waste assets.
waste
assets.
sewer.
Asset Management
PLAN
sewer.
SEWER This Supporting Section should be read in conjunction with Council’s Asset Management Plan, the Asset Management Policy (which sets out Council’s philosophy of asset management) and Council’s Asset Management Strategy and Strategic Direction documents (which provides Council with a clear direction and goal for managing the community’s $1.168 billion (as at June 2012) worth of assets). These documents can be found at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/engineering-services/ asset-management-introduction/asset-management-plan. This is the second edition of the Sewer Supporting Section of the Asset Management Plan and is based on the most current data available as at October 2012.
1
Current Asset Base
The following table highlights the proportion of the sewer mains network in the Wagga Wagga Local Government Area (LGA) in each condition ranging from excellent to very poor as at June 2012 compared to 2010.
NB The proportions of the sewer pipe network have been extrapolated based on the results of CCTV inspections on the network, the age and type of the pipe and industry standards which predict the condition based on a list of contributing factors. Condition rating of assets under the ground is always difficult and costly. The confidence in this data is medium to low. The colours in the above table appear in the following map and indicate the condition of the sewer mains network in the Wagga Wagga LGA.
SEWER Sewer Mains Network Map as at October 2012
SEWER Sewer Pump Stations and Treatment Plant Map as at June 2012
SEWER Size of the Network Council owns and maintains approximately 622km of sewer pipe, 37 pump stations and 6 treatment plants conducting secondary and tertiary sewerage treatment. The value of the sewer network is estimated to be $306,227,749 (in 2012 dollars). In the Wagga Wagga urban area and the rural villages of Collingullie, Ladysmith and Uranquinty 23,610 properties are connected to the system, which collects approximately 5,202 ML of sewage each year
Challenges of the Network The challenges facing the sewer network include: • the need to ensure the effluent reuse schemes fully comply with the requirements of the Australian Guidelines for Water Recycling 2006 • minimising greenhouse gas emissions • maximising effluent reuse and development alternative schemes • the size of the sewage treatment plant in Forest Hill may not meet the demand when new areas are developed • the need to provide safe, reliable and cost effective services to unserviced rural villages • increasing energy costs • the management of the non-sequential development on the fringe of the Wagga Wagga urban area and • the management of the high biological and chemical load from liquid trade waste There are also a number of challenges facing the business of sewer management, including: • potential impacts of on-going drought and climate change on revenue and assets • ageing infrastructure • proposed and potential changes to the businesses as a result of the review of water utilities in NSW • complying with legislation • failures of onsite wastewater treatment systems in the rural villages and • the retention and attraction of skilled employees
SEWER 2
Condition Assessment
Condition Rating Reference Sheet The condition of the sewer pipe network is audited against a rating scale which ranges from excellent to very poor. The rating scale is from the Water Service Association of Australia’s Conduit Inspection Rating Code. This scale is used as the basis for all assessments of the sewer pipe network and forms the Condition Rating Reference Sheet below. The images provide visual examples of the scale from the Code.
SEWER Risk and Condition Rating Indicators Council also uses Risk and Condition Rating Indicators to determine a prioritised works schedule for the maintenance, renewal and replacement of large asset categories. These indicators are used in addition to the Condition Ratings Reference Sheet to enable further analysis of the worst sections of the asset class. The Indicators are used to develop an overall Works Schedule Priority Rating for each individual asset or section of an asset. The first stage considers the risk that the condition of the asset poses to the community. The following table details the Risk Rating Indicators for the sewer pipe network.
The second stage of the process considers the Condition Rating Indicators. The age of the pipe is considered for the sewer network. The older the sewer pipe (or the closer the pipe is to the end of its design life), the high the risk of failure due to internal and external pressure, cracking, root penetration and/or chemical corrosion. Each section of sewer pipe is rated against the Condition Rating Indicator detailed in the below table.
SEWER The results of the Risk and Condition Rating Indicators analysis are combined to give an individual asset or section of the asset a Works Schedule Priority Rating. For example a section of sewer could be rated as follows:
The Work Schedule Priority Ratings for sections of sewer infrastructure are then ranked from highest to lowest to produce prioritised schedule of works for maintenance, replacement and renewal of the network.
