Development services scheme pipelines 1.8.2.1
Prior to detailed design, a preliminary pipe size and alignment will be nominated by the Development Services Scheme (DSS).
Generally this will form the basis of the reimbursement, however during the detailed design process more accurate information may become available which could lead to a change in the initial assumptions.
For example, changes to natural and finished surface levels will alter the grade of the scheme pipeline. Any deviations from the scheme alignment due to the subdivisional layout or upsizing of pipe size due to internal connections from the developer's subdivision are at the developer's expense.
In determining the reimbursement, consideration must be given to factors such as existing services, depths to existing pits and pipes, grades, and any specific council requirements, only identified in detail once the consultant undertakes detailed survey of the site and prepares design plans.
Note: sometimes this may differ to the scheme information, due to contour intervals and differences between the preliminary designs undertaken in the Scheme and the detailed design undertaken by the consultant.
Pipeline alignment
If the works have been realigned to suit the subdivisional layout then the developer is to bear the costs of any increase in length of the pipeline.
For example, in Figure 1 below, the scheme pipeline between PA1-K8 needs to be built as part of the subdivision. The first section (K8-PA1A) was constructed along the alignment shown in dark blue but reimbursed for the length shown in purple. When the following stage of works (PA1A-PA1) was constructed the reimbursement for this section was calculated using the remaining section of scheme pipeline length shown in purple.
Figure 1 : Sample scheme layout showing difference in pipe alignments between the scheme requirements and the as constructed.
Pipeline size
The scheme will only reimburse for the pipe size required to convey the flows from the external catchment upstream of the development through to the nominated outfall point (node). The upsizing of any pipes to cater for additional flows from the subdivision will be at the developer’s cost.
The following processes are followed:
- The computed design flow entering the subdivision must be checked. This will normally be the Q5 but some councils may require this to be higher for their pipelines, particularly in industrial/commercial developments.
- The average grade of the scheme pipeline is determined by dividing the difference between the upstream and downstream inverts of the proposed pipeline by the scheme pipeline length. Any services or sub-surface obstructions that are not directly related to the new development should be taken into account.
- The reimbursable pipe size can then be determined using pipe charts. The following roughness values should be used: k=1.5mm for MW pipes and k=0.6mm for Council pipes.
Pipelines can't be upsized to cater for higher than the normal standard flows in order to comply with v x d safety criteria for overland flows. In some schemes, allowance has been made for this increase in pipe size but in most, it hasn't. If this isn't identified in the Works Offer, clarification should be sought from our relevant officer.
Rubber ring jointed vs interlocking joint pipes
Melbourne Water’s standards specify that Interlocking Joint (IJ or flush jointed) pipes are used unless the pipeline is expected to be pressurised (under head). If the pipeline is to be transferred to Council and the Council’s standards specify the use of Rubber Ring Jointed (RRJ) pipes, then reimbursement for these pipes will occur.
If the tenders do not include IJ rates for the required pipe size then alternative methods for determining an appropriate IJ rate are required. This could include interpolation between the given IJ rates for other pipe sizes in the tender or applying the factor between RRJ rates and IJ rates in the Standard Refund tables (Reference) in the Land Development Manual (LDM).
Example 1: Interpolation
| Pipe size | 900mm diameter IJ | 1050mm diameter IJ | 1350mm diameter IJ |
|---|---|---|---|
| Tender | $435/metre | ??? | $910/metre |
Calculation: ($910-$435)/(1350-900)X(1050-900)+$435=$593/m
Example 2 : Factoring
| Pipe size | 900mm diameter IJ | 900mm diameter RRJ |
|---|---|---|
| Tender | $435/metre | ??? |
| SRR | $454/metre | $611/metre |
Calculation: ($611/$454)X$435=$585/m
Splays
When the change of the pipeline alignment coincides with a change in the scheme alignment then splays may be reimbursed if the pipe size hasn't been greatly oversized for subdivisional flows. Otherwise, the developer is to bear the cost of the splays. Generally changes in alignment for smaller diameter pipelines (less than 1050 millimetre diameter) can be managed using a junction pit. If the consultant demonstrates via computations the head loss through the pit is too severe, then reimbursement for splays on smaller pipelines may occur.
Fine crushed rock backfill
There's an allowance for 20% Fine Crushed Rock (FCR) backfill for pipelines in schemes unless a scheme has specifically identified the pipeline as requiring 100% FCR, for example under or along existing roads. Note that 20% is based on two 10 metre wide driveway/road crossings every 100 metres.
In most instances the scheme will only fund 20% FCR. In this situation, viewing the longitudinal section of the pipeline will determine whether the extent of FCR backfill is proportional to 20% or less. If so, the quantities as measured in the tender schedule will be adopted, taking into account the scheme alignment.
