Cape Riche Seawater Desalination Plant - Grange Resources

Grange ResourcesReport for Southdown MagnetiteProject - Cape Riche SeawaterDesalination PlantNoise and VibrationAssessmentApril 2011

Contents1. Introduction 11.1 Background 11.2 Scope of Work 11.3 Approach 22. Project Proposal 32.1 Overview 32.2 Open Channel Intake and Discharge 32.3 Intake Pump Station 52.4 Desalination Plant 52.5 Supply, Intake and Discharge Pipelines 63. Noise Sources 93.1 Construction 93.2 Operational 93.3 Road Traffic 104. Noise Criteria 114.1 Construction Noise 114.2 Operational Noise 124.3 Rail and Road Traffic Noise 145. Existing Noise Environment 155.1 Monitoring Locations 155.2 Meteorological Conditions 185.3 Attended Noise Monitoring Results 185.4 Noise Logging Results 195.5 Existing Noise Environment 245.6 Receptor Locations 256. Construction Noise and Vibration Assessment 266.1 Construction Noise 266.2 Construction Vibration 287. Operational Noise Assessment 307.1 Noise Modelling Software Package 3061/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessmentii

7.2 Noise Model Configuration 307.3 Noise Modelling Results 387.4 Road Traffic Noise Assessment 468. Recommended Mitigation Measures 478.1 Construction Noise 478.2 Operational Noise 488.3 Noise Complaints 489. Conclusions 4910. Limitations 50References 51Table IndexTable 1 Assigned noise levels 12Table 2Adjustment for intrusive or dominant noisecharacteristics 13Table 3 Outdoor noise criteria, dB(A) 14Table 4Sound level meter and environmental noise loggerdetails 17Table 5 Meteorological data for Jacup AWS 18Table 6 Attended noise monitoring results, dB(A) 19Table 7 Noise logging results, dB(A) 20Table 8Summary of attended and unattended noisemonitoring, dB(A) 24Table 9 Receptor locations 25Table 10 Predicted plant activity noise levels, dB(A) 27Table 11 Typical vibration levels for construction equipment 29Table 12 Meteorological conditions for noise modelling 31Table 13 Inventory of operational noise sources 32Table 14 Estimated sound power levels, dB(A) 35Table 15 Estimated internal sound pressure levels, dB(A) 37Table 16 Transmission loss of building materials, dB 38Table 17Normal operations predicted night time L A 10 noiselevels, dB(A) 38Table 18 Non routine operations predicted night time L A 10noise levels, dB(A) 4061/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessmentiii

Figure IndexFigure 1 Indicative site layout 4Figure 2 Desalination plant process flow diagram 8Figure 3 Cape Riche campsite monitoring location 16Figure 4Campsite location looking towards the intake pumpstation location 16Figure 5 Moir residence monitoring location 16Figure 6Moir residence monitoring location looking towardsthe intake pump station location 16Figure 7 Lock residence monitoring location 17Figure 8Lock residence monitoring location looking towardsthe desalination plant location 17Figure 9 Turner residence monitoring location 17Figure 10Turner residence monitoring location lookingtowards the desalination plant location 17Figure 11 Isometric view – Desalination plant 37Figure 12Figure 13Figure 14Figure 15Figure 16Predicted night time L A 10 noise levels under neutralmeteorological conditions 41Predicted night time L A 10 noise levels under worstcase meteorological conditions – Winds blowingtowards Cape Riche campsite 42Predicted night time L A 10 noise levels under worstcase meteorological conditions – Winds blowingtowards Moir residence 43Predicted night time L A 10 noise levels under worstcase meteorological conditions – Winds blowingtowards Lock residence 44Predicted night time L A 10 noise levels under worstcase meteorological conditions – Winds blowingtowards Turner residence 45AppendicesA Noise Logging ResultsB Layout DrawingsC Glossary of Noise TerminologyD Noise Charts61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessmentiv

Glossary of Acronyms and TermsAHDASCadnaACEOCIPDECEPAGHDGLGL/aGrangeAustralian height datumAustralian StandardComputer Aided Noise Abatement software used for calculating predicted noiseemissions.Chief Executive OfficerClean in placeDepartment of Environment and ConservationEnvironmental Protection AuthorityGHD Pty Ltdgigalitregigalitre per annumGrange Resources Limitedha hectare, 10,000 m 2IFMLPERPFSROUFinfluencing factormegalitrePublic Environmental ReviewPre Feasibility Studyreverse osmosisultra filtration61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessmentv

Executive SummaryGrange Resources Limited (Grange), as part of the Southdown Magnetite Project, propose to developthe Cape Riche Seawater Desalination Plant consisting of an intake pump station, reverse osmosis (RO)desalination facility and adjoining pipelines between the Plant and the Southdown mine. The Plant isdesigned to provide up to 12 gigalitres per annum (GL/a) of treated water for use at the Southdown mine.GHD Pty Ltd (GHD) was commissioned by Grange to assess the potential noise and vibration impactsfor the construction and operation of the Plant.Noise SourcesConstruction activities expected to be undertaken at the sites include site clearance earthworks,concreting, welding, cutting, grinding and mechanical lifting including cranes, trucks and mobileplatforms. The majority of activities will occur on-site between 08:00 and 17:00 Monday to Saturday.Major operational noise sources present during the operation of the Plant include:Seawater intake pump and screening station;Desalination plant – ultra filtration (UF) pre treatment;Desalination plant – RO membranes;Transfer (permeate) pump station; andWastewater sludge collection and dewatering.Existing Noise EnvironmentThe Moir residence and Cape Riche campsite are the two nearest sensitive receptors to potential noisesources from the intake pump station, located approximately 560 m and 1,110 m away, respectively. Thenearest residential receptor to the desalination plant, Turner residence is located approximately 1,900 msouth of the plant. Another residential receptor, Lock residence is located approximately 2,500 m southwest of the desalination plant site.Noise monitoring undertaken at Cape Riche campsite and the Moir, Turner and Lock residences indicatethe noise environment is typically described by low background noise levels with intermittent noisecontributions from local sources (occasional traffic and natural sources).Assessment of Potential ImpactsNoise impacts associated with construction of the intake pump station are likely to be audible and maycause nuisance at Moir residence and to a lesser extent at the Cape Riche campsite. Inline with theRegulations, activities that cause excessive noise will be limited to week days or Saturdays between07:00 and 19:00. Noise impacts associated with construction of the desalination plant are unlikely to beaudible or to cause nuisance.Assessment of vibration due to construction of the intake pump station or desalination plant concludedthat vibrations affecting human comfort or building integrity were not expected to be an issue.Acoustic modelling was undertaken to predict the effects of operational noise generated by the intakepump station and desalination plant. Modelling under neutral and worst case meteorological conditions61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessmentvi

predicts compliance with the assigned night time L A 10 noise level of 35 dB(A) at all sensitive receptorsand compliance with the assigned level of 65 dB(A) at the Plant boundaries.ConclusionAssessment of the Cape Riche Seawater Desalination Plant indicates:Construction activities associated with the intake pump station may be audible at Moir residence andthe Cape Riche campsite and as such should only be undertaken during week days or Saturdaysbetween 07:00 and 19:00;Predicted noise levels generated by the Plant during normal operations under neutral and worst casemeteorological conditions are well below the night time assigned L A 10 noise level of 35 dB(A) at CapeRiche campsite and Moir, Lock and Turner residences; andPredicted noise levels generated by the Plant during non routine operations under neutral and worstcase meteorological conditions are below the night time assigned L A 10 noise level of 35 dB(A) at thefour assessed sensitive receptors.Based on the information provided and assessment of predicted noise levels, it is expected that the Plantcan meet relevant noise goals and no further mitigation measures are recommended for operation of thePlant.This report provides a noise assessment for the Cape Riche Seawater Desalination Plant and should beread based on the limitations presented in Section 10..61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessmentvii

1. IntroductionGrange Resources Limited (Grange) intend to develop a seawater desalination plant to supply up to 12gigalitres per annum (GL/a) of water to the Southdown mine, as part of the Southdown MagnetiteProject. The Cape Riche Seawater Desalination Plant comprises an intake pump station, reverseosmosis (RO) desalination facility and intake and discharge pipelines extending from the outfall site atCheyne Bay Inlet to the Plant and from the Plant to the Southdown mine site.1.1 BackgroundThe Cape Riche Seawater Desalination Plant was proposed by Grange to supplement in-situ watersupplies at the Southdown mine for the purpose of transporting ore to processing and port facilities inAlbany via the planned slurry pipeline. The Plant is proposed to be constructed on freehold land 4.5 kmeast of Cape Riche, which is currently used for livestock and cropping agriculture.The desalination facility will be supplied by an intake pump station located adjacent to the coast at CapeRiche. The intake pump station is planned to be submerged underground to insulate against noise andvisual impacts, however, will still require a transformer and electrical building with appropriate accessroads. The desalination plant will take water from the open channel intake located near Cheyne InletBeach and will discharge water from the Southern Ocean Brine Discharge, located on the southern sideof Cape Riche.The Southdown Magnetite Project involves the construction and operation of an open pit magnetite minelocated approximately 90 km east north east of Albany, near Wellstead.1.2 Scope of WorkGHD Pty Ltd (GHD) was commissioned by Grange to prepare a Public Environmental Review (PER) inorder to complete environmental approvals for the Cape Riche Seawater Desalination Plant. As part ofthis commission, GHD was required to assess the potential acoustic impacts from the construction andoperation of the Plant.The scope of work is as follows:Identify noise sensitive locations surrounding the Plant;Describe the existing noise environment at noise sensitive locations surrounding the Plant. Noisesensitive receptors include the Cape Riche campsite and Moir, Lock and Turner residences;Identify noise and vibration sources associated with operation and construction of the Plant;Develop an environmental noise model showing the impacts from the operation of the Plant;Use the noise model to assess worst case operational noise based on the case of all plant operatingon-site continuously at full load;Assess the potential noise impacts on nearby noise sensitive receptors and compare the impactswith assigned noise levels; andIdentify opportunities for the attenuation of noise impacts from the Plant on noise sensitive areasshould predicted noise impacts exceed the relevant noise targets.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment1

1.3 ApproachThe approach adopted by GHD for the assessment of noise impacts from the Cape Riche SeawaterDesalination Plant is summarised in the following points. Each point is described in detail in thesubsequent sections of the report. Outline of the Plant, including desalination process description (Section 2); Anticipated construction, operational and road traffic noise sources (Section 3); Identification of relevant noise criteria applicable to this assessment (Section 4);Investigation of the existing noise environment, including identification of sensitive receptors, noiselogging and assessment of noise monitoring to determine background and various time related noiselevels (Section 5); Desktop assessment of construction noise and vibration (Section 6);Noise modelling for the assessment of predicted noise impacts during operation of the Plant. Roadtraffic noise was addressed by desktop review (Section 7); Recommend noise mitigation measures for construction and operational noise sources (Section 8);andConclusions drawn from the above assessment (Section 9), subject to the Scope (Section 1.2) andLimitations (Section 10).61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment2

