Raising Wappa Dam

3.9.1 General Wappa Dam is located on the South Maroochy River at AMTD 32.1 km, approximately 6.5 km upstream of its confluence with the North Maroochy River. The mean annual rainfall for the catchment is approximately 1700 mm. It has a catchment area of 72.4 km2 (Reference 23). The dam was constructed in 1961 and has a capacity of 4,610 ML at the current full supply level of EL 44.8m. Wappa Dam is operated in conjunction with Cooloolabin Dam, the Intake Weir for Image Flat Water Treatment Plant and Poona Dam.

Table 3.9.1 General Parameters of Wappa Dam

Feature Description

Name of Project Wappa Dam

Other Names N/A

Catchment Maroochy River

Stream South Maroochy River

Location (AMTD) 32.1 km

Location (Latitude / Longitude) 26°34’11” S / 152°55’20” E (Map Grid of Australia (MGA), Zone 56. Datum = GDA94)

Location (Easting / Northing) 7061223 / 0492258 (Map Grid of Australia (MGA), Zone 56. Datum = GDA94)

Local Government Area Maroochy Shire Council

Catchment Area Approximately 72.4 km2

Dam Types Considered Concrete Gravity Dam

Current Full Supply Level 44.8m

Current Capacity 4,610 ML

3.9.2 Storage Capacity The storage capacity curves for Wappa Dam are as shown in Figure 3.9.1 and Figure 3.9.2.

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The storage curve data was derived from DPI Water Resources Drawing A3-101494 which in turn was derived from 1:10,000 Orthophoto maps 9444-112,113 and 114 with contour intervals of 5m.

The current full supply level is EL 44.8m (Maroochy Shire Council) and the storage volume is 4,615 ML.

Figure 3.9.1 Wappa Dam: Storage Capacity Curve

Wappa Dam Raise - Storage Capacity Curve

110 100 90 80 70 60 50 40 Water Level (m) Level Water 30 20 0 50,000 100,000 150,000 200,000 250,000 300,000 Storage Volume (ML)

41/14840/334061 South East Queensland Regional Water Supply Strategy BSI04, Part 3 389 Wappa Dam Raise AMTD 32.1 km

Figure 3.9.2 Wappa Dam: Storage Area Curve

Wappa Dam Raise - Storage Area Curve

110

100 90

80 70

Water Level (m) 40

30 20 0 200 400 600 800 1,000 1,200 Storage Area (ha)

3.9.3 Potential Additional Supply The yield estimates indicated in Table 3.9.2 and Figure 3.9.3 were derived by NRM&W in November 2005.

The yield analyses assume that the Poona Dam, Intake Weir, Cooloolabin Dam and Wappa Dam are operated as a system with:

Cooloolabin Dam supplying water to Intake Weir via Low Creek at 13 ML/d maximum capacity;

Intake Weir supplies water to Poona Dam at 13 ML/d maximum capacity;

Wappa Dam supplies water to Poona Dam at 15.5 ML/d maximum capacity;

Poona Dam is topped up from Intake Weir to keep it full;

Intake Weir is topped up from Cooloolabin Dam when Poona Dam falls 0.75m below full (555 ML) limited to 13 ML/d maximum release; and,

If Poona Dam falls below 550 ML (1.0 m below full supply level) water is released from Wappa Dam (maximum release 15.5 ML/d).

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Table 3.9.2 Estimated Storage Characteristics

Full Supply Level Storage Capacity Surface area Yield EL (m) (ML) (ha) ML/a

27.0 0 0 0

44.8 4,615 69 3,900

50.9 10,000 105 7,400

70.0 50,000 335 23,500

81.1 100,000 566 34,000

95.0 200,000 916 43,000

Above upper limit of storage curve 500,000 N/A 57,000

Figure 3.9.3 Wappa Dam: Yield/Storage Relationship

Wappa Dam Raise - Yield / Storage Relationship

60,000

50,000

40,000

30,000

20,000

10,000

Historical No Failure Yield (ML/a) Yield No Failure Historical 0 0 100,000 200,000 300,000 400,000 500,000 600,000 Storage Volume (ML)

Notes

1. These yields are preliminary estimates of historical no-failure yield and do not include consideration of environmental flow requirements. 2. NRM&W have advised that environmental flow considerations are likely to severely impact on the upper level of development at this site, perhaps limiting yield to around 16,000 ML/a.

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3.9.4 Geology and Geotechnical A geotechnical appraisal for raising Wappa Dam was carried out in 1994 by the Department of Primary Industries (Reference 18). The following relates to that memorandum. Previous geotechnical investigations have comprised mapping, 3 exploration shafts, and drilling 6 boreholes in 1958 and boreholes, test pits and seismic refraction surveys in 1982 / 83. The existing dam has been constructed across an east trending incised valley of the South Maroochy River. The dominant geological unit is the North Arm Volcanics of Late Triassic Age. In the area, they consist of rhyolitic lava flows, rhyolitic tuffs and ignimbrites, volcanic breccia and agglomerate.

The main feature of the geology of is a north-south trending belt of rhyolite. The rhyolite underlies the existing dam and extends downstream to below Wappa Falls. The rhyolite is interbedded within a sequence of volcanic breccia, tuff and ignimbrite. The regional dip of the beds is 20 to 30 degrees towards the west.

The rhyolite at the damsite is jointed with defect spacings ranging from 30 mm to 2m. On the left bank, the rock is generally high strength apart from a sheared zone and cavernous zone at the base of the rhyolite.

The right bank has a distinctly altered and weathered zone in the rhyolite and at the breccia rhyolite interface, which may be up over 20m thick. This rock is unsuitable for founding a concrete structure and it was noted in the memorandum that conventional grouting techniques would be unsuccessful.

The weathered zone of the right bank is likely to inhibit the raise of the dam at this location.

No geological or geotechnical investigations have been undertaken at the downstream sites.

3.9.5 Natural Environment

3.9.5.1 Wappa Falls Wappa Falls are downstream of the existing dam wall and a proposal to build a new dam wall either 750m or 900m downstream would affect Wappa Falls. Wappa Falls is a sightseeing destination.