If the longitudinal section shows a greater volume of FCR backfill than what the scheme should be funding then the equivalent to 20% FCR based on the scheme length is calculated. The cost of the balance is then to be reimbursed at an ordinary backfill rate. If the tenders don't present an ordinary backfill rate then a factor will be applied based on one of the following two options:
- obtain a factor based on other pipe sizes within the tender where both ordinary backfill and FCR backfill rates are available
- use a factor derived from the standard refund rates using the 20% FCR and 100% FCR rates for that pipe size.
Note: for the method of determining a factor difference between earth backfill and FCR refer to 'Example 2: Factoring' above.
Pits and structures
The developer is to bear the cost of any pits and structures which only serve the subdivision. Oversized pits which cater for side entry pit arrangements and upsized pipelines are not reimbursable. We only reimburse for standard sized pits which will accommodate scheme-sized pipelines.
The following processes are followed:
- Junction pits are allowed for at scheme nodes, any change in scheme alignment, and any legitimate change in pipe size. In between these points, manholes are required for maintenance, generally at a spacing of Dx100, where D is the pipe diameter in metres. For example, a 900 millimetre diameter pipe will need a manhole (or junction pit) at least every 90 metres. Minimum spacing for maintenance is 50 metres. Maximum spacing for maintenance is 200 metres.
- One-off special pits are considered on a case by case basis taking into account their functionality within the scheme.
Connections
Reimbursement occurs for connections made to our existing pipelines and pits, but the connection of any internal subdivisional drainage line is at the developer's cost.
Pipelines not in a scheme 1.8.2.2
We're continuing our program of establishing new Development Services Schemes for all developing greenfield areas. Therefore the number of projects not covered by a scheme are becoming progressively rarer. There are still occasions when works are being designed and constructed under the Developer Works process that don't fall under a Scheme. These works will require the development of a strategy to ensure the ultimate drainage takes into consideration the full catchment.
In these instances, the Works Offer will define which elements of the project will be reimbursed. Unless otherwise stated, the developer should bear the cost of any additional length of pipeline, upsizing of the pipeline and additional pits and structures included to suit the subdivision only.
Wetlands not within retarding basins 1.8.2.3
Excavation
The developer is to bear the cost of excavation beyond which is required to deliver a functioning wetland, for example ornamental ponds or enlarged deep water areas within the wetland. The volume of excavation required to achieve the desired outcomes of the wetland should be referred to in the functional design report.
The developer is also to fund any additional earthwork associated with sediment ponds located at the outlets from the local drainage system. These works will most likely not be itemised separately in the tender. An estimation of the volume of each local sediment pond will be made and subtracted from the total earthwork volume in the tender.
Arrangements in place with the developer regarding Storm Water Quality contributions may affect whether there is to be a reimbursement of local sediment ponds.
Excavation above the Normal Water Level (NWL) to provide the Extended Detention Depth (EDD) is reimbursable.
Rockwork
All of the rockwork required to achieve the outcomes of the wetland and keep the asset in a sustainable condition is to be reimbursed. The developer is to bear the cost of any rockwork (or concrete structure) that's required to stabilise outlets from the local drainage system or provide an aesthetic feature such as a retaining wall or landscape rock above the active wetland.
The following processes are followed:
- Identify and exclude any items in the tender relating only to outlets from the local subdivision
- Include rockwork required to assist in the future maintenance of the asset, (access track)
- If the tender has combined all rockwork items into one lump sum then an estimate by volume needs to be made
Planting
All aquatic and ephemeral plants required for the water treatment process are reimbursable items. We'll also reimburse for edge planting (to a reasonable width, two to five metres).
If we're responsible for the surrounding open space (within our reserve), then there'll be reimbursement for the cost of grassing the land or coverage of low lying shrubs if it's to reduce future maintenance costs. Consideration will also be given to reimbursing for some trees (at 50 metre spacing, if it's desirable) but anything more elaborate is to be at the developer's cost, for example garden beds or a larger number of trees.
If the surrounding open space is owned by council, then the developer will be responsible for grassing or planting this area.
The following processes are followed:
- The number (density) of terrestrial plants to provide a basic coverage is determined
- Installation and operation of irrigation systems won't be reimbursed. These may be wanted during the establishment and maintenance period but we won't reimburse for their cost or accept these for on-going maintenance
- Reimbursement is for tube stock and hikocells only, as these have a greater success rate over more mature plants. The developer may wish to use more mature plants to give a more immediate aesthetic value to the estate however this cost will be borne by the developer.
Some tenders will include items relating to maintenance during the establishment (12 weeks) and the defects liability period (104 weeks), for example watering, weeding, bird netting and rabbit proofing. We'll reimburse these items however payment should be deferred until the end of the defects liability period.
Costs associated with replanting of dead plants won't be reimbursed. While it's acknowledged there'll always be some plants that fail to establish, contractors need to factor this risk into their tender rates where they're in competition with other tenderers.
Wetlands within retarding basins 1.8.2.4
The reimbursement for wetlands within retarding basins will be calculated using the method described for wetlands not within retarding basins, but will take into consideration the following.
