuality

Dredginghasthepotentialtocausethereleaseofcontaminants intothewatercolumnandwithin

returnwaterfromdisposalofdredgedmaterial.Theassessmentofpotentialduringdredgingwater

qualityimpactsisbycomparisonofthepotentialcontaminantsofconcern(PCOC;ofelutriatesample

concentrationsoftheproposedmaterialpriortodredgingand/orofthereturnwaterconcentrations

duringdredging)toANZG(2018)triggervaluesforphysicalandchemicalstressorsandtoxicants.

Asthesedimentstestedarechemicallyclean,thepotentialforreleaseofcontaminantsintothewater

columnisconsideredverylowandwasnotconsideredfurther.However,theassessmentofturbidity

andsedimentationisalsoconsideredwithinSection5.


5


2.7 AboriginalHeritageAct1972Dredging activities have the potential to disturb sites of Aboriginal Heritage significance. TheWA

DepartmentforAboriginalAffairsmaintainaregisterofover22000AboriginalHeritagesites(which

can includeartefacts, engravings, paintings,mythological or ceremonial places) inWAwhichhave

beendefinedundertheAboriginalHeritageAct1972(AHAct).IfevidenceofAboriginalHeritageislocatedduringtheassessmentorimplementationofaprojectdevelopment,itmustbereportedto

theRegistrarofAboriginalSitesundertheAHAct.

TheairbaseisunderthetraditionalownershipoftheWunambalGaamberapeopleandismanaged

underleasebyMungalaluTruscottAirbasePtyLtd.


6


3.0 EXISTING ENVIRONMENT 3.1 ExistingsedimentdataAgeochemical investigationwasundertakenbyAMAattheproposeddredgingsitelocation(AMA,

2015). Piston core samples were collected at eight locations distributed within the proposed

maintenancedredgingarea.

The samples were collected up to 1 m below the seabed. The particle size distribution analysis

indicated that the majority of the material to be dredged consisted of loose sands. Most cores

containedalargeproportionoffineandmediumgrainedsand(averageor82.6%and79.7%insurface

andsub-surfacestratarespectively)andgravel,withveryminorpercentagesofsilt/clay(averageor

0.6%and0.7%insurfaceandsub-surfacestratarespectively).Thisisimportant,asitisthefinergrainer

material(silt/clay)thathasthegreatestpotentialtoremaininsuspensionandcreateturbidplumes

thatpersistsandspreadmorebroadly.

The chemical analysis of all samples confirmed that the material was not contaminated and in

accordance with NADG (2009), is suitable for onshore disposal at the proposed placement/

renourishmentsite.

Thechemicalanalysisofthesampleshowever,did indicatethatsomesamplescontainedPotential

Acid Sulphate Soils (PASS). The proposed monitoring program undertaken during dredging and

disposalactivitieswillconfirmthequantitiesandintensitiesofthePASS,andmanagementmeasures

willbeadoptedaccordingly.Inthefirstinstance,limingisproposedforthematerialwherePASSwas

reportedduringsampling(i.e.SC1,SC4andSC8).

3.2 ExistingenvironmentAsiteassessmentcombinedwithadesktopreviewoftheexistingdatawereutilisedtocharacterize

thelandbasedflorapresentinthevicinityoftheprojectsite.AsitesurveyconductedbyDECin2008

describedthelocalcoastalvegetationasfollows:

“MangrovecommunitiesarecommonalongtheshoresofNapierBroomeBay,includingintidalcreekmouthsandonelevatedintertidalrockyplatforms.InthenearshoreofNapierBroomeBay,sandstonereefsarecommonandcouldbegenerallyclassifiedasalgaldominated reefswith thenumberanddiversityofcoralcoloniespresentbeinglow,buttendingtoincreasetowardsthetipofthePeninsulaandoffshoresuchasaroundLouisIsland.BroadareasofbaresandandsandysedimentsthatsupportpatchysparsetomediumdensitycommunitiesoffilterfeedersalsooccurinNapierBroomeBay.Atthebroadestlevel,thedominanthabitattypeofsedimentarydeeperareasofNapierBroomeBay(>10m)couldbegenerallyclassifiedasfine,bioturbatedsedimentwithoccasionalsparsedensityfilterfeedingcommunities.”(DEC,2008)

Themangrovecommunitiesapproximately100mnorthoftheBargeLandingwererelativelydense

and lined the entire foreshore (AMA, 2015). The species Sonneratia alba, Avicennia marina,Rhizophora stylosa and Ceriops tagal were reported within the intertidal zone. The mangrove

communityapproximately100msouthoftheBargeLandingcontainedalessdensecommunity,with

someisolatedstandsofmangroveoccurringintertidally(AMA,2020)(seeFigure2).


7


Figure 2 Foreshore south of the Barge Landing.

Marineenvironmental investigationswerealsoperformed inareassurroundingtheBargeLanding.

Thefollowingparagraphsprovideasummaryofkeyfindings(AMA,2020):

• Towedvideoanddropcamerasurveyswereundertakenintheprojectareainordertoidentify

andcharacterise theexistingmarineenvironment.The investigationof theproposeddredging

area, including the batter slopes, and alsowithin subtidal areas adjacent to the dredge area,

includedsubtidalreefcommunitiesupto1kmfromthedredgefootprint.

• The towed video and drop camera imagery collected at the Barge Landing provided insight

regardingthetopography,substratetypesandbenthichabitatpresent. Approximately50mto

200meastofthebargelanding,theseabedconsistedofsoftsand,withbioturbationpresent.At

approximately50moutfromthelanding,theseabedcontainedahigherproportionofdarkgrey

siltymaterial.

• Within 50m of the barge landing, the substrate changed significantly. Large boulders were

reported throughout the area, covered in fine siltmaterial (see Figure 3). Some growthwas

reportedontheboulders,namelysponges.Debriswasalsoreportedthroughout,whichincluded

rope,theoriginalfoundationmaterialfromthebargelanding(i.e.grates)andconcrete.


8


Figure 3 Large boulders with sponge growth within 50m of the barge landing.

Thefarthestinshorereefreportedduringthissurveyworkwaslocatedapproximately1kmSouthof

the project area. The seabed consisted of soft sandy bed, dominated by the greenmacroalgae,

HalimedaandalsomacroalgalbedsdominatedbySargassumandPadina. Gianttrevallywerealsonotedduringthesurveywork(AMA,2020).