3.9.5.2 Vegetation Two tributary streams to the existing storage contain vegetation communities that are endangered including riparian rainforests, which would be inundated by the development (Reference 19). In addition, environment and vegetation mapping shows that large sections of ‘of concern’ ecosystems would be inundated. In addition, the rare and endangered rainforest shrub Triunia robusta occurs within rainforest habitat immediately downstream of the dam wall and is one of only four known populations. Under the Queensland Nature Conservation Act, a conservation

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plan for the management of this species would be required. This plan would need to include determination of species distribution, possible threats to all populations, and development of a conservation management strategy for the species and its habitat (Reference 19).

3.9.5.3 Wildlife No rare or threatened species of fauna are listed on the RATS1 database according to the Reference 19 (1992), however, the area of inundation is noted to contain important habitat and wildlife corridors. Significant species likely to occur in the forest areas include squirrel gliders (Petauroides norfolcensis), greater gliders (Petauroides volans), sooty owl (Tyto tenebricosa) and powerful owl (Ninox strenua) (Reference 19).

3.9.5.4 River Although South Maroochy River is generally in a degraded state, the tributary in- stream habitats were considered to be of good quality and may contain platypus, frog and reptile species and freshwater crayfish (Reference 10).

Downstream of the damsite, the Maroochy River has numerous estuarine ecosystems, which would be affected by further reduction in the flow by raising Wappa Dam.

3.9.6 Social and Recreation An estimate was made from 1991 Census data, that between 30 and 140 people would be affected by the development. Up to date information was not available, however, due to significant growth of the Sunshine Coast region, this estimate may be notably higher (Reference 23).

Recreation at Wappa Dam is limited to picnic facilities at the dam wall and although not used for water-based activities, provides a semi-natural resource. Whilst the impact of the development on these recreational activities is not expected to be great, it is largely unknown (Reference 23).

3.9.6.1 Infrastructure The proposed raising would inundate several roads in the area such as Cooloolabin Road, Wappa Falls Road, Kiama Road and local access roads.

A pipeline from the pump station immediately downstream of the dam wall to Poona Dam would be affected by all raising options. North of Cooloolabin Road, the Sunshine Coast Pistol Club is located at the junction of Kiamba Road. It is likely that the proposed raising of Wappa Dam would inundate this facility, and that this site is classified as a contaminated site.

1 RATS = Rare and Threatened Species Database previously maintained by the Australian Government, Department of Environment and Heritage.

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3.9.7 Cultural / Heritage A search of the heritage databases listed in Section 2 of this report indicates that there are no heritage sites impacted by this proposed project. Information reviewed suggests that an archaeological survey has not been undertaken to date. Therefore, cultural or heritages values are not known.

3.9.8 Strategic Land Use Planning The Wappa Dam is located solely in the Maroochy Shire and although in 1992, the zoning in the affected area was Rural A with an Extractive Industry Zone (Maroochy Shire hard rock quarry) and a Special Purposes Zone (Maroochy Shire water treatment plant), no current strategic planning information was located for the site. Cadastral information suggests that several rural residential areas would be affected by the ponded area, and in the southern section, FSL’s of EL90.0 and above would impact on a residential area of Nambour.

Also, two parcels of land, part of which would be inundated, or affected by the buffer zone, are zoned ‘Forest Reserve’. These parcels are Mapleton Forest Reserve (1239AP6278) and Maroochy Forest Reserve (368AR6281). 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.

The impact of this on the proposed development is not fully understood at this time.

3.9.8.1 SEQ Regional Plan A search of the SEQ Regional Plan mapping indicates that the area for the proposed Wappa Dam raising is currently categorised “Regional Landscape and Rural Production Area”.

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

3.9.9 Forestry Large areas of privately owned and State Forest native bushland would be affected by the development, however, it does not appear that production forestry is conducted in the area.

3.9.10 Conservation The Maroochy Shire Plan states that “The conservation values of areas of remnant vegetation within this precinct are significant and are intended to contribute to an environmental corridor extending between the Mapleton State Forest and the Maroochy River to the east.” Land use mapping shows that areas of ‘nature conservation’ would be affected by the development as per Section 3.9.7.

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3.9.11 Extractive Industry Land use mapping shows that the buffer zone affects a significant portion of land used for ‘mining’. It is believed that this section is the Maroochy Shire hard rock quarry mentioned previously.

3.9.12 Agriculture Land use mapping shows that the land is generally used for perennial horticulture, grazing of natural vegetation, and intensive animal production. The agricultural land capacity map shows that large tracts of land affected by the development are ‘Class A – crop land’.

3.9.13 Primary Limitation on Storage Capacity Two populations of Triunia Robusta have been identified at Wappa Dam. The loss of the population below Wappa Dam would decrease the known number of individuals of Triunia robusta by 26%. The transplanting of plants at the Wappa dam is a possibility, however, little is known about the biology of the species (Reference 11).

For reservoir levels exceeding about EL 70m a saddle dam would be required north of the reservoir across the Yandina-Cooloolabin Road east of the pistol range.

To the south a reservoir full supply level of EL 90m would extend back to near Nambour. For maximum flood levels in the storage approaching EL 90m, a saddle or a saddle dam would be required along a short section of Savelle Road Nambour. Image Flat Road would require a bridge and long abutment construction.

Upgrade works undertaken at the dam in 1999 to improve access to the intake tower indicated that the hearting concrete may be very weak. In addition a geotechnical assessment of the damsite in 1994 indicated that the foundations on the right abutment comprise distinctly weathered rhyolite to depths of over 20m.

The existing damsite topography and geology is considered poor in the context of requirements for raising the dam above its current level. Two sites have been identified previously by DPI about 750m and 900m downstream of the existing dam (Reference 11). The cost of a dam 900m downstream of the existing dam was comparable to the cost of raising the existing dam and it was found that it would likely result in the least cost raising option. For this cost study the cost of a dam 900m downstream of the existing dam was adopted. However, in consideration of the impact of the downstream site on the Triunia Robusta, further consideration of the site location would be required before any development at this site could be progressed. A dam constructed at a site 900m downstream of the existing dam would have greater storage capacity than a raised dam at the existing site for a given storage level. For the purpose of this report, the existing storage curve has been adopted, and the storage capacity will thus be an underestimate at the downstream site.

The impact of the Forest Reserves should be investigated in future studies.

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3.9.14 Project Capital Cost The project capital cost includes:

1. Dam construction cost; 2. Land acquisition costs; 3. Relocation of roads; 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.