Condition Inspection Regime The condition of the sewer pipe network is inspected using CCTV technology and is assessed against the Condition Rating Reference Sheet and the Water Services Association of Australia’s Conduit Inspection Reporting Code. Scheduled condition inspections are conducted every 10 years and focus on identified black spot areas. In 2008 inspections were conducted in the areas of high customer complaints and sections of the network which are concrete and earthenware pipe. In addition, unscheduled condition inspections are conducted in response to blockages in the network.
Unscheduled Inspection Regime Ad hoc inspections will be conducted in response to customer requests, on a needs basis and where the asset degrades due to un-foreseen or unusual circumstances, like a storm event. These inspections are done onsite by trained Surveillance Officers and the results are captured in Council’s electronic mapping system (ArcGIS). Risks associated with the sewer network are indentified on an ad hoc basis by Council staff who attend to the network and the community members who report issues, through Council’s Customer Request System. More information regarding Council’s risk management practices can be found in the Asset Management Plan, at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/ engineering-services/asset-management-introduction/asset-management-plan.
SEWER 3
Life Cycle Management
Life cycle management details how Council plans to manage and operate the asset category at the agreed level of service while minimising life cycle costs throughout the useful life of the asset. For most local government assets there are four key phases to the life cycle, namely: acquisition, operation and maintenance, renewal, and disposal. Further information about life cycle management and the processes used by Council to manage each stage of the life cycle can be found in the Asset Management Plan at http:// www.wagga.nsw.gov.au/city-of-wagga-wagga/engineering-services/asset-managementintroduction/asset-management-plan .
Acquisition The expansion of the sewer network is in response to development and customer expectations. Council’s Strategic Business Plan: Sewerage Services includes a 30 Year Capital Works Program for the expansion of the sewer network. When the sewer network expands details are recorded in Council’s asset management system and the new asset is included in the appropriate inspection regimes.
Estimated Useful Life The lifespan of sewer pipe depends on the material used. The following table details the useful life of the various sewer pipes.
* uPVC – Unplasticised Polyvinyl Chloride * HDPE – High Density Polyethylene
SEWER Maintenance Target Maintenance Events The sewer network, operates on a cost recovery basis. The maintenance of the network is not financed by Council’s General Purpose Reserve, but from the income of the network, the Sewer Reserve. For this reason, maintenance events of the network are not included in this Asset Management Plan. However, this information will be considered in future revisions of the Plan as Council moves towards strategic asset management.
Unscheduled Maintenance To guide Council’s response to registered requests in Council’s Customer Request System, reactive triggers (based on the level of risk) have been developed for each asset category. These triggers include intervention activities and target response times. Whilst Council aims to achieve these target response times, situations can arise that hamper Council’s efforts and response times may be extended for reasons including, but not limited to resource availability, excessive workloads and emergency events which impact the network. The following table details the reactive triggers, intervention and target response times for unscheduled maintenance of the sewer network.
SEWER Renewal A detailed works program for the renewal of the sewer network is developed annually to support this Asset Management Plan. This renewal program is prioritised based on the results of the condition audits. The renewal plan is developed by Council’s Asset Integrity Section based on the data in Council’s asset management system. The renewal plan is recommended to the Business Owner of the sewer network, who decides the works to be implemented. The implementation of the works program depends on the level of funding available in Council’s budget, as detailed in the Long Term Financial Plan or grant funding received. The renewal of some sewer network assets, pumps for example could be in the form of a complete replacement or the replacement of a component of the pump. This level of detail is captured during the condition audits of the network and included in the works program. Once a sewer network asset is renewed the data is captured in Council’s asset management system.
Disposal Currently, Council includes the cost to dispose of an asset in the unit rate of that asset type. As Council moves towards strategic asset management this cost will be captured separately. The Asset Management Plan will be updated to reflect this change as it occurs across the asset types.
SEWER 4
Level of Service
The level of service for each asset category defines what Council intends to deliver to the community with respect to its assets and the level of service the community can afford. The level of service for each asset category is being developed in the coming years and will be based on community expectations, legislative requirements and internal Council policy. When developed, the level of service for each asset category will focus on how the community experiences the asset (relating to factors such as condition, quality, reliability, responsiveness, sustainability, timeliness, accessibility, cost and functionality) and technical characteristics required to deliver the asset. There is a direct relationship between the level of service provided by an asset and the cost to provide it. As the level of service becomes higher, the cost to provide it also increases. As Council moves towards strategic asset management, Council will consider these two factors in relation to each asset category and for the infrastructure network as a whole. In 2012 the level of service for each asset category is based on the satisfactory condition of the asset, coupled with Council’s target response times and actions for unscheduled maintenance activities as contained in this Asset Management Plan section. For more details about the level of service for asset categories please see the Asset Management Plan at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/ engineering-services/asset-management-introduction/asset-management-plan.