Excavation
We'll reimburse for the excavation required to provide the necessary volume as detailed in the design report for the retarding basin and wetland including any air space above the Normal Water Level (NWL) of the wetland (refer to Figure 2). The developer is to bear the cost of any dead storage (volume of water below the NWL) which may be created in the construction of any ornamental ponds, sediment ponds only treating the outlets from the local drainage system or deep pools within the wetland.
Note: the excavation of any air space above these items contributing to the capacity of the retarding basin is reimbursable.
The following processes are followed:
- In the event these works aren't itemised separately in the tender, an estimation of the volume of each of the items listed above needs to be made and subtracted from the total earthwork volume in the tender
- When estimating volumes of excavation the calculations must be based on the volume below natural surface and not the volume of the storage capacity, (below Top Water Level (TWL)
Reimbursable components:
- embankment
- outlet structure
- grassing of embankment
- spillway
- ANCOLD/risk assessment
Components not reimbursable:
- road construction on embankment
- increased height of embankment due to road
- temporary RB
Example:
A large cell immediately upstream is a 5,000cu.m open water body (below NWL) to be used by the community as passive recreation. The remaining cells operate as water treatment facility. Total excavation of the asset is 75,000cu.m. Therefore the reimbursable volume of excavation is 70,000cu.m.
Figure 2: Diagram depicting the differences between natural surface, top water level, extended detention depth and normal water level.
Planting
Wetland aquatic and ephemeral planting is reimbursed as per wetlands not within retarding basins, however for the open space containing the retarding basin, we'll pay for grassing of the base and the embankment and a basic coverage of trees and shrubs (not on the embankment) if it's desirable and doesn't compromise the functionality of the retarding basin.
If Council is to maintain the open space incorporating the retarding basin and its supporting additional planting (not compromising the functionality of the retarding basin), then the additional planting is to be at the developer's (or council's) expense.
Standalone retarding basins 1.8.2.5
As per 1.8.2.4 Wetlands within retarding basins, the developer is to bear the cost of any dead storage created in the construction of any ornamental ponds.
Waterways 1.8.2.6
The basis for the reimbursement of a waterway will be outlined in the Works Offer.
Rehabilitation of an existing waterway
The following processes are followed:
- Most works associated with rehabilitating a waterway are reimbursable. This includes costs borne out of other authorities requirements such as retention of habitat and heritage sites along the waterway corridor
- Any temporary works associated with the subdivision (sacrificial sediment ponds, rock weirs) aren't reimbursable
- Sediment ponds treating local flows in accordance with Clause 56.07 of the Victoria Planning Provisions aren't reimbursable
- Footpaths and boardwalks aren't reimbursable
- Unless identified specifically in the scheme, we won't reimburse for any crossings of the waterway
Construction of a new waterway
The process is similar to rehabilitating an existing waterway, but with the following exceptions:
- the cost of any additional length of waterway designed to suit the subdivision layout be at the developer's cost
- we don't reimburse for waterway crossings, however, when calculating the reimbursement for a new waterway excavation, consideration will be given to reimbursement for an equivalent length of waterway in lieu of the crossing
- aesthetic landscaping in addition to the core riparian zone isn't reimbursable
- consideration should be given for paying for minimal terrestrial planting such as trees at 50 metre intervals
- Council maintained waterways are fully reimbursable with the exception of aesthetic garden beds, paths, park furniture
- although planting costs are significantly higher than grassing, to reduce future maintenance costs, we'll reimburse for dense vegetation (four to six plants per square metre)
Construction of a floodway channel
By definition this is a trapezoidal waterway with infrequent inundation such as a high flow bypass channel.
Please note:
- we'll typically reimburse for grass coverage, but may pay for denser vegetation if we're to maintain the asset in the future
- if the developer or Council requires a more elaborate level of landscaping this isn't to be reimbursed by us
- only the scheme alignment is reimbursable. Any deviation not required for the scheme's purposes is at the developer's cost. Items which may compromise this decision and will require further consideration are areas of environmental significance, unavoidable physical constraints, and heritage preservation
- unless identified specifically in the scheme, we won't reimburse for any crossings of the floodway
- crossings (bridge and culvert), footpaths and boardwalks are generally all at the developer's cost, however we may contribute towards the cost of paths which form part of the maintenance access to the asset
- when calculating the reimbursement for the new floodway, we'll give consideration to reimbursement for an equivalent excavated length of floodway in lieu of the crossing
- we should reimburse the full cost for a safe and maintainable floodway (generally with 1:5 batters). Exceptions to this include the situation where the floodway is serving less than 60 hectares and will be maintained by a council, generally resulting in a flatter batter
- vertical retaining walls are generally an ornamental or aesthetic feature and would be at the developer's cost. However, by constructing the retaining wall there's sometimes a significant saving in excavation or filling costs to us. In this circumstance reimbursement may be appropriate. There needs to be an estimation made of the savings in excavation to us for approval.
