3.12 Mary River (Yabba Creek): Borumba Dam Raising

3.12.1 General Borumba Dam is located on Yabba Creek at AMTD 31.1 km in the Mary River Catchment. It was originally constructed to a full supply level of 132.28m with a capacity of 33,400 ML and was raised in 1997 to a Full Supply level of 135.01 with a storage volume of about 46,000 ML. The proposed ultimate raising for Borumba Dam was that it be raised by up to 25m from the original full supply level to a level of 157.28 and to utilise additional yield from Coles Crossing Weir on the Mary River at AMTD 212.4 km. Yield analyses undertaken for this study included storage capacities up to 460,000 ML. However, higher levels of development up to 1,000,000 ML storage capacity have the potential to increase yield. A 1,000,000 ML storage would require construction of a dam to a level about 60m above the original full supply level.

Table 3.12.1 General Parameters of Borumba Dam Raise

Feature Description

Name of Project Borumba Dam

Other Names N/A

Catchment Mary River

Catchment area (km2) 4661

Stream Yabba Creek

Local Government Area Cooloola Shire

Location (AMTD) 31.1 km

Location (Latitude / Longitude) 26°30’24” S / 152°34’55” E (Map Grid of Australia (MGA), Zone 56. Datum = GDA94)

Location (Easting / Northing) 7068133 / 0458352 (Map Grid of Australia (MGA), Zone 56. Datum = GDA94)

Dam Types Considered Concrete Faced Rockfill

Current Full Supply Level 135.01 m

Current Capacity 46,000 ML

1 Sourced from Department of Natural Resources, Survey Group, Engineering Services Drawing A3-202668, dated 12/7/96 – “Yabba Creek – Basin 138 – Borumba Dam – AMTD 31.1 km – Storage Data”.

41/14840/334064 Section 3.12 532 Borumba Dam Stage 3 Raise

Feature Description

Notes Borumba Dam Stage 3 has been assumed to act in conjunction with Coles Crossing Weir (not yet constructed)

Coles Crossing Weir Crest Height EL 60m

Coles Crossing Weir Capacity 3897 ML

3.12.2 Storage Capacity The storage capacity curves for Borumba Dam are as shown in Figure 3.12.1 and Figure 3.12.2. These figures are based on information contained within Department of Natural Resources, Survey Group, Engineering Services Drawing A3-202668, dated 12/7/96 – “Yabba Creek – Basin 138 – Borumba Dam – AMTD 31.1 km – Storage Data”, which in turn was based on Photogrammetric Digital Terrain Model (DTM) produced in 1996 from 1995 photography and combined with 1992 photogrammetric DTM from 1952 photography below EL 126.7m, survey records F25882.83 and F25813. This curve was supplied by NRM&W January 2006.

The data used for FSL’s above EL170m was extrapolated using the incremental increase from storage data shown in Department of Primary Industries, Water Resources Drawing A3-100600 dated 8/4/93, “Yabba Creek – Basin 138 – Borumba Dam – AMTD 31.1 km – Storage Data”, which in turn was based on Photogrammetric Survey Plan K1 – 100603 Field BK 24833.

41/14840/334064 Section 3.12 533 Borumba Dam Stage 3 Raise

Figure 3.12.1 Borumba Dam: Storage Capacity Curve

Borumba Dam - Storage Capacity Curve

220

200

180

160

140

Water Level (m) 120

100

80 0 200,000 400,000 600,000 800,000 1,000,000 1,200,000 1,400,000 Storage Volume (ML)

Figure 3.12.2 Borumba Dam: Storage Area Curve

Borumba Dam - Storage Area Curve

220

200

180

160

140

Water Level (m) Level Water 120

100

80 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 Storage Area (ha)

41/14840/334064 Section 3.12 534 Borumba Dam Stage 3 Raise

3.12.3 Potential Additional Supply Incremental historical no-failure yield estimates were completed for this study by NRM&W in February 2006 and are indicated in Table 3.12.2 and Figure 3.12.3. For the purposes of these estimates, the capacity of Coles Crossing Weir has been assumed as 3,897 ML. An April 2000 report by State Water Projects, Department of Natural Resources (Reference 24) suggests this as an upper limit if afflux at bank-full flow is limited to around 300mm.

The yield estimates do not include consideration of environmental flow requirements.

Table 3.12.2 Borumba Dam Raising: Estimated Storage Characteristics

Case Description Full Supply Storage Surface Incremental Level Capacity area HNFY Yield2 EL (m) (ML) (Ha) (ML/a)

Existing Base Case 135.01 46,000 479 03

Addition of Coles Crossing weir 135.0 46,000 479 7,500

Addition of Coles Crossing weir + Borumba Dam raising to FSL 158.0 158.0 260,000 1,455 23,500

Addition of Coles Crossing weir + Borumba Dam raising to FSL 169.6 169.6 460,000 2,007 38,000

Notes

1. Existing Full Supply Level

2. These yields are preliminary estimates prepared by NR&M of the additional historical no-failure system yield that could be extracted from a weir at Coles Crossing, and do not include consideration of environmental flow requirements. The yields are quoted as incremental above the base case (existing Borumba Dam).

3. The yield of the existing Borumba Dam (prior to consideration of environmental flow requirements) is comprised of 21,800 ML/a of high priority water and 10,200 ML/a of medium priority water.

41/14840/334064 Section 3.12 535 Borumba Dam Stage 3 Raise

Figure 3.12.3 Borumba Dam: Yield / Storage Relationship

Borumba Dam: Yield / Storage Relationship

40,000

35,000

30,000 Existing Borumba Dam 25,000

20,000

15,000 Yield (ML/a)Yield

10,000

5,000 Incremental Historical No Incremental Failure

0 0 100,000 200,000 300,000 400,000 500,000 600,000 Borumba Dam Storage Volume (ML)

3.12.4 Geology and Geotechnical Borumba Dam embankment is situated on Late Devonian-carboniferous Amamoor Beds overlain by Quaternary-aged flood plain alluvium (The Geological Survey of Queensland (SEQ Geoscience data set, 2003)). A deposit of Permian-Triassic-aged hornblende-biotite granodiorite occurs north west of the embankment.

The Quaternary-aged flood plain alluvium consisting of clay, silt, sand, and gravel is confined to the flow path of Borumba creek. The Amamoor Beds consist of mudstone, slate, basic metavolcanics, chert, schist, jasper, greywacke and are part of the Gympie Group. The Gympie Group is thought to have been formed in a deep oceanic, partly pelagic, depositional environment (R.W Day et al 1983). Folding and metamorphism has occurred through the region with two northwest trending faults occurring west of the embankment and one northeast trending fault located to the east.

41/14840/334064 Section 3.12 536 Borumba Dam Stage 3 Raise

3.12.5 Natural Environment

3.12.5.1 Vegetation The increased area of the storage would inundate an area of disturbed forest, (Reference 13).

A review of environment and vegetation mapping suggests that a small pocket of an endangered ecosystem is potentially affected on the southern fringe of the dam within the buffer storage area for the development of the dam to EL 157m.

3.12.5.2 Wildlife The area around Borumba dam is not known for any particular attributes.A review of the R.A.T.S2. database in 1994, indicated 8 fauna species, 3 mammals, 2 birds, 2 reptiles and 1 frog within the area of Yabba Creek that are either rare or threatened, (Reference 3).

3.12.5.3 River Riverine species include the Mary River Cod (currently listed as endangered) and the Platypus (protected). While the existing dam already acts as a barrier to fish and has modified the riverine habitat within the creek, further modification may have some impact, especially downstream of the dam wall, (Reference 3).

The current ponded storage area of Borumba Dam is used for a local fish hatchery. Obviously, some impact on this activity would occur during construction, (Reference 3).

3.12.5.4 RAMSAR Listing The Mary River flows into the Great Sandy Strait, which is listed on RAMSAR and subsequently triggers the EPBC3. RAMSAR is “an intergovernmental treaty that provides the framework for national action and international cooperation for the conservation and wise use of wetlands and their resources” (http://ramsar.org/index.html). “The Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act) protects the environment, particularly matters of National Environmental Significance. It streamlines national environmental assessment and approvals process, protects Australian biodiversity and integrates management of important natural and cultural places. The EPBC Act came into force on 17 July 2000.” (http://www.deh.gov.au/epbc/)

The impact of this Act on the project is not understood at this time, although Federal Government approval would be required.

2 Rare and Threatened Species Database. 3 EPBC = Environment Protection and Biodiversity Conservation Act, 1999.

41/14840/334064 Section 3.12 537 Borumba Dam Stage 3 Raise

3.12.5.5 Wild Rivers Act The Queensland Government passed the Wild Rivers Act in 2005 to preserve the natural values of wild rivers, through regulation of future development activities within the declared wild river and its catchment areas. A wild river is defined as a river system that has all, or almost all, of its natural values intact. That is, the river system is virtually untouched and in almost pristine condition.

The Mary River has not been nominated for inclusion in the Wild Rivers Act; and although public submissions for nominations may be received at any time, the Mary River, due to the presence of the Mary River Barrage, may not be a candidate for such a submission.

The policy currently being developed as a result of the Act specifically prohibits the future development of new dams and weirs in the river or main tributaries of a wild river. This may have implications for any dam or weir project on the Mary River and its tributaries if the Mary River is nominated as a wild river.

3.12.6 Social and Recreation The damsite is a popular recreational area with a campsite immediately downstream of the dam wall and boating facilities on the right bank of the ponded area. Obviously some interruption to these facilities would occur during the construction of a raise as well as affecting existing facilities at the current full supply level, (Reference 5).

All privately owned property required to raise the dam wall to provide a FSL of EL157.5m has been acquired by NRM&W.

The Borumba Pumped Storage project was previously considered by the Queensland Electricity Commission in the 1990’s for the purpose of hydroelectric power and included the proposed raising of Borumba Dam. It is understood that this project has since been abandoned.

3.12.7 Cultural / Heritage A review of relevant heritage databases as listed in Section 2 of this document indicates that there are no heritage-listed sites affected by this proposal.