SEWER Satisfactory Condition In Council’s first Asset Management Plan of 2011 the satisfactory condition for the sewer network was set at average. The following graph details the proportion of the sewer network in each condition. The graph is based on condition data from the asset management system as at 2010/11 and 2012/13.
The proportions in the above graph have been extrapolated for the entire sewer pipe network, based on the CCTV results captured to date. The above graph indicates that between 2010/11 and 2012/13 the proportion of the network in excellent condition has increased by 1%, the percentage of the network in good condition has decreased by 5%, while the proportion in average condition has decreased by 1%. During the same period the percent of the network in poor condition has increased by 5% and the proportion of the network in very poor condition has decreased by 1%. Therefore, as the level of service for the sewer pipe network is average, the percent of the network not meeting the level of service has increased from 3% to 7% since 2010.
SEWER 5
Financial Considerations
Current Liability Council’s current liability in relation to the infrastructure network is the sum of all asset units which have a condition rating of less than average and therefore deemed unsatisfactory. The current liability of the sewer network is estimated to be $9,948,569 (in 2012 dollars) down from $51,812,452 in 2010. The significant reduction in the current liability is a result of increases to the relining of sewer pipes program and the completion of the Sewer 2010 project which saw the upgrade of Narrung and Kooringal sewage treatment plants. The following table details the replacement costs of the assets in poor and very poor condition:
Projected Annual Maintenance Costs The sewer network is not financed by Council’s General Purpose Reserve, but from the income of the network, the Sewer Reserve. For this reason, projected maintenance costs of the network are not included in this Asset Management Plan. However, this information will be developed and included in future revisions of this Plan.
SEWER 6
Assumptions
There are some generic assumptions made in the management of assets in Wagga Wagga City Council these are found in the Asset Management Plan at http://www. wagga.nsw.gov.au/city-of-wagga-wagga/engineering-services/asset-managementintroduction/asset-management-plan. In addition, the following assumption has been made in relation to the sewer network: • The extrapolated costings for the sewer network in this Asset Management Plan are based on the following: o
NSW Reference Rates for a STW 200 EP
o
Victoria Local Government Adjustment Rates and
o
Sewer 2010 contract
• The extrapolated costings also consider the age, type and diameter of the sewer pipe. • The estimated useful life of the sewer pipes included in this Plan are based on the NSW Reference Rates for STW 200 EP.
stormwater & flood mitigation network.
Asset Management
PLAN
stormwater & flood mitigation network.
STORMWATER AND FLOOD MITIGATION NETWORK This Supporting Section should be read in conjunction with Council’s Asset Management Plan, the Asset Management Policy (which sets out Council’s philosophy of asset management) and Council’s Asset Management Strategy and Strategic Direction documents (which provides Council with a clear direction and goal for managing the community’s $1.168 billion (as at June 2012) worth of assets). These documents can be found at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/engineering-services/ asset-management-introduction/asset-management-plan. This is the second edition of the Stormwater and Flood Mitigation Supporting Section of the Asset Management Plan and is based on the most current data available as at September 2012.
1
Current Asset Base
Size of the Network The stormwater and flood mitigation network managed by Council in the Wagga Wagga LGA comprises of 19.53km of levee banks, 10.6km of detention basin banks, 52.2km of open drains and 371km of stormwater pipes. The value of the levee network is estimated to be $19,531,812 (in 2012 dollars). The value of the stormwater network is estimated to be $127,504,280 (in 2012 dollars).
Levee Banks The following table highlights the proportion of the levee network in the Wagga Wagga Local Government Area (LGA) in each condition ranging from excellent to very poor as at June 2012 compared to June 2010.
The colours in the above table appear in the following map and indicate the condition of each asset in the levee network in the Wagga Wagga LGA.
STORMWATER AND FLOOD MITIGATION NETWORK Levee Network Map as at June 2012
STORMWATER AND FLOOD MITIGATION NETWORK Stormwater Management System The following table highlights the proportion of the stormwater management pipe system in the Wagga Wagga Local Government Area (LGA) in each condition ranging from excellent to very poor as at June 2012 compared to June 2010.