Approximately500msouthofthebargelandingcontainedareasofsoftsandyseabedhabitatandalso

rockyreef,containingencrustingcorallinealgae,wereidentified.Thepresenceofbrownmacroalgae,

PadinaandSargassumwasalsonoted(AMA,2020).

Approximately250mnortheastofthebargelandinglargeareasofmodifiedrockyreefwereidentified.

Thepresenceofdeadcoral,Poritesandsomeareasofencrustingcorallinealgaeandspongeswere

noted.Asignificantamountoffinesedimentwasreportedonandaroundtheseareasofrockyreef

(AMA,2020).

Attheinshorereefslocatedapproximately300metresnortheastoftheBargeLandingthecommunity

wasdominatedbyamacroalgalcommunitypresentonrock,andwasdominatedbySargassumand

Padina.Onthesoftsandyseabed,thegreenalgaHalimedawasidentified.Cardinalfishwereobserved

in and around themacroalgal beds. The nearshore reefs, 500m to 1000mnortheast of the Barge

LandingcontainedasimilarmosaicofsandyseabeddominatedbyHalimedaandalsorockyreefandmacroalgal beds. These reefs also contain a variety of fish and invertebrate fauna, including

nudibranchs(AMA,2020).

Thefarthestoffshorereefs,approximately3kmfromthebargelandingand1kmfromtheoffshore

materialground,containedareasofbaresandyseabedandlowprofilereef,dominatedbybrownand

redmacroalgalassemblages(AMA,2020).


9


4.0 DREDGING AND DREDGE MATERIAL PLACEMENT 4.1 ProposedworksThe proposedworks consist ofmaintenance dredging to re-establish a navigable depth for barge

accessintothelandingfacility(i.e.-0.5mLAT)(seeFigure4).Currentsurveyoftheareaindicatesthatexcavationofapproximate0.5metreto1.5metrewillbenecessary,inordertoachievetherequired

depths.Excavationbattersnotsteeperthan1verticalto4horizontalarerecommendedfortheupper

alluvialsandslocatedabovethetargetdepthwithintheprojectfootprint.Dredgingofapproximately

22,000m3isrequired.

Figure4Maintenancedredgingarea(AMA,2015).

4.2 DredgingworksThebackhoedredge(BHD)willbeutilisedtoremovethedredgematerial.Thebackhoedredgewill

beequippedwitha30 tonneexcavatororequivalentandsupportedbyadumbbarge for loading

extractedmaterial (Figure5). The long reachcapacity largeexcavatorproposed for theworkswillallowtherequireddredgingdepthstobeeasilyachievedandwillminimisethepotentialforturbid

plumestobecreated.

TheBHDisastationaryplantanchoredbythreespuds,twofixedatthefrontandonemoveablespud

locatedattherearofthepontoon.SupportvesselswillassisttomovethebargesandtheBHD.Once

the BHD is in position, the spuds are lowered to provide sufficient anchoring. The excavation is

executedbyloweringtheexcavatorbuckettotheseabedusingtheboomandstickhydrauliccylinders.

Theexcavator is locatedontopofaturntableatthefrontofthepontoon,allowingittoreachthe

dredgingmaterialandplace it into thebarges. Once theaccessiblematerial is removed, theBHD


10


movestothefollowingstepusingthemovingspud.Thedistancetothenextstepisdefinedbythe

materialcharacteristics,bucketvolumeandsticklength.

Figure5Exampleofa30-tonnelongreachexcavatoranddumbbarge.

4.3 Disposal/ReclamationManagementThematerialwillbebroughttoshoreandplacedintothepredeterminedplacementarea(Figure6).Thetotalareaof theplacement/nourishmentsite isapproximately8,000m

2.Withaconservative

bulkingfactorof10%(i.e.basedonmaterialbeing99%sand,gravelandboulders),upto24,200m3of

bulkedmaterialwillbeplacedwithintheplacementarea(approximately2mto3mhigh).

Followingtheexcavationworks,thedredgedmaterialwillbeplacedontopofabargeuntilitreaches

itscapacity.Thebargewillthenbetowedtothebargerampandthematerialwillbetransportedby

dumptrucktoitsfinallocation.AbundwallwillbeconstructedaroundthePlacementSite,whichis

3mhigh,tocontainanypotentialrunoffoffinesfromthesite.


11


Figure 6 Proposed material placement/ nourishment area.


12


5.0 POTENTIAL IMPACTS AND MITIGATION MEASURES 5.1 PotentialimpactsAninvestigationintothepotentialimpactsofthedredgingworkshasbeenundertakenbasedontheprojectfootprint,dredgingmaterialcharacteristicsandproposedmethodology.Thepotentialimpactsfromdredginganddredgematerialdisposalactivitiesinclude:

• Modifyingexistingwaterqualityconditionsfromincreasedturbidity;• Smotheringofreefhabitat;and• Increasedsedimentationwithintheadjacentmangrovecommunity.

Thedredgingplanwasestablishedwithconsiderableemphasisonenvironmentalperformance,andtheproposedexecutionoptimisedtoarriveatthefinalmethodologypresentedinthisPlan.

5.2 ObjectivesIn order tominimise the impacts on the existing marine environment surrounding the proposeddredging works area, the proposed methodology will aim to minimise the turbidity generatingactivitiesandincludesamonitoringregimewhichwillenableadaptationofthedredgingworksastheprojectprogress.

5.3 GeneralmanagementmeasuresThevisualmonitoringoftheplumessurroundingthedredgingactivityareawillbedocumentedbythespotteronboardtwiceaday.TheapproachtomonitoringoftheplumesisincludedinAppendixA.Thedredgingcontractorisresponsibleforcompletingthedailyfieldlog,whichincludesdocumentingtheextentofthedredgeplumes,aswellastheprevailingweatherconditions.

The continuous monitoring of the plumes will dictate the development of the dredging relatedactivities.InthecaseoftheplumeextendingoutsidetheZoneofHighImpact,theplumemonitoringfrequencywillbeadjustedtoensuremanagementmeasuresareinplaceeffectively.TheextensionoftheplumestotheareasoutsideoftheZoneofModerateImpactisexpectedonparticularoccasions,however, iftheplumeintensity,durationandlocationarelikelytocreatedetectibleimpactontheenvironment,thedredgingactivitieswillbemodifiedtoensuretheimpactisminimised.

Management measures consist of a variety of actions which can take place to minimise theenvironmentalimpactcausedbythedredgingworks,consideringthedredgingactivities,equipmentlocationandtimingof theproposedactions.As the local tideregimecanpresentvariations in theorderof2–5metres,theperiodsofspringtidesarenaturallyassociatedtoanincreaseinturbidityinthewatercolumn.