2. Project ProposalThe design of the Cape Riche Seawater Desalination Plant is provided in the Southdown Magnetite andKemaman Pellet Plant Project Pre Feasibility Study (PFS) (Grange Resources/Sojitz 2010). This designhas been used as a basis for this assessment. The sections below provide a summary of the informationprovided in the PFS.2.1 OverviewThe desalinated water supply system will consist of a seawater RO desalination plant at Cape Riche withpumped transfer of desalinated water to the mine site. The desalinated water will be used primarily asprocess water at the mine site, with a small portion further treated at the mine site to provide potablewater.The Plant has a design capacity of approximately 35 million litres per day (ML/d), based on theproduction of 12 GL/a. Figure 1 provides an indicative site layout. The key components of the Plant are:1. Open Channel Intake and Discharge: The desalination plant will take water from the open channelintake located near Cheyne Inlet Beach and will discharge water from the Southern Ocean BrineDischarge, located on the southern side of Cape Riche.2. Intake Pump Station: In order to transport the saline water to the desalination plant site pumps willoperate at the coast.3. Desalination Plant: The treatment of saline water will involve large scale RO to produce a treatedwater supply and brine discharge.4. Supply, Intake and Discharge Pipelines: Three major pipelines will be required for the desalinationplant, including supply, intake and discharge lines.Figure 2 provides a schematic of the desalination plant system.2.2 Open Channel Intake and DischargeThe open channel intake located near Cheyne Inlet Beach will connect to the onshore intake pumpstation via a concrete lined channel. Seawater concentrate (brine) will be discharged from the SouthernOcean Brine Discharge, located on the southern side of Cape Riche.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment3

638,000645,000652,000659,000!(WAGIN DUMBLEYUNG!( !(Locality MapKATANNING!(RAVENSTHORPE!(GNOWELLEN RDWellstead(approx 2.5km)SANDALWOOD RD!(GNOWANGERUP JERRAMUNGUPTAMBELLUP!( !(!(CRANBROOK!(WELLSTEAD!(MOUNT BARKER!(BREMER BAY!(!(DENMARK!(ALBANYLITTLE GROVE!( !(SouthernOceanSOUTH COAST HWY24.5km DN600 Underground PipelineTreated Water Transfer6,175,000ApprovedPit Boundary6,175,000SHEARER RDCAPE RICHE RDMETTLER RDMETTLER LAKENATURERESERVENB: Actual road does not folllowRoad Reserve as marked.Pipeline to follow actual roaddisturbance corridor.PublicCamp GroundsHASSELL NATIONAL PARKNB: Pipeline is generallylocated within clearedfarm land.4.5km DN630 Underground PipelineSeawater Concentrate DisposalPROPOSEDCONSERVATIONPARKCHEYNE ISLANDNATURE RESERVEIndicativePump StationLease BoundaryR149426,168,0006,168,000VENNS RDBASIL RDProposedCape RicheDesalination Plant4.5km DN800 PE PipeSeawater SupplyBASIL ROADNATURERESERVETURNOR RD638,000645,000652,000659,0001:70,000 (at A3)LEGENDGrange Resourceso0 0.75 1.5 2.25 3Seawater Supply PipelineDesalination PlantPit BoundarySouthdown EnvironmentKilometresTreated Water TransferPump StationCadastral BoundaryCape RicheOutfall PipelineNational ParksSeawater Desalination Plantor ReservesGrid: Map Grid of Australia 1994, Zone 50 Indicative Site LayoutFigure 1Map Projection: Transverse MercatorHorizontal Datum: Geocentric Datum of AustraliaJob Number 61-26005Revision 0Date 02 MAY 2011G:\61\26005\GIS\Maps\MXD\612600502_G001_Fig1a_Rev0.mxd239 Adelaide Terrace Perth WA 6004 Australia T 61 8 6222 8222 F 61 8 6222 8555 E permail@ghd.com.au W www.ghd.com.au© 2011. While GHD has taken care to ensure the accuracy of this product, GHD, Harley Global, Landgate, DEC and Grange Resources make no representations or warranties about its accuracy, completeness or suitability for any particular purpose.GHD, Harley Global, Landgate, DEC and Grange Resources cannot accept liability of any kind (whether in contract, tort or otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred as a result of the product being inaccurate, incomplete or unsuitable in any way and for any reason.Data source: Landgate: Cadastre, Reserve or National Park - 20101018, Road Names - 20110411; Grange Resources: Mosaic - 200901, Pit Boundary - 20100812; Harley Global: Seawater Pipeline, Desalination Plant, Pump Station, Outfall Pipeline, Treated Water Transfer - 20110502. Created by: tgoad

2.4.2 Reverse OsmosisThe RO plant will be a single pass design. The feed water will be divided and feed the low pressure feedpump station and the high pressure feed pump. The high pressure feed will pass through ROmembranes, producing permeate.RO Train Design: The RO system will consist of six RO trains, each with one RO rack of sevenmembrane elements. A total of 24 pumps will be required for the RO and energy recovery system, alllocated within the RO building.Clean In Place System: Periodic chemical cleaning will be required for the system. The clean in place(CIP) system includes recirculation pumps, filters and a CIP tank and neutralisation tank. Solutionswill be made up in the CIP tank and the pump will circulate the solution through the filter and to theRO membrane. Permeate Storage: Permeate will be collected in a storage tank with a working capacity of 0.5 ML (15minutes storage at maximum design flow). The tank will supply water to the permeate pump stationfor post treatment and also to the backwash pump station for use in the plant.2.4.3 Wastewater TreatmentTreatment of wastewater generated by strainer flushing and UF backwash and CIP wastes consists of:Collection and Storage: Pre-treatment wastewater will be collected in the backwash holding tank.The tank is covered and will have two cells operating in parallel. Each cell will have fixed speedsubmersible mixer which will operate continuously. A dedicated pump station will feed wastewater tothe thickeners. This pump station will be a rectangular concrete sump with two (duty/standby)submersible pump sets.Wastewater Thickening: Two conventional thickeners will operate in parallel. Each will have amotorised fixed speed, continually operating scraper to rake settled sludge to a central sump. Sludgewill be periodically pumped from thickener collection sumps with two (duty/standby) fixed speedpumps to one thickened sludge storage tank. The sludge thickeners will not be enclosed in abuilding.Sludge Dewatering: Sludge will be dewatered via a batch operated decanting centrifuge plant,operating during day time hours. The plant will house two centrifuges operating in parallel. Thecentrifuge plant will be enclosed in a building. Dewatered sludge will be placed in skip bins forcollection and off site disposal.Disposal of Liquids: Supernatant from sludge thickeners and filtrate from the dewatering plant will bestored in one supernatant tank. The supernatant tank water will be pumped to the concentratestorage tank, using two (duty/standby) pumps, for ocean disposal.2.5 Supply, Intake and Discharge PipelinesThe 4.5 km long intake and outfall pipeline route between the seawater pump station and thedesalination plant follows an existing track and gravel road.The pipeline route from the desalination plant to the mine site runs along Cape Road to the west then tothe northwest to the junction with Mettler Road, follows Mettler Road to the south west to Kojaneerup61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment6

Road and follows the easement to the mine site. The route crosses the South Coast Highway at theSouth Coast Highway / Kojaneerup Road intersection adjacent to the mine site.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment7

Figure 2Desalination plant process flow diagram61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment8

3. Noise Sources3.1 ConstructionNoise and vibration generated as a result of construction activities are outlined below. Constructionworks are due to commence as soon as all relevant approvals and permits are obtained and is expectedto occur over an 18 month period.Construction activities expected to be undertaken include civil excavation and earthworks, buildingconstruction, equipment fabrication and installation, waste removal and materials transfer. Constructionactivities will occur between 08:00 to 17:00 Monday to Saturday. Work at other times would only occur ifrequired for special tasks or to recover lost time due to project delays. Where possible, activities thatcould result in elevated noise levels will be scheduled during day time work hours.An assessment of construction noise and vibration has been made in Section 6.3.2 OperationalNoise sources resulting from operation of the Cape Riche Seawater Desalination Plant are outlinedbelow. Major operational noise sources present during operation include:Seawater intake pump station:– Seawater intake pumps; and– Travelling band screen drives.Desalination plant – UF pre treatment:– UF feed pumps;– Backwash screw compressors; and– Backwash rotary air blowers.Desalination plant - RO membranes (six trains):– RO feed booster pumps;– RO high pressure feed pumps;– Energy recovery devices (ERD);– ERD feed booster pumps;– RO flushing pumps;– RO clean in place (CIP) pumps; and– Permeate (desalinated water) pumps.Wastewater sludge collection and dewatering:– Thickener feed pumps;– Thickener drives;– Dewatering feed pumps;– Decanted centrifuge (sludge dewatering);– Screw conveyors; and61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment9

– Supernatant return pumps.An assessment of operational noise has been made in Section 7.3.3 Road TrafficThe project has the potential to increase traffic along the local road network, including the South CoastHighway, Shearer Road, Mettler Road and Cape Riche Road. These primarily carry local farm trafficincluding occasional heavy farm machinery.There would be an increase in traffic movements associated with the Plant during construction andoperation. During construction, this would include transport of materials to the site, removal of waste fromthe site and transport of construction personnel to and from the site. During operation, increases in trafficwould be associated with heavy vehicles for delivery of products and removal of wastes as well ascommuter traffic.An assessment of road traffic noise has been made in Section 7.4.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment10

4. Noise CriteriaEnvironmental noise in WA is managed through the Environmental Protection (Noise) Regulations 1997(the Regulations). The Regulations specify maximum allowable external noise levels at noise sensitive,commercial and industrial premises. The Regulations also state requirements for construction sites.4.1 Construction NoiseThe Regulations state that for construction work carried out between 07:00 and 19:00 on any day, whichis not a Sunday or public holiday:Then construction work must be carried out in accordance with control of environmental noisepractices set out in Section 6 of Australian Standard (AS) 2436-2010 Guide to Noise and VibrationControl on Construction, Demolition and Maintenance Sites;The equipment used for construction must be the quietest reasonably available; andThe Chief Executive Officer (CEO) (of the Department of Environment and Conservation (DEC)) mayrequest that a noise management plan be submitted for the construction work at any time andcomplied with during construction activities.For construction work done outside these hours:The construction work must be carried out in accordance with control of environmental noisepractices set out in Section 6 of AS 2436-2010;The equipment used for construction must be the quietest reasonably available;The contractor must advise all nearby sensitive receptors likely to receive noise levels which fail tocomply with the assigned levels under Regulation 8 (Table 1) of the work to be done at least 24hours before it commences;The contractor must show that it was reasonably necessary for the work to be done out of hours; andThe contractor must submit to the DEC CEO a noise management plan at least seven days prior tothe commencement of work and the plan must be approved by the CEO. The plan must includedetails of:– Reasons for the construction work needing to be completed out of hours;– Details of activities which are likely to result in noise emissions that lead to exceedance ofassigned levels;– Predictions of the noise emissions on the site;– Details of measures used to control noise (including vibration) emissions;– Procedures to be adopted for monitoring noise (including vibration) emissions; and– Complaint response procedures to be adopted.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment11