No archaeologically significant sites have been identified however, there has been no thorough survey (Reference 5).

3.12.8 Strategic Land Use Planning Little current land use planning information was available at the time of writing, however, the area affected by the proposed dam raising was listed as Special Use, Rural A, Public Open Space in 1994, (Reference 5). Two parcels of land, part of which would be inundated, or affected by the buffer zone, are zoned ‘Forest Reserve’. These parcels are Yabba Forest Reserve (467AP63380), Imbil State Forest (135PTY1638 and 467APB6338) and Yabba State Forest (986PTY1720).

41/14840/334064 Section 3.12 538 Borumba Dam Stage 3 Raise

Forest Reserves are managed under the Nature Conservation Act, 1992. The purpose of a Forest Reserve is an interim tenure to assist with the dedication of that land as a National Park or some other form of protected tenure.

State Forests are managed under the Forestry Act, 1959. The purpose of a State Forest Reserve is the permanent reservation of such areas for the purpose of producing timber and associated products in perpetuity and of protecting a watershed therein. The impact of these on the proposed development is not fully understood at this time.

3.12.8.1 SEQ Regional Plan A search of the SEQ Regional Plan mapping indicates that the area for the proposed for the Borumba Dam raising is generally outside the study area, however, the south- eastern section of headwaters coincide with the edge of the plan, which is categorised “Regional Landscape and Rural Production Area”.

The SEQ Infrastructure Plan indicates that no new major infrastructure or major upgrades to infrastructure is planned for this site.

3.12.9 Forestry Plantation forestry exists on the south eastern shore of the dam. The forestry land affected by the raising the dam is primarily limited to the buffer zone and is therefore not likely to be of significance.

3.12.10 Conservation Land use mapping indicates that conservation areas exist both north and south of the existing ponded area and to some extent, would be affected by the proposed raising. However, the actual impact of the raising on these conservation areas is not known.

3.12.11 Extractive Industry There are no current mining activities although gold, slate and granite have been extracted in the past, (Reference 4).

3.12.12 Agriculture At the headwater of the dam, agricultural activities are grazing of natural vegetation. No other agricultural activity is affected by the proposed development, (Reference 13).

3.12.13 Primary Limitation on Storage Capacity There appears to be no topographic limitations on the dam up to about EL 320. At this level a number of saddles occur with the lowest being in the upper reaches of Borumba Creek. The engineering issues associated with the existing outlet and the potential economics of raising the existing dam by up to 60m suggest that for full supply levels

41/14840/334064 Section 3.12 539 Borumba Dam Stage 3 Raise

greater than about EL157, a new RCC dam constructed downstream of the existing dam may be the least cost option.

3.12.14 Project Capital Cost The project capital cost includes: 1. Dam construction cost; 2. Construction of Coles Crossing Weir; 3. Land purchase costs; 4. Relocation of electricity distribution lines; 5. Relocation of telecommunication lines; and, 6. Relocation of shire facilities. Cost estimates for items 1 to 6 above have been included in the costs to date and are indicated below. An estimate of raw water distribution costs was not undertaken at this time since delivery points and supply volumes had not as yet been determined. The estimates do not take into consideration the cost of financing during construction or operational costs.

3.12.14.1 Estimated Cost of Dam Construction Quantities for the FSL 142.3 and 157.5 concrete faced rockfill dams were determined in 1992 and were obtained from the work files (Reference 13). To assess the potential cost of constructing dams to the upper limit of storage capacity assessed in this study, RCC dam costs were also derived assuming that a new dam would be constructed downstream of the existing dam between the two ridges immediately adjacent and above the existing Fish Hatchery. Cost estimates of RCC dam options were undertaken for full supply levels of EL157.5m, 170.49m and 192.14m. Yield estimates for these development levels were obtained by interpolating the available data in Table 3.12.2, with the exception of FSL 192.14, for which extrapolation of the yield estimates would not provide reliable results. The EL157.5m level was considered for the purpose of providing an estimate of the cost differential between the RCC option and raising the existing dam to the same level. Spillway widths and configurations were also as per cost estimates contained in DPI work files (Reference 13). The least cost spillway crest length for concrete faced rockfill options was 38m for a FSL of 142.3m and 70m for a FSL of 157.5m. A spillway width of 200m was assumed for RCC options.

For the purposes of these cost estimates, it has been assumed that materials for the construction of the dam embankment would be available. An amount equal to 3% of the total contract price for the work has been allowed to provide for implementation and management of environmental works. This includes provision for fish lifts, erosion control works etc. The comparative costs of the dams for these options are indicated in Figure 3.12.4.

41/14840/334064 Section 3.12 540 Borumba Dam Stage 3 Raise

Figure 3.12.4 Borumba Dam: Estimated Dam Cost/Yield Relationship

Borumba Dam Raise - Yield / Dam Cost Relationship $350,000,000

$300,000,000

$250,000,000 FSL170.49m

$200,000,000

$150,000,000 FSL 157.5m Dam ($) Dam

$100,000,000 FSL 142.3m Concrete Faced Rockfill Dam

Estimated Capital Cost of $50,000,000 RCC dam constructed Downstream of Existing Dam $0 - 10,000 20,000 30,000 40,000 50,000 Historical No Failure Yield (ML/a)

Note: Environmental flow requirements have not yet been taken into account in determination of the yields shown in this graph.

3.12.14.2 Estimated cost of Land Acquisitions All privately owned property required to raise the dam wall to a FSL of 157.5m has been acquired by NRM&W. Nevertheless, the value of the land is relevant in overall cost comparisons and estimates of the current market value of the land have been incorporated into the cost estimates.

The cost of land acquisition was assessed using typical land sale values in the area ($10,000 per ha). The development does not impact on existing housing.

It has been assumed that land would be acquired to the extent defined by a 200m buffer area surrounding the full supply level for each option, less the area of the existing full supply level. The area within this buffer zone was obtained from GIS4 datasets using contour information provided by NRM&W.

In some instances, it may be necessary to acquire whole properties. The portions of these properties outside the buffer zone would, to the extent practical, be resold. An allowance of 50% has been added to the land portion of the estimated cost in order to cover:

Legal fees, subdivision and transfer costs;

Re-establishment of access to properties isolated by the storage; and,

4 GIS = Geographical Information Systems

41/14840/334064 Section 3.12 541 Borumba Dam Stage 3 Raise

Retention of unsaleable portions of properties outside the flood margin area.

A compensatory package would need to be negotiated with EPA in respect of areas required of State Forest and Forest Reserve (as discussed in Section 3.12.8), though no allowance has been made in this estimate above the assumed cost per ha for the purchase of land required. The estimated costs of land acquisitions are summarised in Table 3.12.3.

Table 3.12.3 Summary of Land Acquisition Cost Estimate

Full Supply Area Estimate of 50% Allowance Total Acquisition Level Acquisitions Cost (ha) (including $M buildings) $M $M

142.0 1,039 10.4 5.2 15.6

157.0 2,096 21.0 10.5 31.5

170.5 3,242 32.5 16.2 48.7

192.1 4,947 49.5 24.8 74.3

3.12.14.3 Road relocation Access to Borumba Dam is currently via a sealed road from Imbil and includes six small bridge crossings of Yabba Creek. It is anticipated that in order to accommodate construction traffic for a raising of Borumba Dam, the bridges, which are currently timber structures, would require replacement.

Other minor access roads would require upgrading or relocation.

The estimated cost of road relocation and bridge and road upgrades is $3.0 million.

3.12.14.4 Telecommunications There was no allowance made for upgrade of telecommunication facilities, however, some minor costs may be incurred.

3.12.14.5 Electricity Distribution There was no allowance made for upgrade of electrical distribution facilities, however, some minor costs may be incurred.

3.12.14.6 Shire Facilities The development of Coles Crossing Weir is likely to affect Noosa Council’s pump station intake on the Mary River. This structure is located 1.5 km upstream from the proposed location of Coles Crossing Weir and is likely to be inundated to a level that

41/14840/334064 Section 3.12 542 Borumba Dam Stage 3 Raise

would require modification of the intake structure. Therefore, a cost of $0.5 million has been included in the estimate for all development levels in addition to local road upgrades as previously mentioned. Noosa Council has experienced some challenges with this intake in the past, and any relocation or rearrangement would need to carefully consider potential localised siltation of the intake.

3.12.14.7 Overall Estimate of Cost The estimated costs for raising the Full Supply Level to EL 142.3, EL 157.5, EL 170.5 and EL 192.1 are indicated in Table 3.12.4. As indicated above, two methods of raising have been assessed. For raising the full supply level up to EL157.5m, raising by extending the existing concrete faced rockfill dam has been adopted, whereas for raising the full supply level above this a new RCC dam constructed downstream of the existing dam has been assumed. The unit cost of water and the marginal cost of water for raising the Full Supply Level to EL142.3, EL 157.5, EL 170.5 and EL 192.1 are indicated in Table 3.12.3 and Figure 3.12.5.

The unit cost of water is calculated by dividing the Total project cost by the yield at the relevant full supply level. The unit cost of water therefore results in a comparative cost of various water supply options providing similar assumptions are made.

The marginal cost of water has been calculated by dividing the incremental Total cost between development levels by the increase in yield between the same development levels. This provides a comparative cost for providing additional water from the project for comparison with alternative water supply options.

The estimate does not include consideration of operational or distribution costs.