3.9.14.1 Estimated Cost of Dam Construction Due to unsuitable topographical conditions at the existing site for raising, cost estimates were completed for the existing dam raise to a FSL of 77.5 only and a new dam to various FSL’s located approximately 900m downstream of the existing.

Due to limited information available at the new site, the storage characteristics and yield estimates for the existing site was assumed to be applicable to the new site for the purposes of completing the cost estimates.

RCC dam construction costs were derived for a site 900m downstream of the existing dam and the 1993 costs developed for raising the existing dam to a full supply level of EL77.5m were updated to 2005 costs. The results of these estimates are indicated in Figure 3.9.4.

A spillway width of 80m was assumed for all options and crest levels were estimated assuming a peak outflow for the PMF of 1,840 m3/s as reported by NRM&W in October 1993 (Reference 11). For the purposes of these cost estimates, it has been assumed that materials for the construction of the dam embankment would be available.

Survey information available (Reference 11) is at a scale of 1:5,000 with 2m contour intervals, however, the accuracy and source of this survey was not indicated.

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.

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Figure 3.9.4 Wappa Dam: Estimated Construction Cost

Wappa Dam Raise - Yield / Dam Cost Relationship

$250,000,000 FSL 85.0m

$225,000,000

$200,000,000 FSL 77.5m

$175,000,000

$150,000,000

$125,000,000 FSL 55.0m $100,000,000

$75,000,000 Raise Existing Earthfill and Rockfill Dam

$50,000,000 FSL 44.8m New Roller Compacted Concrete Dam $25,000,000 900m Downstream

Estimated Capital Cost of Dam ($) Dam of Cost Capital Estimated $0 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 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.

3.9.14.2 Estimated Cost of Land Acquisitions The cost of land acquisition was assessed by multiplying the required area by typical land sale values in the area ($10,000 per ha) plus an assessment of the value buildings including, the rate of $350,000 for older houses and $500,000 for newer houses.

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 for the existing full supply level. The area within this buffer zone was obtained from GIS2 datasets using contour information provided by NRM&W.

No determination of the impacts of a flood margin has been considered, though it is anticipated that any additional land required beyond the 200m buffer zone, would not be significant.

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;

2 GIS = Geographical Information Systems

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

Retention of unsaleable portions of properties outside the buffer zone. The estimated costs of land acquisitions in 2005 are summarised in Table 3.9.3.

Table 3.9.3 Summary of Land Acquisition Cost Estimate

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

44.8 0 0.0 0.0 0.0

55.0 293 25.5 12.7 38.2

77.5 870 39.7 19.9 59.6

85.0 1,147 51.0 25.5 76.5

The land acquisition costs are a significant proportion of the total cost and therefore should be evaluated to a similar level of detail as that used to cost the dams. This may be undertaken for the next phase of the work, should investigation of this option be further progressed.

In addition, a compensatory package would need to be negotiated with EPA in respect of areas of Forest Reserve required, though no allowance has been made in this estimate above the assumed cost per ha for the purchase of land required.

3.9.14.3 Road Works and Relocation Several local roads would be affected by the raising of Wappa Dam. These include Image Flat Road, Kiamba Road, Cooloolabin Road, and some minor gravel roads. Most of the works required relate to the reconstruction of bridges for flood clearance.

Previous cost estimates were done internally by the DPI Water Resources group in 1993 and an escalation factor has been multiplied to those original estimates. The results of which are listed in Table 3.9.4.

3.9.14.4 Telecommunications The cost of telecommunications works and relocations is minimal. Nevertheless, an escalation rate has been applied to the costs listed in 1993 (Reference 18).

3.9.14.5 Electricity Distribution The cost of electrical distribution works and relocations is minimal. An escalation rate has been applied to the costs listed in 1993 (Reference 18).

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3.9.14.6 Shire Facilities Minor shire facilities are expected to be affected, such as gravel roads and access tracks. The cost of these facilities was escalated from 1993 to 2005.

An allowance of $2 million was included in the cost estimate for relocating the pipeline from Wappa Dam to Poona Dam. The cost of relocating the hard rock quarry has not been included in the estimate, although normal land acquisition costs are estimated.

3.9.14.7 Overall Estimate of Cost The estimated cost for the Wappa Dam raising as well as cost per ML yield and marginal cost per ML is indicated in Table 3.9.4.

The unit costs of water and the marginal cost of water for the Wappa Dam raise for various full supply levels are indicated in Figure 3.9.5.

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 estimates do not include consideration of operational or distribution costs.

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Table 3.9.4 Wappa Dam Raise: Estimated Cost Summary

FSL (m) Raising of RCC Land Roads $M Telecom Electricity Shire Relocation TOTAL Unit Marginal existing construction Acquisitions distribution facilities of Pipeline Capital Cost Cost of cost of dam cost site 900m $M Water Yield downstream of $M $M $M $M $M $M existing dam $/ML/a $/ML/a $M

44.8 60.8 0.0

55 88.3 38.2 3.5 0.2 0.3 0.4 2.0 132.9 11,307

77.5 167.1 158.2 59.6 8.0 0.6 0.3 0.4 2.0 238.0 7,932 5,759

85.0 231.0 76.5 12.0 0.75 0.3 0.4 2.0 323.0 8,996 14,414

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Figure 3.9.5 Wappa Dam Raise: Estimated Dam Cost/Yield Relationship

Wappa Dam Raise: Project Capital Cost / Yield Comparison 12,000 16,000

14,000 10,000

12,000

8,000 10,000

6,000 8,000 ($/ML/a) ($/ML/a) 6,000 4,000

4,000 Unit Capital Cost of Water

2,000 Unit Cost of Water (left axis) Marginal Capital Cost of Water 2,000 Marginal cost of water (right axis)

0 0 0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 Storage Volume (ML)

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3.9.15 Investigations Proposed to Ensure the Viability of Raising Wapp Dam A number of key factors with a potential to jeopardise the viability of raising Wappa Dam have been identified. Further and more detailed investigation of those factors is recommended as summarised below in Table 3.9.5.

Table 3.9.5 Proposed Investigations to Ensure Viability of Cedar Grove Damsite

Investigation Tasks Included Comments Proposed

Geotechnical Require a seismic refraction Investigation survey along the proposed new downstream dam axis. + Two drill holes with locations dependant on findings of seismic survey. + Undertake normal range of tests dependent on material type found. + Comment on appropriate structure types for foundations. + Assess if there is sufficient material present to construct preferred dam type.