STORMWATER AND FLOOD MITIGATION NETWORK Stormwater System Map as at June 2012
STORMWATER AND FLOOD MITIGATION NETWORK Challenges of the Network Some challenges facing the stormwater and flood mitigation network include: • The condition of the below ground stormwater infrastructure is largely unknown. • There are many areas of the City where the stormwater infrastructure, above and below ground, cannot contain the storm levels they were originally designed for because their hydraulic catchments have been extended without any upsizing of infrastructure lower in the catchment. This means that stormwater in these areas follow the natural overland flow path, usually through low lying properties. • Wollundry Lagoon and Tony Ireland Park receive much of the stormwater from the Central and South Wagga areas. The Wollundry Lagoon in particular is in need of desilting to free up air space which will accommodate increased stormwater volumes. • The top water level of the Wollundry Lagoon was raised by Council in the 1990’s to assist with the cooling of the Civic Centre. This has resulted in the level of the lagoon being above the discharge level for quite a few stormwater pipes which means that many of these pipes store water, significantly reducing the effectiveness of these systems. • Gross pollution systems in many of the detention basin in the City either do not exist or are in need of upgrading (particularly Bolton Park). This means that gross pollutants are not captured and cleanups are required after moderate to large storm events. • Council has a number of open drains, large diameter pipes and discharge points that can be accessed by the community during storm events which could result in serious injury or possible drowning. • Sediment and gross pollution control of stormwater must be assessed for environmental impact. The quality of stormwater discharged can be improved with engineering techniques. • Wagga Wagga is highly susceptible to urban salinity. Design efficient stormwater systems that do not exacerbate groundwater infiltration is an engineering challenge, particularly in some areas of the City were development is occurring. • The existing Main City Levee does not provide a level of protection against a modelled 1 in 100 year riverine flood event. The structural integrity of the levee has been audited, which shows the levee in some areas does not meet the engineering compaction standards. • The existing North Wagga Levee currently does not provide protection against a modelled 1 in 20 year riverine flood event. The structural integrity of this levee has been audited and shown that the levee in some areas does not meet the engineering compaction standards. • Council does not conduct community education for its stormwater system. • Council does not currently have a sufficient budget allocation to adequately maintain its ageing stormwater network.
STORMWATER AND FLOOD MITIGATION NETWORK 2
Condition Assessment
Condition Rating Reference Sheet The condition of the stormwater infrastructure network is audited against a rating scale which ranges from excellent to very poor. This scale is used as the basis of all assessments of the stormwater infrastructure by Council’s Surveillance Team. The rating scale forms the Condition Rating Reference Sheets below. Condition Rating Reference Sheet - Stormwater Pipes
STORMWATER AND FLOOD MITIGATION NETWORK Condition Rating Reference Sheet - Levee Banks
STORMWATER AND FLOOD MITIGATION NETWORK Risk and Condition Rating Indicators Council also uses Risk and Condition Rating Indicators to determine a prioritised works schedule for the maintenance, renewal and replacement of large asset categories. These indicators are used in addition to the Condition Ratings Reference Sheet to enable further analysis of the worst sections of the asset class. Risk and Condition Rating Indicators have been developed for the stormwater pipe network. The Indicators are used to develop an overall Works Schedule Priority Rating for each individual asset or section of an asset. The first stage considers the risk the condition of the asset poses to the community. The following table details the Risk Rating Indicators for the stormwater network.
The second stage of the process considers the age of the pipe. This is the Condition Rating Indicator.
STORMWATER AND FLOOD MITIGATION NETWORK The older the stormwater pipe (or the closer the pipe is to the end of its design life), the higher the risk of failure due to internal and external pressure, cracking, root penetration and/or chemical corrosion. Each section of stormwater pipe is rated against the Condition Rating Indicators detailed in the below table.
The results of both these stages of the matrix process are combined to give an individual asset or section of the asset a Works Schedule Priority Rating. For example a section of stormwater infrastructure could be rated as follows:
The Work Schedule Priority Ratings for stormwater infrastructure are then ranked from highest to lowest to produce a prioritised schedule of works for maintenance, replacement and renewal of the network.