4.2 Operational NoiseThe Regulations (Regulation 7) define prescribed standards for noise emissions as follows:7. (1) Noise emitted from any premises or public place when received at other premises –(a)Must not cause or significantly contribute to, a level of noise which exceeds the assignedlevel in respect of noise received at premises of that kind; and(b) Must be free of –(i)(ii)(iii)Tonality;Impulsiveness; andModulation.”Further, a…noise emission is taken to significantly contribute to a level of noise if the noise emissionexceeds a value which is 5 dB below the assigned level…The assigned levels (Regulation 8) are shown in Table 1.Table 1Assigned noise levelsType of premisereceiving noiseTime of dayAssigned level, dB(A)LA 10 LA 1 LA MaxNoise sensitive [1] 22:00 on any day to 07:0007:00 to 19:00 Monday toSaturday (Day)09:00 to 19:00 Sunday andpublic holidays (Sunday)19:00 to 22:00 all days(Evenings)Monday to Saturday and09:00 Sunday and publicholidays (Night)45 + IF 55 + IF 65 + IF40 + IF 50 + IF 65 + IF40 + IF 50 + IF 55 + IF35 + IF 45 + IF 55 + IFNoise sensitive [2] All hours 60 75 80Commercial All hours 60 75 80Industrial and utility All hours 65 80 90IF = influencing factor1Located within 15m of a building directly associated with a noise sensitive use.2Located further than 15 m from a building directly associated with a noise sensitive use61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment12

Tonality, impulsiveness and modulation are defined in Regulation 9. Noise is to be taken to be free ofthese characteristics if:(a)(b)The characteristics cannot be reasonably and practicably removed by techniques otherthan attenuating the overall level of noise emission; andThe noise emission complies with the standard after the adjustments of Table 2 are madeto the noise emission as measured at the point of reception.Table 2 Adjustment for intrusive or dominant noise characteristics [3]Tonality [4] Impulsiveness [4] Modulation [4]+5 dB +5 dB +5 dBAssigned noise levels (Table 1) have been set differently for noise sensitive, commercial and industrialand utility premises. For noise sensitive premises an influencing factor (IF) is incorporated into theassigned noise levels. IF depends on land use zonings within circles of 100 m and 450 m radius from thenoise receiver, including:Proportion of industrial land use zonings;Proportion of commercial zonings; andPresence of major or secondary roads.For this assessment it has been assumed that IF will be zero for all noise sensitive premises surroundingthe Plant, as they are more than 450 m from any industrial or commercial premises or major road.For noise sensitive residences, the time of day also affects the assigned levels. The Regulations definethree types of assigned noise level:L A 10 assigned noise level which is not to be exceeded for more than 10% of the time;L A 1 assigned noise level which is not to be exceeded for more than 1% of the time; andL A Max assigned noise level means a noise level which is not to be exceeded at any time.The L A 10 noise limit is the most significant for this assessment as this is representative of continuousnoise emissions from the Plant.4.2.1 Cape Riche CampsiteCape Riche campsite is classified as a noise sensitive premise under the Regulations. The assignednoise levels at noise sensitive premises will vary depending on time of day. The most stringent noisecriterion is the night time (22:00 to 07:00) L A 10 assigned noise level of 35 dB(A). Predicted noise levelsfrom the Plant have been assessed against this limit for the Cape Riche campsite.3Adjustment applies where noise emission is not music4Adjustments are cumulative to a maximum of 15 dB61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment13

4.2.2 Moir, Lock and Turner ResidencesThere are three identified permanent residences which may be subject to noise impacts from thedesalination plant or intake pump station, the Moir, Lock and Turner residences. Predicted noise levelshave been assessed against the night time L A 10 assigned noise level of 35 dB(A) at these threeresidences.4.3 Rail and Road Traffic NoiseTransportation noise sources are excluded from the Regulations. State Planning Policy 5.4: Road andRail Transport Noise and Freight Considerations in Land Use Planning (SPP 5.4) (WAPC 2009) outlinesthe most relevant criteria for transportation noise.SPP 5.4 has been adopted by the Western Australian Planning Commission (WAPC) as a whole ofGovernment approach to managing noise from transportation sources.This policy does not apply:Retrospectively to noise from existing railways or major roads in the vicinity of an existing noisesensitive land use; andTo proposals involving an increase in traffic along an existing railway or major road in the absence ofa major redevelopment.Table 3 outlines outdoor noise criteria applying to proposals for new noise-sensitive developments ornew major roads and railways assessed under the SPP 5.4.Table 3Outdoor noise criteria, dB(A)Time of day Noise target Noise limitDay (06:00 to 22:00) L A Eq (Day) = 55 L A Eq (Day) = 60Night (22:00 to 06:00) L A Eq (Night) = 50 L A Eq (Night) = 5561/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment14

5. Existing Noise Environment5.1 Monitoring LocationsNoise monitoring locations for this assessment were determined by reviewing aerial photos and frominformation provided by Grange. The identified locations comprised of noise sensitive receptors in thevicinity of the desalination plant (Lock and Turner residences) and the intake pump station (Cape Richecampsite and Moir residence).Noise logging was conducted between 9 and 23 February 2011, using ARL EL-315 environmental noiseloggers at the four locations.5.1.1 Cape Riche CampsiteThe Cape Riche campsite is located off Cheyne Bay Beach. The campsite has caretakers living at thesite. The beach is a local recreation area. Noise logging was undertaken near the caretaker’s residence.Figure 3 shows the Cape Riche campsite monitoring location whilst Figure 4 shows the view lookingsouth towards the proposed intake pump station location.5.1.2 Moir ResidenceThe Moir residence is located south west of the proposed intake pump station. Noise logging wasundertaken near the residence on the property. Figure 5 shows the Moir residence monitoring locationwhilst Figure 6 shows the view looking north east towards the proposed intake pump station location.5.1.3 Lock ResidenceThe Lock residence is located south west of the proposed desalination plant location. Noise logging wasundertaken near the residence on the property. Figure 9 shows the Lock residence monitoring locationwhilst Figure 10 shows the view looking north towards the proposed desalination plant location.5.1.4 Turner ResidenceThe Turner residence is located south of the proposed desalination plant location. Noise logging wasundertaken near the residence on the property. Figure 7 shows the Turner residence monitoring locationwhilst Figure 8 shows the view looking north towards the proposed desalination plant location.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment15

Figure 3Cape Riche campsite monitoringlocationFigure 4Campsite location looking towardsthe intake pump station locationFigure 5 Moir residence monitoring location Figure 6 Moir residence monitoring locationlooking towards the intake pumpstation location61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment16

Figure 7 Lock residence monitoring location Figure 8 Lock residence monitoring locationlooking towards the desalinationplant locationFigure 9Turner residence monitoringlocationFigure 10 Turner residence monitoringlocation looking towards thedesalination plant locationAt each noise monitoring location, an environmental noise logger was deployed for two weeks and wasset to continuously record L A 1 , L A 10 , L A 90 and L A Eq noise levels at 15 minute intervals. The noise loggerwas calibrated before and after measurement. Table 4 provides details of the noise logger used.Table 4Sound level meter and environmental noise logger detailsSound level meterEnvironmental noise loggersModel Rion NL-21 ARL EL-315Serial No. 00776886 15299423, 15299424, 15299433,15299045Type Type 2 Type 2Calibration due date [5] 10 August 2009 21 September 2010, 12 March2010, 17 February 2009, 23August 2009Time interval 15-minutes 15-minutesFrequency weighting A weighted A weightedTime response Fast Fast5Note that calibration was undertaken in the field prior to any measurements taken on the instrument. Equipment calibration is alsoundertaken in the laboratory prior to sending equipment out for hire.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment17

As a quality assurance measure, short term noise monitoring was conducted at each noise loggerlocation at the commencement of each logging period. Noise monitoring was undertaken on 8 February2011 using a Rion NL-21 sound level meter, within current calibration. At each noise logging location, a15-minute sampling period was undertaken. The sound level meter was calibrated before and aftermeasurement and Table 4 provides details of the instrument used.5.2 Meteorological ConditionsDaily weather observations for the Bureau of Meteorology (BoM) Jacup automated weather station(AWS) were obtained for the 9 to 23 February 2011, as shown in Table 5 (BoM 2011). During attendednoise monitoring it was noted that the weather was mild with heavy cloud cover most of the time, withoccasional drizzle periods.Table 5DateMeteorological data for Jacup AWSTemperature(ºC)Wind speed(m/s)Wind direction(degrees)09:00 15:00 09:00 15:00 09:00 15:00Rain(mm)9 February 2011 18.7 23.3 10.8 3.6 140 160 10.210 February 2011 17.7 20.3 6.1 6.7 170 110 0.811 February 2011 16.6 19.2 8.6 9.2 110 110 2.012 February 2011 15.3 18.6 9.2 8.6 90 100 7.813 February 2011 16.0 22.0 7.2 9.2 80 110 0.214 February 2011 15.5 20.6 5.8 6.1 70 70 015 February 2011 18.9 29.0 9.2 5.0 160 110 016 February 2011 18.0 19.7 8.3 7.2 120 120 017 February 2011 17.1 19.9 9.7 7.2 110 110 1.818 February 2011 16.9 25.0 10.8 3.6 60 40 1.819 February 2011 20.9 20.4 4.7 7.2 210 150 020 February 2011 15.7 17.8 8.3 7.2 90 100 0.221 February 2011 16.4 27.5 8.3 5.0 70 110 022 February 2011 18.9 27.7 6.1 6.7 60 100 0.25.3 Attended Noise Monitoring ResultsAttended noise monitoring and observations indicate a noise environment surrounding Cape Richetypical of a coastal area, with the main noise sources associated with occasional vehicles on Cape RicheRoad, noise from waves crashing on rocks, wind in trees and agricultural livestock.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment18

The L A Max , L A 10 , L A 90 and L A Eq noise levels for each 15-minute measurement for each monitoringlocation are provided in Table 6. It should be noted that the conditions during attended monitoring werewindy and as such noise levels are mostly due to wind in trees and wind impacts upon recorded noiselevels.Table 6Attended noise monitoring results, dB(A)Location Time L A Max L A 10 L A Eq L A 90Cape Riche campsite 14:43 61 54 52 49Moir residence 13.54 63 47 45 42Lock residence 11:33 61 49 46 41Turner residence 12:19 60 50 47 415.4 Noise Logging ResultsNoise logging was undertaken at the four sensitive receptors between 9 and 22 February 2011, a periodof 14 days. Results from noise logging at Cape Riche campsite and Moir, Lock and Turner residencesare shown in Appendix A. Appendix A shows the L A 1 , L A 10 , L A 90 and L A Eq noise levels for the monitoringperiod. The corresponding meteorological conditions from Jacup AWS (precipitation, air temperature,relative humidity and wind direction and speed) for each site are also provided.The L A 90 and L A Eq day, evening and night levels for each monitoring location is shown in Table 7. Table 7also provides the rating background level (RBL) for each sensitive receptor. The RBL is defined as:The overall single figure background level representing each assessment period (day/evening/night) overthe whole monitoring period. It is defined as the median value of:– All the day assessment background levels over the monitoring period for the day (07:00 to19:00);– All the evening assessment background levels over the monitoring period for the evening (19:00to 22:00); or– All the night assessment background levels over the monitoring period for the night (22:00 to07:00).The wind speed for Jacup AWS (as shown in Appendix A) exceeds 5 m/s on a regular basis andoccasionally exceeds 10 m/s. Recognised noise monitoring procedures exclude high (>5 m/s) windspeeds in calculation of L A 90 and L A Eq values. As 33 of the 42 day, evening and night periods haverecorded wind speeds >5 m/s, calculation of L A 90 and L A Eq values was undertaken excluding windspeeds greater than 7 m/s which provided calculated values for all but nine day, evening or night periods.As wind speed at Jacup AWS is measured at a height of 10 m, 7 m/s at the Jacup AWS is roughlyequivalent to 5 m/s at the height of the noise logger microphone (1.5 m).61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment19