Equipmentmaintenanceanddredgingofareaswith lower fines content canbe scheduled to takeplaceduringthesaidperiods,minimisingtheturbidityincreasecausedbythedredgingactivities.Thelocationof thedredgingequipmentcanalsobemanaged tomake themostof the tidal variation,minimizing theexcavationandtransport in thewatercolumn.Themanagementof theequipmentlocationandsequenceoftheareastobedredgedcanpossiblyimprovetheproductivity,reducingthedurationoftheworksandsubsequentimpactontheadjacentenvironments.


13


5.4 Dredgeoperationmanagementmeasures Thedredgingworkswillinvolvetheexcavationofsedimentsbetween0.5mto1.5mbelowthecurrentseafloor level and subsequent disposal within the dredge material placement area. Prior to themobilisationofdredgingequipment,aninspectionwilltakeplacetoensureallmachineryisfitfortheproposedworks.Allhydraulicconnectionsneedtogetcheckedinregardtoitsconditionstopreventfailureduetowearandtearpriortomobilizationtotheprojectsite.Appropriateemergencyresponsekitsshouldbeonboardtominimizeenvironmentaldamageincaseanoilleakoccurs.

A localised increase in turbidity is expected during the dredging operations. The suspension ofsedimentswilloccurduringtheexcavationworksandloadingontothebarge.Inordertominimisesedimentsuspension,thedredgingsequencewillfollowthedredgeplanprocedures,avoidexcavationworksduringcertaintimes(i.e.springtides)andavoidbargeloadingduringextremewindspeeds(i.e.>30knots).

Theextentandintensityoftheturbidityplumewillbecloselymonitoredtoensuretheimpacttotheenvironmentiskepttoaminimum.Continuousvisualmonitoringofthedredgingplumewillassistthemanagementofthedredgingactivities.

TheZoneofHighImpact,whereirreversibleimpactscanoccur,islikelytobelimitedtotheareasofmangrove100mnorthandsouthoftheBargeLandingandtheoffshorereefs,250mto300mnortheastofthe landing.Thisassumption isbasedonthefactthatthevastmajorityoftheproposeddredgematerialissand,withveryminorclay/siltcontributions.TheZoneofModerateImpactislikelytobelocatedaroundthedredgingfootprintandextendsforapproximately50m,surroundingthedredgingfootprint.Nomajorsensitiveenvironmentalreceptorsarelocatedwithinthemoderateimpactzoneandnoirreversibleenvironmentalimpactsareexpectedtooccurinsidethisarea.

The monitoring of the turbidity plume extension will occur during the duration of the dredgingactivities.AgeoreferencedmapincludingtheaerialpictureoftheprojectsiteanditssurroundingswillbeavailablefortheSiteManagerwhowill identifytheplumelocationandtheweatherconditions.Theseobservationswilltakeplacetwiceaday,andaplotofalltheareasaffectedbytheplumeswillassisttoconfirmtheextensionoftheactualZoneofInfluenceagainsttheassumeddredgeplumesextents.NodetectibleimpactonthebiotaisexpectedwithintheZoneofInfluence.Thisassumptionisbasedonthenatureofthedredgematerial,small-scaleplantinvolvedandthesmallscaledurationofthework(i.e.maximumof2months).

Avisualassessmentoftheplumewillbedocumentedtoassistthedredgingcontractorwithmanagingthedredgingworks.(seeAppendixA).TheoutcomesofthemonitoringwillbereportedtoMungalaluTruscottAirbase,togetherwithanymanagementactionstakentoreducetheintensityandextentofturbidplume.

5.5 OnshoredredgematerialmanagementmeasuresThedredgematerialwillbeplacedwithintheproposedDredgeMaterialPlacementSite.Duringthedredging,handlingandtransportbylandbasedearthmovingmachinery,anymoisture/watercontentwillbereducedwitheachstage,allowingtheplacementofthedredgematerialwithverylittlerunoff.To minimize potential airborne sediment loss, the loading/unloading operation should not beconductedwhenthewindspeedexceeds30knots.


14


Toavoidlossoffinestotheenvironment,thebundwallsshouldbeofsufficientwidthandheight(i.e.3mhigh)totrapthefines.Nofreeflowingrunoffisexpected.ThedredgedmaterialwillbedisposedwithinthePlacement/NourishmentSite,builtontheareaadjacenttothedredgingfootprint,onthenorthwestsideofthebargeramp.Theplacementareabundwillbesufficientlystabletoensurethefillmaterial is accommodatedwithin thebundwalls. In order to trap the fines appropriately, andwhereappropriate,acombinationoflayercompactionandplacementofgeotextilematerialmayberequired.

5.6 PASSManagementWhilstPotentialAcidSulphateSoils(PASS)weredetectedinsomeofthesoilsamples,theintensityand spatial locations did not indicate wide spread problematic conditions with the potential forsignificantacidgeneration.Regardless,thepresenceofPASSneedstobeconsideredinaccordancewiththeWesternAustralianDepartmentofRegulations(DER,2015).

FollowingplacementofthedredgematerialatthePlacementSite,itisrecommendedtoundertakeField pH Peroxide Testing (pHFOX) specifically targeting thematerial where PASSwas previouslydetected(i.e.SC8)andwhererequired,samplescollectedandtestedforSPOCASanalysisandlimemixedintothedredgematerialatasuitablerate,tobespecifiedbythelaboratory.


15


6. 0 ENVIRONMENTAL EMERGENCY AND INCIDENT MANAGEMENT

6.1 ObjectivesTheobjectivesofenvironmentalemergencyandincidentmanagementinclude:

• Identifytherelevantauthorities(i.e.EnvironmentalProtectionAuthority)tobecontactedintheeventofanemergencysituation;and

• Identify appropriate actions to be undertaken in case of an environmental emergency orincident.

6.2 Performancecriteria• Incident procedures and controls are in place, which include having oil spill containment

equipmentonsite;• Emergencysituationsarerespondedtoinatimelymanner;• Appropriateauthoritiesarenotifiedintheeventofanemergency;and• Environmentalharmresultingfromanincidentisminimised.

6.3 ManagementmeasuresMungalaluTruscottAirbasewillimplementthefollowingmeasures:

• Trainingwillbeprovidedtoallpersonnelformonitoringthedredgeplumes, inaccordancewithAppendixA;and

• Environmentalincidentcontrolswillbeonthedredgeequipment.