STORMWATER AND FLOOD MITIGATION NETWORK Condition Inspection Regime The condition of the stormwater network will be assessed as part of the Condition Inspection Regime. This inspection will audit the condition of each section of stormwater and flood mitigation infrastructure asset against the Condition Rating Reference Sheets. It is proposed the inspection regime should address the pipe material most at risk of failure, for example clay, then by age of the pipe. Obviously the older the pipe, the closer it is to the end of its design life. Pipes closer to the end of their design life need to be inspected more frequently. A new pipe or one less than 10-15 years old may only need to be inspected once during that time. The levee will be audited every 3 months and after each significant rain event.
Unscheduled Inspection Regime Ad hoc inspections will be conducted in response to customer requests, on an as needs basis and where the asset degrades due to un-foreseen or unusual circumstances, like a storm event. These inspections are done onsite by trained surveillance officers and the results are captured in Council’s electronic mapping system (ArcGIS). Risks associated with the stormwater and flood mitigation network are indentified on an ad hoc basis by Council staff and community members, through Council’s Customer Request System. The information gathered in the annual condition inspection of each asset in the network provides Council with sufficient information to develop works schedules. More information regarding Council’s risk management practices can be found in the Asset Management Plan, at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/ engineering-services/asset-management-introduction/asset-management-plan .
STORMWATER AND FLOOD MITIGATION NETWORK 3
Life Cycle Management
Life cycle management details how Council plans to manage and operate the asset category at the agreed level of service while minimising life cycle costs throughout the useful life of the asset. For most local government assets there are four key phases to the life cycle, namely: acquisition, operation and maintenance, renewal, and disposal. Further information about life cycle management and the processes used by Council to manage each stage of the life cycle can be found in the Asset Management Plan at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/engineering-services/assetmanagement-introduction/asset-management-plan .
Acquisition The acquisition of stormwater pipes mainly occurs in new development areas where the system is expanded. When a stormwater or flood mitigation asset is built details are recorded in Council’s asset management system and the new asset is included in the appropriate inspection regimes.
Maintenance Target Maintenance Events The following tables detail the target maintenance events associated with the stormwater and flood mitigation network annually.
STORMWATER AND FLOOD MITIGATION NETWORK
The following table details the target maintenance events associated with the salinity network annually.
Unscheduled Maintenance To guide Council’s response to registered requests in Council’s Customer Request System, reactive triggers (based on the level of risk) have been developed for each asset category. These triggers include intervention activities and target response times. Whilst Council aims to achieve these target response times, situations can arise that hamper Council’s efforts and response times may be extended for reasons including, but not limited to resource availability, excessive workloads and emergency events which impact the network.
STORMWATER AND FLOOD MITIGATION NETWORK The following table details the reactive triggers, intervention and target response times for unscheduled maintenance of the stormwater network.
Renewal A detailed works program for the renewal of the stormwater network is developed annually to support this Asset Management Plan. This renewal program is prioritised based on the results of the condition audits. The renewal plan is developed by Council’s Asset Integrity Section based on the data in Council’s asset management system. The renewal plan is recommended to the Business Owner of the stormwater network, who decides the works to be implemented. The implementation of the works program depends on the level of funding available in Council’s budget, as detailed in the Long Term Financial Plan or grant funding received. Once a section of levee or stormwater pipe is renewed the data is captured in Council’s asset management system.
Disposal Currently, Council includes the cost to dispose of an asset in the unit rate of that asset type. As Council moves towards strategic asset management this cost will be captured separately. The Asset Management Plan will be updated to reflect this change as it occurs across the asset types.
STORMWATER AND FLOOD MITIGATION NETWORK
4
Level of Service
The level of service for each asset category defines what Council intends to deliver to the community with respect to its assets and the level of service the community can afford. The level of service for each asset category is being developed in the coming years and will be based on community expectations, legislative requirements and internal Council policy. When developed, the level of service for each asset category will focus on how the community experiences the asset (relating to factors such as condition, quality, reliability, responsiveness, sustainability, timeliness, accessibility, cost and functionality) and technical characteristics required to deliver the asset. There is a direct relationship between the level of service provided by an asset and the cost to provide it. As the level of service becomes higher, the cost to provide it also increases. As Council moves towards strategic asset management, Council will consider these two factors in relation to each asset category and for the infrastructure network as a whole. In 2012 the level of service for each asset category is based on the satisfactory condition of the asset, coupled with Council’s target response times and actions for unscheduled maintenance activities as contained in this Asset Management Plan section. For more details about the level of service for asset categories please see the Asset Management Plan at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/ engineering-services/asset-management-introduction/asset-management-plan.
