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Est. July 1997

Est. July 1997. Serving two council areas. 34,000 water customers. 30,000 sewerage customers. 3 Councillors Greater Taree. 3 Councillors Great Lakes. MidCoast Water. General Manager. Design And Construction. Strategic Planning. Operations. Corporate. 2 Off-Stream Dams 3 Weirs

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Est. July 1997

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  1. Est. July 1997

  2. Serving two council areas 34,000 water customers 30,000 sewerage customers

  3. 3 Councillors Greater Taree 3 Councillors Great Lakes MidCoast Water General Manager Design And Construction Strategic Planning Operations Corporate

  4. 2 Off-Stream Dams 3 Weirs 1 Borefield 4 Water Treatment Plants 34 Reservoirs 26 Water Pumping Stations 13 Sewerage Treatment Plants 180 Sewerage Pumping Stations

  5. Projected Capital Works Program $240 million over the next 30 years

  6. Major projects Manning Point Sewerage Scheme Tea Gardens Sewerage Strategy North Karuah Sewerage Scheme Taree/Wingham Effluent reuse Manning Water Treatment Plant (WTP) Nabiac borefield and WTP Hallidays Point Water Supply Upgrade

  7. Major projects Pacific Palms Wastewater Treatment Plant (WWTP) Stroud WWTP Upgrade Old Bar WWTP Upgrade Hallidays Point WWTP Upgrade Nabiac Water Supply Upgrade Harrington Water Supply Upgrade Tea Gardens WTP

  8. MCW's mission statement To manage provision of water supply and sewerage services to meet the needs of the community. All aspects of our business, as viewed by our customers, will be readily transparent, sustainable and provide best value for money

  9. MidCoast Water’s business The Water Cycle

  10. A risk assessment was undertaken on all villages with onsite sewerage systems in MidCoast Water's area of operations Background The risk assessment ranked villages based on downstream water uses, lot size, soil conditions and size of village From this risk assessment 'high risk' villages were invited to comment about their needs through a questionnaire

  11. Communities under investigation

  12. Onsite wastewater management In USA 25% of the population (65 million people) are served by onsite systems In Greater Taree City Council area 32% of the population (15,000 people) are served by onsite systems. In Great Lakes Council area 20% of the population (6,200 people) are served by onsite systems

  13. 2000 Questionnaire results A questionnaire was circulated by direct mail to all properties in the high risk village areas in early 2000

  14. Coomba Park 531 questionnaries issued and 19 % returned Water Supply Current water supply dominantly rainwater tanks (ratio 10:1) More residents were satisfied with their current onsite systems than not (ratio 4:1) marginally higher support for installation of reticulated water supply

  15. Coomba Park 531 questionnaries issued and 19 % returned Sewerage more residents were satisfied with their current onsite systems than not (ratio 3:1) equal numbers of residents satisfied/dissatisfied with existing town system higher support for installation of reticulated sewerage (ratio 5:4)

  16. Major Concerns Cost to consumers & ongoing rates Environmental impacts Disruptions Drinking water quality Estimated completion date Water and sewerage will encourage more development

  17. Existing stormwater water quality Coomba Park High levels of nitrogen High levels of pathogens low human input detected

  18. NSW Government Role & Subsidy NSW Government through the Dept of Land and Water Conservation regulates Local Government Water and Sewerage Operators in NSW The NSW Government provides subsidy for residential 'Backlog' sewage and water. 'Backlog' is defined as existing development as at 1996 with some allowance for growth up to 20%. Provision for additional growth or extension of the service area will be at full cost to the local authority

  19. The NSW Government's Small Towns Sewerage Program: Recognises the lack of economy of scale of small systems Facilitates more affordable sewerage services and thus reduce risks to public health and the environment. Is targeted at communities which have an urgent need for improved liquid waste management.

  20. The Program sets guidelines for: financial assistance and conditions applying options for lower cost technologies to provide affordable systems

  21. Villages Program MidCoast Water has applied for State Government funding to provide improved sewerage management for 9 villages in our region. Initial investigation funding was approved in May 2002 by DLWC and our program of implementing the investigation approved in October 2002 by DLWC

  22. Any questions?

  23. Work undertaken to date Evaluation of Collection systems for centralised systems Onsite system evaluation Water and Wastewater Treatment for centralised systems Assessment of effluent irrigation opportunities Reed bed technology & Wetland treatment Groundwater modelling for effluent discharge Compilation of viable options and risk assessment

  24. Major Issues In all the options for the villages we are examining there are 2 central issues: what happens with the treated effluent? where does the drinking water come from?

  25. For the environment

  26. For the environment

  27. For the environment

  28. For the environment

  29. For the environment

  30. For the environment

  31. What Option ?

  32. What Option ?

  33. What option?

  34. Sewerage

  35. A sewerage system consists of: • Collection and Transport • - A system of pipes, pumps and storages that allow waste to be collected and transported to the treatment location. • Treatment • A system where liquid wastes are treated to a standard suitable for the chosen effluent management system. • Effluent Management • - A system designed to return treated wastewater effluent to the environment by either discharge or reuse.

  36. Centralised Effluent Management ·        Land based irrigation re-use ·        Urban non-potable re-use ·        Sand dune exfiltration / groundwater re-charge ·        Ocean release outfall ·        River, lake or port discharge ·        Connect to existing treatment and use its effluent management system (one of the above)

  37. Land Based Irrigation Re-Use ·        Local climatic conditions ·        Soil properties – Physical, chemical & biological ·        Groundwater characteristics ·        Presence of surface water bodies ·        Topography ·        Size of wet weather storage to limit effluent discharge ·        Urban reuse

  38. Sand dune exfiltration/groundwater recharge ·       Local soil must be sand or other rapid draining soil ·       Hydraulic properties ·       Groundwater characteristics – high quality groundwater

  39. Direct discharge to ocean/river/port ·       Aquaculture industries and environment ·       Flushing characteristics ·       Nutrients       

  40. Decentralised effluent management ie onsite systems ·       Surface Irrigation ·       Sub surface Irrigation ·       Absorption trench  ·       Evapotranspiration · Reuse in toilet flushing waters ·       Road tanker pump-out

  41. Any questions?

  42. Centralised Treatment Systems Conventional Wastewater Treatment Plants (WWTP) High chemical and power consumption Small area footprint Constructed Wetland and Lagoon treatment systems Low chemical and power consumption Large area footprint Effluent quality target to suit effluent management system

  43. Constructed Wetland for effluent polishing: ·        Local climatic conditions ·        Soil properties – Physical, chemical & biological ·        Groundwater characteristics ·        Topography ·        Size of wetland to achieve water quality

  44. Decentralised Treatment Systems Conventional Septic Tank systems can be improved through the addition of low-tech processes like: Sand filters Reactive filters Constructed Wetlands Composting toilets Or through replacement with a high-tech aerated treatment system

  45. Decentralised Onsite Management Level 1 Full owner awareness and responsibility Level 2 Owner has private maintenance contract Level 3 Owner has operating permit and required maintenance contract Level 4 Utility operates and maintains, ownership still with landowner Level 5 Utility owns and maintains

  46. Combined systems Combined systems are those where treatment occurs through a combination of onsite and offsite treatment processes Primary treatment is provided onsite by a septic tank and secondary treatment and effluent management is provided offsite at a centralised location

  47. Any questions?

  48. Centralised Collection systems Gravity collection systems: Conventional gravity system Modified gravity system Common effluent drainage

  49. Centralised Collection systems Pressure collection systems: Grinder Pump Septic tank effluent pump

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