6.4 CorrectiveactionsThefollowingcorrectiveactionswillbeimplementedasrequired:

• Intheeventofanenvironmentalincident,effectiveemergencyresponsemeasuresshallbeimplementedinatimelymanner,within24hours;

• Incidentformswillbefilledout(seeAppendixB)andremedialactionsnominated;and• Mitigationmeasureswillbeimplementedtoreducethelikelihoodofanotherincident.


16


7.0 REPORTING AND MONITORING Periodic reports containing results of the qualitative monitoring program and showing theperformanceoftheconstructionworksandanymitigationmeasuresappliedwillbesubmittedtotheWesternAustralian Environmental ProtectionAuthority. Thesewill also provide an update on theprogress of theworks. Additionally, incident andnon-compliance reportswill be submitted if andwhenrequired.


17


8.0 REFERENCES AMA(2015)SedimentSamplingandAnalysisPlanImplementationReport-WestBayBargeLanding.PreparedforMungalaluTruscottAirbase,WesternAustralia.AMA (2020). Dredge Maintenance Marine Environmental Impact Assessment – West Bay BargeLanding.PreparedforMungalaluTruscottAirbase,WesternAustralia.DER(2015)Treatmentandmanagementofsoilandwaterinacidsulfatesoillandscapes.DepartmentofEnvironmentalRegulations.WesternAustralianGovernment.DER2015001427,June2015.

DEC(2008)PreliminaryreconnaissancesurveyofbenthichabitatsintheAnjoPeninsulaarea,KimberlyBioregion,WesternAustralia.WesternAustralianDepartmentofEnvironmentConservation–MarineEcosystemsBranch.PreparedfortheNorthernDevelopmentTaskforce

NationalAssessmentGuidelinesforDredging,CommonwealthofAustralia,Canberra,2009.


18


AppendixA FieldReportingSheet


19


AppendixB IncidentReporting


20


INCIDENT AND INJURY REPORT

Details of incident (eg to a worker or visitor) and treatment

Date of incident

Time of incident am pm

Nature of incident Near miss First aid Medical treatment/doctor

Name of injured person

Address

Occupation

Date of birth

Telephone

Employer

Activity in which the person was engaged at the time of injury

Exact site location where injury occurred

Nature of injury – eg fracture, burn, sprain, foreign body in eye

Body location of injury (indicate location of injury on the diagram)

Treatment given on site Name of treating

person

Referral for further

treatment?

Yes No

Name of doctor or hospital WorkCover medical

certificate received?

Yes No

Attach copies

Injury management

required?

Yes No

Notify return to work coordinator Name of return to work

Coordinator


21


Witness to incident (each witness may need to provide an account of what happened)

Witness name Witness contact

Witness name

Witness contact

Description of incident

Immediate response actions (eg barricades, isolation of power) to stabilise the situation

Reported to

Reported to principal contractor?

Yes No

Provide details (when, reported to and reported by):

Reported to authorities

(WorkCover phone: 13 10 50)?


Details of incident (eg property, plant or environmental damage)

Date of incident Time of incident am pm

Location of incident

Details of damage to

Equipment or property

Name of person who Telephone

Received the report


22


Yes No

Reported to principal contractor?

Yes No


Reported to workers compensation

insurer?

Yes No


Completed by

Name Position

Signature Date


23


AppendixC WindData(ExampleProvided)


24



25



26


AppendixD TidePredictionBOM(ExampleProvided)


58


AppendixD WestBayMaintenanceDredgingEnvironmentalFactorsSummary

FACTOR OBJECTIVESurveysandInvestigations

POTENTIALIMPACT(S) MANAGEMENT

BenthicCommunitiesand

Habitat

Tomaintainthe

structure,function,

diversity,distribution

andviabilityofbenthic

communitiesand

habitatsatlocaland

regionalscales.

ProposedMarineEcology

Survey

Removalandsmothering

ofbenthiccommunities

Characterisethemarine

benthiccommunitieswithin

thevicinityofthedredge

footprintandspoildisposal

location/s.

CoastalProcesses Tomaintainthe

morphologyofthe

subtidal,intertidaland

supratidalzonesandthe

localgeophysical

processesthatshape

them.

PreliminaryFeasibility

Study,WestBayBarge

Landing2014

ProposedBathymetry

Survey

Changestolocal

hydrodynamicand

sedimenttransport

processes

Selectasuitabledredge

materialdisposallocation

onshoreduringthe

proposedmarineecology

study.

MarineEnvironmentalQuality Tomaintainthequality

ofwater,sedimentand

biotasothatthe

environmentalvalues,

bothecologicaland

social,areprotected.

ProposedSediment

SamplingandAnalysis

Plan

Proposed

Characterisationof

DredgePlumeIntensity

Resuspensionof

potentiallycontaminated

sediments

Modificationtoexisting

waterqualityand

Characterisationofdredge

material.


59


FACTOR OBJECTIVESurveysandInvestigations

POTENTIALIMPACT(S) MANAGEMENT

andExtent,Water

Quality,DrogueStudy

andSettlingTimein

SeawaterTests

impactsonsensitive

environmentalreceptors

Understandtheintensity

andfateofthedredge

plumes.

MarineFauna Tomaintainthediversity,

geographicdistribution

andviabilityoffaunaat

thespeciesand

populationlevels.

ProposedCoastal

VegetationandMarine

EcologySurvey

Potentialimpactto

fisheries(mangrove)

habitat.

Potentialimpactto

marinefaunafrom

modificationstowater

qualityconditions.

Characterisethemarine

floraandfauna

communitieswithinthe

vicinityoftheBarge

Landing.

Determinethepotentialfor

dredginganddredge

materialdisposaltoimpact

onmarinefauna.


60


AppendixE ProtectedMattersDatabase

EPBC Act Protected Matters ReportThis report provides general guidance on matters of national environmental significance and other mattersprotected by the EPBC Act in the area you have selected.

Information on the coverage of this report and qualifications on data supporting this report are contained in thecaveat at the end of the report.

Information is available about Environment Assessments and the EPBC Act including significance guidelines,forms and application process details.

Other Matters Protected by the EPBC Act

Acknowledgements

Buffer: 1.0Km

Matters of NES

Report created: 10/06/20 14:40:59

Coordinates

This map may contain data which are©Commonwealth of Australia(Geoscience Australia), ©PSMA 2010

CaveatExtra Information

DetailsSummary

http://www.environment.gov.au/protection/environment-assessments

Summary

This part of the report summarises the matters of national environmental significance that may occur in, or mayrelate to, the area you nominated. Further information is available in the detail part of the report, which can beaccessed by scrolling or following the links below. If you are proposing to undertake an activity that may have asignificant impact on one or more matters of national environmental significance then you should consider theAdministrative Guidelines on Significance.