Natural Search appropriate registers or Endangered fauna environment - databases to ascertain if there species, rainforests, vegetation, wildlife, are any known species of wildlife, and river species river conservation significance in the likely. proposed inundation area and buffer zone. Investigate impact of development on endangered flora species Triunia Robusta.

Natural Investigate the impact of the environment - Mapleton and Maroochy Forest vegetation, wildlife, Reserves on the project. river

Cultural heritage - Search appropriate registers or Indigenous and databases to ascertain if there European are listings at locations within the proposed inundation area and buffer zone.

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Investigation Tasks Included Comments Proposed

Social environment Assess number of residents Growth may have - residents within the proposed inundation occurred since initial area and buffer zone and analysis. Potential produce a demographic profile political issues should be based on the latest available assessed by the census data. government. Assess number of residences in the project area.

3.9.16 Figures 3.9.6 to 3.9.22 Figure 3.9.6 Locality Plan

Figure 3.9.7 Dam Wall Location

Figure 3.9.8 Satellite and Cadastral Plan

Figure 3.9.9 General Geological Plan

Figure 3.9.10 Geological Plan (Not Available)

Figure 3.9.11 Seismic Cross Sections (Not Available)

Figure 3.9.12 Land Use Plan

Figure 3.9.13 Zoning and Strategic Plans (Not Available)

Figure 3.9.14 Environmental and Vegetation Plan

Figure 3.9.15 Agricultural Value Classification Plan

Figure 3.9.16 Typical Earth and Rockfill Dam General Arrangement

Figure 3.9.17 Typical Saddle Dam General Arrangement

Figure 3.9.18 Typical Earth and Rockfill Dam Cross Section

Figure 3.9.19 Typical Earth and Rockfill Dam Spillway Long Section Figure 3.9.20 Typical Section of Outlet Works (Not Available)

Figure 3.9.21 Typical Roller Compacted Concrete General Arrangement

Figure 3.9.22 Typical Roller Compacted Concrete Cross Section

41/14840/334061 South East Queensland Regional Water Supply Strategy BSI04, Part 3 403 Wappa Dam Raise AMTD 32.1 km !

NOOSA SHIRE

Eumundi !

Yandina ! Wappa Dam Stage II Maroochy River Maro (! oc hy Ri ver

MAROOCHY SHIRE

Nambour !

O b i O bi cr eek

Woombye !

! Gympie Palmwoods !

CALOUNDRA CITY Caboolture ! Eudlo !

Brisbane !

South East Queensland Legend Regional Wate Supply Strategy (! Potential Dam / Weir Site Highway Major Road ² ! Towns Wappa Dam Raising 0 1,000 2,000 3,000 4,000 Source: GIS data supplied by Lakes Geoscience Australia, NRM&W River South Maroochy River AMTD 32.1km Projection: MGA Zone 56 Meters Date Printed: 15 August 2005 Local Government Area File: M:\41\14840\gis\maps\ Creek locality_a4\wappa_locality_rev_b.mxd 1:150,000 Size: A4 Figure 3.9.6 40

8 10 0 0 2 0

80 0 4

1 0 0 80 8

2 0

0 6

0 1

6 0

6 0 0 4 1

FLOW 0 4 1

2 DIRECTION

6 0 0 2 20

0 40 2 8 0 60 40 Wappa Dam Raising 60

80 1 0 0

12 0 0 1 6

0 140

1 4 160

1 1 0 0 0 0 2 2 2 0

180 0 2 8 1 200 0

0 0 0 8 0 2 1 2 4

2 1 80 60 0

0 6

8 1

South East Queensland Legend Regional Water Supply Strategy ! Towns River Highway ² Wappa Dam Raising South Maroochy River AMTD 32.1km 0 100 200 300 400 Source: GIS data supplied by Geoscience Australia, NRM&W Proposed Damwall Creek Major Road Projection: MGA Zone 56 Meters Date Printed: 15 August 2005 Dam Wall Location File: M:\41\14840\gis\maps\ 20m Contour Cadastre damwall_a4\wappa_damwall_rev_b.mxd 1:15,000 Size: A4 Figure 3.9.7 Yandina !

South East Queensland Legend Regional Water Supply Strategy

! Inundation Area Towns Highway Wappa Dam Raising FSL - 90.0m ² South Maroochy River AMTD 32.1km Proposed Damwall Major Road Source: GIS data supplied by 0 300 600 900 1,200 Geoscience Australia, NRM&W Cadastre Projection: MGA Zone 56 Date Printed: 15 August 2005 River 200m Buffer Meters Satellite and Cadastral Plan File: M:\41\14840\gis\maps\ satellite\wappa_satellite_rev_b.mxd 1:35,000 Size: A3 Creek Figure 3.9.8

! Reference Cadastral Boundary

)) NRM Registered Bore 706200070620007062000 Street Road COOLOOLABINCOOLOOLABIN COOLOOLABINCOOLOOLABIN Main Road Highway/Motorway RmcRmc River Suburb Boundary 706150070615007061500 Dam Embankment (Not to Scale) YANDINAYANDINA ½½ Fault RmdRmd Water Body KIAMBAKIAMBA WAPPAWAPPA RmwRmw Qa • Quaternary ½ Alluvium: Clay, silt, sand, gravel; flood plain alluvium Rmw • Late Triassic Wappa Rhyolite: Felsites (Felsic Lavas, Clastics 706100070610007061000 & High Level Intrusives); Rhyolite Rmd • Late Triassic Dunethin Rhyolite: Felsites (Felsic Lavas, Clastics & High Level Intrusives); Dacite Rmc & Rmc/u • Late Triassic Carol Creek Rhyolite: Felsites (Felsic Lavas, Rmc/uRmc/u Clastics & High Level Intrusives); Rhyolitic tuff (Breccia) Rmi • Late Triassic 706050070605007060500 Ninderry Rhyolite: Felsites (Felsic Lavas, Clastics 491000 491000 491000 491500 491500 491500 492000 492000 492000 492500 492500 492500 493000 493000 493000 491000 491000 491000 491500 491500 491500 492000 492000 492000 492500 492500 492500 493000 493000 493000 491000 491000 491000 491500 491500 491500 492000 492000 492000 492500 492500 492500 493000 493000 493000 & High Level Intrusives); Rhyolitic RmiRmi Rmp • Late Triassic Perwillowen Rhyolite: Felsites (Felsic Lavas, RmpRmp Clastics & High Level Intrusives); Rhyolitic tuff Wappa 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•9•9 M:/41/14840/GIS/Wappa Geology