Raingardens 1.8.2.7
Providing the raingarden is identified in the scheme it should be fully reimbursable. If serving a catchment less than 60 hectares we would also reimburse the costs of ensuring it meets council's standards.
Provisional and contingency items 1.8.2.8
Some tenders interchange these terms but they have specific definitions and purposes which shouldn't be confused.
Provisional items
Provisional items may be required but the precise quantity won't be known until it's carried out and measured. In these instances tenderers should be quoting a rate only.
Alternatively, it could be an item which may or may not be required, but if it is the quantity will be known. In these instances tenderers may quote a rate and a quantity.
Simple rule:
- provisional items are 'known-unknowns' or 'unknown-knowns'
Contingency items
Contingency items are simply to cover additional costs unforeseen at the time of tendering. They can be a lump sum amount or a percentage of the construction cost.
Simple rule:
- contingency items are 'unknown-unknowns'
The following process is followed:
- Neither provisional items nor contingency items are to be included in the initial reimbursement assessment
- Provisional items need to be considered for reimbursement along with the rest of the tendered items once it's quantified and substantiated
- Allowance is to be made in the approved budget for both provisional and contingency items
- Any items arising which weren't identified in the original tender and are considered to be contingent items need to be assessed as a variation
Variations 1.8.2.9
Any variations arising during construction need to be assessed to determine if:
- the contractor/consultant should've been aware of this item prior to construction. A decision on whether we reimburse the variation will be made on a case by case basis
- if the item is only required for the development, then it's not reimbursable
- if the cost is fair and reasonable then a comparison should be made with other rates already in the tender. Failing this a comparison could be made with tenders from other projects in a similar circumstance. Standard Refund Rates are available for common items, for example pipelines, earthworks, and rockwork. If no comparison is available then the onus should be put back on the contractor/consultant to substantiate the rate.
Site environmental management (provisional) 1.8.2.10
The consultant is required to itemise site environmental management costs separately from other items in the tender. This is to avoid the site environmental management being combined with other provisional items, (site establishment, traffic management)
Note: this item should encompass the complete site management aspect of the project from the creation of the Site Environmental Management Plan (SEMP) to the implementation, monitoring and maintenance throughout the project.
The consultant must also be encouraged to properly vet any tenders coming in to ensure the cost of the site environmental management items submitted by the contractors are reasonable. Large fluctuations in the amount need to be followed up with the contractor to get an understanding of techniques the contractor is proposing.
Although the reimbursement is usually based on the lowest overall tender, consideration must be given to the above as a low site environmental management cost may be signalling a potential failure on site of their environmental controls, which in fact leads to larger variations and an inferior asset.
By leaving this item as provisional in the reimbursement calculation, it then makes the consultant and contractor responsible for delivering on the SEMP. This will give us the opportunity to make deductions when any aspect of the SEMP is not followed through or are breached.
Note: this gives some flexibility if additional costs are required to alter the SEMP due to unforseen site conditions. If there's insufficient scrutiny of the contractors' SEMP by the consultant and the EPA becomes involved due to onsite problems, we shouldn't wear any additional costs.
Engineering and council supervision 1.8.2.11
Engineering fee scale
This fee is calculated by us. It shouldn't be applied to other survey/investigation items such as geotechnical, flora & fauna reports.
The scale has been accepted by Industry as an appropriate measure of the engineering input into a project. There may be times however where a project can be of higher complexity and a higher engineering fee may be justified. We'll negotiate with the consultant/developer on a case-by-case basis (refer to engineering fees).
Council supervision fee (2.5%)
This only applies to pipeline projects where the Works Offer has identified the works to be supervised by council. The fee is accepted by Industry and is automatically calculated by us.
Note: this is reimbursed to the developer not to Council.
Non-competitive tenders 1.8.2.12
In some instances it may not be possible to obtain three tenders for a project. This usually occurs when a developer has already engaged a contractor to undertake all works on site so tendering of our works wouldn't be legitimate. In addition, constructed works may bear no resemblance to the theoretical scheme works we'll be basing reimbursement upon, (pipe vs waterway).
Single tender
Standard Refund Rates are used to calculate an alternative cost against the tender. The reimbursement will be the lower of the two values.
Alternatively the consultant may be able to locate tenders for a similar project in the geographical area which will allow for a comparison of rates.
Change of scope
In some instances although three tenders may have been received, late scope changes may have resulted in items being constructed not in the original tenders. For pipes and pits the preferred option for determining a fair and reasonable rate would be interpolating between rates in the tender. For example, a rate for a 1350 millimetre diameter pipe may be estimated using given tendered rates for 1200 millimetre and 1500 millimetre diameter pipes. Obviously this won't always be possible and alternative methods of estimating a rate will be considered.