STORMWATER AND FLOOD MITIGATION NETWORK Satisfactory Condition Stormwater Pipe Network In Council’s first Asset Management Plan of 2011 the satisfactory condition for the stormwater pipe network was set at average. The following graph details the proportion of the stormwater pipe network in each condition. The graph is based on condition data from the asset management system as at 2009/10 and 2012/13.
As indicated on the above graph the overall condition of the stormwater pipe network has remained constant since 2009/10. As the level of service for this asset category is average, the percent of the network not meeting the level of service is 3% in 2012, unchanged from 2010.
STORMWATER AND FLOOD MITIGATION NETWORK Levee Network In Council’s first Asset Management Plan of 2011 the satisfactory condition for the levee network was set at good. The following graph details the proportion of the levee in each condition. The graph is based on condition data from the asset management system as at 2009/10 and 2012/13.
As indicated on the above graph the overall condition of the levee has improved since 2010 with the proportion in excellent condition increasing by 2.9% and the percent rated as good increasing by 6% during the period. The proportion in average condition has decreased from 81.2% to 74.6% and there has been a 2.2% decrease in the proportion of the network in poor condition. The percent of the levee in very poor condition has remained constant at 0% since 2010. As the level of service for the levee is good condition, the percent of the network not meeting the level of service in 2012 is 91.1%. This has decreased from 100% in 2010.
STORMWATER AND FLOOD MITIGATION NETWORK 5
Financial Considerations
Current Liability Council’s current liability in relation to the levee network is the sum of all asset units (segments of the levee) which have a condition rating of less than good and therefore deemed as unsatisfactory. This current liability business rule is unique to the levee as its failure will have significant consequences to approximately 8,000 residents and commercial businesses, including possible loss of life. In addition, if the levee fails this failure puts enormous pressure on other parts of the levee resulting in further failures. The current liability of the levee is $17.9 million (in 2012 dollars), down from $19.9 million in 2010. The following table provides the details of the levee network current liability in 2010 and 2012.
NB The above table indicates an increase in the kilometres of the levee not meeting the level of service and yet a reduction in the estimated current liability. This is a result of Council’s continuous commitment to the improvement in data, including the costs to return the levee to a satisfactory condition. Council’s current liability in relation to the stormwater pipe network is the sum of all asset units which have a condition rating of poor and very poor. The current liability of the stormwater network is estimated to be $8,441,793 (in 2012 dollars), which remains constant since 2010.
STORMWATER AND FLOOD MITIGATION NETWORK The following table provide details of the stormwater pipe network current liability.
• RCP - Reinforced Concrete Pipe • uPVC – Unplasticised Polyvinyl Chloride • FRC - Fibre Re-enforced Concrete
Projected Annual Maintenance Costs For Council to achieve the target maintenance events as detailed in Section 3 of this Asset Management Plan, the projected annual maintenance budget for the stormwater and flood mitigation networks is estimated to be $1,819,920 (in 2010 dollars). This estimate was developed by Council’s Asset Management Planning and Program Integration Teams in 2010. It is a first principle estimate and is expected to vary as Council improves its asset management process and strategies.
STORMWATER AND FLOOD MITIGATION NETWORK The following table provides further details of the maintenance costs associated with maintaining the stormwater and flood mitigation network each year:
STORMWATER AND FLOOD MITIGATION NETWORK Required Increase to Annual Maintenance Budget per Additional Unit As the asset base increases it is important to ensure that the annual maintenance budget also increases. The following table details how much per unit the annual maintenance budget for the stormwater and flood mitigation network should increase as it expands (in 2010 dollars).
6
Assumptions
There are some generic assumptions made in the management of assets in Wagga Wagga City Council these are found in the Asset Management Plan at http://www. wagga.nsw.gov.au/city-of-wagga-wagga/engineering-services/asset-managementintroduction/asset-management-plan. In addition, the following assumption has been made in relation to the stormwater and flood mitigation network: • Currently the open drains, flood gates and pumps, which are all part of the stormwater network are not condition rated and as a result are not included in the current liability. As Council continues to improve its asset management this will be completed.
waste management facilities.
Asset Management
PLAN
waste management facilities.