41/14840/334064 Section 3.12 543 Borumba Dam Stage 3 Raise

Table 3.12.4 Borumba Dam Raising: Estimated Cost Summary

Full Concrete Roller Least Coles Land Road and Electrical Telecom TOTAL Unit Cost Marginal Supply Faced Compacted Dam cost Crossing Acquisition Shire distribution Capital of Water cost of Level Rockfill Concrete Weir Facilities $M Cost Water Dam Cost Dam Cost $M $M $M ($/ML/a) $M $M $M ($/ML/a) $M $M

135.0 N/A 10.7 N/A 0.5 0.0 0.0 11.2 1,493

142.3 59.96 60.0 10.7 16.6 3.50 0.0 0.0 90.8 8,433

157.5 119.53 125.9 119.6 10.7 32.5 3.50 0.0 0.0 166.3 7,253 6,209

169.6 (1) 198.0 198.0 10.7 47.6 3.5 0.0 0.0 259.8 6,836 6,187

170.5 203.8 203.8 10.7 48.7 3.50 0.0 0.0 266.7 6,7972 5,6062

192.1 324.1 324.2 10.7 74.3 3.50 0.0 0.0 412.7 N/A N/A

N/A = Not applicable. The yield information for FSL 170.5 and 192.1 could not be reliably extrapolated from reported estimates by NRM&W, therefore, the unit capital cost of water and the marginal capital cost for this level are not reported.

Note:

1) Interpolated dam and land acquisition costs to obtain total capital costs, unit costs and marginal cost of water for FSL 169.6.

2) Extrapolated data.

41/14840/334064 Section 3.12 544 Borumba Dam Stage 3 Raise

Figure 3.12.5 Borumba Dam Raise: Estimated Dam Cost/Yield Relationship

Raising Borumba Dam: Project Capital Cost / Yield Comparison 9,000 6,230

8,000 6,225

6,220 7,000

6,215 6,000 6,210 5,000 Cost of adding Coles Crossing Weir Only 6,205 4,000 ($/ML/a) ($/ML/a) 6,200 3,000 6,195 Unit Cost of Water (left axis)

Unit Capital Cost of Water 2,000 6,190 Marginal Cost of Water Marginal Capital Cost of Water (right axis) 1,000 6,185

0 6,180 - 100,000 200,000 300,000 400,000 500,000 Borumba Dam Storage Volume (ML)

41/14840/334064 Section 3.12 545 Borumba Dam Stage 3 Raise

3.12.15 Investigations Proposed to Ensure the Viability of a Major Raising of Borumba Dam Although a review of some information is required, few factors with a potential to jeopardise the viability of raising Borumba Dam have been identified. For Full Supply levels greater than the previously proposed Stage III full supply level (157.5m) the following work would be required to be undertaken:

Comparative estimate of cost for concrete faced rock fill dam raising or construction of a new dam downstream of the existing dam. This would include review of the spillway and outlet arrangement for the higher full supply level at the existing dam and geotechnical investigations for a dam at the downstream alignment together with comparative cost estimates. A possible site exists downstream of the confluence of Yabba Creek and a creek from the north approximately 2 km downstream from the existing site;

Determination of an upper level of possible development giving consideration to environmental flow requirements;

Review of environmental factors that may be impacted by the water levels above the Stage II raising level;

Review of affected State Forest and Forest Reserves parcels, which are in the process of being, gazetted National Parks; and,

Assess the impact of the RAMSAR listing of the Great Sandy Strait on the viability of this project.

There appears to be potential for flood harvesting into Borumba Dam from the Mary River, however, the 2004 report “Water Supply study of the Upper Mary Valley – Security of Supply” (Reference 7) suggests that “water harvesting into Borumba Dam is not a particularly attractive option” as the cost per megalitre harvested was, at that point in time, considered to be relatively high. There may be some merit in investigating this option further.

3.12.16 Figures 3.12.6 to 3.12.18 Figure 3.12.6 Locality Plan

Figure 3.12.7 Dam Wall Location Figure 3.12.8 Satellite and Cadastral Plan

Figure 3.12.9 General Geological Plan

Figure 3.12.10 Seismic Plan Figure 3.12.11 Land Use Plan

Figure 3.12.12 Zoning and Strategic Plans (Not Available)

Figure 3.12.13 Environmental and Vegetation Plan

41/14840/334064 Section 3.12 546 Borumba Dam Stage 3 Raise

Figure 3.12.14 Agricultural Value Classification Plan Figure 3.12.15 Typical Concrete Faced Rockfill Dam General Arrangement

Figure 3.12.16 Typical Concrete Faced Rockfill Dam Cross Section

Figure 3.12.17 Typical Concrete Faced Rockfill Dam Spillway Long Section Figure 3.12.18 Typical Section of Outlet Works

41/14840/334064 Section 3.12 547 Borumba Dam Stage 3 Raise !

Dagun !

ek Cre oor am Am Coles Crossing Weir

NOOSA SHIRE Kandanga !

Mary River a d nga C a reek K

COOLOOLA SHIRE

Imbil !

ek abba re Y C

S kyring C re ek Brooloo !

Borumba Dam Yabba Creek (!

Gympie !

Caboolture ! MAROOCHY SHIRE

KILCOY SHIRBrEisbane !

Legend South East Queensland Regional Water Supply Strategy (! Potential Damsite Highway Major Road Borumba Dam Raising Proposed Weir ² Yabba Creek AMTD 31.1km Local Government Area 0 1,000 2,000 3,000 4,000 Source: GIS data supplied by ! Towns Geoscience Australia, NRM&W Projection: MGA Zone 56 River Meters Locality Plan Date Printed: 15 August 2005 File: M:\41\14840\gis\maps\locality_a4 \borumba_locality_rev_b.mxd Creek 1:150,000 Size: A4 Figure 3.12.6 12 0 2 0 00 4 2 1 140 0 0

120

1 0 0

1 00

1 4 0

200 0 18 FLOW DIRECTION

0 2 2 0 22

1 2 2 0 0 0

1 6 0

1 4 0

0 4

Borumba Dam Raising 1

6 1

0 0 8 4 1 1 2 0 0

140

0 0 2

3 20

0 0 2 0 0 320 3

400

0 4 1 0 0 0 3 6 1

Legend South East Queensland ! Towns Highway Regional Water Supply Strategy

Proposed Damwall Major Road Borumba Dam Raising ² Yabba Creek AMTD 31.1km 20m Contour Cadastre 0 100 200 300 400 Source: GIS data supplied by Geoscience Australia, NRM&W Projection: MGA Zone 56 Meter s Dam Wall Location Date Printed: 15 August 2005 River File: M:\41\14840\gis\maps\dam_wall_a4 1:15,000 \borumba_damwall_rev_b.mxd Size: A4 Creek Figure 3.12.7 South East Queensland Regional Water Supply Strategy

Borumba Dam Raising Yabba Creek AMTD 31.1km

Satellite and Cadastral Plan

Figure 3.12.8

Legend

! Towns

Proposed Damwall

River

Creek

Highway

Major Road

200m Buffer Inundation Area FSL - 157.5m Cadastre

0 375 750 1,125 1,500

Meters

1:45,000

Source: GIS data supplied by Geoscience Australia, NRM&W Projection: MGA Zone 56 Date Printed: 15 August 2005 File: M:\41\14840\gis\maps\ satellite_a3\borumba_satellite_rev_2.mxd Size: A3 706900070690007069000 Reference PRg/gPRg/g Cadastral Boundary

Street Road

Main Road River Suburb Boundary 706850070685007068500 Dam Embankment (Not to Scale) ½½ Faults

Water Body BORUMBABORUMBA Qa • Quaternary BORUMBABORUMBA Alluvium: Clay, silt, sand, gravel; flood plain alluvium DCa/2DCa/2 DCaDCa PRg/g • Permian • Triassic 706800070680007068000 706800070680007068000 Granitoid Intrusion: Hornblende•biotite ½ granodiorite DCa • Late Devonian • Carboniferous Amamoor Beds: Mudstone; Slate, basic metavolcanics, chert, schist, jasper, greywacke

706750070675007067500 457000 457000 457000 457500 457500 457500 458000 458000 458000 458500 458500 458500 459000 459000 459000 459500 459500 459500 457000 457000 457000 457500 457500 457500 458000 458000 458000 458500 458500 458500 459000 459000 459000 459500 459500 459500 457000 457000 457000 457500 457500 457500 458000 458000 458000 458500 458500 458500 459000 459000 459000 459500 459500 459500

Borumba Damsite Geology

41•14840 Dec 2005 0 250 500 SEQ Regional Water Supply Strategy Metres # DNR&M 1:15000 MGA 94 Zone 56 Drawn By: JKW Checked By: MLP Copyright (C) GHD Pty Ltd 2005. This document shall remain the property of GHD Pty Ltd. The document may only be used for the purposes for which it was commissioned and in accordance with the Terms of Engagement for the commission. Figure 3•12•9 M:/41/14840/GIS/Borumba Geology

South East Queensland Regional Water Supply Strategy

Borumba Dam Raising Yabba Creek AMTD 31.1km

Land Use Plan

Figure 3.12.11

Legend ! Towns Proposed Damwall River Creek Highway Major Road 200m Buffer Inundation Area FSL - 157.5m Grazing natural vegetation Cropping Irrigated cropping Perennial horticulture Irrigated perennial horticulture Seasonal horticulture Irrigated seasonal horticulture Intensive horticulture Intensive animal production Lake Reservoir/dam River Nature conservation Marsh/wetland Production forestry Plantation forestry Other minimal use Residential Manufacturing and industrial Mining Services Transport and communication Utilities Waste treatment and disposal ² 0 325 650 975 1,300

Meters

1:60,000

Source: GIS data supplied by Geoscience Australia, NRM&W Projection: MGA Zone 56 Date Printed: 15 August 2005 File: M:\41\14840\gis\maps\landuse_a4 \borumba_landuse_rev_b.mxd Size: A4 South East Queensland Regional Water Supply Strategy

Borumba Dam Raising Yabba Creek AMTD 31.1km

Zoning and Strategic Plans

Figure 3.12.12

ble aila Av ata D ² o 0 325 650 975 1,300 N Meters 1:60,000

Source: GIS data supplied by Geoscience Australia, NR&M Projection: MGA Zone 56 Date Printed: 15 August 2005 File: m:\41\14840\gis\maps\ zoning_a4\borumba_zoning.mxd Size: A4 South East Queensland Regional Water Supply Strategy