Special structures added after design was tendered
There are two options:
- We identify a similar structure in a nearby project where rates are available and use these to verify the cost. If the rates are within 10 per cent of the quoted price then it'll be deemed competitive
- An alternative and more complex method which is to break the structure down into a dollar per cubic metre rate, i.e. the volume of the structure walls, floor, top and riser. By doing this with a structure where the cost is already competitive then there'll be two comparative rates.
CCTV
When CCTV is required it's not unusual for there to be a single rate as it's a specialised field. An estimate rate which can be used as a comparison is $6 per lineal metre. This doesn't take into account any flushing or dewatering of the pipe to undertake the CCTV inspection. Judgement is used to assess if the price is fair and reasonable for smaller amounts, (less than $5,000 or 1% of the total value of the project). For more expensive costs we seek a peer review.
Application of Standard Refund Rates
We maintain Standard Refund Rates (SRR) for pipelines and earthworks. These are generally used by us for estimating the cost of works in the establishment of the schemes. However these rates can be used to assist in the calculation of reimbursements should competitive tender rates not be available for the project.
Pipeline SRR have a loading of a minimum of 20% FCR backfill to cater for driveways and two roadways every 100 metres. The pipeline SRR also include standard pits and structures, and an allowance for crossing or removing minor services.
Therefore if we substitute SRR in an existing tender to complete the list of reimbursable items, then any additional fine crushed rock, structures or services occurring along this length of pipe will be deducted.
If SRR are used to generate a total construction cost for comparison against one or two comparative tenders, no additional items will be added to this calculation unless there's an extraordinary case for it, (a large or complex pit structure) that's significantly larger than a standard structure.
Soft engineering works are covered in the SRR. However some items such as Health and Safety, environmental management are built into the SRR for earthworks.
Table of reimbursable items in tenders 1.8.2.13
| Item | Description | Reimburse | Justification | Comments |
|---|---|---|---|---|
| 1 | Site establishment | |||
| 1.1 | Site establishment, maintenance of site, vacation of site construction of haul road | Yes | All projects require site preparation (provided it is only for MW required works) | Separated from subdivisional works |
| 1.2 | H&S | Yes | Commitment to safety of contractors, MW staff | Separated from subdivisional works |
| 1.3 | Insurance - professional indemnity | No | Not project specific costs - should be included in project overheads | |
| 1.4 | Insurance - public liability | No | Not project specific costs - should be included in project overheads | |
| 1.5 | Permit to work including training in accordance with our requirements | No | Not project specific costs - should be included in project overheads | |
| 1.6 | Permit - confined space in accordance with our requirements | No | Not project specific costs - should be included in project overheads | |
| 1.7 | Site preparation including removal and disposal of small trees, shrubs, rubbish, structures, fences, rock, rubble, building rubbish, edge strip and no road sign, unsuitable material and protection of designated flora | Yes | All projects require site preparation (provided it's only for our required works) | |
| 1.8 | Contractor to prove all critical existing services prior to commencing construction | Yes | Provide certainty for project budget by eliminating variations | |
| 2 | Site and traffic management plan | |||
| 2.1 | Traffic management | ? | For control of traffic on roads external to the subdivision (solely due to our works - predominately existing roads) | Separated from subdivisional works |
| 2.2 | Road signage | ? | See 2.1 Traffic management | Separated from subdivisional works |
| 3 | Survey | |||
| 3.1 | Survey set out | Yes | Required to establish accuracy of our works | |
| 3.2 | Interim survey during construction | Yes | Required to establish accuracy of our works | |
| 4 | Environmental management plan | |||
| 4.1 | Preparation of environmental management plan | No | Reimbursed under engineering fees | |
| 4.2 | Implementation and maintenance of environmental controls | Yes | To protect the downstream environment | Feedback from surveillance officer (photos) |
| 4.3 | Temporary stormwater diversion system during construction works | Yes | Necessary and cost effective way to complete works in dry conditions | If pumping is required due to site constraints, necessity for pumping is to be demonstrated |
| 4.4 | Management of upstream flows during construction | Yes | Allow for all works necessary during construction period to enable works to be undertaken in a safe, environmentally friendly manner | Quality assurance documents must be available in the event of an audit |
| 5 | Quality assurance administration | |||
| 5.1 | Quality assurance administration and maintenance of records | Yes | This is what the contractor is doing toward the Quality Assurance process (this includes keeping of deliver records, certifying materials etc.) not covered by the engineering fees | Quality Assurance documents must be available in the event of an audit |