Matters of National Environmental Significance

Listed Threatened Ecological Communities:

Listed Migratory Species:

None

Great Barrier Reef Marine Park:Wetlands of International Importance:

Listed Threatened Species:

None

31

1None

National Heritage Places:

Commonwealth Marine Area:

World Heritage Properties:

None

None

47

The EPBC Act protects the environment on Commonwealth land, the environment from the actions taken onCommonwealth land, and the environment from actions taken by Commonwealth agencies. As heritage values of aplace are part of the 'environment', these aspects of the EPBC Act protect the Commonwealth Heritage values of aCommonwealth Heritage place. Information on the new heritage laws can be found athttp://www.environment.gov.au/heritage

This part of the report summarises other matters protected under the Act that may relate to the area you nominated.Approval may be required for a proposed activity that significantly affects the environment on Commonwealth land,when the action is outside the Commonwealth land, or the environment anywhere when the action is taken onCommonwealth land. Approval may also be required for the Commonwealth or Commonwealth agencies proposing totake an action that is likely to have a significant impact on the environment anywhere.

A permit may be required for activities in or on a Commonwealth area that may affect a member of a listed threatenedspecies or ecological community, a member of a listed migratory species, whales and other cetaceans, or a member ofa listed marine species.


NoneNone12

Listed Marine Species:Whales and Other Cetaceans:

78Commonwealth Heritage Places:

NoneNone

Critical Habitats:

Commonwealth Land:

Commonwealth Reserves Terrestrial:NoneAustralian Marine Parks:

Extra InformationThis part of the report provides information that may also be relevant to the area you have nominated.

None

1State and Territory Reserves:

Nationally Important Wetlands:

NoneRegional Forest Agreements:Invasive Species: 7

NoneKey Ecological Features (Marine)

http://www.environment.gov.au/protection/environment-assessments

http://www.environment.gov.au/epbc/permits-and-application-forms

Details

Listed Threatened Species [ Resource Information ]Name Status Type of PresenceBirds

Red Knot, Knot [855] Endangered Species or species habitatmay occur within area

Calidris canutus

Curlew Sandpiper [856] Critically Endangered Species or species habitatmay occur within area

Calidris ferruginea

Red Goshawk [942] Vulnerable Species or species habitatmay occur within area

Erythrotriorchis radiatus

Gouldian Finch [413] Endangered Species or species habitatlikely to occur within area

Erythrura gouldiae

Crested Shrike-tit (northern), Northern Shrike-tit[26013]

Vulnerable Species or species habitatlikely to occur within area

Falcunculus frontatus whitei

Partridge Pigeon (western) [66501] Vulnerable Species or species habitatlikely to occur within area

Geophaps smithii blaauwi

Bar-tailed Godwit (baueri), Western Alaskan Bar-tailedGodwit [86380]

Vulnerable Species or species habitatmay occur within area

Limosa lapponica baueri

Northern Siberian Bar-tailed Godwit, Bar-tailed Godwit(menzbieri) [86432]

Critically Endangered Species or species habitatmay occur within area

Limosa lapponica menzbieri

Eastern Curlew, Far Eastern Curlew [847] Critically Endangered Species or species habitatmay occur within area

Numenius madagascariensis

Australian Painted Snipe [77037] Endangered Species or species habitatlikely to occur within area

Rostratula australis

Masked Owl (northern) [26048] Vulnerable Species or species habitatlikely to occur within area

Tyto novaehollandiae kimberli

Mammals

Blue Whale [36] Endangered Species or speciesBalaenoptera musculus

National Heritage Properties [ Resource Information ]Name StatusStateNaturalThe West Kimberley Listed placeWA

Matters of National Environmental Significance

Name Status Type of Presencehabitat likely to occur withinarea

Brush-tailed Rabbit-rat, Brush-tailed Tree-rat,Pakooma [132]

Vulnerable Species or species habitatmay occur within area

Conilurus penicillatus

Northern Quoll, Digul [Gogo-Yimidir], Wijingadda[Dambimangari], Wiminji [Martu] [331]

Endangered Species or species habitatlikely to occur within area

Dasyurus hallucatus

Ghost Bat [174] Vulnerable Species or species habitatmay occur within area

Macroderma gigas

Humpback Whale [38] Vulnerable Species or species habitatmay occur within area

Megaptera novaeangliae

Black-footed Tree-rat (Kimberley and mainlandNorthern Territory), Djintamoonga, Manbul [87618]

Endangered Species or species habitatmay occur within area

Mesembriomys gouldii gouldii

Nabarlek (Kimberley) [87607] Endangered Species or species habitatmay occur within area

Petrogale concinna monastria

Bare-rumped Sheath-tailed Bat, Bare-rumpedSheathtail Bat [66889]

Vulnerable Species or species habitatlikely to occur within area

Saccolaimus saccolaimus nudicluniatus

Reptiles

Loggerhead Turtle [1763] Endangered Breeding likely to occurwithin area

Caretta caretta

Green Turtle [1765] Vulnerable Breeding known to occurwithin area

Chelonia mydas

Leatherback Turtle, Leathery Turtle, Luth [1768] Endangered Breeding likely to occurwithin area

Dermochelys coriacea

Hawksbill Turtle [1766] Vulnerable Breeding likely to occurwithin area

Eretmochelys imbricata

Olive Ridley Turtle, Pacific Ridley Turtle [1767] Endangered Breeding likely to occurwithin area

Lepidochelys olivacea

Flatback Turtle [59257] Vulnerable Breeding known to occurwithin area

Natator depressus

Sharks

White Shark, Great White Shark [64470] Vulnerable Species or species habitatmay occur within area

Carcharodon carcharias

Northern River Shark, New Guinea River Shark[82454]

Endangered Species or species habitatmay occur within area

Glyphis garricki

Dwarf Sawfish, Queensland Sawfish [68447] Vulnerable Species or species habitatknown to occur within area

Pristis clavata

Freshwater Sawfish, Largetooth Sawfish, RiverSawfish, Leichhardt's Sawfish, Northern Sawfish[60756]

Vulnerable Species or species habitatknown to occur within area

Pristis pristis

Green Sawfish, Dindagubba, Narrowsnout Sawfish[68442]