Borumba Dam Raising Yabba Creek AMTD 31.1km

Environment and Vegetation Plan

Figure 3.12.13

Legend ! Towns Proposed Damwall River Creek Highway Major Road 200m Buffer Inundation Area FSL - 157.5m Regional Ecosystem Endangered (Dominant) Endangered (Sub-Dominant) Of Concern (Dominant) Of Concern (Sub-Dominant) Not Of Concern

² 0 320 640 960 1,280

Meters

1:60,000 Source: GIS data supplied by Geoscience Australia, NRM&W Projection: MGA Zone 56 Date Printed: 15 August 2005 File: m:\41\14840\gis\maps\ environment_a4\borumba_ environment_rev_b.mxd Size: A4

Map disclaimer: Regional ecosystem mapping, Version 5.0 Date: 13/12/05. Regional ecosystem linework reproduced at scale greater than 1:100,000, except in designated areas, should be used as a guide only. The positional accuracy of RE data mapped at a scale of 1:100,000 is 100 metres. Regional ecosystem mapping reproduced with permission of Environmental Protection Agency [2006]. While every care is taken to ensure the accuracy of the Information Product, the Environmental Protection Agency makes no representations or warranties about its accuracy , reliability, completeness or suitability for any particular purpose and disclaims all responsibility and all liability (including without limitation, liability in negligence) for all expenses, losses, damages (including indirect or consequential damage) and costs which you might incur as a result of the product being inaccurate or incomplete in any way and for any reason. Data must not be used for direct marketing or be used in breach of the privacy laws. South East Queensland Regional Water Supply Strategy

Borumba Dam Raising Yabba Creek AMTD 31.1km

Agricultural Land Capacity Plan

Figure 3.12.14

ble aila Av ata D ² o 0 325 650 975 1,300 N Meters 1:60,000

Source: GIS data supplied by Geoscience Australia, NR&M Projection: MGA Zone 56 Date Printed: 15 August 2005 File: m:\41\14840\gis\maps\ gqal_a4\borumba_gqal.mxd Size: A4

3.12.17 Cost Estimates The cost estimated for the FSL’s 142.3m and 157.47m, for a raised concrete faced rockfill embankment and the estimates for FSL’s of 157.47m, 170.5m and 192.1m for a new roller compacted concrete dam downstream, are contained in the following pages

41/14840/334064 Section 3.12 561 Borumba Dam Stage 3 Raise Date 10-Nov-05 BORUMBA DAM 10m RAISING - YABBA CREEK Revision A

AMTD 31.1 KM OPTION 1A: FSL 142.3m OPTION 1B: FSL 142.3m OPTION 1C: FSL 142.3m BSI04: PART 3, DESK TOP REVIEW OF IDENTIFIED DAM AND WEIR SITES Dam Crest Level = EL 153.37m Dam Crest Level = EL 152.69m Dam Crest Level = EL 152.06m PRE-FEASIBILITY COST ESTIMATE FOR DAM AND APPURTENANT WORKS Spillway Width = 32m Spillway Width = 38m Spillway Width = 45m

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

1 Project Establishment and Controls 1.1 Mobilisation of plant and equipment Item 500,000 500,000 500,000 1.2 Establishment, Temporary Works and Site Facilities Item 10.0% 2,753,824 10.0% 2,753,824 10.0% 2,753,824 1.3 Insurance costs Item 1.7% 468,150 1.7% 468,150 1.7% 468,150 1.4 Liason and Approvals Item 0.2% 55,076 0.2% 55,076 0.2% 55,076 1.5 Preparation and Implementation of QA and Work Place Health and Safety and other Management Plans Item 1.0% 275,382 1.0% 275,382 1.0% 275,382 1.6 Standards, Monitoring and Implementation of Environmental and Safety Management Item 3.0% 826,147 3.0% 826,147 3.0% 826,147 1.7 Preparation of Drawings, Survey and Operations Manuals Item 0.5% 137,691 0.5% 137,691 0.5% 137,691 1.8 Demobilisation of plant and equipment Item 350,000 350,000 350,000 SUB TOTAL 5,366,271 5,366,271 5,366,271 2 Preliminaries 2.1 Clearing ha 10 1,500.00 15,000 10 1,500.00 15,000 10 1,500.00 15,000 2.2 Dewatering and care of stream Item 200,000 300,000 400,000 2.3 Access Roads Item 200,000 200,000 200,000 SUB TOTAL 415,000 515,000 615,000 3 Embankment

3.1 Demolish parapet wall and slab section m2 185 71.00 13,135 185 71.00 13,135 185 71.00 13,135 3.2 Remove items (guard rail etc) Item 0.00 6,000 6,000 6,000 3.3 Excavation of overburden m3 16000 15.00 240,000 15000 15.00 225,000 14000 15.00 210,000 3.4 Plinth excavation m3 123 44.00 5,412 105 44.00 4,620 88 44.00 3,872 3.5 Removal of Zone 4 (Existing embankment) m3 1240 10.00 12,400 1240 10.00 12,400 1240 10.00 12,400

3.6 Zone 3a - from quarry m3 184290 6.00 1,105,740 164790 6.00 988,740 146810 6.00 880,860

3.7 Zone 2b m3 9780 45.00 440,100 8930 45.00 401,850 8160 45.00 367,200 3.8 Crest zone m3 2045 60.00 122,700 2015 60.00 120,900 1980 60.00 118,800 3.9 Road pavement m3 775 55.00 42,625 765 55.00 42,075 750 55.00 41,250 3.10 Bitumen surface on road m2 1705 15.00 25,575 1680 15.00 25,200 1650 15.00 24,750 3.11 Dental concrete m3 30 330.00 9,900 30 330.00 9,900 30 330.00 9,900 3.12 Shotcrete m3 30 500.00 15,000 30 500.00 15,000 30 500.00 15,000 3.13 Plinth concrete m3 137 750.00 102,750 117 750.00 87,750 98 750.00 73,500 3.14 Plinth reinforcement tonne 10.96 2,205.00 24,167 9.36 2,205.00 20,639 7.84 2,205.00 17,287 3.15 Perimetric water stops m 35 750.00 26,250 30 750.00 22,500 25 750.00 18,750 3.16 Drill and grout plinth anchor bars m 165 44.00 7,260 141 44.00 6,204 118 44.00 5,192 3.17 Supply and place anchor bars tonne 1 2,205.00 2,205 1 2,205.00 2,205 1 2,205.00 2,205

3.18 Support rib concrete m3 82 430.00 35,260 74 430.00 31,820 66 430.00 28,380

3.19 Face slab concrete m3 970 750.00 727,500 862 750.00 646,500 763 750.00 572,250 3.20 Face slab reinforcement tonne 61 2,205.00 134,505 54.2 2,205.00 119,511 48 2,205.00 105,840

3.21 Face slab water stops (new concrete) m 392 380.00 148,960 350 380.00 133,000 315 380.00 119,700

Page 1 of 14 Date 10-Nov-05 BORUMBA DAM 10m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

3.22 Face slab water stops (new / existing concrete) m 330 670.00 221,100 330 670.00 221,100 330 670.00 221,100 3.23 Parapet wall concrete m 908 790.00 717,320 894 790.00 706,260 880 790.00 695,200 3.24 Parapet wall reinforcement tonne 68.6 2,205.00 151,263 67.6 2,205.00 149,058 66.6 2,205.00 146,853 3.25 Supply and install guard rails m 305 350.00 106,750 300 350.00 105,000 295 350.00 103,250 3.26 Instrumentation Item 200,000 200,000 200,000 SUB TOTAL 4,643,877 4,316,367 4,012,674 4 Spillway Construction 4.1 Right Wall 4.1.1 Excavation of embankment 4.1.1.1 Removal of face slabs m2 510 71.00 36,210 500 71.00 35,500 830 71.00 58,930 4.1.1.2 Excavation of rock fill m3 15060 12.00 180,720 14540 12.00 174,480 18000 12.00 216,000 4.1.2 Excavation of overburden m3 1130 15.00 16,950 880 15.00 13,200 220 15.00 3,300 4.1.3 Scabblling existing walls m2 986 30.00 29,580 986 30.00 29,580 986 30.00 29,580 4.1.4 Drill and grout anchor bars m 680 44.00 29,920 680 44.00 29,920 680 44.00 29,920 4.1.5 Supply and install anchor bars tonne 12.9 2,205.00 28,445 12.9 2,205.00 28,445 12.9 2,205.00 28,445 4.1.6 Concrete m3 17500 550.00 9,625,000 15065 550.00 8,285,750 12950 550.00 7,122,500 4.1.7 Reinforcement tonne 82.7 2,205.00 182,354 79.6 2,205.00 175,518 76.9 2,205.00 169,565 4.1.8 Waterstop (in new concrete) m 46 100.00 4,600 45 100.00 4,500 42 100.00 4,200 4.1.9 Waterstop (in new / existing concrete) m 300 350.00 105,000 300 350.00 105,000 300 350.00 105,000 4.1.10 Reinstate embankment

4.1.10.1 Rockfill (zone 1 existing embankment) m3 13425 21.00 281,925 12940 21.00 271,740 15320 21.00 321,720

4.1.10.2 Rockfill (zone 2 existing embankment) m3 1635 40.00 65,400 1600 40.00 64,000 2650 40.00 106,000 4.1.10.3 Slab rib support concrete m3 19 330.00 6,270 18 330.00 5,940 32 330.00 10,560 4.1.10.4 Slab concrete m3 153 750.00 114,750 150 750.00 112,500 250 750.00 187,500 4.1.10.5 Slab reinforcement tonne 9.6 2,205.00 21,168 9.4 2,205.00 20,727 15.6 2,205.00 34,398 4.1.10.6 Slab water stop (new concrete) m 87 380.00 33,060 85 380.00 32,300 150 380.00 57,000 4.1.10.7 Slab water stop (new / existing concrete) m 25 670.00 16,750 25 670.00 16,750 25 670.00 16,750 4.2 Left Wall 4.2.1 Drill and grout anchor bars m 2000 44.00 88,000 2000 44.00 88,000 2550 44.00 112,200 4.2.2 Supply and install anchor bars tonne 13.3 2,205.00 29,327 13.3 2,205.00 29,327 17 2,205.00 37,485