Table 7Noise logging results, dB(A)PeriodDay Evening Night07:00 - 19:00 19:00 - 22:00 22:00 - 07:00Noise descriptor L A 90 L A Eq L A 90 L A Eq L A 90 L A EqCape Riche campsite9 February 2011 43 47 44 47 43 4710 February 2011 44 47 46 48 47 4911 February 2011 - - - - - -12 February 2011 - - 53 54 53 5513 February 2011 52 53 - - 53 5514 February 2011 51 53 48 51 48 5015 February 2011 44 48 45 47 46 4916 February 2011 - - - - - -17 February 2011 50 52 51 53 50 5218 February 2011 47 49 48 51 44 4719 February 2011 41 45 45 47 50 5220 February 2011 50 51 - - 53 5521 February 2011 52 54 53 55 54 5622 February 2011 52 55 53 55 52 54RBL 50 51 48 51 50 5261/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment20

PeriodDay Evening Night07:00 - 19:00 19:00 - 22:00 22:00 - 07:00Noise descriptor L A 90 L A Eq L A 90 L A Eq L A 90 L A EqMoir residence9 February 2011 28 34 26 33 26 3110 February 2011 32 41 34 37 35 4211 February 2011 - - - - - -12 February 2011 - - 43 48 43 4613 February 2011 41 46 - - 43 4614 February 2011 40 43 36 39 37 4115 February 2011 30 38 30 34 34 3816 February 2011 - - - - - -17 February 2011 40 43 41 43 39 4718 February 2011 37 42 37 40 31 3819 February 2011 31 40 # # # #20 February 2011 # # # # # #21 February 2011 # # # # # #22 February 2011 # # # # # #RBL 35 42 36 39 36 4261/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment21

PeriodDay Evening Night07:00 - 19:00 19:00 - 22:00 22:00 - 07:00Noise descriptor L A 90 L A Eq L A 90 L A Eq L A 90 L A EqLock residence9 February 2011 32 48 30 39 28 3510 February 2011 40 51 40 48 39 4411 February 2011 - - - - - -12 February 2011 - - 48 55 44 5113 February 2011 38 50 - - 44 5114 February 2011 44 50 34 40 28 3615 February 2011 32 45 29 36 30 3816 February 2011 - - - - - -17 February 2011 44 50 41 48 36 4318 February 2011 38 46 40 46 28 3819 February 2011 38 49 43 48 43 4920 February 2011 46 53 - - 43 4921 February 2011 51 57 44 49 41 4822 February 2011 48 54 45 51 # #RBL 40 50 41 48 39 4461/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment22

PeriodDay Evening Night07:00 - 19:00 19:00 - 22:00 22:00 - 07:00Noise descriptor L A 90 L A Eq L A 90 L A Eq L A 90 L A EqTurner residence9 February 2011 31 40 31 34 29 3310 February 2011 33 42 32 38 33 3911 February 2011 - - - - - -12 February 2011 - - 44 54 50 5913 February 2011 47 55 - - 48 5614 February 2011 43 53 37 46 37 4515 February 2011 32 41 29 36 33 4316 February 2011 - - - - - -17 February 2011 39 48 41 50 35 4418 February 2011 39 48 44 50 30 3419 February 2011 35 42 34 39 38 4620 February 2011 39 47 - - 48 5521 February 2011 49 58 50 57 48 5522 February 2011 49 57 49 56 41 46RBL 39 48 39 48 38 46# No data available due to logger failure (flat battery).- No data available for the time period (wind speed >5 m/s for the entire period).Table 8 provides a summary of attended and unattended noise monitoring results at each sensitivereceptor. The reported value from attended monitoring is the noise level measured and the reportedvalue from unattended monitoring is the RBL noise level calculated from the two weeks of noise logging.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment23

Table 8Summary of attended and unattended noise monitoring, dB(A)PeriodDay Evening Night07:00 - 19:00 19:00 - 22:00 22:00 - 07:00Noise descriptor L A 90 L A Eq L A 90 L A Eq L A 90 L A EqCape Riche campsiteAttended 49 52 - - - -Unattended 50 51 48 51 50 52Moir residenceAttended 42 45 - - - -Unattended 35 42 36 39 36 42Lock residenceAttended 41 46 - - - -Unattended 40 50 41 48 39 44Turner residenceAttended 41 47 - - - -Unattended 39 48 39 48 38 465.5 Existing Noise EnvironmentNoise logging and field observations indicate that the ambient noise environment at monitoring locationswas typically described by intermediate background noise levels with intermittent noise contributionsfrom the following activities:Cape Riche campsite:– Occasional traffic on Sandalwood Road due to people using the beach;– Campsite occupants participating in recreational activities; and– Nature (waves on rocks, leaves rustling, wind in trees and birds and insects).Moir, Lock and Turner residences:– Occasional local traffic on Cape Riche Road;– Livestock; and– Nature (leaves rustling, wind in trees and birds and insects).61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment24

5.6 Receptor LocationsA number of receptors were identified in proximity to the Cape Riche Seawater Desalination Plant, aslisted in Table 9. The distance from the desalination plant and the intake pump station and the assignedL A 10 noise level used for assessment is provided for each receptor.Table 9Receptor locationsReceptor nameLocation (MGA 94)Easting(m)Northing(m)Desalinationplant (m)Distance fromIntakepumpstation (m)Assigned nighttime L A 10 level,dB(A)Cape Riche campsite 660,570 6,170,184 3,817 1,116 35Moir residence 660,857 6,169,143 4,013 564 35Lock residence 654,379 6,168,053 2,504 7,118 35Turner residence 657,083 6,167,253 1,919 4,782 3561/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment25

6. Construction Noise and Vibration Assessment6.1 Construction NoiseConstruction noise impacts associated with the Cape Riche Seawater Desalination Plant were estimatedusing the following distance attenuation relationship:SPL SWL 20log(d)10log(Q)11where:d = Distance between the source and receptor (m);Q = Directivity index (2 for a flat surface);SPL = Sound pressure level at the distance from the source (dB); andSWL = Sound power level of the source (dB).Typical noise levels produced by construction plant anticipated to be used on-site were sourced from AS2436 –2010 Guide to Noise and Vibration Control on Construction, Demolition and Maintenance Sitesand from GHD’s internal database.Propagation calculations take into account sound intensity losses due to spherical spreading, withadditional minor losses such as atmospheric absorption, directivity and ground absorption ignored in thecalculations. As a result, predicted received noise levels are expected to slightly overstate actualreceived levels and thus provide a measure of conservatism.Received noise produced by anticipated activities, during the construction of the Plant are shown inTable 10 for a variety of distances, with no noise barriers or acoustic shielding in place and with eachplant item operating at full power. The sound pressure levels shown are maximum levels produced whenmachinery is operated under full load.Other construction noise sources such as a concrete batching plant are expected to have similar soundpower levels to the noise sources shown in Table 10. The magnitude of off-site noise impact associatedwith construction will be dependent upon a number of factors:The intensity and location of construction activities;The type of equipment used;Existing local noise sources;Intervening terrain; andThe prevailing weather conditions.Construction machinery will move about the Plant site area, altering the directivity of the noise sourcewith respect to individual receptors. During any given period the machinery items to be used in the Plantarea will operate at maximum sound power levels for only brief stages. At other times the machinery mayproduce lower sound levels while carrying out activities not requiring full power. It is unlikely that allconstruction equipment would be operating at their maximum sound power levels at any one time.Finally, certain types of construction machinery will be present in the Plant area for only brief periodsduring construction.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment26

Table 10Predicted plant activity noise levels, dB(A)PlantEstimatedSWL, dB(A)Estimated SPL, dB(A) at distance (m)50 250 500 750 1,000 3,000 5,000Backhoe 104 62 48 42 39 36 26 22Backhoe (with auger) 106 64 50 44 41 38 28 24Bulldozer 108 66 52 46 43 40 30 26Compactor 113 71 57 51 48 45 35 31Compressor (silenced) 101 59 45 39 36 33 23 19Concrete agitator truck 109 67 53 47 44 41 31 27Concrete pump truck 108 66 52 46 43 40 30 26Concrete saw 117 75 61 55 52 49 39 35Concrete vibratory screed 115 73 59 53 50 47 37 33Crane (mobile) 104 62 48 42 39 36 26 22Excavator 107 65 51 45 42 39 29 25Front end loader 113 71 57 51 48 45 35 31Generator (diesel) 104 62 48 42 39 36 26 22Grader 110 68 54 48 45 42 32 28Hand tools (electric) 102 60 46 40 37 34 24 20Hand tools (pneumatic) 116 74 60 54 51 48 38 34Jack hammers 121 79 65 59 56 53 43 39Rock breaker 118 76 62 56 53 50 40 36Roller (vibratory) 108 66 52 46 43 40 30 26Scraper 116 74 60 54 51 48 38 34Truck (>20 tonnes) 107 65 51 45 42 39 29 25Truck (dump) 117 75 61 55 52 49 39 35Truck (water cart) 107 65 51 45 42 39 29 25Vehicle (light commercial, 4WD) 106 64 50 44 41 38 28 24Welder 105 63 49 43 40 37 27 23The closest sensitive receptors to any potential noise source during construction of the intake pumpstation is the Moir Homestead and Cape Riche campsite, approximately 560 m and 1,110 m,respectively, from the intake pump station. From Table 10, noise levels exceeding the day time L A 1061/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment27

assigned level of 45 dB(A) are possible for items of loud equipment (such as concrete saws and vibratoryscreeds, pneumatic hand tools, jack hammers, rock breakers, scrapers and dump trucks) used duringconstruction at both locations.During the construction of the desalination plant, all four sensitive receptors are in excess of 1,900 mfrom the construction site and it is unlikely that construction activities will be audible and cause nuisance,with only the loudest item, such as jack hammers, possibly exceeding the day time L A 10 assigned level of45 dB(A).Due to proximity of the Moir residence and Cape Riche campsite to construction works at the intakepump station, it is likely that construction activities will be audible and may cause nuisance. Therefore,inline with the Regulations, such activities that cause excessive noise should be limited to week days orSaturdays between 07:00 and 19:00. If out of hours construction work is required, a construction noisemanagement plan will be required to be prepared and submitted.6.2 Construction VibrationVibration impacts discussed essentially focus on potential structural damage to properties in closeproximity of the Plant area and/or potentially affected by construction activities. It is possible thatconstruction vibration will be perceived at times by local sensitive receptors. However, the level ofannoyance will depend on individuals.The separation distance between the potentially most impacted receptor (Moir residence) and siteconstruction activities is 560 m. However, it is possible that infrastructure and road works may be carriedout at smaller distances.The nature and levels of vibration emitted by the site will vary with the activities being carried out on site.Table 11 outlines typical vibration levels for different plant activities that may be generated on the Plantsite, sourced from the NSW Roads and Traffic Authority (RTA) Environmental Noise ManagementManual (RTA 2001).61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment28