| 6 | Pipelines | |||
| 6.1 | Complete including excavation, supply of nominated pipes, laying, bedding, jointing and backfill, as detailed excluding surface finish (pavement/topsoil/grass) | Yes | Required in scheme therefore funded | |
| 6.2 | Balance pipes and agricultural drains | Yes | All pipes associated with hydraulic performance of wetlands and bio retention systems | |
| 6.3 | Topsoiling and grassing of disturbed area over scheme pipe | Yes | Part of reinstatement | |
| 6.4 | Internal subdivision pipe connections including pits that are scheme nodes | Yes | Required in scheme therefore funded | Compare against current scheme plan |
| 6.5 | Culverts under existing roads accommodating Q5 levels including rockwork and concrete apron (100yr culverts only reimbursable if state in Works offer reimbursement section) | Yes | Residentially we reimburse Q5 underground flow, industrial/commercial Q10-Q20 council dependent | Works offer |
| 6.6 | Culverts under existing roads accommodating 100yr flows including rockwork and concrete apron (unless stated in Works offer reimbursement section) | No | Residentially we reimburse Q5 underground flow, industrial/commercial Q10-Q20 council dependent | |
| 6.7 | Culverts under roads accommodating 100yr flows and identified in the scheme (from local PSP) | Yes | Required by scheme and adopted by us and road authority in PSP | |
| 6.8 | Culverts under new subdivisional roads including rockwork and concrete apron | No | Meeting subdivisional needs only, not scheme required. We'll consider reimbursing for the equivalent waterway length in lieu of culvert. | |
| 6.9 | 100 per cent crushed rock (existing road) | ? | Roads identified at time planning scheme, not those created afterward | Compare against current scheme plan |
| 6.10 | Splay pipes | ? | If scheme shows change of alignment and this change can't be accommodated by use of pit | Consider hydraulic calculations from consultant for head loss |
| 6.11 | Pipe stub | ? | Yes if it's to form part of scheme pipeline, otherwise no | Compare against current scheme plan |
| 6.12 | Lot drain (house drain) connection within road easement to pipe or pit, or upsizing scheme pit to accommodate | No | Not required in scheme therefore not funded | |
| 6.13 | Internal subdivision pipes | No | Not required in scheme therefore not funded | |
| 7 | Structures | |||
| 7.1 | Complete including excavation, internal and external formwork, reinforcement, supply and placement of concrete, step irons, backfilling and surplus soil disposed offsite | Yes | Required in scheme therefore funded (subject to other item 7 conditions) | |
| 7.2 | Pit types and spacing | Yes | Junction pit at a scheme node, man hole at all other where it meets 100xD spacing | |
| 7.3 | Side entry pit | ? | Typically reimbursed as an equivalent junction pit | |
| 7.4 | Pipe sizing | Yes | Reimburse as per scheme or council requirement | |
| 7.5 | Twin function pit | Yes | Necessary for operation of wetland | |
| 7.6 | Special structures | ? | Reimbursable provided it's performing a necessary function under the scheme, i.e. not for subdivisional purposes only | |
| 7.7 | RB outlet structure | Yes | Necessary for operation of RB | |
| 7.8 | Culvert guardrails | ? | Residentially we reimburse Q5 underground flow, industrial/commercial Q10-Q20 council dependent. If reimbursing for the culvert, we reimburse for the guardrail. | |
| 7.9 | Internal subdivision pipe connections including pits that are not scheme nodes. | No | Not required in scheme therefore not reimbursable | |
| 7.10 | Construction and cleanout of any sumps at end of existing pipes | No | Not part of the ultimate works, more enforcement u/s may be required | |
| 7.11 | Construct and remove temp end walls / make good connection / sump at property boundary | No | Temporary works not required in scheme therefore not funded under scheme | |
| 7.12 | Retaining walls | ? | There may be an argument by constructing the retaining wall there's a significant saving in excavation or filling costs to us. In this circumstance reimbursement may be appropriated | Consultant to demonstrate savings of excavation via computations |
| 7.13 | Supply and install safety barrier | ? | Required for our outlets and vertical drops associated with a our asset | Separated from subdivisional works |
| 8 | Earthworks | |||
| 8.1 | Stripping and stockpiling of topsoil | Yes | For future reinstatement of disturbed area | |
| 8.2 | Filling including compaction and trimming to shape | ? | Not for subdivision, only embankments etc. | Separated from subdivisional works |
| 9 | Wetlands | |||
| 9.1 | Excavation below the normal water level | Yes | Essential for providing the necessary volume for water quality treatment | |
| 9.2 | Ornamental ponds/lakes | No | Takes no part in the water quality treatment process | |
| 9.3 | Volume above NWL for EDD | Yes | Required for the 72 hour detention time | |
| 9.4 | Volume between EDD and natural surface (NS) | Yes | Excavation required to achieve invert | |
| 9.5 | Rockwork | Yes | All rockwork associated with performance of wetland. Doesn't include rock beaching at subdivisional outlets | |
| 9.6 | Placement of topsoil | Yes | For all areas within the reserve, essential for plant establishment | |
| 10 | Retarding basins | |||
| 10.1 | Excavation | Yes | Essential for providing the necessary storage volume for the RB | |