4.2.3 Concrete m3 1520 1,500.00 2,280,000 1480 1,500.00 2,220,000 1930 1,500.00 2,895,000

4.2.4 Reinforcement tonne 182.4 2,205.00 402,192 177.6 2,205.00 391,608 231.6 2,205.00 510,678 4.2.5 Waterstop (in new concrete) m 71 42.00 2,982 69 100.00 6,900 112 100.00 11,200

4.2.6 Waterstop (in new / existing concrete) m3 31 336.00 10,416 31 350.00 10,850 31 350.00 10,850 4.3 Crest 4.3.1 Drill and grout anchor bars m 1218 44.00 53,592 1344 44.00 59,136 1512 44.00 66,528

4.3.2 Supply and install anchor bars tonne 10.6 2,205.00 23,373 11.7 2,205.00 25,799 13.1 2,205.00 28,886

4.3.3 Concrete m3 5785 530.00 3,066,050 6410 530.00 3,397,300 7300 530.00 3,869,000

Page 2 of 14 Date 10-Nov-05 BORUMBA DAM 10m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

4.3.4 Reinforcement tonne 20.6 2,205.00 45,423 22.5 2,205.00 49,613 25 2,205.00 55,125 4.3.5 Waterstop (in new concrete) m 156 42.00 6,552 156 100.00 15,600 142 100.00 14,200 4.3.6 Waterstop (in new / existing concrete) m 0 336.00 0 0 350.00 0 12 350.00 4,200 4.4 Protection slab 4.4.1 Cleanoff m2 410 336.00 137,760 410 350.00 143,500 575 350.00 201,250 4.4.2 Drill and grout anchor bars m 822 44.00 36,168 822 44.00 36,168 1150 44.00 50,600 4.4.3 Supply and install anchor bars tonne 5.5 2,205.00 12,128 5.5 2,205.00 12,128 7.6 2,205.00 16,758 4.4.4 Concrete m3 125 1,500.00 187,500 125 1,500.00 187,500 172 1,500.00 258,000 4.4.5 Reinforcement tonne 12.5 2,205.00 27,563 12.5 2,205.00 27,563 17.2 2,205.00 37,926 4.4.6 Waterstop (in new concrete) m 74 42.00 3,108 74 100.00 7,400 95 100.00 9,500 4.4.7 Waterstop (in new / existing concrete) m 41 336.00 13,776 41 350.00 14,350 40 350.00 14,000 SUB TOTAL 17,204,010 16,128,589 16,704,753 5 Changes / Ugrade to Existing Outlet Works 5.1 Valve House 5.1.1 Cleanoff m2 54 20.00 1,080 46 20.00 920 32 20.00 640 5.1.2 Scabblling m2 151 30.00 4,530 151 30.00 4,530 151 30.00 4,530 5.1.3 Strengthening concrete m3 123 1,500.00 184,500 109 1,500.00 163,500 95 1,500.00 142,500 5.1.4 Reinforcement for strengthening concrete tonne 9 2,205.00 19,845 8 2,205.00 18,522 8 2,205.00 16,758 5.1.5 Concrete for retaining walls m3 143 1,500.00 214,500 105 1,500.00 157,500 50 1,500.00 75,000 5.1.6 Reinforcement for retaining walls tonne 21 2,205.00 46,305 15 2,205.00 33,075 8 2,205.00 17,640

5.1.7 Access Roads m3 5,100 20.00 102,000 5,100 20.00 102,000 5,100 20.00 102,000 5.2 Conduit Item 200,000 200,000 200,000 SUB TOTAL 772,760 680,047 559,068

6 Additional Outlet Works 6.1 Excavation of embankment 6.1.1 Demolision of slabs m2 1,295 85.00 110,075 1,295 85.00 110,075 1,295 85.00 110,075 6.1.2 Excavate rockfill and remove slabs m3 12,200 12.00 146,400 12,200 12.00 146,400 12,200 12.00 146,400 6.2 Conduit

6.2.1 Inlet tower base concrete m3 638 1,500.00 957,000 638 1,500.00 957,000 638 1,500.00 957,000

6.2.2 Inlet tower base reinforcement tonne 12 2,205.00 26,681 12 2,205.00 26,681 12 2,205.00 26,681 6.2.3 Seating frame for inlet tower base Item 5,000 5,000 5,000 6.2.4 Backfill concrete m3 290 550.00 159,500 277 550.00 152,350 266 550.00 146,300 6.2.5 Conduit concrete m3 157 1,500.00 235,500 153 1,500.00 229,500 149 1,500.00 223,500 6.2.6 Conduit reinforcement tonne 36 2,205.00 79,601 35 2,205.00 77,616 34 2,205.00 75,632

6.2.7 Thrust block backfill concrete m3 68 330.00 22,440 68 330.00 22,440 68 330.00 22,440 6.2.8 Thrush block concrete m3 74 530.00 39,220 74 530.00 39,220 74 530.00 39,220 6.2.9 Thrust block reinforcement tonne 1 2,205.00 2,205 1 2,205.00 2,205 1 2,205.00 2,205

6.2.10 Supply and install mild steel pipe @ I.T. base - first flange V.H. m 94 3,000.00 282,600 92 3,000.00 277,200 91 3,000.00 272,400

Page 3 of 14 Date 10-Nov-05 BORUMBA DAM 10m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

6.2.11 Supply and install ductile iron pipe @ I.T. base - first flange V.H. m 77 356.00 27,519 76 356.00 26,878 74 356.00 26,308 6.3 Inlet Tower (excluding base) 6.3.1 Concrete m3 224 1,500.00 336,000 219 1,500.00 328,500 213 1,500.00 319,500 6.3.2 Reinforcement tonne 26.88 2,205.00 59,270 26.28 2,205.00 57,947 25.56 2,205.00 56,360 6.3.3 Bulkhead gate and frame Item 5,000 5,000 5,000 6.3.4 Trashracks and baulks Item 80,000 80,000 80,000 6.3.5 Lifting equipement (hoists etc) Item 35,000 35,000 35,000 6.3.6 Metalworks and baulk guides Item 12,000 12,000 12,000 6.3.7 Low flow control Item 5,000 5,000 5,000 6.4 Valve House 6.4.1 Backfill concrete m3 292 330.00 96,360 292 330.00 96,360 292 330.00 96,360 6.4.2 Concrete m3 286 1,500.00 429,000 286 1,500.00 429,000 286 1,500.00 429,000 6.4.3 Reinforcement tonne 28.6 2,205.00 63,063 28.6 2,205.00 63,063 28.6 2,205.00 63,063 6.4.4 Mild steel pipework Item 53,000 53,000 53,000 6.4.5 Ductile iron pipework and valves Item 7,000 7,000 7,000 6.4.6 Valves (Butterfly and reg) Item 830,000 830,000 830,000 6.4.7 Metalwork Item 30,000 30,000 30,000 6.4.8 Excavation of overburden m3 570 10.00 5,700 570 10.00 5,700 570 10.00 5,700 6.5 Channel 00 6.5.1 Excavation of overburden m3 1100 10.00 11,000 1100 10.00 11,000 1100 10.00 11,000

6.5.2 Backfill concrete m3 200 330.00 66,000 200 330.00 66,000 200 330.00 66,000 6.5.3 Drill and grout anchor bars m3 300 44.00 13,200 300 44.00 13,200 300 44.00 13,200 6.5.4 Supply and install anchor bars tonne 2.1 2,205.00 4,631 2.1 2,205.00 4,631 2.1 2,205.00 4,631 6.5.5 Concrete m3 175 1,500.00 262,500 175 1,500.00 262,500 175 1,500.00 262,500 6.5.6 Reinforcement tonne 14 2,205.00 30,870 14 2,205.00 30,870 14 2,205.00 30,870

6.5.7 Waterstop m3 200 35.00 7,000 200 35.00 7,000 200 35.00 7,000

6.6 Reinstate embankment 6.6.1 Rockfill (zone 1 existing embankment) m3 10850 21.00 227,850 10850 21.00 227,850 10850 21.00 227,850 6.6.2 Rockfill (zone 2 existing embankment) m3 1350 40.00 54,000 1350 40.00 54,000 1350 40.00 54,000 6.6.3 Slab rib support concrete m3 40 1,500.00 60,000 40 1,500.00 60,000 40 1,500.00 60,000 6.6.4 Slab concrete m3 365 750.00 273,750 365 750.00 273,750 365 750.00 273,750 6.6.5 Slab reinforcement tonne 23 2,205.00 50,715 23 2,205.00 50,715 23 2,205.00 50,715 6.6.6 Slab water stop (new concrete) m 160 380.00 60,800 160 380.00 60,800 160 380.00 60,800

6.7 Access Bridge

6.7.1 Peir concrete m3 100 1,500.00 150,000 100 1,500.00 150,000 100 1,500.00 150,000

6.7.2 Pier reinforcement tonne 15 2,205.00 33,075 15 2,205.00 33,075 15 2,205.00 33,075

6.7.3 Prestressed bridge girders m3 71.4 2,000.00 142,800 66.9 2,000.00 133,800 64.7 2,000.00 129,400

Page 4 of 14 Date 10-Nov-05 BORUMBA DAM 10m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

6.7.4 Bridge deck pavement m3 8.7 500.00 4,350 8.2 500.00 4,100 7.9 500.00 3,950 6.7.5 Metalwork tonne 1.44 6,000.00 8,640 1.3 6,000.00 7,800 1.31 6,000.00 7,860 SUB TOTAL 5,601,314 5,561,225 5,526,744 7 Miscellaneous 7.1 Miscellaneous steelwork to intake tower and valve house Item 20,000 20,000 20,000 7.2 Alterations to service utilities Item 100,000 100,000 100,000 SUB TOTAL 120,000 120,000 120,000