Vulnerable Breeding likely to occurwithin area

Pristis zijsron

Whale Shark [66680] Vulnerable Species or species habitatmay occur within area

Rhincodon typus

Listed Migratory Species [ Resource Information ]* Species is listed under a different scientific name on the EPBC Act - Threatened Species list.Name Threatened Type of PresenceMigratory Marine Birds

Common Noddy [825] Species or species habitatmay occur within area

Anous stolidus

Fork-tailed Swift [678] Species or species habitatlikely to occur within area

Apus pacificus

Streaked Shearwater [1077] Species or species habitatmay occur within area

Calonectris leucomelas

Lesser Frigatebird, Least Frigatebird [1012] Species or species habitatlikely to occur within area

Fregata ariel

Great Frigatebird, Greater Frigatebird [1013] Species or species habitatmay occur within area

Fregata minor

Roseate Tern [817] Foraging, feeding or relatedbehaviour likely to occurwithin area

Sterna dougallii

Little Tern [82849] Species or species habitatmay occur within area

Sternula albifrons

Migratory Marine Species

Narrow Sawfish, Knifetooth Sawfish [68448] Species or species habitatlikely to occur within area

Anoxypristis cuspidata

Bryde's Whale [35] Species or species habitatmay occur within area

Balaenoptera edeni

Blue Whale [36] Endangered Species or species habitatlikely to occur within area

Balaenoptera musculus

White Shark, Great White Shark [64470] Vulnerable Species or species habitatmay occur within area

Carcharodon carcharias


Caretta caretta


Chelonia mydas

Salt-water Crocodile, Estuarine Crocodile [1774] Species or species habitatlikely to occur within area

Crocodylus porosus



Dugong [28] Species or species habitatmay occur within area

Dugong dugon





Name Threatened Type of Presence

Reef Manta Ray, Coastal Manta Ray, Inshore MantaRay, Prince Alfred's Ray, Resident Manta Ray [84994]

Species or species habitatmay occur within area

Manta alfredi

Giant Manta Ray, Chevron Manta Ray, Pacific MantaRay, Pelagic Manta Ray, Oceanic Manta Ray [84995]


Manta birostris




Natator depressus

Australian Snubfin Dolphin [81322] Species or species habitatmay occur within area

Orcaella heinsohni

Killer Whale, Orca [46] Species or species habitatmay occur within area

Orcinus orca

Dwarf Sawfish, Queensland Sawfish [68447] Vulnerable Species or species habitatknown to occur within area

Pristis clavata

Freshwater Sawfish, Largetooth Sawfish, RiverSawfish, Leichhardt's Sawfish, Northern Sawfish[60756]

Vulnerable Species or species habitatknown to occur within area

Pristis pristis

Green Sawfish, Dindagubba, Narrowsnout Sawfish[68442]

Vulnerable Breeding likely to occurwithin area

Pristis zijsron

Whale Shark [66680] Vulnerable Species or species habitatmay occur within area

Rhincodon typus

Indo-Pacific Humpback Dolphin [50] Foraging, feeding or relatedbehaviour known to occurwithin area

Sousa chinensis

Spotted Bottlenose Dolphin (Arafura/Timor Seapopulations) [78900]

Species or species habitatlikely to occur within area

Tursiops aduncus (Arafura/Timor Sea populations)

Migratory Terrestrial Species

Red-rumped Swallow [80610] Species or species habitatmay occur within area

Cecropis daurica

Oriental Cuckoo, Horsfield's Cuckoo [86651] Species or species habitatmay occur within area

Cuculus optatus

Barn Swallow [662] Species or species habitatmay occur within area

Hirundo rustica

Grey Wagtail [642] Species or species habitatmay occur within area

Motacilla cinerea

Yellow Wagtail [644] Species or species habitatmay occur within area

Motacilla flava

Migratory Wetlands Species

Oriental Reed-Warbler [59570] Species or species habitatmay occur within area

Acrocephalus orientalis


Common Sandpiper [59309] Species or species habitatmay occur within area

Actitis hypoleucos

Sharp-tailed Sandpiper [874] Species or species habitatmay occur within area

Calidris acuminata


Calidris canutus


Calidris ferruginea

Pectoral Sandpiper [858] Species or species habitatmay occur within area

Calidris melanotos

Oriental Plover, Oriental Dotterel [882] Species or species habitatmay occur within area

Charadrius veredus

Oriental Pratincole [840] Species or species habitatmay occur within area

Glareola maldivarum

Bar-tailed Godwit [844] Species or species habitatmay occur within area

Limosa lapponica



Osprey [952] Species or species habitatmay occur within area

Pandion haliaetus

Common Greenshank, Greenshank [832] Species or species habitatlikely to occur within area

Tringa nebularia

Listed Marine Species [ Resource Information ]* Species is listed under a different scientific name on the EPBC Act - Threatened Species list.Name Threatened Type of PresenceBirds

Oriental Reed-Warbler [59570] Species or species habitatmay occur within area

Acrocephalus orientalis

Common Sandpiper [59309] Species or species habitatmay occur within area

Actitis hypoleucos

Common Noddy [825] Species or species habitatmay occur within area

Anous stolidus

Magpie Goose [978] Species or species habitatmay occur within area

Anseranas semipalmata



Fork-tailed Swift [678] Species or species habitatlikely to occur within area

Apus pacificus

Great Egret, White Egret [59541] Species or species habitatlikely to occur within area

Ardea alba

Cattle Egret [59542] Species or species habitatmay occur within area

Ardea ibis

Sharp-tailed Sandpiper [874] Species or species habitatmay occur within area

Calidris acuminata


Calidris canutus


Calidris ferruginea

Pectoral Sandpiper [858] Species or species habitatmay occur within area

Calidris melanotos

Streaked Shearwater [1077] Species or species habitatmay occur within area

Calonectris leucomelas

Oriental Plover, Oriental Dotterel [882] Species or species habitatmay occur within area

Charadrius veredus

Black-eared Cuckoo [705] Species or species habitatlikely to occur within area

Chrysococcyx osculans

Lesser Frigatebird, Least Frigatebird [1012] Species or species habitatlikely to occur within area

Fregata ariel

Great Frigatebird, Greater Frigatebird [1013] Species or species habitatmay occur within area

Fregata minor

Oriental Pratincole [840] Species or species habitatmay occur within area

Glareola maldivarum

White-bellied Sea-Eagle [943] Species or species habitatlikely to occur within area