Table 11Typical vibration levels for construction equipmentPlant itemPeak particle velocity at 10 m (mm/s)Backhoe 1.0Bulldozer 2.5-4.0Compactor (7 tonne) 5.0-7.0Front end loader 6.0-8.0Jack hammer 0.5Roller (15 tonne) 7.0-8.0Construction activity may result in varying degrees of ground vibration depending on the equipment usedand methods employed. Operation of construction equipment causes ground vibration which spreadthrough the ground and diminish in strength with distance. Buildings founded on the soil in the vicinity ofthe construction site respond to these vibrations with varying results, ranging from no perceptible effectsat the lowest levels, low rumbling and perceptible vibrations at moderate levels and slight buildingdamage at the highest levels.From Table 11, equipment proposed for site preparation and construction of the Plant will generate lowlevels of vibration which are unlikely to result in any vibration risks to structures. The lower limit forvibrations resulting in building damage of 5 mm/s is normally not exceeded by general constructionactivities at distances greater than 20 m from the nearest sensitive receptor.Given the distances involved between site works and the nearest receptors, vibrations affecting humancomfort and building integrity are not expected to be an issue.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment29

7. Operational Noise AssessmentThe objective of operational noise modelling is to determine the requirements enabling the Cape RicheSeawater Desalination Plant to achieve compliance with the night time L A 10 assigned level of 35 dB(A) atthe nearest sensitive receptors under neutral and adverse weather conditions. Note that these are themost stringent criterion applicable to noise emissions from the Plant.Noise modelling was undertaken using Computer Aided Noise Abatement (CadnaA) to predict the effectsof industrial noise generated by the Plant.7.1 Noise Modelling Software PackageCadnaA, by Datakustik, is a computer program for the calculation, assessment and prognosis of noiseexposure. CadnaA calculates environmental noise propagation according to ISO 9613-2 Attenuation ofSound During Propagation Outdoors Part 2: General Method of Calculation (ISO Standards 1996).CadnaA considers local topography, weather conditions, reflection, ground absorption, relevant buildingstructures, site sources and the location of the receptor areas to predicted received noise levels. Themethod specified in ISO 9613-2 consists specifically of octave-band algorithms (with nominal mid bandfrequencies from 31.5 Hz to 8 kHz) for calculating the attenuation of sound. The algorithms used in thismodel account for the following physical features:Geometrical divergence;Atmospheric absorption;Ground effect;Reflection from surfaces; andScreening by obstacles.In assessing meteorological conditions, the CONCAWE method has been applied instead of ISO 9613-2weather correction. Modelling results are based on available information provided and should only beused as a guide for comparative purposes.7.2 Noise Model Configuration7.2.1 Proposed Plant LayoutThe noise model developed for this assessment was based on the layout drawings as provided inAppendix B.7.2.2 Topography and Ground Absorption EffectsIn line with the proposed location of the Plant, the site and surrounding ground topography weremodelled using 5 m ground contours.A default ground absorption of 0.5 as specified in ISO 9613 was used in the modelling. In GHD’sexperience, this has generally been found to be appropriate for surrounding areas which arepredominantly cleared grassland and forested areas.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment30

7.2.3 Meteorological ConditionsThe meteorological conditions selected for the model can have a significant effect on the result. As such,EPA requires compliance with the assigned noise levels to be demonstrated for 98% of the time, duringday and night periods, for the month of the year in which the worst case weather conditions prevail (EPA2007). EPA specifies the use of the meteorological conditions outlined in Table 12.Table 12Meteorological conditions for noise modellingMeteorology Calm Worst caseDay and Night Day NightWind speed 0 m/s 4 m/s 3 m/sStability - E-class F-classTemperature 20C 20C 20CRelative humidity 70% 50% 50%As sensitive receptors are located in several directions from the intake pump station and desalinationplant, assessment under worst case wind direction for each receptor has been undertaken.7.2.4 Operational Noise SourcesAn inventory of operational noise sources is provided in Table 13. Note that items in red have not beenconsidered in the assessment at this stage for the reason stated in Table 13.Estimated sound power levels used in the model are presented in Table 14. Sound power levels weredetermined from one of the following:CadnaA sound power level calculation protocols;Sound power levels provided by design team;GHD’s internal database of sound power levels; or Engineering Noise Control (Bies and Hansen 2003).For the purposes of noise modelling, all sources are assumed to be operating continuously.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment31

Table 13Inventory of operational noise sourcesItem Source PowerconsumptionNo. of unitsTypeLocationLocationIndoor / Outdoor1 Seawater intake pump 520 @1,480rpm2 online,1 standbyTop mounted verticalshaft centrifugalSeawater intake pump stationOutdoor2 Travelling band screendrive2.5 kW 2 online Travelling bandscreens (3 mm)Seawater intake pump stationOutdoor3 Band screen washbooster pumpNot a major noise source4 Rapid mechanical mixerdriveNot a major noise source5 Backwash aircompressor14 kW 2 online Screw compressor Compressor and blower room(located in UF and RO building)Indoor6 Backwash air blower 28 kW 2 online Rotary air blower Compressor and blower room(located in UF and RO building)Indoor7 UF feed pump 132 kW 6 online,1 standbyVariable speed drive UF and RO building Indoor8 High pressure RO feedpump710 kW 6 online,1 standbyVariable speed drive UF and RO building Indoor9 RO feed booster pump 75 kW 6 online,1 standbyVariable speed drive UF and RO building Indoor10 Energy recovery device(ERD)- 30 online,5 standbyPressure exchange UF and RO building Indoor11 ERD feed booster pump 75 kW 6 online,1 standby12 RO flushing pump 75 kW 6 online,1 standbyVariable speed drive UF and RO building IndoorFixed speed drive UF and RO building Indoor61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment32

Item Source PowerconsumptionNo. of unitsTypeLocationLocationIndoor / Outdoor13 RO clean in place (CIP)pump14 UF and RO buildingventilation system15 Permeate (desalinatedwater) pump16 Submersible mixer drive(wastewater tank)10 kW 6 online,1 standbyNo information as yet630 kW 2 online,1 standbyNot a major noise sourceFixed speed drive UF and RO building IndoorVariable speed drive Process water pumping station Outdoor17 Thickener feed pump 40 kW 2 online,1 standby18 Supernatant return pump 75 kW 1 online,1 standbyFixed speed drive Dewatering area OutdoorFixed speed drive Dewatering area Outdoor19 Thickener drive14 m dia.20 Thickener scraper /mixer driveNo information as yetNot a major noise source21 Thickened sludge pump 10 kW 2 online,1 standby22 Centrifuge feed pump 1 kW 2 online,1 standbyFixed speed drive Dewatering building IndoorFixed speed drive Dewatering building Indoor23 Centrifuge drive 3 kW 2 online Fixed speed drive Dewatering building Indoor24 Sludge screw conveyordriveNo information as yet61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment33

Item Source PowerconsumptionNo. of unitsTypeLocationLocationIndoor / Outdoor25 Dewatering buildingventilation system26 Diesel generator(emergency power)No information as yet1 MW 1 online Diesel genset West wall, RO and UF building Outdoor27 Heavy vehicles (deliveryand sludge removal)- 3 trucks Large articulated ornon articulated trucksEntrance gate, chemical storageand sludge removal areasOutdoor61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment34

Table 14Estimated sound power levels, dB(A)SourceHeight(m)Octave band centre frequency (Hz)Overall31.5 63 125 250 500 1k 2k 4k 8k dB(A) dBSeawater Intake Pump StationSeawater intake pump520 kWBand screen drive2.5 kWDesalination Plant – Ultra Filtration (UF) Pre TreatmentUF feed pump132 kWBackwash air compressor14 kW0 40 54 65 75 80 86 84 80 72 90 921.0 14 27 40 50 58 62 62 57 46 67 681.0 38 52 63 73 78 84 83 78 70 88 901.0 42 55 65 71 80 86 87 85 80 92 93Backwash air blower28 kW1.0 35 46 49 52 49 56 39 35 28 59 77Desalination Plant – Reverse Osmosis (RO)RO feed booster pump75 kWRO feed pump710 kWEnergy recovery device(ERD)ERD feed booster pump75 kW1.0 37 51 63 72 77 84 82 78 70 87 892.0 40 54 66 75 80 87 85 81 73 90 933.0 45 60 70 77 83 86 87 87 85 93 951.0 37 51 63 72 77 84 82 78 70 87 8961/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment35

SourceHeight(m)Octave band centre frequency (Hz)Overall31.5 63 125 250 500 1k 2k 4k 8k dB(A) dBRO flushing pump75 kWClean in place pump10 kWPermeate pump630 kW1.0 37 51 63 72 77 84 82 78 70 87 891.0 28 42 53 62 68 74 72 68 60 78 802.0 40 54 65 75 80 86 85 80 72 90 92Wastewater TreatmentThickener feed pump40 kWSupernatant return pump75 kWThickened sludge pump10 kWCentrifuge feed pump1 kWCentrifuge drive2.5 kW1.0 34 48 59 68 74 80 78 74 66 84 861.0 37 51 63 72 77 84 82 78 70 87 891.0 28 42 53 62 68 74 72 68 60 78 801.0 18 32 43 52 58 64 62 58 50 68 704.0 14 27 40 50 58 62 62 57 46 66 68Other SourcesHeavy vehicleDiesel generator3.0 66 76 85 93 101 96 95 90 84 104 1112.0 54 70 82 89 94 96 95 92 85 101 10561/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment36

Further to the above, CadnaA calculation protocols were used to determine internal noise levels inbuildings containing indoor sources (refer to Table 13). Internal noise level calculations were based on aconservative average 0.05 internal absorption coefficient (representing acoustically hard surfaces) andthe overall internal surface area of the subject buildings. Results are presented in Table 15.Table 15Estimated internal sound pressure levels, dB(A)BuildingCompressor and blowerroomUF and RO buildingSludge dewateringbuildingInternal noise level, dB(A)31.5 63 125 250 500 1k 2k 4k 8k Sum43 55 65 71 80 86 87 85 80 9144 59 69 76 82 86 86 86 83 9226 39 50 60 66 72 70 66 57 757.2.5 Building Details and Building Component Transmission LossBuildings and tanks that have potential to affect noise propagation by means of screening or reflectionhave been incorporated in the model with consideration to the Plant layout drawings. First orderreflections only were considered.Figure 11 shows the isometric view of the buildings and tanks included in the model. Non shadedbuildings and tanks are not noise sources and have been included in the model due to their affect onnoise propagation by screening or reflection.Process water tankUF and RO buildingAdminWorkshopCompressor andblower roomSludge dewateringFigure 11 Isometric view – Desalination plantThe RO and UF and sludge dewatering buildings were modelled as distinct area sources (i.e. radiatingwalls and roof) and are shaded blue (Figure 11). The sound power of such area sources is dependent on61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment37

the indoor noise levels within the building, the wall or roof sound transmission loss (in other terms, itscapacity to attenuate sound levels), absorption coefficient of internal surfaces and overall surface area.For the RO and UF building, the model accounted for all walls and roof surfaces. The compressor andblower room was model as all walls and roof, as part of the RO and UF building. For the sludgedewatering building, the model accounted for the roof and three walls, as the western wall is assumed asopen or partially open to allow for sludge disposal via conveyor.Based on review of the design drawings, the main building materials found on site would be steel wallcladding (1 mm thickness) and steel roofing (0.4 mm thickness). Table 16 presents the soundtransmission loss used in the assessment for each of the above.Table 16Transmission loss of building materials, dBBuildingcomponentOctave band centre frequency, Hz / Sound transmission loss, dB31.5 63 125 250 500 1k 2k 4k 8kR WSteel cladding 3 8 15 17 22 27 32 38 45 26Steel roofing 0 3 8 14 20 23 26 27 35 237.3 Noise Modelling ResultsPredicted night time L A 10 noise levels generated by Cape Riche Seawater Desalination Plant duringnormal operations at noise sensitive receptor locations for different meteorological conditions aresummarised in Table 17.Table 17Normal operations predicted night time L A 10 noise levels, dB(A)Receptor Neutral Worst caseWorst case winddirection (degrees) [6]Cape Riche campsite 11 15 130Moir residence 13 14 65Lock residence 12 18 60Turner residence 20 26 3507.3.1 Neutral Meteorological ConditionsNoise modelling was conducted under neutral meteorological conditions assuming all sources wereoperating continuously. Table 17 shows predicted night time L A 10 noise levels which comply with theassigned level of 35 dB(A) at all sensitive receptors under neutral meteorological conditions.The night time L A 10 noise level contour plot under neutral meteorological conditions is shown in Figure12. Figure 12 shows there are no exceedances of the night time assigned level of 35 dB(A) predicted atany sensitive receptors and compliance with 65 dB(A) at the Plant boundary is demonstrated for neutralmeteorological conditions.6Worst case wind direction from closest noise source (from pump station or desalination plant).61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment38