! South East Queensland Legend Regional Water Supply Strategy ! Towns Grazing natural vegetation Intensive animal production Other minimal use Proposed Damwall Cropping Lake Residential River Irrigated cropping Reservoir/dam Manufacturing and industrial Wappa Dam Raising Creek Perennial horticulture River Mining ² South Maroochy River AMTD 32.1km Highway Irrigated perennial horticulture Nature conservation Services Source: GIS data supplied by 0 260 520 780 1,040 Major Road Seasonal horticulture Marsh/wetland Transport and communication Geoscience Australia, NRM&W Projection: MGA Zone 56 200m Buffer Irrigated seasonal horticulture Production forestry Utilities Meters Land Use Plan Date Printed: 15 August 2005 Inundation Area Intensive horticulture Plantation forestry Waste treatment and disposal File: M:\41\14840\gis\maps\ FSL - 90.0m landuse_a4\wappa_landuse_rev_b.mxd 1:40,000 Size: A4 Figure 3.9.12 South East Queensland Regional Water Supply Strategy

Wappa Dam Raising South Maroochy River AMTD 32.1km

Zoning and Strategic Plans

Figure 3.9.13

ble aila Av ata D ² o 0 300 600 900 1,200 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\wappa_zoning.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.

Legend South East Queensland Regional Water Supply Strategy ! Towns Highway Regional Ecosystem Proposed Damwall Major Road Endangered (Dominant) Wappa Dam Raising River 200m Buffer Endangered (Sub-Dominant) ² South Maroochy River AMTD 32.1km Source: GIS data supplied by 0 250 500 750 1,000 Geoscience Australia, NRM&W Creek Inundation Area Of Concern (Dominant) Projection: MGA Zone 56 FSL - 90.0m Meters Environmental and Vegetation Plan Date Printed: 15 August 2005 Of Concern (Sub-Dominant) File: M:\41\14840\gis\maps\environment_a4 \wappa_environment_rev_b.mxd Not Of Concern 1:40,000 Size: A4 Figure 3.9.14 !

! South East Queensland Legend Regional Water Supply Strategy ! Towns Highway Good Quality Agricultural Land (GQAL) Proposed Damwall Major Road Class A - Crop land Wappa Dam Raising River 200m Buffer Class B - Limited crop land ² South Maroochy River AMTD 32.1km 0 250 500 750 1,000 Source: GIS data supplied by Creek Inundation Area Class C1 - Pasture land Geoscience Australia, NRM&W FSL - 90.0m Projection: MGA Zone 56 Class C2 - Pasture land Meters Agricultural Land Capacity Plan Date Printed: 15 August 2005 File: M:\41\14840\gis\maps\gqal_a4\ wappa_gqal_rev_b.mxd Class D - Non-agricultural land 1:40,000 Size: A4 Figure 3.9.15

3.9.17 Cost Estimates The cost estimates for Wappa Dam are contained in the following pages.

These estimates include the raising the existing dam to a FSL of 77.5m and roller compacted concrete embankment options for FSL’s of 44.8m, 55.0m, 77.5m and 85.0m.

41/14840/334061 South East Queensland Regional Water Supply Strategy BSI04, Part 3 421 Wappa Dam Raise AMTD 32.1 km Date 26-Oct-05 WAPPA DAM RAISING - SOUTH MAROOCHY RIVER Revision A

AMTD 32.1 KM OPTION 1: FSL 77.5m BSI04: PART 3, DESK TOP REVIEW OF IDENTIFIED DAM AND WEIR SITES Dam Crest Level = EL ???m PRE-FEASIBILITY COST ESTIMATE FOR DAM AND APPURTENANT WORKS Spillway Width = 150m

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $

1 Project Establishment and Controls 1.1 Mobilisation of plant and equipment Item 500,000 1.2 Establishment, Temporary Works and Site Facilities Item 10.0% 16,753,000 1.3 Insurance costs Item 1.7% 2,848,000 1.4 Liason and Approvals Item 0.2% 335,000 1.5 Preparation and Implementation of QA and Work Place Health and Safety and other Management Plans Item 1.0% 1,675,000 1.6 Standards, Monitoring and Implementation of Environmental and Safety Management Item 3.0% 5,026,000 1.7 Preparation of Drawings, Survey and Operations Manuals Item 0.5% 838,000 1.8 Demobilisation of plant and equipment Item 350,000 SUB TOTAL 28,325,000 2 Preliminaries 2.1 Clearing of Ponded Areas ha 201 1,500.00 301,500 2.2 Public Amenities Item 1,000,000 2.3 Access Roads Item 620,000 SUB TOTAL 1,921,500 3 Diversion Works 3.1 Coffer Dam Item 91,000 3.2 Supply and install RC box culvert diversion conduit m 95 5,000.00 475,000 3.3 Conduit closure - fill conduit and grout m3 209 380.00 79,420 3.4 Excavate for conduit below foundation rock m3 143 44.00 6,292 SUB TOTAL 651,712 4 Outlet Works 4.1 Drill holes supplied and grout earthing bars m 18 85.00 1,530 4.2 Backfill Concrete m3 293 260.00 76,180 4.3 Conduit Concrete m3 270 530.00 143,100 4.4 Reinforcing bars and conduit tonne 22 2,205.00 48,510 4.5 Supply and install MS pipes and specials for conduit (includes low flow line and dewatering / filling line) Item 78,300 4.6 Supply and installation of miscellaneous metalwork Item 26,400 4.7 Supply and install drop inlet bulkhead and seating frame Item 5,000 SUB TOTAL 379,020 5 Inlet Tower Construction 5.1 Concrete in inlet tower m3 411 550.00 226,050 5.2 Reinforcing bars in inlet tower tonne 51 2,205.00 112,455 5.3 Supply and install precast closure stoplogs Item 15,000 5.4 Supply and install sitlration dropboards and guides Item 25,000 5.5 Supply and install handrails on inlet tower Item 5,000 5.6 Supply and install miscellaneous metalwork Item 75,000