TOTAL CAPITAL CONTRACT COST 34,123,231 32,687,499 32,904,509 8 Unestimated Items 8.1 Unestimated Items Contingency (15% of Capital Contract Cost) Item 5,118,485 4,903,125 4,935,676 SUB TOTAL 5,118,485 4,903,125 4,935,676

TOTAL CONTRACT COST 39,241,716 37,590,624 37,840,186 9 Indirect Costs 9.1 General Contingency (30% Contract Cost) Item 11,772,515 11,277,187 11,352,056 9.2 Investigation, Design and Construction Supervision (15% of Contract Cost) Item 5,886,257 5,638,594 5,676,028 9.3 Owners Costs (10 % of Contract Cost + Indirect Costs) Item 5,690,049 5,450,641 5,486,827 SUB TOTAL 23,348,821 22,366,421 22,514,911

TOTAL CAPITAL COSTOption 1A 62,590,537 Option 1B 59,957,046Option 1C 60,355,097

Page 5 of 14 Date 10-Nov-05 BORUMBA DAM 25m RAISING - YABBA CREEK Revision A

AMTD 31.1 KM OPTION 2A: FSL 157.5m OPTION 2B: FSL 157.5m OPTION 2C: FSL 157.5m BSI04: PART 3, DESK TOP REVIEW OF IDENTIFIED DAM AND WEIR SITES Dam Crest Level = EL 172.12m Dam Crest Level = EL 169.02m Dam Crest Level = EL 167.24m PRE-FEASIBILITY COST ESTIMATE FOR DAM AND APPURTENANT WORKS Spillway Width = 30m Spillway Width = 50m Spillway Width = 70m

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

1 Project Establishment and Controls 1.1 Mobilisation of plant and equipment Item 500,000 500,000 500,000

1.2 Establishment, Temporary Works and Site Facilities Item 10.0% 6,406,129 10.0% 6,393,541 10.0% 6,393,541

1.3 Insurance costs Item 1.7% 1,089,042 1.7% 1,086,902 1.7% 1,086,902

1.4 Liason and Approvals Item 0.2% 128,123 0.2% 127,871 0.2% 127,871

1.5 Preparation and Implementation of QA and Work Place Health and Safety and other Management Plans Item 1.0% 640,613 1.0% 639,354 1.0% 639,354 1.6 Standards, Monitoring and Implementation of Environmental and Safety Management Item 3.0% 1,921,839 3.0% 1,918,062 3.0% 1,918,062 1.7 Preparation of Drawings, Survey and Operations Manuals Item 0.5% 320,306 0.5% 319,677 0.5% 319,677 1.8 Demobilisation of plant and equipment Item 350,000 350,000 350,000 SUB TOTAL 11,356,051 11,335,407 11,335,407

2 Preliminaries 2.1 Clearing ha 951 1,500.00 1,426,056 951 1,500.00 1,426,056 951 1,500.00 1,426,056

2.2 Dewatering and care of stream Item 200,000 200,000 200,000

2.3 Access Roads Item 200,000 200,000 200,000

2.4 Grouting m3 5,580 160.00 892,800 5,220 160.00 835,200 5,040 160.00 806,400 SUB TOTAL 2,718,856 2,661,256 2,632,456

3 Embankment

3.1 Demolish parapet wall and slab section m2 185 71.00 13,135 185 71.00 13,135 185 71.00 13,135

3.2 Remove items (guard rail etc) Item 6,000 6,000 6,000

3.3 Excavation of overburden m3 85000 15.00 1,275,000 78000 15.00 1,170,000 73000 15.00 1,095,000

3.4 Plinth excavation m3 1000 44.00 44,000 930 44.00 40,920 875 44.00 38,500 3.5 Removal of Zone 4 (Existing embankment) m3 1240 10.00 12,400 1240 10.00 12,400 1240 10.00 12,400

3.6 Zone 3a - from spillway m3 215700 6.00 1,294,200 274450 6.00 1,646,700 339750 6.00 2,038,500 3.7 Zone 3a - from quarry m3 813343 21.00 17,080,203 584389 21.00 12,272,169 428140 21.00 8,990,940

3.8 Zone 2b m3 46510 45.00 2,092,950 40960 45.00 1,843,200 37812 45.00 1,701,540 3.9 Crest zone m3 3235 60.00 194,100 3035 60.00 182,100 3005 60.00 180,300

3.10 Road pavement m3 1290 55.00 70,950 1215 55.00 66,825 1150 55.00 63,250 3.11 Bitumen surface on road m2 2830 15.00 42,450 2670 15.00 40,050 2530 15.00 37,950 3.12 Dental concrete m3 50 330.00 16,500 50 330.00 16,500 50 330.00 16,500

3.13 Shotcrete m3 50 500.00 25,000 50 500.00 25,000 50 500.00 25,000 3.14 Plinth concrete m3 1110 750.00 832,500 1035 750.00 776,250 975 750.00 731,250

3.15 Plinth reinforcement tonne 88.8 2,205.00 195,804 82.8 2,205.00 182,574 78 2,205.00 171,990 3.16 Perimetric water stops m 285 750.00 213,750 265 750.00 198,750 250 750.00 187,500

Page 6 of 14 Date 10-Nov-05 BORUMBA DAM 25m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

3.17 Drill and grout plinth anchor bars m 1340 44.00 58,960 1245 44.00 54,780 1175 44.00 51,700

3.18 Supply and place anchor bars tonne 5.7 2,205.00 12,569 5.3 2,205.00 11,687 5 2,205.00 11,025

3.19 Support rib concrete m3 490 430.00 210,700 460 430.00 197,800 400 430.00 172,000 3.20 Face slab concrete m3 5217 750.00 3,912,750 4573 750.00 3,429,750 4204 750.00 3,153,000 3.21 Face slab reinforcement tonne 260.85 2,205.00 575,174 228.65 2,205.00 504,173 210.2 2,205.00 463,491

3.22 Face slab water stops (new concrete) m 2000 380.00 760,000 1850 380.00 703,000 1575 380.00 598,500

3.23 Face slab water stops (new / existing concrete) m 330 670.00 221,100 330 670.00 221,100 330 670.00 221,100

3.24 Parapet wall concrete m 1485 790.00 1,173,150 1430 790.00 1,129,700 1390 790.00 1,098,100

3.25 Parapet wall reinforcement tonne 178.2 2,205.00 392,931 171.6 2,205.00 378,378 166.8 2,205.00 367,794

3.26 Supply and install guard rails m 560 350.00 196,000 530 350.00 185,500 505 350.00 176,750

3.27 Instrumentation Item 200,000 200,000 200,000 SUB TOTAL 31,122,276 25,508,441 21,823,215

4 Spillway Construction

4.1 Excavation of overburden m3 84900 15.00 1,273,500 104700 15.00 1,570,500 126700 15.00 1,900,500

4.2 Excavation of rock m3 215700 15.00 3,235,500 274450 15.00 4,116,750 339750 15.00 5,096,250

4.3 Backfill behind walls m3 3500 20.00 70,000 3500 20.00 70,000 3500 20.00 70,000 4.4 Drill and grout anchor bars m 6400 44.00 281,600 10000 44.00 440,000 14000 44.00 616,000

4.5 Supply and install anchor bars tonne 53 2,205.00 116,865 82.8 2,205.00 182,574 116 2,205.00 255,780

4.6 Backfill concrete m3 2560 260.00 665,600 4000 260.00 1,040,000 5600 260.00 1,456,000 4.7 Crest concrete m3 816 530.00 432,480 1275 530.00 675,750 1785 530.00 946,050 4.8 Crest reinforcement tonne 39.9 2,205.00 87,980 62.4 2,205.00 137,592 87.4 2,205.00 192,717

4.9 Floor concrete m3 1846 450.00 830,700 2885 450.00 1,298,250 4040 450.00 1,818,000

4.10 Floor reinforcement tonne 184.6 2,205.00 407,043 288.5 2,205.00 636,143 404 2,205.00 890,820

4.11 Flip structure concrete m3 1091 550.00 600,050 1705 550.00 937,750 2390 550.00 1,314,500

4.12 Flip structure reinforcement tonne 109.1 2,205.00 240,566 170.5 2,205.00 375,953 239 2,205.00 526,995

4.13 Apron concrete m3 290 1,500.00 435,000 450 1,500.00 675,000 630 1,500.00 945,000

4.14 Apron reinforcement tonne 29 2,205.00 63,945 45 2,205.00 99,225 63 2,205.00 138,915

4.15 Wall concrete m3 5428 300.00 1,628,400 3565 300.00 1,069,500 2725 300.00 817,500

4.16 Wall concrete (reinforced) m3 670 550.00 368,500 670 550.00 368,500 670 550.00 368,500 4.17 Wall reinforcement tonne 80.4 2,205.00 177,282 80.4 2,205.00 177,282 80.4 2,205.00 177,282 4.18 Pier concrete m3 75 550.00 41,250 61.5 550.00 33,825 105 550.00 57,750 4.19 Pier reinforcement tonne 7.5 2,205.00 16,538 6.2 2,205.00 13,671 10.5 2,205.00 23,153 4.20 Prestressed bridge girders m3 84.3 2,000.00 168,600 141 2,000.00 282,000 195 2,000.00 390,000 4.21 Bridge deck pavement m3 11.2 500.00 5,600 17.5 500.00 8,750 24.5 500.00 12,250

Page 7 of 14 Date 10-Nov-05 BORUMBA DAM 25m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

4.22 Drill drainage holes m 655 45.00 29,475 1020 45.00 45,900 1430 45.00 64,350

4.23 Underdrains m 300 150.00 45,000 500 150.00 75,000 700 150.00 105,000

4.24 Water stop m 600 60.00 36,000 1000 60.00 60,000 1230 60.00 73,800

4.25 Bridge guardrails Item 17,400 27,000 37,800 SUB TOTAL 11,274,873 14,416,914 18,294,912 5 Changes / Ugrade to Existing Outlet Works 5.1 Oulet Works 5.1.1 Inlet Tower Bulkhead Gate Item 27,000 27,000 27,000