7.3.2 Worst Case Meteorological ConditionsNoise modelling was conducted under worst case meteorological conditions (temperature inversions)(Table 12) for worst case wind directions for each sensitive receptor (Table 17). Table 17 showspredicted night time L A 10 noise levels which comply with the assigned level of 35 dB(A) at all sensitivereceptors under worst case meteorological conditions.Night time L A 10 noise level contour plots under worst case meteorological conditions for Cape Richecampsite and Moir, Lock and Turner residences are shown in Figure 13, Figure 14, Figure 15 and Figure16, respectively.These figures show there are no exceedances of the night time assigned level of 35 dB(A) predicted atany sensitive receptors and compliance with 65 dB(A) at the Plant boundary is demonstrated.Noise modelling suggest that predicted noise levels generated by the Cape Riche Seawater DesalinationPlant are below the relevant night time assigned level of 35 dB (A) at Cape Riche campsite and Moir,Lock and Turner residences and the assigned level of 65 dB(A) at the Plant boundary.Based on the information provided and the model predicted night time noise levels, no additionalmitigation measures are recommended for the operation of the Plant.7.3.3 Non Routine OperationsWaste sludge will be generated by screening at the intake pump station and from sludge dewatering atthe desalination plant. Waste sludge will be removed off site by waste trucks. Water treatment chemicalswill also need to be delivered by truck. Typically, heavy vehicle movements will be scheduled such thatthey do not occur during night periods. However, on occasions, heavy vehicle movements may berequired and as such would be described as non routine operations.The Cape Riche Seawater Desalination Plant will operate continuously to provide process water to theSouthdown mine. Non routine operation of the Plant would result from loss of electrical power or thefailure of one or more pumps, RO or UF trains. Plant design has allowed for standby pumps and standbyUF and RO trains and such standby units will be bought online when required. The total number ofpumps will not increase and therefore noise levels are not expected to increase.Loss of power to the Plant will result in shut down of the Plant. Operation of a diesel generator forprovision of emergency power (lighting etc) has been allowed for in the model predictions.As such, noise modelling has been completed for non routine operations consisting of heavy vehiclemovements and operation of the emergency diesel generator during night periods.Predicted night time L A 10 noise levels generated by the Plant during non routine operations at noisesensitive receptor locations for different meteorological conditions are summarised in Table 18.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment39

Table 18Non routine operations predicted night time L A 10 noise levels, dB(A)Receptor Neutral Worst caseWorst case winddirection (degrees) [7]Cape Riche campsite 23 29 130Moir residence 23 28 65Lock residence 18 25 60Turner residence 25 32 350Table 18 shows predicted night time L A 10 noise levels under non routine operation of the Plant whichcomply with the assigned level of 35 dB(A) at all sensitive receptors under neutral and worst casemeteorological conditions.7Worst case wind direction from closest noise source (from pump station or desalination plant).61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment40

PREDICTED NOISE LEVELS35 dB(A)40 dB(A)45 dB(A)50 dB(A)55 dB(A)60 dB(A)65 dB(A)70 dB(A)75 dB(A)80 dB(A)85 dB(A)90 dB(A)LEGENDNoise sensitive receptorPoint noise sourceSCALE0 1000 2000Metres (at A3)COPYRIGHTTHIS DOCUMENT IS AND SHALL REMAINTHE PROPERTYOF GHD PTY LTDTHIS DOCUMENT MAY ONLY BE USEDFOR THE PURPOSE FOR WHICH ITWAS COMMISSIONEDAND IN ACCORDANCEWITH THE TERMS OFENGAGEMENT FOR THE COMMISSION.CREATEDJFCHECKEDCEAPPROVEDDHMAP PROJECTION: Universal Transverse MercatorHORIZONTAL DATUM: Geocentric Datum of Australia (GDA)GRID:Map Grid of Australia 1994, Zone 50DATEFILE LOCATION08.04.2011 G:/61/26005/11/CADNA/DesalREVISION DRAWING NO.0NEUTRAL_NORMAL OPS.srfSOUTHDOWN MAGNETITEPROJECTCAPE RICHE SEAWATERDESALINATION PLANTNoise and VibrationAssessmentPREDICTED NIGHT TIME NOISE LEVELSNORMAL OPERATIONSNoise contours: LA 10Grid height: 1.5 mNeutral meteorological conditionsFIGURE 12

PREDICTED NOISE LEVELS35 dB(A)40 dB(A)45 dB(A)50 dB(A)55 dB(A)60 dB(A)65 dB(A)70 dB(A)75 dB(A)80 dB(A)85 dB(A)90 dB(A)LEGENDNoise sensitive receptorPoint noise sourceSCALE0 1000 2000Metres (at A3)COPYRIGHTTHIS DOCUMENT IS AND SHALL REMAINTHE PROPERTYOF GHD PTY LTDTHIS DOCUMENT MAY ONLY BE USEDFOR THE PURPOSE FOR WHICH ITWAS COMMISSIONEDAND IN ACCORDANCEWITH THE TERMS OFENGAGEMENT FOR THE COMMISSION.CREATEDJFCHECKEDCEAPPROVEDDHMAP PROJECTION: Universal Transverse MercatorHORIZONTAL DATUM: Geocentric Datum of Australia (GDA)GRID:Map Grid of Australia 1994, Zone 50DATEFILE LOCATION08.04.2011 G:/61/26005/11/CADNA/DesalREVISION DRAWING NO.0CAMPSITE_NORMAL OPS.srfSOUTHDOWN MAGNETITEPROJECTCAPE RICHE SEAWATERDESALINATION PLANTNoise and VibrationAssessmentPREDICTED NIGHT TIME NOISE LEVELSNORMAL OPERATIONSNoise contours: LA 10Grid height: 1.5 mWorst case meteorological conditions -Winds blowing towards Cape Riche campsiteFIGURE 13

PREDICTED NOISE LEVELS35 dB(A)40 dB(A)45 dB(A)50 dB(A)55 dB(A)60 dB(A)65 dB(A)70 dB(A)75 dB(A)80 dB(A)85 dB(A)90 dB(A)LEGENDNoise sensitive receptorPoint noise sourceSCALE0 1000 2000Metres (at A3)COPYRIGHTTHIS DOCUMENT IS AND SHALL REMAINTHE PROPERTYOF GHD PTY LTDTHIS DOCUMENT MAY ONLY BE USEDFOR THE PURPOSE FOR WHICH ITWAS COMMISSIONEDAND IN ACCORDANCEWITH THE TERMS OFENGAGEMENT FOR THE COMMISSION.CREATEDJFCHECKEDCEAPPROVEDDHMAP PROJECTION: Universal Transverse MercatorHORIZONTAL DATUM: Geocentric Datum of Australia (GDA)GRID:Map Grid of Australia 1994, Zone 50DATEFILE LOCATION08.04.2011 G:/61/26005/11/CADNA/DesalREVISION DRAWING NO.0MOIR_NORMAL OPS.srfSOUTHDOWN MAGNETITEPROJECTCAPE RICHE SEAWATERDESALINATION PLANTNoise and VibrationAssessmentPREDICTED NIGHT TIME NOISE LEVELSNORMAL OPERATIONSNoise contours: LA 10Grid height: 1.5 mWorst case meteorological conditions -Winds blowing towards Moir residenceFIGURE 14

PREDICTED NOISE LEVELS35 dB(A)40 dB(A)45 dB(A)50 dB(A)55 dB(A)60 dB(A)65 dB(A)70 dB(A)75 dB(A)80 dB(A)85 dB(A)90 dB(A)LEGENDNoise sensitive receptorPoint noise sourceSCALE0 1000 2000Metres (at A3)COPYRIGHTTHIS DOCUMENT IS AND SHALL REMAINTHE PROPERTYOF GHD PTY LTDTHIS DOCUMENT MAY ONLY BE USEDFOR THE PURPOSE FOR WHICH ITWAS COMMISSIONEDAND IN ACCORDANCEWITH THE TERMS OFENGAGEMENT FOR THE COMMISSION.CREATEDJFCHECKEDCEAPPROVEDDHMAP PROJECTION: Universal Transverse MercatorHORIZONTAL DATUM: Geocentric Datum of Australia (GDA)GRID:Map Grid of Australia 1994, Zone 50DATEFILE LOCATION08.04.2011 G:/61/26005/11/CADNA/DesalREVISION DRAWING NO.0LOCK_NORMAL OPS.srfSOUTHDOWN MAGNETITEPROJECTCAPE RICHE SEAWATERDESALINATION PLANTNoise and VibrationAssessmentPREDICTED NIGHT TIME NOISE LEVELSNORMAL OPERATIONSNoise contours: LA 10Grid height: 1.5 mWorst case meteorological conditions -Winds blowing towards Lock residenceFIGURE 15

PREDICTED NOISE LEVELS35 dB(A)40 dB(A)45 dB(A)50 dB(A)55 dB(A)60 dB(A)65 dB(A)70 dB(A)75 dB(A)80 dB(A)85 dB(A)90 dB(A)LEGENDNoise sensitive receptorPoint noise sourceSCALE0 1000 2000Metres (at A3)COPYRIGHTTHIS DOCUMENT IS AND SHALL REMAINTHE PROPERTYOF GHD PTY LTDTHIS DOCUMENT MAY ONLY BE USEDFOR THE PURPOSE FOR WHICH ITWAS COMMISSIONEDAND IN ACCORDANCEWITH THE TERMS OFENGAGEMENT FOR THE COMMISSION.CREATEDJFCHECKEDCEAPPROVEDDHMAP PROJECTION: Universal Transverse MercatorHORIZONTAL DATUM: Geocentric Datum of Australia (GDA)GRID:Map Grid of Australia 1994, Zone 50DATEFILE LOCATION08.04.2011 G:/61/26005/11/CADNA/DesalREVISION DRAWING NO.0TURNER_NORMAL OPS.srfSOUTHDOWN MAGNETITEPROJECTCAPE RICHE SEAWATERDESALINATION PLANTNoise and VibrationAssessmentPREDICTED NIGHT TIME NOISE LEVELSNORMAL OPERATIONSNoise contours: LA 10Grid height: 1.5 mWorst case meteorological conditions -Winds blowing towards Turner residenceFIGURE 16