Page 1 of 7 Date 26-Oct-05 WAPPA DAM RAISING - SOUTH MAROOCHY RIVER Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ 5.7 Supply and install drop inlet bulkhead gate Item 5,000 5.8 Supply and install storage baulks, trashracks, guides, storage rack and lifting frame Item 35,000 5.9 Supply and install inlet tower monorail Item 5,000 5.10 Supply and install electrical items Item 20,000 5.11 Supply and install hoist Item 40,000 5.12 Supply and install water level recorder Item 15,000 SUB TOTAL 578,505 6 Mechanical and Electrical Installation 6.1 Construction of Valve House, Dissipator Chamber, and Retaining Walls (Includes pipes, specials and metalwork) Item 680,000 6.2 Supply and install valves and operation gear Item 650,000 6.3 Supply and install electrical items Item 85,000 6.4 Supply and install townwater pumps / motors Item 30,000 6.5 Supply and install flowmeter and recorder, sump pump, & hoist Item 70,000 SUB TOTAL 1,515,000 7 Dam Embankment Foundation Construction 7.1 Strip dam foundation 7.1.1 Under earth and rockfill embankment m3 184,234 7.00 1,289,638 7.1.2 Additional for core set down m3 85,703 7.00 599,921 7.1.3 Under RCC spillway m3 20,982 7.00 146,874 7.1.4 Under RCC Left bank dam wall m3 20,782 7.00 145,474 7.1.5 Under RCC right bank training / retaining wall m3 35,510 7.00 248,570 7.2 Rock excavation for spillway / right bank training wall m3 45,008 25.00 1,125,200 7.3 Dewatering foundation Item 120,000 7.4 Clean off foundation 7.4.1 Under core m3 10,840 6.00 65,040 7.4.2 Under RCC Spillway m3 14,388 6.00 86,328 7.4.3 Under RCC Left bank dam wall m3 4,623 6.00 27,738 7.4.4 Under RCC right bank training / retaining wall m3 2,917 6.00 17,502 7.5 Dental concrete 7.5.1 Under core m3 108 330.00 35,640 7.5.2 Under RCC Spillway m3 144 330.00 47,520 7.5.3 Under RCC Left bank dam wall m3 46 330.00 15,180 7.5.4 Under RCC right bank training / retaining wall m3 29 330.00 9,570 7.6 Base Concrete 7.6.2 Under RCC Spillway m3 719 260.00 186,940 7.6.3 Under RCC Left bank dam wall m3 231 260.00 60,060 7.6.4 Under RCC right bank training / retaining wall m3 146 260.00 37,960

Page 2 of 7 Date 26-Oct-05 WAPPA DAM RAISING - SOUTH MAROOCHY RIVER Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ 7.7 Slurry cut-off trench under clay core right bank m3 1,500 180.00 270,000 7.8 Grouting foundation (spillway and left bank RCC) 7.8 Drill grout holes m 18,854 30.00 565,620 7.8 Standpipes each 760 41.00 31,160 7.8 Hook ups No 1,771 300.00 531,300 7.8 Grout bag 13,198 25.00 329,950 SUB TOTAL 5,993,185 8 Earth and Rockfill Embankment Construction 8.1 Win, place and compact Zone 1 m3 152,008 9.00 1,368,072 8.2 Win, place and compact Zone 2A coarse filter m3 43,780 45.00 1,970,100 8.3 Win, place and compact Zone 2B fine filter m3 18,407 50.00 920,350 8.4 Win, place and compact blanket drain Zone 2C m3 14,125 50.00 706,250 8.5 Place and compact Zone 3A and 3B (ex quarry) m3 585,138 13.00 7,606,794 8.6 Place and compact Zone 4A rip rap (ex quarry) m3 44,047 34.00 1,497,598 8.7 Place and compact Zone 4A (Rock facing - ex quarry) m3 38,100 34.00 1,295,400 8.8 Place and compact Zone 4C (ex quarry m3 26,019 50.00 1,300,950 8.9 Backfill around structures m3 300 20.00 6,000 8.10 Road pavement m3 1,396 50.00 69,800 8.11 Supply and install guard rails m 1,580 80.00 126,400 8.12 Supply and install Instrumentation Item 250,000 SUB TOTAL 17,117,714 9 RCC Structures 9.1 Concrete to spillway (RCC excluding facing concrete) m3 130,306 109.00 14,203,354 9.2 Concrete to left bank dam wall (RCC exluding facing concrete) m3 47,682 109.00 5,197,338 9.3 Concrete to right bank training / retaining wall (RCC excluding facing concrete) m3 43,885 109.00 4,783,465 9.5 Bedding concrete between RCC layers m2 144,217 5.00 721,085 9.6 Dissipator / training wall RCC conventional concrete m 3,835 582.00 2,231,970 9.7 Reinforcement - conventional concrete sections tonne 230 2,205.00 507,150 9.8 Drilling holes for anchor bars and grouting bars in place m 7,095 45.00 319,275 9.9 Drilling holes for drainage through RCC and foundation m 1,735 87.00 150,945 9.10 Supply and install 300 mm waterstops m 263 386.00 101,518 9.11 Construct control joints in RCC m2 3,750 40.00 150,000 9.12 Metalwork (guardrails) m 860 146.00 125,560 SUB TOTAL 28,491,660 10 Processing of concrete / RCC aggregate 10.1 Excavation in quarry m3 163,340 9.00 1,470,060 10.2 Crush m3 208,349 15.00 3,125,235 SUB TOTAL 4,595,295

Page 3 of 7 Date 26-Oct-05 WAPPA DAM RAISING - SOUTH MAROOCHY RIVER Revision A

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ 11 Saddle Dam 11.1 Strip saddle dam foundation m2 7,979 8.00 63,832 11.2 Win, place & compact blanket and chimney drain Zone 2 m3 4,852 40.00 194,080 11.3 Win, place and compact Zone 3 m3 50,602 13.00 657,826 11.4 Win, place and compact Zone 4a, 4b, 4c m3 13,864 33.00 457,512 11.5 Road pavement m3 621 87.00 54,027 11.6 Supply & install guard rails m 690 146.00 100,740 SUB TOTAL 1,528,017 12 Temporary Relocation of Pump Station 12.1 Construct temporary pump station and modify main Item 95,000 SUB TOTAL 95,000