| 10.2 | Embankment (including grassing) | Yes | Critical part of the functioning RB | |
| 10.3 | Road construction on embankment | No | Responsibility of the relevant road authority | |
| 10.4 | Increased height of embankment due to road (not required for the RB storage) | No | Responsibility of the relevant road authority | A calculation needs to be made of the reimbursable portion of the embankment |
| 10.5 | Spillway | Yes | Critical part of the functioning RB | |
| 10.6 | Placement of topsoil | Yes | For all areas within the reserve, essential for plant establishment | |
| 10.7 | Supervision and testing of all filling in accordance with ANCOLD requirements | Yes | Critical part of the functioning RB | Report submitted |
| 11 | Waterways | |||
| 11.1 | Excavation (existing) | Yes | Essential for providing the necessary waterway profile | |
| 11.2 | Excavation (new) | Yes | The cost of any additional length of waterway that's designed to better suit the subdivision needs to be determined and will be at the Developer's cost | |
| 11.3 | Rockwork | Yes | All rockwork associated with performance of waterway. Doesn't include rock beaching at subdivisional outlets | Separated from subdivisional works |
| 11.4 | Placement of topsoil | Yes | For all areas within the reserve, essential for plant establishment | |
| 12 | Raingardens | |||
| 12.1 | Excavation | Yes | Essential for providing the necessary treatment profile for the raingarden | |
| 12.2 | Rockwork | Yes | All rockwork associated with performance of the raingarden | Separated from subdivisional works |
| 12.3 | Placement of topsoil | Yes | For all areas within the reserve, essential for plant establishment | |
| 12.4 | Filter medium | Yes | Critical part of the functioning raingarden | |
| 13 | Sediment ponds | |||
| 13.1 | Excavation | Yes | Essential for providing the necessary storage volume for the sediment pond | |
| 13.2 | Clay liner | Yes | Critical part of the functioning sediment pond | |
| 13.3 | Rock placed on top of clay liner | Yes | Provides hard base for future maintenance activities | |
| 13.4 | Maintenance tracks | Yes | Essential for the future maintenance activities | |
| 14 | Planting
Tube stock and hikocell are acceptable as they have a greater success rate over more mature plants. The Developer may wish to use more mature plants to give a more immediate aesthetic value to the estate, however this cost will be borne by the Developer |
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| 14.1 | Aquatic | Yes | Critical part of the functioning wetland | |
| 14.2 | Ephemeral/edge | Yes | Critical part of the functioning wetland | |
| 14.3 | Terrestrial | Yes | Additional aesthetic landscaping isn't reimbursable. Consideration given for minimal terrestrial planting such as trees at 50 metre intervals. Although planting costs are significantly higher than grassing, to reduce future maintenance costs, we'll reimburse for dense vegetation (four to six plants per square metre) | |
| 14.4 | Grass | Yes | Floodway grass, waterway to reduce future maintenance costs, we will reimburse for dense vegetation (four to six plants per square metre) | |
| 14.5 | Irrigation systems | No | Planting should be timed to coincide with the appropriate seasons. During the maintenance period there may be a cost for continuing to water the plants, e.g. water trucks - ref 15.3 | |
| 14.6 | Erosion control matting | Yes | Essential in supressing weeds and supports plant establishment | |
| 14.7 | Mulch | ? | Reimbursed if helping with scheme required ground cover | Our reserve, above the Q100 level (plan of sub) |
| 14.8 | Net gain offset planting (inc monitoring) | ? | If the trees being removed obstruct our asset, but not if the trees are being removed from the subdivision | Arborist report |
| 15 | Asset recording | |||
| 15.1 | Asset recording (as-con survey and creation of plans/drawings) | No | Included in engineering fees | |
| 15.2 | CCTV inspection of all drainage lines (to be undertaken by the contractor to the satisfaction of Council's Works Supervisor) | Yes | If Council requires this to accept the asset then it's reimbursable. Note if council is supervising construction of the pipeline then this is reimbursable | Written Council request |
| 16 | Maintenance | |||
| 16.1 | Planting maintenance of the works during the establishment and defects liability period | Yes | Long term integrity of asset dependant on proper establishment | Feedback from surveillance officer in situations where maintenance frequency questioned (photos) |
| 16.2 | Weed management (prior & during construction) | Yes | Ensures clean site for successful vegetation establishment | Feedback from surveillance officer in situations where maintenance frequency questioned (photos) |
| 16.3 | Vegetation management (including watering) | Yes | Ensures successful vegetation establishment (including 13 week establishment period & 24 month maintenance period), watering, weeding, bird netting, rabbit proofing | Submission of contractors' invoices for watering prior to payment (provisional item) |
| 16.4 | Tree plastic sleeves & hardwood stakes | ? | If the trees are reimbursable then this should be paid as it'll improve establishment of vegetation and minimises vermin damage | |
| 16.5 | Replacement of plants during the defects period | No | Not project specific costs - should be included in project overheads | |
| 17 | Temporary works | |||
