8C Noise Design Assumptions and Source Data 8C.1 Construction Predicted noise levels at the nearest noise sensitive receptors from construction activities have been modelled and presented as noise contours, which can have been used to identify settlements that have potential to be significantly affected by noise during the construction of the port. The construction phase of the processing and infrastructure area has been separated into three separate phases Earthworks and General Constructions and will consist of the following noise relevant activities. Piling works: piling at the jetty. Earthworks & Dredging: clearing and site preparation for all areas including the rail loop; heavy earthworks, levelling, battering; pre-loading and ground treatments; an approach channels, turning circle and other manoeuvring areas to the export and service wharves, and MOF; removal of soft materials beneath marine structures; dredged material will be reused for reclamation or filling works; and road traffic transportation of construction materials (average 30 vehicles per hour). General Construction: assembly and erection of the car dumpers and rail yard; assembly of stackers and reclaimers; conveyor assembly and commissioning; construction of facilities, services, and infrastructure; and track laying on the rail loop. As detailed construction teams and methods are not known, a simplified approach of applying an overall sound power level for typical construction teams for the Earthworks and General construction scenarios and spread over the relevant work areas. A sound power level of 121 dba for Earthworks and 114 dba at any point on the site has been applied in the construction noise calculation. 8C.2 Operations 8C.2.1 Pioneering MOF Wharf structures and Quay Deck landing areas, will be built in stages to accommodate the following transport fleet: landing craft- 600 DWT; fuel barges- 3 650 DWT; general purpose barges- 2 000 DWT to 5 400 DWT; tugs and other small craft for ferrying personnel via sea to / from the offshore sites for marine construction works; heavy lift ships & RORO vessels 6 500 DWT to 13 750 DWT; and general cargo vessels Up to 8 000 DWT. 8C-1
8C.2.2 Operational MOF In the operational phase of the Project a MOF is required for unloading of equipment. It will be built to accommodate the following transport fleet: fuel barges- 3 650 DWT; heavy lift ships & RORO vessels 6 500 DWT to 13 750 DWT; and general cargo vessels Up to 8 000 DWT. 8C.2.3 Service Wharf A service wharf will be built immediately landward of the export Wharf. The Quay structure will be built to accommodate the following transport fleet: fuel tankers- 30 000 DWT to 50 000. The Quay structure will also include: jetty head and access roads; and pipelines for the transportation of diesel fuel. 8C.2.4 Tug harbour and Small Work Both Berths Tug services will support operations at the export Wharf. The berths for tugs will be located at the location of the MOF. Temporary tug mooring will be provided at the MOF. 8C.2.5 Stockyard Stockyard equipment specification and design is developed using the following design parameters. Total Stockyard capacity ~ 0.6 million tonnes. The export wharf will be built with the following noise relevant features: nominal throughput of 95 Mtpa; 2x Enclosed rotary car dumpers; car dumper reclaim conveyor 12 000 tph; 3x stackers- 7 700 tph; and 2x reclaimers- 12 500 tph. 8C.2.6 Operational Dredging and Operation Works Dredging and excavation works will include the maintenance dredging of approach channels for MOF and export wharf. 8C.2.7 Power Station The power station will operate continuously for 365 days per year and will include the following significant noise sources: the power plant will have a nominal capacity of 60MW; and all units are 5 MW units. 8C.3 Source Terms Source terms used in the model are shown in Table 8C.1. 8C-2
Table 8C.1 Port Noise Sources Modelled Design Sound Power Levels Port area Item Description Rated Capacity Quantity Unmitigated SWL dba Mitigation Applied Mitigated SWL dba Stockyard Stacker 9300 tph 3 (2 operating) 110 -- 110 Reclaimer 6600 tph 2 111 -- 111 Car Dumper 2 103 enclosed 103 Wagon noise through unloading cycle 78 dba/m Power station Engine generator 5 MW 12 -- Enclosed/ design to meet 70 dba at 95m 70 dba at 95m All Areas Conveyors Capacity Idler Roll Type Belt speed SWL dba Standard Stockyard Conveyor (open sided or covered) 7700 tph Steel 4.4 m/s 89 dba/m Reclaim conveyor 1800 kw 89 dba/m -- 89 dba/m Stacking conveyors 300 89 dba/m -- 89 dba/m Transfer conveyor 400 89 dba/m -- 89 dba/m Transfer station 100 100 All Areas Conveyor Drives Capacity Standard Conveyor Drives 450 kw -- 100 630 kw -- 101 800 kw -- 103 1000 kw -- 104 1200 kw 105 8C.3.1 Conformance Levels and Specifications Some items of plant consist of many components, and for the complete item to conform with a design emission level (sound power level), the component items need to meet specific sound power levels. Such items are: conveyors (idlers, belt, frames and frame spacing); and stackers, reclaimers, stacker / reclaimers and shiploaders (belt, idlers, long travel drives, boom drive, luffing and slewing mechanisms). Hence the source terms for these items are referred to a conformance specification which is reliant upon the individual item specifications. 8C.3.1.1 Idler-Rolls Idlers will need to meet the following specifications such that the conveyor can achieve the conformance specification. 8C-3
The specified idler-roll surface profile upper limiting criteria for the idler-roll surface profile parameters are shown in Table 8C.2. Table 8C.2 Idler-Roll Surface Profile Upper Limiting Criteria Criteria Surface Profile Parameter Upper Limit TIR Total indicator runout 600 m (pk-pk) MIS Maximum Indicated Slope (per 6 o of idler rotation) 60 m Notes: Total Indicator Runout - The Total Indicator Runout (TIR) is the peak to peak variation in roll eccentricity and out of round, measured in micrometers. Maximum Indicated Slope - The Maximum Indicated Slope (MIS) is defined for the purpose of this Specification as the maximum indicated runout per 6 of idler-roll rotation. Note that manual measurements of the MIS may be conducted using a similar test rig to that traditionally used to measure the TIR. The indicated runout displacements shall be determined from a continuous measurement around the idler-roll circumference. The largest difference in the indicated runout for any 6 of idler roll rotation yields the MIS measured in micrometers. 8C.3.1.2 Idler-Roll Self Noise The total sound power emission level of each idler-roll shall not exceed those shown in Table 8C.3 8C.3 at the design idler-roll rotational speed. This sound power level relates to the noise emission of each idler-roll operating in isolation from other conveyor components. Table 8C.3 Idler-Roll Self Noise Sound Power Level Idler-Roll Length Range 500 mm - 800 mm 68 dba 801 mm - 1100 mm 69 dba 1101 mm - 1500 mm 70 dba Overall Sound Power Level (dba re 1 W) 8C.3.1.3 Idler Frame Spacing Error! Reference source not found.figure 8C.1 shows the idler frames are built in standard modules consisting of variable spacing to minimise the occurrence of harmonics throughout the conveyor length. 8C-4
Figure 8C.1 Idler Frame Spacing 8C.4 Design Criteria, Included Embedded Mitigation, Procurement, Commissioning and Noise Management The included mitigation incorporated into the design of the Project will require certain specifications and management plans to be developed and implemented: the included mitigation incorporated into the design of the Project will require certain specifications and management plans to be developed and implemented; conformance specifications for conveyor drives conveyors, reclaimers, stackers and shiploaders; conformance specifications conveyors, reclaimer, stacker / reclaimers; conveyor idler specification; conveyor drive specification; and enclosed rotary car dumper. 8C-5