5.2 Conduit Item 200,000 200,000 200,000

5.3 Existing Valve House 5.3.1 Demolition of structures Item 53,000 53,000 53,000

5.3.2 Remove pipework and valves Item 4,000 4,000 4,000

5.3.3 Supply and install blank flanges Item 14,000 14,000 14,000

5.3.4 Fill concrete m3 152 1,500.00 228,000 152 1,500.00 228,000 152 1,500.00 228,000 5.3.5 Concrete for cover slab m3 40 2,000.00 80,000 40 2,000.00 80,000 40 2,000.00 80,000

5.3.6 Reinforcement for cover slab tonne 16 2,205.00 35,280 16 2,205.00 35,280 16 2,205.00 35,280

5.4 Extension of conduit 5.4.1 Remove tapered offtake pipe Item 5,000 5,000 5,000

5.4.2 Thrust block concrete m3 40 1,500.00 60,000 40 1,500.00 60,000 40 1,500.00 60,000 5.4.3 Thrust block anchor dowls Item 10,000 10,000 10,000

5.4.4 Thurst block reinforcement tonne 1 2,205.00 2,205 1 2,205.00 2,205 1 2,205.00 2,205

5.4.5 Backfill concrete m3 560 300.00 168,000 340 300.00 102,000 230 300.00 69,000 5.4.6 Drill and grout anchors m 54 44.00 2,376 54 44.00 2,376 54 44.00 2,376

5.4.7 Supply and place anchor bars tonne 1 2,205.00 1,544 1 2,205.00 1,323 1 2,205.00 2,205

5.4.8 Concrete anchors m3 4,187 550.00 2,302,850 3,691 550.00 2,030,050 3,256 550.00 1,790,800

5.4.9 Anchor reinforcement tonne 18 2,205.00 39,690 16 2,205.00 35,280 14 2,205.00 30,870

5.4.10 Pipework m 68 2,700.00 183,600 60 2,700.00 162,000 53 2,700.00 143,100

5.5 New Valve House

5.5.1 Backfill concrete m3 484 550.00 266,200 492 550.00 270,600 348 550.00 191,400 5.5.2 Concrete m3 561 1,500.00 841,500 561 1,500.00 841,500 561 1,500.00 841,500 5.5.3 Reinforcement tonne 46 2,205.00 101,430 46 2,205.00 101,430 46 2,205.00 101,430 5.5.4 Mild steel pipework Item 125,000 125,000 125,000 5.5.5 Ductile iron pipework and valves Item 7,000 7,000 7,000 5.5.6 Valves (Butterfly and reg) Item 830,000 830,000 830,000

Page 8 of 14 Date 10-Nov-05 BORUMBA DAM 25m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

5.5.7 Metalwork Item 8,000 8,000 8,000

5.5.8 Hatches Item 70,000 70,000 70,000

5.5.9 Lifting equipement (hoists etc) Item 24,000 24,000 24,000 SUB TOTAL 5,689,675 5,329,044 4,955,166 6 Additional Outlet Works 6.1 Excavation of embankment

6.1.1 Demolision of slabs m2 1,295 85.00 110,075 1,295 85.00 110,075 1,295 85.00 110,075

6.1.2 Excavate rockfill and remove slabs m3 12,200 12.00 146,400 12,200 12.00 146,400 12,200 12.00 146,400

6.2 Conduit 6.2.1 Inlet tower base concrete m3 960 550.00 528,000 960 550.00 528,000 960 550.00 528,000

6.2.2 Inlet tower base reinforcement tonne 16 2,205.00 35,280 15 2,205.00 33,075 15 2,205.00 33,075

6.2.3 Seating frame for inlet tower base Item 5,000 5,000 5,000

6.2.4 Backfill concrete m3 1,060 260.00 275,600 910 260.00 236,600 800 260.00 208,000 6.2.5 Conduit concrete m3 263 1,500.00 394,500 244 1,500.00 366,000 231 1,500.00 346,500 6.2.6 Conduit reinforcement tonne 61 2,205.00 134,505 56 2,205.00 123,480 53 2,205.00 116,865

6.2.7 Thrust block backfill concrete m3 162 330.00 53,460 213 330.00 70,290 221 330.00 72,930 6.2.8 Thrush block concrete m3 74 530.00 39,220 74 530.00 39,220 74 530.00 39,220

6.2.9 Thrust block reinforcement tonne 1 2,205.00 2,205 1 2,205.00 2,205 1 2,205.00 2,205

6.2.10 Supply and install mild steel pipe @ I.T. base - first flange V.H. m 130 3,000.00 390,000 122 3,000.00 366,000 117 3,000.00 351,000

6.2.11 Supply and install ductile iron pipe @ I.T. base - first flange V.H. m 126 356.00 44,856 118 356.00 42,008 113 356.00 40,228

6.3 Inlet Tower (excluding base)

6.3.1 Concrete m3 392 1,500.00 588,000 366 1,500.00 549,000 350 1,500.00 525,000 6.3.2 Reinforcement tonne 47 2,205.00 103,723 44 2,205.00 96,844 42 2,205.00 92,610

6.3.3 Bulkhead gate and frame Item 5,000 5,000 5,000

6.3.4 Trashracks and baulks Item 154,700 142,800 135,800

6.3.5 Lifting equipement (hoists etc) Item 35,000 35,000 35,000

6.3.6 Metalworks and baulk guides Item 15,000 15,000 15,000

6.3.7 Low flow control Item 5,000 5,000 5,000

6.4 Valve House 6.4.1 Backfill concrete m3 170 330.00 56,100 484 330.00 159,720 578 330.00 190,740 6.4.2 Concrete m3 286 1,500.00 429,000 286 1,500.00 429,000 286 1,500.00 429,000

6.4.3 Reinforcement tonne 28.6 2,205.00 63,063 28.6 2,205.00 63,063 28.6 2,205.00 63,063 6.4.4 Mild steel pipework Item 53,000 53,000 53,000 6.4.5 Ductile iron pipework and valves Item 7,000 7,000 7,000

Page 9 of 14 Date 10-Nov-05 BORUMBA DAM 25m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

6.4.6 Valves (Butterfly and reg) Item 830,000 830,000 830,000

6.4.7 Metalwork Item 30,000 30,000 30,000

6.4.8 Excavation of overburden m3 550 10.00 5,500 220 10.00 2,200 170 10.00 1,700 6.5 Channel 00 6.5.1 Excavation of overburden m3 3860 10.00 38,600 3300 10.00 33,000 2350 10.00 23,500 6.5.2 Excavation of rock m3 5270 40.00 210,800 4400 40.00 176,000 2660 40.00 106,400

6.5.3 Backfill concrete m3 94 330.00 31,020 90 330.00 29,700 82 330.00 27,060

6.5.4 Drill and grout anchor bars m3 168 44.00 7,392 162 44.00 7,128 144 44.00 6,336 6.5.5 Supply and install anchor bars tonne 1 2,205.00 2,205 1 2,205.00 2,205 1 2,205.00 2,205

6.5.6 Concrete m3 94 1,500.00 141,000 90 1,500.00 135,000 82 1,500.00 123,000 6.5.7 Reinforcement tonne 7.52 2,205.00 16,582 7.2 2,205.00 15,876 6.56 2,205.00 14,465

6.5.8 Waterstop m3 55 35.00 1,925 52 35.00 1,820 47 35.00 1,645

6.6 Reinstate embankment 6.6.1 Rockfill (zone 1 existing embankment) m3 10850 21.00 227,850 10850 21.00 227,850 10850 21.00 227,850

6.6.2 Rockfill (zone 2 existing embankment) m3 1350 40.00 54,000 1350 40.00 54,000 1350 40.00 54,000 6.6.3 Slab rib support concrete m3 40 1,500.00 60,000 40 1,500.00 60,000 40 1,500.00 60,000 6.6.4 Slab concrete m3 365 750.00 273,750 365 750.00 273,750 365 750.00 273,750

6.6.5 Slab reinforcement tonne 23 2,205.00 50,715 23 2,205.00 50,715 23 2,205.00 50,715

6.6.6 Slab water stop (new concrete) m 160 380.00 60,800 160 380.00 60,800 160 380.00 60,800

6.7 Access Bridge

6.7.1 Peir concrete m3 155 1,500.00 232,500 145 1,500.00 217,500 145 1,500.00 217,500

6.7.2 Pier reinforcement tonne 23.25 2,205.00 51,266 21.75 2,205.00 47,959 21.75 2,205.00 47,959

6.7.3 Prestressed bridge girders m3 152 2,000.00 304,000 141 2,000.00 282,000 135 2,000.00 270,000

6.7.4 Bridge deck pavement m3 15 500.00 7,500 14 500.00 7,000 13 500.00 6,500 6.7.5 Metalwork tonne 3 6,000.00 18,000 3 6,000.00 18,000 2 6,000.00 12,000 SUB TOTAL 6,329,092 6,191,282 6,003,096

7 Miscellaneous

7.1 Miscellaneous steelwork to intake tower and valve house Item 20,000 20,000 20,000

7.2 Alterations to service utilities Item 100,000 100,000 100,000 SUB TOTAL 120,000 120,000 120,000 TOTAL CAPITAL CONTRACT COST 68,610,822 65,562,344 65,164,251

8 Unestimated Items 8.1 Unestimated Items Contingency (15% of Capital Contract Cost) Item 10,291,623 9,834,352 9,774,638 SUB TOTAL 10,291,623 9,834,352 9,774,638

TOTAL CONTRACT COST 78,902,446 75,396,696 74,938,889

Page 10 of 14 Date 10-Nov-05 BORUMBA DAM 25m RAISING - YABBA CREEK Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