| 17.1 | Temporary fencing | ? | Only if surrounding our immediate works, or portion of total length if a some of our works make part of subdivisional stage fence perimeter. Not reimbursed if only for partial duration of construction period to allow Developer to secure premature SOC release | Require plans showing location of fence |
| 17.2 | Temporary fencing (required to achieve early SOC) | No | Subdivisional timing requirement | |
| 17.3 | Temporary fencing (required until planting is established) | Yes | Safety requirement | |
| 17.4 | Temporary open drain outfall - excavation costs | ? | Yes, if temporary works proven to be part of ultimate asset without excessive over excavation. No, if not proven to be part ultimate works and only to facilitate upstream development |
Preliminary plans of both the future asset and surrounding subdivision |
| 17.5 | Temporary RB | No | Subdivisional timing requirement | |
| 17.6 | Temporary access track | ? | Yes, if constructed solely for our asset creation | |
| 17.7 | Temporary open drain outfall | No | Temporary works only to facilitate upstream development | |
| 17.8 | Construct & remove temp end walls / make good connection / sump at property boundary | No | Temporary works not required in scheme. Therefore not funded under scheme | |
| 17.9 | Reset sediment pond back to design levels at end of defect period | No | We expect a clean 'fresh' asset commencement of our maintenance period | |
| 17.10 | Semi-mountable kerb and channel | ? | Yes, only if the road kerb and channel is existing (predating the development) and must be modified to accommodate our asset construction | |
| 17.11 | Construction and cleanout of any sumps at end of existing pipes | No | Not part of the ultimate works, more enforcement u/s may be required | |
| 17.12 | Excavation relating to local SWQ below RB storage i.e. dead storage | No | Not a scheme-required asset | |
| 18 | Miscellaneous | |||
| 18.1 | Site reinstatement | Yes | All works are to be in a similar condition to pre-commencement (do not reimburse for nature strip reinstatement or subdivisional reinstatement) | |
| 18.2 | Alteration to existing services, e.g. Telstra fibre optic, sewer rising main & water main | ? | Not if the need to alter services is shared equally or predominantly by Developer or other service authorities. Consider pro rata | Evidence that the relocation was the most economical option |
| 18.3 | On-costs on top of rates for work | ? | Yes, when forced to engage parties external to the construction contract e.g. rail contractors, gas service authorities. No, when the items are included in the original tender schedule |
Copies of relevant correspondence |
| 18.4 | Service/utility location/relocation | ? | Yes, if consultant has performed due diligence. No, if it largely relates to subdivision or if the asset is under Developer's control |
Copies of relevant correspondence |
| 18.5 | Retaining walls - waterways and wetlands etc. | ? | Savings can sometimes be made in reduced land acquisition and excavation/fill, etc. | Justification of design decision indicating MWC cost savings |
| 18.6 | Recirculation system (pump) - temporary works due to insufficient catchment | No | We may consider reimbursing this item if we've instigated the works | |
| 18.7 | Supervision and management (included on tender) - e.g. site foreman | No | Should be factored into job rates, as on its own it doesn't contribute to our asset | |
| 18.8 | Reinstatement of existing road/rail/services/driveway/footpaths/etc. | Yes | Reinstate to similar condition prior to works | |
| 18.9 | Pavement markings, signs & road furniture | No | Not project specific costs - should be included in project overheads | |
| 18.10 | Street lighting, concrete kerbing and channel | No | Not project specific cost - should be included in project overheads | |
| 18.11 | Footpaths | No | Community asset only | |
| 18.12 | Pedestrian crossings, viewing platforms, etc. | No | Community asset only | |
| 18.13 | Overheads | No | Should be factored into job rates, as on its own doesn't contribute to our asset | |
| 18.14 | Planting soil preparation | Yes | Soil preparation prior to plants being installed will ensure a higher quality of plants established. This is only applicable for our assets. Areas outside our requirements such as garden beds are Developer funded | |
| 18.15 | Pumping | ? | Site establishment (in lieu of a bypass system). During construction - wet weather event. Temporary outlet beyond construction | Consultant to provide analysis demonstrating that this is the most cost effective method of managing the flows |
| 19 | Variations | |||
| 19.1 | Variations with fair and reasonable rates (and associated engineering fees) | ? | Variations always require some degree of design/office input. Justification must be submitted prior to carrying out of work | Evidence of need, claim certificate from contractor |
| 19.2 | Negative variations that are fair brought about by our accepted reduction in scope of work (no reduction in engineering fees) | Yes | Engineering input similar or already completed, but with cost benefit to us | Feedback from surveillance officer and/or consultant |
| 19.3 | Negative variations without our accepted reduction in scope of work (apply reduction in engineering fees) | Yes | Engineering input reduced, or non-existent completed, no worthwhile cost benefit to us | Feedback from surveillance officer |
| 19.4 | Wet weather layoff and stand down time | No | We don't control any aspect of the timing of works | |