TOTAL CAPITAL CONTRACT COST 91,096,608 13 Unestimated Items 13.1 Unestimated Items Contingency (15% of Capital Contract Cost) Item 13,664,491 SUB TOTAL 13,664,491

TOTAL CONTRACT COST 104,761,099 14 Indirect Costs 14.1 General Contingency (30% Contract Cost) Item 31,428,330 14.2 Investigation, Design and Construction Supervision (15% of Contract Cost) Item 15,714,165 14.3 Owners Costs (10 % of Contract Cost + Indirect Costs) Item 15,190,359 SUB TOTAL 62,332,854

TOTAL CAPITAL COSTOption 1C 167,093,953

Page 4 of 7 Date 07-Oct-05 Revision A

Flood peak PMF 1,840 m3/s Flood peak PMF 1,840 m3/s Flood peak PMF 1,840 m3/s Flood peak PMF 1,840 m3/s OPTION 4A: FSL 44.8 m OPTION 4B: FSL 55.0 m3/s OPTION 4C: FSL 77.5 m3/s OPTION 4C: FSL 85.0 m3/s

WAPPA DAM - SOUTH MAROOCHY RIVER Dam Crest Level = 49.7 m Dam Crest Level = 60 m Dam Crest Level = 82.4 m Dam Crest Level = 89.9 m

AMTD 31.2 KM About 900m downstream of existing dam Saddle dam crest lev 51.7 m Saddle dam crest le 61.9 m Saddle dam crest le84.4 m Saddle dam crest lev91.9 m BSI04: PART 3, DESK TOP REVIEW OF IDENTIFIED DAM AND WEIR SITES Spillway Width = 80 m Spillway Width = 80 m Spillway Width = 80 Spillway Width = 80 PRE-FEASIBILITY COST ESTIMATE FOR DAM AND APPURTENANT WORKS Flood Rise = 4.9 m Flood Rise = 5 m Flood Rise = 5 m Flood Rise = 5 m

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

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

1.2 Establishment, Temporary Works and Site Facilities Item 10.0% 3,200,000 10.0% 4,681,000 10.0% 8,565,000 10.0% 12,972,000 1.3 Insurance costs Item 1.7% 544,000 1.7% 796,000 1.7% 1,456,000 1.7% 2,205,000

1.4 Liason and Approvals Item 0.2% 64,000 0.2% 94,000 0.2% 171,000 0.2% 259,000

1.5 Preparation and Implementation of QA and Work Place Health and Safety and other Management Plans Item 1.0% 320,000 1.0% 468,000 1.0% 856,000 1.0% 1,297,000 1.6 Standards, Monitoring and Implementation of Environmental and Safety Management Item 3.0% 960,000 3.0% 1,404,000 3.0% 2,569,000 3.0% 3,892,000 1.7 Preparation of Drawings, Survey and Operations Manuals Item 0.5% 160,000 0.5% 234,000 0.5% 428,000 0.5% 649,000 1.8 Demobilisation of plant and equipment Item 350,000 350,000 350,000 350,000 SUB TOTAL 6,098,000 8,527,000 14,895,000 22,124,000

2 Preliminaries 2.1 Clearing of Ponded Areas ha 338 1,500.00 507,000 394 1,500.00 591,000 458 1,500.00 687,000 578 1,500.00 867,435

2.2 Public Amenities Item 1,000,000 1,000,000 1,000,000 1,000,000

2.3 Access Roads Item 600,000 600,000 600,000 600,000 SUB TOTAL 2,107,000 2,191,000 2,287,000 2,467,435

3 Diversion and Care of Stream 3.1 Diversion and Care of Stream (including cofferdam) Item 400,000 400,000 400,000 400,000 3.2 Excavation of Inlet / Outlet Channel (a) Rock m3 700 44.00 30,800 930 44.00 40,920 1005 44.00 44,220 1005 44.00 44,220 3.3 Excavation of Inlet / Outlet Channel (b) Weathered Rock and Soil m3 1660 20.00 33,200 2206 20.00 44,120 2390 20.00 47,800 2390 20.00 47,800

3.4 Excavation of Conduit (a) Rock m3 1307 44.00 57,508 1435 44.00 63,140 1527 44.00 67,188 1527 44.00 67,188 3.5 Excavation of Inlet Tower (a) Rock m3 710 44.00 31,240 710 44.00 31,240 710 44.00 31,240 710 44.00 31,240 3.6 Drilll holes supplied and grout anchor bars (Conduit at base of Tower) m 540 85.00 45,900 540 85.00 45,900 540 85.00 45,900 540 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 18 315.00 5,670 3.8 Backfill Concrete m3 220 260.00 57,200 220 260.00 57,200 220 260.00 57,200 220 260.00 57,200

3.9 Conduit Concrete m3 587 530.00 311,242 641 530.00 339,862 682 530.00 361,327 764 530.00 404,809

3.10 Reinforcing bars and conduit tonne 70.47 2,205.00 155,386 76.95 2,205.00 169,675 81.81 2,205.00 180,391 91.65 2,205.00 202,099

3.11 Supply and install MS pipes and specials for conduit (includes low flow line and dewatering / filling line) Item 135,000 135,000 135,000 135,000

3.13 Conduit closure Item 50,000 50,000 50,000 50,000 3.14 Supply and installation of miscellaneous metalwork Item 30,000 30,000 30,000 30,000

3.15 Concrete in tower base m3 800 300.00 240,000 850 300.00 255,000 890 300.00 267,000 890 300.00 267,000 3.16 Reinforcing bars in inlet tower base tonne 80 2,205.00 176,400 85 2,205.00 187,425 89 2,205.00 196,245 89 2,205.00 196,245 SUB TOTAL 1,759,547 1,855,152 1,919,181 1,984,371

4 Inlet Tower Construction

4.1 Concrete in inlet tower m3 210 550.00 115,500 233 550.00 128,150 251 550.00 138,050 251 550.00 138,050 4.2 Inlet tower bridge Item 4.3 Reinforcing bars in inlet tower tonne 26 2,205.00 57,330 28 2,205.00 61,961 30 2,205.00 66,591 30 2,205.00 66,591