Haliaeetus leucogaster

Red-rumped Swallow [59480] Species or species habitatmay occur within area

Hirundo daurica

Barn Swallow [662] Species or species habitatmay occur within area

Hirundo rustica

Bar-tailed Godwit [844] Species or species habitatmay occur within area

Limosa lapponica

Rainbow Bee-eater [670] Species or species habitatmay occur within area

Merops ornatus


Grey Wagtail [642] Species or species habitatmay occur within area

Motacilla cinerea

Yellow Wagtail [644] Species or species habitatmay occur within area

Motacilla flava



Osprey [952] Species or species habitatmay occur within area

Pandion haliaetus

Painted Snipe [889] Endangered* Species or species habitatlikely to occur within area

Rostratula benghalensis (sensu lato)

Little Tern [813] Species or species habitatmay occur within area

Sterna albifrons

Roseate Tern [817] Foraging, feeding or relatedbehaviour likely to occurwithin area

Sterna dougallii

Common Greenshank, Greenshank [832] Species or species habitatlikely to occur within area

Tringa nebularia

Fish

Three-keel Pipefish [66192] Species or species habitatmay occur within area

Campichthys tricarinatus

Pacific Short-bodied Pipefish, Short-bodied Pipefish[66194]


Choeroichthys brachysoma

Pig-snouted Pipefish [66198] Species or species habitatmay occur within area

Choeroichthys suillus

Fijian Banded Pipefish, Brown-banded Pipefish[66199]


Corythoichthys amplexus

Reticulate Pipefish, Yellow-banded Pipefish, NetworkPipefish [66200]


Corythoichthys flavofasciatus

Roughridge Pipefish [66206] Species or species habitatmay occur within area

Cosmocampus banneri

Bluestripe Pipefish, Indian Blue-stripe Pipefish, PacificBlue-stripe Pipefish [66211]


Doryrhamphus excisus

Cleaner Pipefish, Janss' Pipefish [66212] Species or species habitatmay occur within area

Doryrhamphus janssi

Brock's Pipefish [66219] Species or species habitatmay occur within area

Halicampus brocki

Mud Pipefish, Gray's Pipefish [66221] Species or species habitatmay occur within area

Halicampus grayi


Spiny-snout Pipefish [66225] Species or species habitatmay occur within area

Halicampus spinirostris

Ribboned Pipehorse, Ribboned Seadragon [66226] Species or species habitatmay occur within area

Haliichthys taeniophorus

Beady Pipefish, Steep-nosed Pipefish [66231] Species or species habitatmay occur within area

Hippichthys penicillus

Spiny Seahorse, Thorny Seahorse [66236] Species or species habitatmay occur within area

Hippocampus histrix

Spotted Seahorse, Yellow Seahorse [66237] Species or species habitatmay occur within area

Hippocampus kuda

Flat-face Seahorse [66238] Species or species habitatmay occur within area

Hippocampus planifrons

Hedgehog Seahorse [66239] Species or species habitatmay occur within area

Hippocampus spinosissimus

Tidepool Pipefish [66255] Species or species habitatmay occur within area

Micrognathus micronotopterus

Pallid Pipehorse, Hardwick's Pipehorse [66272] Species or species habitatmay occur within area

Solegnathus hardwickii

Gunther's Pipehorse, Indonesian Pipefish [66273] Species or species habitatmay occur within area

Solegnathus lettiensis

Robust Ghostpipefish, Blue-finned Ghost Pipefish,[66183]


Solenostomus cyanopterus

Double-end Pipehorse, Double-ended Pipehorse,Alligator Pipefish [66279]


Syngnathoides biaculeatus

Bentstick Pipefish, Bend Stick Pipefish, Short-tailedPipefish [66280]


Trachyrhamphus bicoarctatus

Straightstick Pipefish, Long-nosed Pipefish, StraightStick Pipefish [66281]


Trachyrhamphus longirostris

Mammals

Dugong [28] Species or species habitatmay occur within area

Dugong dugon

Reptiles

Horned Seasnake [1114] Species or species habitatmay occur within area

Acalyptophis peronii

Dubois' Seasnake [1116] Species or species habitatmay occur within area

Aipysurus duboisii

Spine-tailed Seasnake [1117] Species or species habitatmay occur within

Aipysurus eydouxii

Name Threatened Type of Presencearea

Olive Seasnake [1120] Species or species habitatmay occur within area

Aipysurus laevis

Stokes' Seasnake [1122] Species or species habitatmay occur within area

Astrotia stokesii


Caretta caretta


Chelonia mydas

Freshwater Crocodile, Johnston's Crocodile,Johnston's River Crocodile [1773]


Crocodylus johnstoni

Salt-water Crocodile, Estuarine Crocodile [1774] Species or species habitatlikely to occur within area

Crocodylus porosus



Spectacled Seasnake [1123] Species or species habitatmay occur within area

Disteira kingii

Olive-headed Seasnake [1124] Species or species habitatmay occur within area

Disteira major

Turtle-headed Seasnake [1125] Species or species habitatmay occur within area

Emydocephalus annulatus

Beaked Seasnake [1126] Species or species habitatmay occur within area

Enhydrina schistosa



Black-ringed Seasnake [1100] Species or species habitatmay occur within area

Hydrelaps darwiniensis

Elegant Seasnake [1104] Species or species habitatmay occur within area

Hydrophis elegans

null [25926] Species or species habitatmay occur within area

Hydrophis mcdowelli

Spotted Seasnake, Ornate Reef Seasnake [1111] Species or species habitatmay occur within area

Hydrophis ornatus

Spine-bellied Seasnake [1113] Species or species habitatmay occur within area

Lapemis hardwickii




Natator depressus

Yellow-bellied Seasnake [1091] Species or speciesPelamis platurus

Name Threatened Type of Presencehabitat may occur withinarea

Whales and other Cetaceans [ Resource Information ]Name Status Type of PresenceMammals

Bryde's Whale [35] Species or species habitatmay occur within area

Balaenoptera edeni

Blue Whale [36] Endangered Species or species habitatlikely to occur within area

Balaenoptera musculus

Common Dophin, Short-beaked Common Dolphin [60] Species or species habitatmay occur within area

Delphinus delphis

Risso's Dolphin, Grampus [64] Species or species habitatmay occur within area

Grampus griseus



Irrawaddy Dolphin [45] Species or species habitatmay occur within area

Orcaella brevirostris

Killer Whale, Orca [46] Species or species habitatmay occur within area

Orcinus orca

Indo-Pacific Humpback Dolphin [50] Foraging, feeding or relatedbehaviour known to occurwithin area

Sousa chinensis

Spotted Dolphin, Pantropical Spotted Dolphin [51] Species or species habitatmay occur within area

Stenella attenuata

Indian Ocean Bottlenose Dolphin, Spotted BottlenoseDolphin [68418]


Tursiops aduncus

Spotted Bottlenose Dolphin (Arafura/Timor Seapopulations) [78900]


Tursiops aduncus (Arafura/Timor Sea populations)

Bottlenose Dolphin [68417] Species or species habitatmay occur within area

Tursiops truncatus s. str.