7.4 Road Traffic Noise AssessmentConstruction of the Cape Riche Seawater Desalination Plant is likely to increase traffic on these roads bya very small amount, with up to ten truck movements per day expected and assuming the constructionwork force is transported to the site by bus, 20 bus movements per day. There would also be othercontractor vehicle movements.Operation of the Plant is likely to increase daily traffic only slightly with up to five trucks per day from theinward movement of materials, such as water treatment chemicals and removal of wastes, such assludge. In addition to heavy vehicle traffic, up to 25 light vehicle movements are anticipated due tocommuting staff.The increase in traffic due to construction and operation of the Plant is considered minimal and is notexpected to increase traffic noise significantly.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment46

8. Recommended Mitigation MeasuresThe assessment of predicted noise impacts from the Cape Riche Seawater Desalination Plant indicatesit is unlikely that assigned night time L A 10 noise levels will be exceeded at surrounding sensitivereceptors. This section outlines general mitigation measures which will be implemented during design,construction and operation of the Plant.8.1 Construction NoiseAssessment has demonstrated that during construction of the intake pump station, noise may be audibleat the nearest sensitive receptors. The following management and mitigation measures are available toameliorate construction noise impacts as far as practicable:All plant and equipment should be selected to minimise noise emissions, maintained in good repairand operated in accordance with the manufacturer’s instructions. All engine covers should be keptclosed while equipment is operating;All combustion engine plant, such as generators, compressors and welders should be checked toensure they produce minimal noise with particular attention to residential grade exhaust silencers;Fixed equipment (i.e. pumps, generators and air compressors) should be located as far aspracticable from noise sensitive receptors;Where practical, machines will be operated at low speed or power and will be switched off when notbeing used rather than left idling for prolonged periods;Machines found to produce excessive noise compared to industry best practice will be removed fromthe site or stood down until repairs or modifications can be made;Where practical, impact wrenches will be used sparingly within close proximity to sensitive receptors,with hand tools or quiet hydraulic torque units preferred. Metal to metal contact on material should beavoided where practical;Whenever possible, loading and unloading areas should be located as far as practicable from thenoise sensitive receptors and materials dropped from heights into or out of trucks should beminimised;Material dumps should be located as far as practicable from noise sensitive receptors;Vehicles will be kept properly serviced and fitted with appropriate mufflers. The use of exhaustbrakes will be eliminated, where practicable;Minimise reversing. Broadband reversing alarms (audible movement alarms) should be used for allsite equipment, subject to meeting occupational health and safety requirements;Where practical, vehicular movements to and from the construction site should be undertaken duringnormal working hours. Information to be provided to truck drivers outlining designated vehicle routes,parking locations and delivery hours. Activities that cause excessive noise should be limited to week days between 07:00 and 19:00.In addition, all site workers should be sensitised to the potential for noise impacts and encouraged totake practical and reasonable measures to minimise the impact during the course of their activities.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment47

8.2 Operational NoiseAlthough noise levels are predicted to comply with assigned noise levels, the following design strategiescan be considered and incorporated into the detailed design of the Plant:Selection of plant, equipment and vehicles to limit noise emission where possible. All plant,equipment and vehicles on site to be kept properly serviced and fitted with appropriate mufflers;Plant, equipment and vehicles found to produce excessive noise to be removed from the site orstood down until repairs or modifications can be made;Purpose built acoustic enclosures will be provided where required for large plant items in order toachieve noise levels of less than 85 dB(A) at 1 m, consistent with occupational health and safetyrequirements; andSelection of equipment and plant items to limit noise emissions. Where practical and feasible, motordrives, gearboxes, pumps etc would be specified and selected to achieve a noise level of less than85 dB(A) at a distance of 1 m.8.2.1 Road Traffic NoiseWith regard to potential traffic noise, by keeping plant related vehicles serviced, fitted with mufflers andeliminating exhaust brake usage, noise due to trucking activity associated with the operation andconstruction of the Plant can be significantly mitigated.8.3 Noise ComplaintsA procedure for dealing with noise complaints should be developed during construction, commissioningand operation of the Plant. The noise complaint procedure should include the following:The local community should be notified of any unusual activities that may generate higher than usualnoise levels. This may include night works during construction; andA community liaison phone number and permanent site contact number should be established andmade available to nearby residents and other noise sensitive receptors so that noise relatedcomplaints can be received and addressed in a timely manner.In the event that noise complaints are received, prompt follow-up will be required as follows:Determine whether any unusual activities were taking place at the time of the complaint that mayhave generated higher noise levels than usual;Conduct noise monitoring at the location of the complainant; andIf noise levels are excessive, or above environmental authority conditions, implement noise mitigationand amelioration measures. These may include:– Use of earth mounds to block noise;– Review of locations of haul routes and other noise generating activities to move noise sourcesfurther away from the complainant; and– Additional acoustic shielding of stationary noise generating equipment.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment48

9. ConclusionsNoise modelling has demonstrated that predicted noise levels generated by the Cape Riche SeawaterDesalination Plant during normal operations under neutral and worst case meteorological conditions arebelow the night time assigned L A 10 noise level of 35 dB(A) at all sensitive receptors and the assignedlevel of 65 dB(A) at the Plant boundary. Noise modelling has also demonstrated that predicted noiselevels during non routine operations (such as heavy vehicle deliveries during night periods) under neutraland worst case meteorological conditions are below the night time assigned L A 10 noise level of 35 dB(A)at all sensitive receptors.Based on the information provided and model predicted noise levels, no additional mitigation measuresare recommended for operation of the Plant.Noise impacts associated with construction of the intake pump station are likely to be audible and maycause nuisance at Moir residence and to a lesser extent at the Cape Riche campsite. Inline with theRegulations, activities that cause excessive noise will be limited to week days or Saturdays between07:00 and 19:00. Noise impacts associated with construction of the desalination plant are unlikely to beaudible or to cause nuisance.Assessment of vibration due to construction of the intake pump station or desalination plant concludedthat vibrations affecting human comfort or building integrity were not expected to be an issue.The increase in traffic due to construction and operation of the Plant is small when compared againstcurrent traffic volumes. Therefore the traffic generated due to operation of the Plant is not expected toincrease traffic noise significantly.Therefore based on the information provided and assessment of results it is expected that the Plant canmeet relevant noise goals.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment49

10. LimitationsThis Report for Southdown Magnetite Project – Cape Riche Seawater Desalination Plant – Noise andVibration Assessment (“Report”):1. Has been prepared by GHD Pty Ltd (“GHD”) for Grange Resources (“Grange”) for the purposes ofapprovals by State and Federal agencies;2. May only be used and relied on by Grange and relevant State and Federal approvals authorities;3. Must not be copied to, used by, or relied on by any person other than Grange or State and Federalapprovals authorities without the prior written consent of GHD; and4. May only be used for the purpose of investigation and analysis to determine the noise andvibration impacts from operation of the Southdown Magnetite Project – Cape Riche SeawaterDesalination Plant (and must not be used for any other purpose).GHD and its servants, employees and officers otherwise expressly disclaim responsibility to any personother than Grange arising from or in connection with this Report.To the maximum extent permitted by law, all implied warranties and conditions in relation to the servicesprovided by GHD and the Report are excluded unless they are expressly stated to apply in this Report.The services undertaken by GHD in connection with preparing this Report were limited to thosespecifically detailed in Section 1.2 of this Report. It is not the intention of the assessment to cover everyelement of the acoustical environment, but rather to conduct the assessment with consideration to theprescribed work scope.In conducting this assessment and preparing the report, current guidelines for noise were referred to,including Guidance for the Assessment of Environmental Factors – No. 8 - Environmental Noise – Draft(EPA 2007) and the Environmental Protection (Noise) Regulation 1997.GHD accepts no responsibility for the integrity of the software coding of the approved acoustic model(CadnaA) used.GHD has prepared this Report on the basis of information provided by Grange, which GHD has notindependently verified or checked (“Unverified Information”) beyond the agreed scope of work.GHD expressly disclaims responsibility in connection with the Unverified Information, including (but notlimited to) errors in, or omissions from, the Report, which were caused or contributed to by errors in, oromissions from, the Unverified Information.Subject to the paragraphs in this section of the Report, the opinions, conclusions and anyrecommendations in this Report are based on conditions encountered and information reviewed at thetime of preparation.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment50

ReferencesBies D A and Hansen C H, 2003. Engineering Noise Control - 3rd Edition. London, 2003.BoM (Bureau of Meteorology), 2011. Jacup (Jerramungup District), Western Australia April 2011 DailyWeather Observations. Accessed via http://www.bom.gov.au/climate/dwo/IDCJDW6058.latest.shtml. 15February 2011.EPA (Environmental Protection Authority), 2007. Guidance for the Assessment of Environmental Factors– No. 8 - Environmental Noise – Draft, Perth, May 2007.Grange Resources/Sojitz, 2010. Southdown Magnetite and Kemaman Pellet Plant Project PrefeasibilityStudy. Section 7 – Infrastructure – Western Australia. Perth, October 2010.ISO Standards, 1996. ISO Standard 96132: 1996 Attenuation of Sound During Propagation OutdoorsPart 2: General Method of Calculation. Geneva, 1996.RTA (Roads and Traffic Authority), 2001. Environmental Noise Management Manual, Sydney, December2001.WAPC (West Australian Planning Commission), 2009. State Planning Policy 5.4 – Road and RailTransport Noise and Freight Considerations in Land Use Planning. Accessed viahttp://www.planning.wa.gov.au/Plans+and+policies/Publications/1992.aspx, 15 February 2011.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment51

Appendix ANoise Logging ResultsCape Riche campsiteMoir residenceLock residenceTurner residence61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment

8070Sound Pressure Level, dB(A)605040302009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / Time0:003:006:009:0012:0015:0018:0021:000:003:006:00LA1 (dB(A)) LA10 (dB(A)) LA90 (dB(A)) LAEq (dB(A))9:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:001001.6Air Temperature (°C) / Relative Humidity (%)9080706050403020101.41.21.00.80.60.40.2Hourly Precipitation (mm)00:003:0009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20116:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:00Date / Time21:000:003:006:009:0012:0015:00Precipitation (mm) Air Temp (oC) Rel Hum (%)18:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000.01236010270Wind Speed (m/s)864218090Wind Direction (degrees)009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / Time0Wind DirectionWind Speed (m/s)Figure A1 Noise logging results for Camp Riche campsite - Week 1 (9-15 February 2011)

8070Sound Pressure Level, dB(A)605040302016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / TimeLA1 (dB(A)) LA10 (dB(A)) LA90 (dB(A)) LAEq (dB(A))1002.0901.8Air Temperature (°C) / Relative Humidity (%)80706050403020101.61.41.21.00.80.60.40.2Hourly Precipitation (mm)00:003:006:0016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20119:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:00Date / Time21:000:003:006:009:0012:00Precipitation (mm) Air Temp (oC) Rel Hum (%)15:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000.01236010270Wind Speed (m/s)864218090Wind Direction (degrees)016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / Time0Wind DirectionWind Speed (m/s)Figure A2 Noise logging results for Cape Riche campsite - Week 2 (16-22 February 2011)

