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• identification of the main heavy metal pollution sources arising from the historical and ongoing mining activities in the catchment; • estimates of the amounts of heavy metals that would enter a proposed storage; • modelling of the heavy metals within a proposed storage; • the status of the biota in the river systems and assessment of the effect of heavy metals on the biota; and • proposed methods of reducing pollution off the lease site to acceptable levels. Based on these studies, the dam and power station are located upstream of the Queen River tributary that delivers tailings to the lower King River, but acid drainage off the lease site into the proposed storage would occur. Diversion works were undertaken on the lease site to address this occurrence, and are described in Section 6. Although in 1983 Hydro Tasmania was not required to prepare environmental impact statements, the business voluntarily prepared an Environmental Management Plan for the construction of the King scheme. This was the first hydro-power scheme built in Australia to have a formal Environmental Management Plan, and this plan influenced the design and construction activities for the development. An Environmental Committee was formed for the construction period to ensure that unnecessary impacts were avoided and unavoidable ones were minimised and treated. The power scheme is located very close to the Tasmanian Wilderness World Heritage Area. In recognition of this, great care was taken to minimise visual damage to the landscape. Measures in the Environmental Management Plan to minimise visual impact included: • siting temporary access tracks, camps, works areas and quarries for rockfill below minimum water levels so they would not be visible after commissioning; • placing excess road spoil and material from other engineering works below minimum water levels; • locating permanent roads and structures as unobtrusively as possible including: − reducing the size of roadside excavations (batters); − more closely spacing horizontal steps in the batters to allow greater coverage by vegetation; − having a single lane road (rather than two lanes); and − lowering the design speed of the road; • stockpiling of peat and topsoil removed in the constructio n process for reuse during restoration and revegetation of road cuttings, spoil dumps and disturbed areas; • using native species for revegetation; • developing hydro-mulching strategies effective in the local environment for the revegetation of rocky or steep areas; • salvaging timber from the storage area before commissioning to avoid unsightly dead trees and hazards for boats using the lake; and • using materials for and siting the transmission line to make it as visually unobtrusive as possible. Further environmental issues addressed in the Environmental Management Plan included:PDF Image | Organisations in Different Renewables
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