1 (LVRRS) Jacobs provided the Advisory Committee with an update on the work being undertaken to identify valued regional receptors and develop rehabilitation scenarios for consideration as part of the Latrobe Valley Regional Rehabilitation Strategy (LVRRS). Jacobs has been contracted by the Department of Economic Development, Jobs, Transport and Resources (DEDJTR) to deliver several key pieces of work in relation to the LVRRS including: Identify valued regional receptors and thresholds and metrics for those receptors Develop regional rehabilitation scenarios. Some of the key questions and issues that came through the scenario development workshops included: water fill levels of the mine voids in the pit lake scenarios pit lake connectivity access and use of the void and surrounding landform (particularly, what uses are excluded) timing of filling and rate of fill batter and pit wall form. Several scenarios have been developed for testing as part of the LVRRS. These vary from three low water level pit lakes to three full pit lakes, with a combination of low and high water fill levels across the three Latrobe Valley coal mines also to be tested. The LVRRS will qualitatively assess biophysical impacts on all recognised regional receptors and quantitatively assess biophysical impacts on recognised regional receptors with the potential to be materially impacted. It was asked how potential evolutions/developments that are anticipated but not yet confirmed, say for example the Traralgon Bypass, are being captured. Jacobs advised that if these evolutions/developments are approved but not yet in train they will be taken into account. Is there is enough water to be able to deliver both the three low level pit lakes and the three high level pit lake scenarios? For the low level scenarios, according to Jacobs, approximately 1,300 GL of water would be required while for the high level scenarios that number is close to 3,000 GL. This is a key question that the LVRRS is seeking to address. Dr Grace Mitchell advised that regarding this it is important to consider not only volumes required but rates of fill as well. The rate of fill is an important variable in looking at water availability across the catchment. The maximum fill option ought to be on the table and the discussion had regarding tradeoffs that would be required to achieve this option.
1 (LVRRS) Jacobs provided the Advisory Committee with an update on the work being undertaken to identify valued regional receptors and develop rehabilitation scenarios for consideration as part of the Latrobe Valley Regional Rehabilitation Strategy (LVRRS). Jacobs has been contracted by the Department of Economic Development, Jobs, Transport and Resources (DEDJTR) to deliver several key pieces of work in relation to the LVRRS including: Identify valued regional receptors and thresholds and metrics for those receptors Develop regional rehabilitation scenarios. Some of the key questions and issues that came through the scenario development workshops included: water fill levels of the mine voids in the pit lake scenarios pit lake connectivity access and use of the void and surrounding landform (particularly, what uses are excluded) timing of filling and rate of fill batter and pit wall form. Several scenarios have been developed for testing as part of the LVRRS. These vary from three low water level pit lakes to three full pit lakes, with a combination of low and high water fill levels across the three Latrobe Valley coal mines also to be tested. The LVRRS will qualitatively assess biophysical impacts on all recognised regional receptors and quantitatively assess biophysical impacts on recognised regional receptors with the potential to be materially impacted. It was asked how potential evolutions/developments that are anticipated but not yet confirmed, say for example the Traralgon Bypass, are being captured. Jacobs advised that if these evolutions/developments are approved but not yet in train they will be taken into account. Is there is enough water to be able to deliver both the three low level pit lakes and the three high level pit lake scenarios? For the low level scenarios, according to Jacobs, approximately 1,300 GL of water would be required while for the high level scenarios that number is close to 3,000 GL. This is a key question that the LVRRS is seeking to address. Dr Grace Mitchell advised that regarding this it is important to consider not only volumes required but rates of fill as well. The rate of fill is an important variable in looking at water availability across the catchment. The maximum fill option ought to be on the table and the discussion had regarding tradeoffs that would be required to achieve this option.