8070Sound Pressure Level, dB(A)60504030200:003:0009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20116:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:00Date / Time18:0021:000:003:006:009:0012:0015:0018:0021:000:003:00LA1 (dB(A)) LA10 (dB(A)) LA90 (dB(A)) LAEq (dB(A))6:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:001002.0901.8Air Temperature (°C) / Relative Humidity (%)80706050403020101.61.41.21.00.80.60.40.2Hourly Precipitation (mm)00:0009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20113:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:00Date / Time15:0018:0021:000:003:006:009:0012:0015:0018:0021:00Precipitation (mm) Air Temp (oC) Rel Hum (%)0:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000.01236010270Wind Speed (m/s)86418090Wind Direction (degrees)200:003:006:0009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20119:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:00Date / Time3:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000Wind DirectionWind Speed (m/s)Figure A3 Noise logging results for Moir residence - Week 1 (9-15 February 2011)

8070Sound Pressure Level, dB(A)605040302016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / TimeLA1 (dB(A)) LA10 (dB(A)) LA90 (dB(A)) LAEq (dB(A))1002.0901.8Air Temperature (°C) / Relative Humidity (%)80706050403020101.61.41.21.00.80.60.40.2Hourly Precipitation (mm)016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / Time0.0Precipitation (mm) Air Temp (oC) Rel Hum (%)1236010270Wind Speed (m/s)864218090Wind Direction (degrees)016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/201100:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / TimeWind DirectionWind Speed (m/s)Figure A4 Noise logging results for Moir residence - Week 2 (16-22 February 2011)

8070Sound Pressure Level, dB(A)60504030200:003:0009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20116:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:00Date / Time18:0021:000:003:006:009:0012:0015:0018:0021:000:003:00LA1 (dB(A)) LA10 (dB(A)) LA90 (dB(A)) LAEq (dB(A))6:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:001002.0901.8Air Temperature (°C) / Relative Humidity (%)80706050403020101.61.41.21.00.80.60.40.2Hourly Precipitation (mm)00:003:0009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20116:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:00Date / Time18:0021:000:003:006:009:0012:0015:00Precipitation (mm) Air Temp (oC) Rel Hum (%)18:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000.01236010270Wind Speed (m/s)864218090Wind Direction (degrees)009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / Time0Wind DirectionWind Speed (m/s)Figure A5 Noise logging results for Lock residence - Week 1 (9-15 February 2011)

8070Sound Pressure Level, dB(A)60504030200:003:0016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20116:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:00Date / Time18:0021:000:003:006:009:0012:0015:0018:0021:000:003:00LA1 (dB(A)) LA10 (dB(A)) LA90 (dB(A)) LAEq (dB(A))6:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:001002.0901.8Air Temperature (°C) / Relative Humidity (%)80706050403020101.61.41.21.00.80.60.40.2Hourly Precipitation (mm)00:003:006:0016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20119:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:00Date / Time21:000:003:006:009:0012:0015:0018:0021:000:003:00Precipitation (mm) Air Temp (oC) Rel Hum (%)6:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000.012360Wind Speed (m/s)10864227018090Wind Direction (degrees)016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / Time0Wind DirectionWind Speed (m/s)Figure A6 Noise logging results for Lock residence - Week 2 (16-22 February 2011)

8070Sound Pressure Level, dB(A)605040302009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / TimeLA1 (dB(A)) LA10 (dB(A)) LA90 (dB(A)) LAEq (dB(A))1002.0Air Temperature (°C) / Relative Humidity (%)9080706050403020101.81.61.41.21.00.80.60.40.2Hourly Precipitation (mm)009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / TimePrecipitation (mm) Air Temp (oC) Rel Hum (%)0.01236010270Wind Speed (m/s)864218090Wind Direction (degrees)009/02/2011 10/02/2011 11/02/2011 12/02/2011 13/02/2011 14/02/2011 15/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / Time0Wind DirectionWind Speed (m/s)Figure A7 Noise logging results for Turner residence - Week 1 (9-15 February 2011)

8070Sound Pressure Level, dB(A)60504030200:003:006:0016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20119:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:00Date / Time6:009:0012:0015:0018:0021:000:003:006:009:00LA1 (dB(A)) LA10 (dB(A)) LA90 (dB(A)) LAEq (dB(A))12:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:001002.0901.8Air Temperature (°C) / Relative Humidity (%)80706050403020101.61.41.21.00.80.60.40.2Hourly Precipitation (mm)00:003:0016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20116:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:00Date / Time3:006:009:0012:0015:0018:0021:000:00Precipitation (mm) Air Temp (oC) Rel Hum (%)3:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000.012360Wind Speed (m/s)10864227018090Wind Direction (degrees)016/02/2011 17/02/2011 18/02/2011 19/02/2011 20/02/2011 21/02/2011 22/02/20110:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:000:003:006:009:0012:0015:0018:0021:00Date / Time0Wind DirectionWind Speed (m/s)Figure A8 Noise logging results for Turner residence - Week 2 (16-22 February 2011)

Appendix BLayout DrawingsIntake Pump StationDesalination Plant61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment

Appendix CGlossary of Noise Terminology61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment

Ambient noiseA-weightedBackgroundnoisedBdB(A)HzImpulsive noiseLevel of noise from all sources, including background noise from near and far andthe source of interest.A-weighted noise level has been filtered in such a way as to represent the way inwhich the human ear perceives sound. This weighting reflects the fact that thehuman ear is not as sensitive to lower frequencies as it is to higher frequencies. A-weighted sound level is described as L A dB.Noise level from sources other than the source of concern.Decibel is the unit that describes the sound pressure and sound power levels of anoise source. It is a logarithmic scale referenced to the threshold of hearing.Unit used to measure ‘A-weighted’ sound pressure levels.Units for frequency are known as Hertz.An impulsive noise source has a short-term banging, clunking or explosive sound.The quantitative definition of impulsiveness is:A variation in the emission of a noise where the difference between L A Peak and L A MaxSlow is more than 15 dB when determined for a single representative event.L A SlowL A FastL A PeakL A MaxL A 1L A 10L A 90L A EqL A Max assignedlevelL A 1 assignedlevelThis is the noise level in decibels, obtained using A-weighting and S time weightingas specified in AS1259.1-1990. Unless assessing modulation, all measurements usethe slow time weighting characteristic.This is the noise level in decibels, obtained using A-weighting and F time weightingas specified in AS1259.1-1990. This is used when assessing the presence ofmodulation only.This is the maximum reading in decibels using A-weighting and P time weighting asspecified in S1259.1-1990.L A Max level is the maximum A-weighted noise level during a particular measurement.L A 1 level is the A-weighted noise level which is exceeded for 1% of the measurementperiod and is considered to represent the average of the maximum noise levelsmeasured.L A 10 level is the A-weighted noise level which is exceeded for 10% of themeasurement period and is considered to represent the intrusive noise level.L A 90 level is the A-weighted noise level which is exceeded for 90% of themeasurement period and is considered to represent the background noise level.The equivalent steady state A-weighted sound level (‘equal energy’) in decibelswhich, in a specified time period, contains the same acoustic energy as the timevaryinglevel during the same period. It is considered to represent the average noiselevel.Means an assigned level which, measured as a L A Slow value, is not to be exceededat any time.Means an assigned level which, measured as a L A Slow value, is not to be exceededfor more than 1% of the representative assessment period.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment

L A 10 assignedlevelLinearL Linear, PeakMaximumdesign soundlevelModulatingnoiseOne-thirdoctave bandPeak velocityRatingbackgroundlevel (RBL)RepresentativeassessmentperiodReverberationtimeRMSSatisfactorydesign soundlevelMeans an assigned level which, measured as a L A Slow value, is not to be exceededfor more than 10% of the representative assessment period.Sound levels measured without any weightings are referred to as ‘linear’ and theunits are expressed as dB(lin).Maximum reading in decibels obtained using P-time-weighting characteristic asspecified in AS 1259.1-1990.The level of noise above which most people occupying the space start to becomedissatisfied with the level of noise.A modulating source is regular, cyclic and audible and is present for at least 10% ofthe measurement period. The quantitative definition of modulation is:A variation in the emission of noise that -5. Is more than 3 dB L A Fast or is more than 3 dB L A Fast in any one-third octaveband;6. Is present for at least 10% of the representative assessment period; and7. Is regular, cyclic and audible.Means a band of frequencies spanning one-third of an octave and having a centrefrequency between 25 Hz and 20,000 Hz inclusive.Level of vibration velocity measured as a non-RMS quantity in mm/s.The overall single-figure background level representing each assessment period(day/evening/night) over the whole monitoring period (as opposed to over each 24-hour period used for the assessment background level). This is the level used forassessment purposes. It is defined as the median value of:– All the day assessment background levels over the monitoring period for theday (07:00 to 19:00);– All the evening assessment background levels over the monitoring period forthe evening (19:00 to 22:00); or– All the night assessment background levels over the monitoring period for thenight (22:00 to 07:00).Means a period of time not less than 15 minutes and not exceeding four hours,determined by an inspector or authorised person to be appropriate for theassessment of a noise emission, having regard to the type and nature of the noiseemission.Of an enclosure, for a sound of a given frequency or frequency band, the time thatwould be required for the reverberantly decaying sound pressure level in theenclosure to decrease by 60 decibels.Root mean square level; used to represent the average level of a wave form such asvibration.The level of noise that has been found to be acceptable by most people for theenvironment in question and also to be not intrusive.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment

Sound pressurelevel (L P )Sound powerlevel (L W )Specific noiseTonal noiseThe sound pressure level of a noise source is dependent upon its surroundings(influenced by distance, ground absorption, topography, meteorological conditionsetc) and is what the human ear actually hears. Noise modelling predicts the soundpressure level from the sound power levels taking into account ground absorption,barrier effects, distance etc.Under normal conditions, a given sound source will radiate the same amount ofenergy, irrespective of its surroundings, being the sound power level. The soundpower level of a noise source cannot be directly measured using a sound level meterbut is calculated based on measured sound pressure levels at known distances.Noise modelling incorporates source sound power levels as part of the input data.Relates to the component of the ambient noise that is of interest. This can bereferred to as the noise of concern or the noise of interestA tonal noise source can be described as a source that has a distinctive noiseemission in one or more frequencies. An example would be whining or droning. Thequantitative definition of tonality is:The presence in the noise emission of tonal characteristics where the differencebetween -8. The A-weighted sound pressure level in any one-third octave band; and9. The arithmetic average of the A-weighted sound pressure levels in the twoadjacent one-third octave bands,is greater than 3 dB when the sound pressure levels are determined as L A eq,Tlevels where the time period T is greater than 10% of the representativeassessment period, or greater than 8 dB at any time when the sound pressurelevels are determined as L A Slow levels.This is relatively common in most noise sources.Vibrationvelocity levelThe RMS velocity of a vibration source over a specified time period, measured inmm/s.61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment

Chart of Noise Level DescriptorsTypical Noise Levels61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment

Chart of Noise Level DescriptorsTypical Noise Levels61/26005/11/105911 Southdown Magnetite Project - Cape Riche Seawater Desalination PlantNoise and Vibration Assessment