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Public Information Booklet 5. Questions and Answers The answers in this section were provided by Woodside and consequently there may be instances where further discussion between the State and Traditional Owners will be required before a final position is reached. 5.1. Northern Versus Southern Site Locations Coastal Stabilisation and Retaining Walls Question ñ What is the extent of retaining walls required and how will sand dunes and pindan be managed? General Generally, there should be no requirement for retaining walls on the actual plant site itself for either a north or southern site. The aim is to work with 2-4 terraced levels. The process trains should be at the one level as far as possible. The aim would be to slope the side of the levelled area back to the natural surface with some rock stabilisation if the soils are likely to erode away due to rainfall runoff. This treatment is mainly in the pindan areas. The aim would be to balance the cut and fill volumes so that there are not excess quantities of material to dispose. If it is not possible to use the pindan in the plant earthworks, then it would be used for low level banks to help screen the plant. In this case the slopes will be fairly flat (like a natural hill) to avoid erosion and allow planting of local plants on the banks. Northern Site The pindan scarp (cliff) at the beach line to the north of James Price Point may need protection against cyclonic surge and wave actions. No studies have been carried out at this time, however, if protection is required, it is likely to be placed rock rather than concrete sea walls. These rock walls are likely to be parallel to the shore for a minimum of a few hundred metres (Figure 18). The northern site is likely to have pindan down to a deeper depth. This makes construction of the foundations for the LNG plant more difficult and is likely to result in a larger land area requirement to work and process this larger volume of pindan sand or the use of piles (i.e. drive pylons down to the harder rock). Southern Site In the sand dune areas, the intent is for minimum disturbance. Where it is necessary to cut through them for access and to build the storage tanks, the banks will be sloped and if necessary some rocks or other material placed to stabilise the slopes. However, no stabilisation is envisaged along the coast. 5279225 33
Public Information Booklet The thickness of pindan on the southern site is expected to be less than the north. Although there will be similar difficulties with foundations, the thinner layer should make it easier and require less land for managing and processing the pindan sand. Figure 18: Potential area requiring shore protection if a northern option is selected Dredging and Blasting Requirements Questions: � What is the relative duration of dredging for the 2 options (north and south) and what are the disposal site options? � What are the estimated blasting and dredging requirements? � What is the difference in the volume and duration of dredging in respect of the different location options? General It will be necessary to establish access for shipping to both the export jetties and the material offloading facility. This will require the dredging of a channel/ship turning basin and berth pocket at both the export jetty and material offloading facility. 5279225 34
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