WASTE MANAGEMENT FACILITIES This Supporting Section should be read in conjunction with Council’s Asset Management Plan, the Asset Management Policy (which sets out Council’s philosophy of asset management) and Council’s Asset Management Strategy and Strategic Direction documents (which provides Council with a clear direction and goal for managing the community’s $1.168 billion (as at June 2012) worth of assets). These documents can be found at http://www.wagga.nsw.gov.au/cityof-wagga-wagga/engineering-services/asset-management-introduction/assetmanagement-plan. This is the second edition of the Waste Management Facilities Supporting Section of the Asset Management Plan and is based on the most current data available as at June 2012.
1
Current Asset Base
The following table highlights the proportion of the waste management facilities in the Wagga Wagga Local Government Area (LGA) in each condition ranging from excellent to very poor as at June 2012 compared to June 2010.
The colours in the above table appear in the following map and indicate the condition of each asset in the waste management facilities in the Wagga Wagga LGA.
WASTE MANAGEMENT FACILITIES Network Map as at June 2012
WASTE MANAGEMENT FACILITIES The following provides details of the Gregadoo Waste Management Centre.
WASTE MANAGEMENT FACILITIES Size of the Network The Gregadoo Waste Management Centre processes an average of between 75,000 and 80,000 tonnes of waste per year. The site has 2 weighbridges, 4 cells and the entire site area is 238 hectares. The rural villages of Collingullie, Currawarna, Humula, Galore, Mangoplah, Tarcutta and Uranquinty have smaller waste management sites.
The value is this infrastructure network is estimated to be $6,732,983 (in 2012 dollars).
Challenges of the Network Challenges facing waste management facilities include: • Resource recovery is a major challenge for waste management. • New cells are required as more waste enters landfill, these are expensive, not environmentally appropriate and approval from the State Government is difficult to achieve for this strategy. • Improving/increasing separation of waste prior to acceptance. • Greenhouse gas emissions, capture and safe disposal. • Increasing the participation rates for resource recovery. • The economic viability of the rural village waste management facilities. • Meeting the strict legislative requirements. • Education for resource recovery. • Remediation of waste management site at the end of their life.
WASTE MANAGEMENT FACILITIES 2
Condition Assessment
Condition Rating Reference Sheet The condition of waste management facilities is audited against a rating scale which ranges from excellent to very poor. This scale is used as the basis of all assessments of waste management facilities by Council’s Surveillance Team. The rating scale forms the Condition Rating Reference Sheet below.
WASTE MANAGEMENT FACILITIES Condition Inspection Regime The condition of waste management facilities located across the Wagga Wagga LGA will be assessed as part of the Condition Inspection Regime. This inspection will audit the condition of each waste management facility against the Condition Rating Reference Sheet. Each waste management facility will be audited every year. The inspections will be in the form of a GPS audit routine.
Unscheduled Inspection Regime Ad hoc inspections will be conducted in response to customer requests, on a needs basis and where the asset degrades due to unforeseen or unusual circumstances, like a storm event. These inspections are done onsite by trained Surveillance Officers and the results are captured in Council’s Asset Management System. Risks associated with the waste management facilities are indentified on an ad hoc basis by Council staff who attend to the facilities and the community members who use them, through Council’s Customer Request System. More information regarding Council’s risk management practices can be found in the Asset Management Plan, at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/ engineering-services/asset-management-introduction/asset-management-plan.
WASTE MANAGEMENT FACILITIES 3
Life Cycle Management
Life cycle management details how Council plans to manage and operate the asset category at the agreed level of service while minimising life cycle costs throughout the useful life of the asset. For most local government assets there are four key phases to the life cycle, namely: acquisition, operation and maintenance, renewal, and disposal. Further information about life cycle management and the processes used by Council to manage each stage of the life cycle can be found in the Asset Management Plan at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/engineering-services/assetmanagement-introduction/asset-management-plan.
Maintenance Target Maintenance Events The landfill and transfer stations are commercial entities and operate on a cost recovery basis. The maintenance of the waste management facilities is not financed by Council’s General Purpose Reserve, but from the income of the stations, the Solid Waste Reserve. For this reason, maintenance events of the waste management facilities are not included in this Asset Management Plan. However, this information will be considered in future revisions of the Plan as Council moves towards strategic asset management. However the target maintenance events for the following asset categories are used as a guide for each type of asset at the waste management facilities: • Buildings • Fences • Footpaths • Stormwater and • Unsealed roads.