9 Indirect Costs 9.1 General Contingency (30% Contract Cost) Item 23,670,734 22,619,009 22,481,667

9.2 Investigation, Design and Construction Supervision (15% of Contract Cost) Item 11,835,367 11,309,504 11,240,833 9.3 Owners Costs (10 % of Contract Cost + Indirect Costs) Item 11,440,855 10,932,521 10,866,139 SUB TOTAL 46,946,955 44,861,034 44,588,639

TOTAL CAPITAL COSTOption 2A 125,849,401 Option 2B 120,257,730Option 2C 119,527,528

Page 11 of 14 Date 30-Sep-05 BORUMBA DAM - YABBA CREEK Revision A

AMTD 31.1 KM OPTION 3A: RCC, FSL =157.5m OPTION 4A: RCC, FSL =170.49m OPTION 5A: RCC, FSL = 192.14m

BSI04: PART 3, DESK TOP REVIEW OF IDENTIFIED DAM AND WEIR SITES DAM CREST LEVEL = EL 162.5m DAM CREST LEVEL = EL 175.49m DAM CREST LEVEL = EL 197.14m PRE-FEASIBILITY COST ESTIMATE FOR DAM AND APPURTENANT WORKS SPILLWAY WIDTH = 200m SPILLWAY WIDTH = 200m SPILLWAY WIDTH = 200m

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

1 Project Establishment and Controls

1.1 Mobilisation of plant and equipment Item 500,000 500,000 500,000

1.2 Establishment, Temporary Works and Site Facilities Item 10.0% 6,138,000 10.0% 10,886,107 10.0% 17,514,000

1.3 Insurance costs Item 1.7% 1,044,000 1.7% 1,850,638 1.7% 2,977,000

1.4 Liason and Approvals Item 0.2% 123,000 0.2% 217,722 0.2% 350,000

1.5 Preparation and Implementation of QA and Work Place Health and Safety and other Management Plans Item 1.0% 614,000 1.0% 1,088,611 1.0% 1,751,000

1.6 Standards, Monitoring and Implementation of Environmental and Safety Management Item 3.0% 1,842,000 3.0% 3,265,832 3.0% 5,254,000

1.7 Preparation of Drawings, Survey and Operations Manuals Item 0.5% 307,000 0.5% 544,305 0.5% 876,000

1.8 Demobilisation of plant and equipment Item 350,000 350,000 350,000 SUB TOTAL 10,918,000 18,703,216 29,572,000

2 Preliminaries

2.1 Clearing of Ponded Areas ha 951 1,500.00 1,426,056 1,569 1,500.00 2,354,166 2,653 1,500.00 3,979,566

2.2 Public Amenities Item

2.3 Access Roads Item SUB TOTAL 1,426,056 2,354,166 3,979,566

3 Diversion and Care of Stream

3.1 Diversion and Care of Stream (including cofferdam) Item 50,000 50,000 50,000

3.2 Excavation of Inlet / Outlet Channel (a) Rock m3 1875 44.00 82,500 1875 44.00 82,500 1875 44.00 82,500

3.3 Excavation of Inlet / Outlet Channel (b) Weathered Rock and Soil m3 5000 20.00 100,000 5000 20.00 100,000 5000 20.00 100,000

3.4 Excavation of Conduit (a) Sandstone m3 0 44.00 0 0 44.00 0 0 44.00 0

3.5 Excavation of Inlet Tower (a) Rock m3 0 44.00 0 0 44.00 0 0 44.00 0

3.6 Drilll holes supplied and grout anchor bars (Conduit at base of Tower) m 0 85.00 0 0 85.00 0 540 85.00 45,900

3.7 Drilll holes supplied and grout earthing bars m 18 315.00 5,670 18 315.00 5,670 18 315.00 5,670

3.8 Conduit Concrete m3 9.375 530.00 4,969 14.0625 530.00 7,453 18.75 530.00 9,938

3.9 Reinforcing bars and conduit tonne 1.125 2,205.00 2,481 1.6875 2,205.00 3,721 2.25 2,205.00 4,961

3.10 Supply and install MS pipes and specials for conduit (includes low flow line and dewatering / filling line) Item 15,000 22,500 30,000

3.11 Conduit closure Item 20,000 20,000 20,000

3.12 Supply and installation of miscellaneous metalwork Item 30,000 30,000 30,000

3.13 Concrete in tower base m3 100 300.00 30,000 100 300.00 30,000 100 300.00 30,000

3.14 Reinforcing bars in inlet tower base tonne 10 2,205.00 22,050 10 2,205.00 22,050 10 2,205.00 22,050 SUB TOTAL 362,669 373,894 431,019

4 Inlet Tower Construction

4.1 Concrete in inlet tower m3 475 550.00 261,250 713 550.00 391,875 950 550.00 522,500

4.2 Inlet tower bridge Item 500,000 500,000 500,000 Date 30-Sep-05 BORUMBA DAM - YABBA CREEK Revision A

AMTD 31.1 KM OPTION 3A: RCC, FSL =157.5m OPTION 4A: RCC, FSL =170.49m OPTION 5A: RCC, FSL = 192.14m

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

4.3 Reinforcing bars in inlet tower tonne 57 2,205.00 125,685 86 2,205.00 188,528 114 2,205.00 251,370

4.4 Supply and install precast closure stoplogs Item 15,000 15,000 15,000

4.5 Supply and install sitlration dropboards and guides Item 25,000 25,000 25,000

4.6 Supply and install handrails on inlet tower Item 5,000 5,000 5,000

4.7 Supply and install miscellaneous metalwork Item 70,000 70,000 70,000

4.8 Supply and install drop inlet bulkhead gate Item 5,000 5,000 5,000

4.9 Supply and install storage baulks, trashracks, guides, storage rack and lifting frame Item 35,000 35,000 35,000

4.10 Supply and install inlet tower monorail Item 5,000 5,000 5,000

4.11 Supply and install electrical items Item 20,000 20,000 20,000

4.12 Supply and install hoist Item 40,000 40,000 40,000

4.13 Supply and install water level recorder Item 70,000 70,000 70,000 SUB TOTAL 1,176,935 1,370,403 1,563,870

5 Mechanical and Electrical Installation

5.1 Construction of Valve House, Dissipator Chamber, and Retaining Walls (Includes pipes, specials and metalwork) Item 200,000 200,000 200,000

5.2 Supply and install valves and operation gear Item 650,000 650,000 650,000

5.3 Supply and install electrical items Item 90,000 90,000 90,000

5.4 Supply and install townwater pumps / motors Item 30,000 30,000 30,000

5.5 Supply and install flowmeter and recorder, sump pump, & hoist Item 70,000 70,000 70,000 SUB TOTAL 1,040,000 1,040,000 1,040,000

6 Dam Embankment Foundation Construction

6.1 Strip dam foundation m3 127,683 7.00 893,781 172,005 7.00 1,204,033 216,736 7.00 1,517,151

6.2 Dewatering foundation Item 50,000 50,000 50,000

6.3 Excavation for dam (a) Rock m3 5,000 44.00 220,000 10,000 44.00 440,000 15,000 44.00 660,000

6.4 Clean off under dam m2 21,000 6.00 126,000 35,000 6.00 210,000 52,500 6.00 315,000

6.5 Dental concrete m3 10,500 330.00 3,465,000 17,500 330.00 5,775,000 26,250 330.00 8,662,500

6.6 Drill grout holes m 14,000 30.00 420,000 18,667 30.00 560,000 35,000 30.00 1,050,000

6.7 Hook ups No 933 300.00 280,000 933 300.00 280,000 933 300.00 280,000

6.8 Grout bag 14,000 25.00 350,000 18,667 25.00 466,667 35,000 25.00 875,000 SUB TOTAL 5,804,781 8,985,700 13,409,651

7 Roller Compacted Concrete Embankment Construction

7.1 Construct RCC Embankment m3 294338 125.00 36,792,276 582292 125.00 72,786,470 961843 125.00 120,230,413

7.2 Supply and install guard rails m 920 80.00 73,600 920 80.00 73,600 1080 80.00 86,400

7.3 Supply and install Instrumentation Item 320,000 320,000 320,000 SUB TOTAL 37,185,876 73,180,070 120,636,813

8 Spillway Construction

8.1 Concrete to ogee m3 3600 350.00 1,260,000 3600 350.00 1,260,000 3600 350.00 1,260,000 Date 30-Sep-05 BORUMBA DAM - YABBA CREEK Revision A

AMTD 31.1 KM OPTION 3A: RCC, FSL =157.5m OPTION 4A: RCC, FSL =170.49m OPTION 5A: RCC, FSL = 192.14m

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $

8.2 Concrete to dissipator m3 4500 560.00 2,520,000 4500 560.00 2,520,000 6000 560.00 3,360,000

8.3 Reinforcement tonne 405 2,205.00 893,025 405 2,205.00 893,025 480 2,205.00 1,058,400 SUB TOTAL 4,673,025 4,673,025 5,678,400

9 Miscellaneous

9.1 Miscellaneous steelwork to intake tower and valve house Item 150,000 150,000 150,000

9.2 Alterations to service utilities Item 250,000 250,000 250,000 SUB TOTAL 400,000 400,000 400,000

TOTAL CAPITAL CONTRACT COST 62,987,343 111,080,473 176,711,319

10 Unestimated Items

10.1 Unestimated Items Contingency (15% of Captial Cost) Item 9,448,101 16,662,071 26,506,698 SUB TOTAL 9,448,101 16,662,071 26,506,698

TOTAL CONTRACT COST 72,435,444 127,742,544 203,218,017

11 Indirect Costs

11.1 General Contingency (30% Contract Cost) Item 21,730,633 38,322,763 60,965,405

11.2 Investigation, Design and Construction Supervision (15% of Contract Cost) Item 10,865,317 19,161,382 30,482,702

11.3 Owners Costs (10 % of Contract Cost + Indirect Costs) Item 10,503,139 18,522,669 29,466,612 SUB TOTAL 43,099,089 76,006,814 120,914,720

TOTAL CAPITAL COSTOPTION 3A 115,534,534 OPTION 4A 203,749,358 OPTION 5A 324,132,736