State and Territory Reserves [ Resource Information ]Name StateUunguu WA

Extra Information

Invasive Species [ Resource Information ]Weeds reported here are the 20 species of national significance (WoNS), along with other introduced plantsthat are considered by the States and Territories to pose a particularly significant threat to biodiversity. Thefollowing feral animals are reported: Goat, Red Fox, Cat, Rabbit, Pig, Water Buffalo and Cane Toad. Maps fromLandscape Health Project, National Land and Water Resouces Audit, 2001.

Name Status Type of PresenceFrogs

Name Status Type of Presence

Cane Toad [83218] Species or species habitatlikely to occur within area

Rhinella marina

Mammals

Domestic Dog [82654] Species or species habitatlikely to occur within area

Canis lupus familiaris

Donkey, Ass [4] Species or species habitatlikely to occur within area

Equus asinus

Cat, House Cat, Domestic Cat [19] Species or species habitatlikely to occur within area

Felis catus

Plants

Buffel-grass, Black Buffel-grass [20213] Species or species habitatmay occur within area

Cenchrus ciliaris

Reptiles

Asian House Gecko [1708] Species or species habitatlikely to occur within area

Hemidactylus frenatus

Flowerpot Blind Snake, Brahminy Blind Snake, CacingBesi [1258]


Ramphotyphlops braminus

- non-threatened seabirds which have only been mapped for recorded breeding sites

- migratory species that are very widespread, vagrant, or only occur in small numbers

- some species and ecological communities that have only recently been listed

Not all species listed under the EPBC Act have been mapped (see below) and therefore a report is a general guide only. Where available datasupports mapping, the type of presence that can be determined from the data is indicated in general terms. People using this information in makinga referral may need to consider the qualifications below and may need to seek and consider other information sources.

For threatened ecological communities where the distribution is well known, maps are derived from recovery plans, State vegetation maps, remotesensing imagery and other sources. Where threatened ecological community distributions are less well known, existing vegetation maps and pointlocation data are used to produce indicative distribution maps.

- seals which have only been mapped for breeding sites near the Australian continentSuch breeding sites may be important for the protection of the Commonwealth Marine environment.

Threatened, migratory and marine species distributions have been derived through a variety of methods. Where distributions are well known and iftime permits, maps are derived using either thematic spatial data (i.e. vegetation, soils, geology, elevation, aspect, terrain, etc) together with pointlocations and described habitat; or environmental modelling (MAXENT or BIOCLIM habitat modelling) using point locations and environmental datalayers.

The information presented in this report has been provided by a range of data sources as acknowledged at the end of the report.Caveat

- migratory and

The following species and ecological communities have not been mapped and do not appear in reports produced from this database:- marine

This report is designed to assist in identifying the locations of places which may be relevant in determining obligations under the EnvironmentProtection and Biodiversity Conservation Act 1999. It holds mapped locations of World and National Heritage properties, Wetlands of Internationaland National Importance, Commonwealth and State/Territory reserves, listed threatened, migratory and marine species and listed threatenedecological communities. Mapping of Commonwealth land is not complete at this stage. Maps have been collated from a range of sources at variousresolutions.

- threatened species listed as extinct or considered as vagrants

- some terrestrial species that overfly the Commonwealth marine area

The following groups have been mapped, but may not cover the complete distribution of the species:

Only selected species covered by the following provisions of the EPBC Act have been mapped:

Where very little information is available for species or large number of maps are required in a short time-frame, maps are derived either from 0.04or 0.02 decimal degree cells; by an automated process using polygon capture techniques (static two kilometre grid cells, alpha-hull and convex hull);or captured manually or by using topographic features (national park boundaries, islands, etc). In the early stages of the distribution mappingprocess (1999-early 2000s) distributions were defined by degree blocks, 100K or 250K map sheets to rapidly create distribution maps. More reliabledistribution mapping methods are used to update these distributions as time permits.

-14.0761 126.4553

Coordinates

-Environment and Planning Directorate, ACT-Birdlife Australia-Australian Bird and Bat Banding Scheme

-Department of Parks and Wildlife, Western Australia

Acknowledgements

-Office of Environment and Heritage, New South Wales

-Department of Primary Industries, Parks, Water and Environment, Tasmania

-Department of Land and Resource Management, Northern Territory-Department of Environmental and Heritage Protection, Queensland

-Department of Environment and Primary Industries, Victoria

-Australian National Wildlife Collection

-Department of Environment, Water and Natural Resources, South Australia

This database has been compiled from a range of data sources. The department acknowledges the followingcustodians who have contributed valuable data and advice:

-Australian Museum

-National Herbarium of NSW

Forestry Corporation, NSW-Australian Government, Department of Defence

-State Herbarium of South Australia

The Department is extremely grateful to the many organisations and individuals who provided expert adviceand information on numerous draft distributions.

-Natural history museums of Australia

-Queensland Museum

-Australian National Herbarium, Canberra

-Royal Botanic Gardens and National Herbarium of Victoria

-Geoscience Australia

-Ocean Biogeographic Information System

-Online Zoological Collections of Australian Museums-Queensland Herbarium

-Western Australian Herbarium

-Tasmanian Herbarium

-Northern Territory Herbarium

-South Australian Museum

-Museum Victoria

-University of New England

-CSIRO

-Other groups and individuals-Tasmanian Museum and Art Gallery, Hobart, Tasmania

-Museum and Art Gallery of the Northern Territory

-Reef Life Survey Australia-Australian Institute of Marine Science-Australian Government National Environmental Science Program

-Australian Tropical Herbarium, Cairns

-Australian Government – Australian Antarctic Data Centre

-Queen Victoria Museum and Art Gallery, Inveresk, Tasmania

-eBird Australia

-American Museum of Natural History

© Commonwealth of Australia

+61 2 6274 1111Canberra ACT 2601 Australia

GPO Box 787Department of the Environment

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