Unscheduled Maintenance To guide Council’s response to registered requests in Council’s Customer Request System, reactive triggers (based on the level of risk) have been developed for each asset category. These triggers include intervention activities and target response times. Whilst Council aims to achieve these target response times, situations can arise that hamper Council’s efforts and response times may be extended for reasons including, but not limited to resource availability, excessive workloads and emergency events which impact the network.
WASTE MANAGEMENT FACILITIES The following table details the reactive triggers, intervention and target response times for unscheduled maintenance of waste management facilities in the Wagga Wagga LGA.
Renewal A detailed works program for the renewal of the waste management facilities is developed annually to support this Asset Management Plan. This renewal program is prioritised based on the results of the condition audits. The renewal plan is developed by Council’s Asset Integrity Section based on the data in Council’s asset management system. The renewal plan is recommended to the Business Owner of the waste management facilities, who decides the works to be implemented. The works program is then communicated to the Project Management Section or the Program Integration Division to implement the works and the Finance Division for funding. The implementation of the works program depends on the level of funding available in Council’s budget, as detailed in the Long Term Financial Plan or grant funding received. Once a waste management facility is renewed the data is captured in Council’s asset management system.
Disposal Currently, Council includes the cost to dispose of an asset in the unit rate of that asset type. As Council moves towards strategic asset management this cost will be captured separately. The Asset Management Plan will be updated to reflect this change as it occurs across the asset types.
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Level of Service
The level of service for each asset category defines what Council intends to deliver to the community with respect to its assets and the level of service the community can afford. The level of service for each asset category is being developed in the coming years and will be based on community expectations, legislative requirements and internal Council policy. When developed, the level of service for each asset category will focus on how the community experiences the asset (relating to factors such as condition, quality, reliability, responsiveness, sustainability, timeliness, accessibility, cost and functionality) and technical characteristics required to deliver the asset. There is a direct relationship between the level of service provided by an asset and the cost to provide it. As the level of service becomes higher, the cost to provide it also increases. As Council moves towards strategic asset management, Council will consider these two factors in relation to each asset category and for the infrastructure network as a whole. In 2012 the level of service for each asset category is based on the satisfactory condition of the asset, coupled with Council’s target response times and actions for unscheduled maintenance activities as contained in this Asset Management Plan section. For more details about the level of service for asset categories please see the Asset Management Plan at http://www.wagga.nsw.gov.au/city-of-wagga-wagga/ engineering-services/asset-management-introduction/asset-management-plan.
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Financial Considerations
Current Liability There is no current liability associated with the waste management facilities in the Wagga Wagga LGA as all assets at these facilities have a condition rating of average or above.
Projected Annual Maintenance Costs The waste management facilities are not financed by Council’s General Purpose Reserve, but from the income of the facility, the Solid Waste Reserve. For this reason, projected maintenance costs of waste management facilities are not included in this Asset Management Plan. This information will be developed in future revisions of this Plan. However, the projected annual maintenance costs for the following asset categories are used as a guide for each type of asset at the waste management facilities: • Buildings • Fences • Footpaths • Stormwater and • Unsealed roads.
WASTE MANAGEMENT FACILITIES Required Increase to Annual Maintenance Budget per Additional Unit As the asset base increases it is important to ensure that the annual maintenance budget also increases. As the waste management facilities are not financed by Council’s General Purpose Reserve, the required increase to the annual maintenance budget for additional assets is not included in the Asset Management Plan. This information will be developed and included in future revisions of this Plan. However, the required increase to the annual maintenance budget per additional unit for the following asset categories is used as a guide for each type of asset at waste management facilities: • Buildings • Fences • Footpaths • Stormwater and • Unsealed roads.
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Assumptions
There are some generic assumptions made in the management of assets in Wagga Wagga City Council, these are found in the Asset Management Plan at http://www. wagga.nsw.gov.au/city-of-wagga-wagga/engineering-services/asset-managementintroduction/asset-management-plan. In addition, the following assumptions have been made in relation to the landfills and transfer stations: • The area (m2) of the waste management facilities defined in this plan, are total land area figures. They are not related to the capacity/volume of the sites for waste receipt. This information is expected to be included in future revisions of this Asset Management Plan.