4.4 Supply and install precast closure stoplogs Item 15,000 15,000 15,000 15,000 4.5 Supply and install sitlration dropboards and guides Item 25,000 25,000 25,000 25,000

4.6 Supply and install handrails on inlet tower Item 5,000 5,000 5,000 5,000 4.7 Supply and install miscellaneous metalwork Item 65,000 65,000 65,000 65,000

4.8 Supply and install drop inlet bulkhead gate Item 5,000 5,000 5,000 5,000 4.9 Supply and install storage baulks, trashracks, guides, storage rack and lifting frame Item 30,000 30,000 30,000 30,000

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

Page 5 of 7 Date 07-Oct-05 Revision A

WAPPA DAM - SOUTH MAROOCHY RIVER Dam Crest Level = 49.7 m Dam Crest Level = 60 m Dam Crest Level = 82.4 m Dam Crest Level = 89.9 m

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ 4.11 Supply and install electrical items Item 20,000 20,000 20,000 20,000

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

4.13 Supply and install water level recorder Item 70,000 70,000 70,000 70,000 SUB TOTAL 452,830 470,111 484,641 484,641

5 Valve House and Mechanical and Electrical Installation 5.1 Construction of Valve House, Dissipator Chamber, and Retaining Walls (Includes pipes, specials and metalwork) Item 1,000,000 1,000,000 1,000,000 1,000,000

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

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

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

5.5 Supply and install flowmeter and recorder, sump pump, & hoist Item 70,000 70,000 70,000 70,000 SUB TOTAL 1,840,000 1,840,000 1,840,000 1,840,000

6 Dam Embankment Foundation Construction 6.1 Strip dam foundation m3 49321 7.00 345,249 67435 7.00 472,043 104442 7.00 731,095 133157 7.00 932,098 6.2 Dewatering foundation Item 120,000 120,000 120,000 120,000

6.3 Excavation for dam (a) Rock m3 2,466 44.00 108,507 3,372 44.00 148,356 5,222 44.00 229,773 6,658 44.00 292,945 6.4 Clean off under dam m2 10,000 6.00 60,000 16,000 6.00 96,000 22,500 6.00 135,000 22,500 6.00 135,000 6.5 Dental concrete m3 2,466 330.00 813,801 3,372 330.00 1,112,672 5,222 330.00 1,723,296 6,658 330.00 2,197,088 6.6 Drill grout holes m 13,500 30.00 405,000 13,500 30.00 405,000 13,500 30.00 405,000 13,500 30.00 405,000

6.7 Hook ups No 1,350 300.00 405,000 1,067 300.00 320,100 1,200 300.00 360,000 1,200 300.00 360,000

6.8 Grout bag 13,500 25.00 337,500 13,500 25.00 337,500 13,500 25.00 337,500 13,500 25.00 337,500 SUB TOTAL 2,595,057 3,011,671 4,041,664 4,779,630

7 Roller Compacted Concrete Embankment Construction 7.1 Construct RCC Embankment m3 126897 125.00 15,862,166 218543 125.00 27,317,937 459355 125.00 57,419,385 704420 125.00 88,052,498 7.11 Supply and install guard rails m 1350 80.00 108,000 2060 80.00 164,800 2175 80.00 174,000 2175 80.00 174,000 7.13 Supply and install Instrumentation Item 320,000 320,000 320,000 320,000 SUB TOTAL 16,290,166 27,802,737 57,913,385 88,546,498

7 Saddle Dam Construction

7.1 Win, place and compact Earthfill m3 - 9.00 0 - 9.00 0 68,081 9.00 612,730 466,487 9.00 4,198,379 7.2 Win, place and compact Chimney drain/filter m3 - 40.00 0 - 40.00 0 2,061 40.00 82,440 8,893 40.00 355,731 Win, place and compact blanket drain/filter m3 - 40.00 0 - 40.00 0 4,637 40.00 185,490 20,010 40.00 800,396 7.4 Win, place and compact Rip Rap m3 - 33.00 0 - 33.00 0 7,249 33.00 239,209 25,878 33.00 853,981 7.8 Excavation m3 - 7.00 0 - 7.00 0 37,300 7.00 261,100 116,878 7.00 818,145 SUB TOTAL 0 0 1,380,969 7,026,632

8 Spillway Construction 8.1 Concrete to ogee m3 1600 350.00 560,000 1600 350.00 560,000 1600 350.00 560,000 1600 350.00 560,000 8.2 Concrete to dissipator m3 1275 560.00 714,000 1912.5 560.00 1,071,000 2550 560.00 1,428,000 3825 560.00 2,142,000 8.5 Reinforcement m3 144 2,205.00 316,969 176 2,205.00 387,253 208 2,205.00 457,538 271 2,205.00 598,106 SUB TOTAL 1,590,969 2,018,253 2,445,538 3,300,106

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

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

SUB TOTALCONTRACT COST 33,133,569 48,115,924 86,226,409 125,926,682

Page 6 of 7 Date 07-Oct-05 Revision A

WAPPA DAM - SOUTH MAROOCHY RIVER Dam Crest Level = 49.7 m Dam Crest Level = 60 m Dam Crest Level = 82.4 m Dam Crest Level = 89.9 m

ITEM DESCRIPTION UNIT QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ QUANTITY RATE TOTAL $ 10 Unestimated Items 10.1 Unestimated Items Contingency (15% of Captial Cost) Item 4,970,035 7,217,389 12,933,961 18,889,002 SUB TOTAL 4,970,035 7,217,389 12,933,961 18,889,002

TOTAL CONTRACT COST 38,103,604 55,333,312 99,160,370 144,815,684 11 Indirect Costs 11.1 General Contingency (30% Contract Cost) Item 11,431,081 16,599,994 29,748,111 43,444,705

11.2 Investigation, Design and Construction Supervision (15% of Contract Cost) Item 5,715,541 8,299,997 14,874,056 21,722,353 11.3 Owners Costs (10 % of Contract Cost + Indirect Costs) Item 5,525,023 8,023,330 14,378,254 20,998,274 SUB TOTAL 22,671,644 32,923,321 59,000,420 86,165,332

TOTAL CAPITAL COSTOption 1A 60,775,248 Option 2A 88,256,633 Option 3A 158,160,791 Option 3A 230,981,017

Page 7 of 7