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• monitoring the fish populations and development of the trout fishery in the lake; and • assessing the effect of releases from the lake on water quality in the King River and Macquarie Harbour. The monitoring program included ongoing water, soil and sediment sampling; lake productivity measurements; and investigations into aspects of the fishery such as heavy metal levels in trout, distribution of fish in the lake, growth rates, physiological condition and reproductive success of the fish. By 1996 ongoing monitoring had established there were no major problems with either copper toxicity or the development of the Lake Burbury fishery. Testing by the Tasmanian IFCBC found that even though mean soluble copper concentrations were 2-3 times higher than recommended ANZECC levels, the toxicological response in fish was much less than predicted. This was attributed to the presence of high levels of naturally occurring dissolved organic matter in the water (creating the ‘tea’ colour associated with river systems on Tasmania’s west coast). Dissolved organic matter binds with copper, rendering it biologically unavailable, and so protects organisms from any toxic effect of this heavy metal. Based on these results, the remediation works described earlier were found to be adequate for the protection of a recreational fishery in Lake Burbury. Lake Burbury presently supports a successful recreational trout fishery, and Hydro Tasmania now conducts its own copper surveys on a routine basis to ensure these conditions do not deteriorate. Animal Rescue Program As the lake filled, Hydro Tasmania implemented an animal rescue program. For this program, the business created a fauna recovery team that removed stranded animals from islands. The rescued animals were relocated to suitable habitats in the surrounding area, thereby ensuring minimum casualties amongst the native species. Oxygen Levels in the Power Station Discharges Soon after commissioning of the power station in 1992, water containing very low levels of oxygen accompanied by hydrogen sulphide was noted in the tailrace, a common problem in the early life of a reservoir. The low level of oxygen was caused by thermal stratification in the reservoir. This resulted in the release of cold, de-oxygenated bottom water into the King River. After investigation and consideration of ameliorative measures, water discharged downstream from the power station was aerated by operation of a jet pump installed on the turbine. This is now utilised to increase dissolved oxygen concentrations at appropriate times. Ongoing and continuous monitoring of the water quality leaving the tailrace ensures adequate notice of low dissolved oxygen levels, and timely utilisation of the air injection facilities in the turbines. 8. SOCIAL BENEFITS During design and construction, significant community consultation took place with interested stakeholders including the people of Queenstown, those seeking access to the proposed lake, the local councils, the Mount Lyell mine, recreational fishermen interested in the potential for a trout fishery in Lake Burbury, and aquaculture interests in Macquarie Harbour. The power scheme provided a very welcome boost to local employment opportunities during construction, as the copper mining industry was winding down. With Queenstown so close to the scheme, Hydro Tasmania made increasing use of local labour and contractors.PDF Image | Organisations in Different Renewables
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