Infrastructure Cost Estimates 24102008

8/8/2019 Infrastructure Cost Estimates 24102008

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Mudgeeraba to Tugun network upgrade

To reinforce and ensure a

dependable electricity supply

to the rapidly growing southern

Gold Coast, ENERGEX is

proposing to build a 110kVpowerline from Mudgeeraba

to a new substation at Tugun.

PurposeThe following report outlines thepreliminary and additional cost estimatesfor the proposed ENERGEX Mudgeerabato Tugun network upgrade project.

The cost estimates have been preparedfor the community to better consider thenancial diffncs btwn difcultroute assumptions.

ScenariosThe following scenarios havebeen prepared:

1. Uou powerlineconstruction from Mudgeeraba(Varsity Lakes Transit OrientatedDevelopment) to Tugun (13 km)

2. O powerline constructionfrom Mudgeeraba (Varsity LakesTransit Orientated Development)to Tugun (13 km)

3. Uou powerlineconstruction from Tallebudgera CreekRoad, Tallebudgera to DuringanRoad, Currumbin. (Originally releasedin discussion with key stakeholdersJune 2008) (4.5 km)

4. O powerline constructionfor the comparative section referredto in scenario 3 utilising the sameoverhead route adopted in scenario 1

5. Uou powerlineconstruction from the Elanora Water Treatment Plant (North of AlmondCourt, Elanora) to ENERGEX’sCurrumbin Substation, Station Street,Currumbin Waters

6. O powerline construction for

the comparative section referred to inscenario 5 utilising the same overheadroute adopted in scenario 1.

Base Assumptions• Ttal ut lngth cnsidd f th

cost estimates have excluded thesection traversing the Varsity LakesTransit Orientated Development, asthis is being separately developed.The length of this section isapproximately 1.2 km. The totallength between the respective

substations is approximately 14.2 km

• Gnal cnstuctin stimats abased on actual costs of recentlycompleted 110kV undergroundprojects within the ENERGEX area

• N ld suvy data cllctinhas been undertaken to identifyany spcic cnstuctin issus

and general assumptions have beenassumed consistently across thelength of the project

• Undgund cnstuctin typicallyinvolves considerable uncertaintyover the entire length of the corridor.Overhead construction can havesimilar uncertainty at just the polelocations but this would involvea much smaller land area. Riskassessments in the estimates haveaccounted for this difference

• Us f th jint cid f th

installation of underground cables

Infrastructure Cost Estimates Report

Typical cable cross section for 110kV underground powerline



has additional risks. These includestructural damage during transportconstruction, derating of the cable dueto additional soil cover, and relocationf th lin du t nal dsign changsby other infrastructure projects sharingthe corridor

• Undgund cnstuctin quishigh isk tchniqus t tavs thcks and th bstacls. Difcultis

have been experienced in underboringlarge creeks, which has resulted insignicant cst vuns

• N ppty acquisitin csts hav bnconsidered in any of the scenarios

• N appval csts csts f consultation have been considered inthe cost summaries, as these would becommon to all options

• N vgtatin wks hav bnconsidered in these cost estimates i.e:

• Landscaping / vgtatin

• Pvisin f vgtatin ffsts asoutlined in the Memorandum of Undstanding with th Dpatmntof Natural Resources and Water

• Pvisin / cntibutins f anyfauna corridors

• N dtaild glgical infmatinwas usd f cnsidatin f spcicconstruction impacts i.e:

• Acid Sulphat sils

• Cntaminatd lands

• N additinal csts hav bnconsidered for relocation of other utilityinfrastructure

• N csts hav bn includd f cnnctin / augmntatin at thsubstation for Mudgeeraba, Currumbinor Tugun, as this would be commonto all options

• N ail spcic cnstuctinaugmentation methods havebeen considered in the undergroundcost estimates.

Route Descriptions

Scio 1 – Mub to TuuUndergrOUnd solutio

The underground route has utilised theexisting overhead (scenario 2) routeas a basis with some minor amendmentsas outlined below:

a) Oyster Creek Drive to TallebudgeraCreek Road – the undergroundinghas followed closely with a proposedservice road rather than the foot of thenew motorway

b) Rees Court to K P McGrath Drive,Elanora – the underground route hascrossed under the motorway further south to avoid vegetation clearing

c) Sarawak Avenue to Station Street –the underground route has crossedunder the motorway at Sarawak Avenue,then underbored across CurrumbinCreek and progressed along StationRoad to minimise vegetation impacts

d) John Flynn Hospital to TugunSubstation – the underground routedeviates from the overhead corridor,adopting a more direct route to the

Tugun Substation.

Note: The same corridor has been adopted for

the section relevant for Scenario 5

(Refer to maps 1 and 2 – Pink line is Underground)

Scio 2 – Mub to TuuOverhead solutio

The overhead route cost estimate is basedon current publicly released informationand represents a corridor length of 13 km.

(Refer to maps 1 and 2 – Yellow line is Overhead)

Scio 3 – Tllbu Ck

to Cuumbi CkUndergrOUnd solutio

(Released previously in June 2008 through

discussions with key stakeholders and

community reference group)

The underground section of this routefollows the motorway along the easternside of the corridor from the northern endof Tallebudgera Creek to the southern endof Currumbin Creek. The remainder of theroute follows the existing overhead route.

(Refer to maps 1 and 2 – Purple line is Underground)

Scio 4 – Tllbu Ckto Cuumbi Ck Overheadsolutio

(Released previously in June 2008 through

discussions with key stakeholders and

community reference group)

Follows the existing overhead corridor

(Refer to maps 1 and 2 – Yellow line is Overhead)

Scio 5 – elo Wt Ttmt Plt to CuumbiSubsttio UndergrOUnd

solutio

This underground route utilises the existingoverhead route as a basis with some minor amendments asoutlined below:

a) Rees Court to K P McGrath Drive,Elanora – the underground route hascrossed under the motorway further south to avoid vegetation clearing, and

b) Sarawak Avenue to Station Street –the underground route has crossedunder the motorway at SarawakAvenue, then under bored across

Currumbin Creek and progressedalong Station Road to minimisevegetation impacts.

(Refer to maps 1 and 2 – Green line is Underground)

Scio 6 – elo Wt Ttmt Plt to CuumbiSubsttio Overhead solutio

This route follows the existing overhead corridor.

(Refer to Map 2 – Yellow line is Overhead)



Total Cost Estimate Comparisons Scenario Length Cost ($M)

1 Mudgeeraba to Tugun UNDerGroUND solution 13.0 km (*) $83

2 Mudgeeraba to Tugun OVERHEAD solution 13.0 km (*) $20

3 Tallebudgera Creek to Currumbin Creek UNDerGroUND solution 4.5 km (#) $32

4 Tallebudgera Creek to Currumbin Creek OVERHEAD solution 4.5 km (#) $7

5 Elanora Water Treatment Plant to Currumbin Substation UNDerGroUND solution 4.4 km $28

6 Elanora Water Treatment Plant to Currumbin Substation OVERHEAD solution 4.4 km $7

Note: Please refer to the assumptions when considering the estimates above i.e: these gures do not include property acquisition costs, cost of approvals,

revegetation / landscaping costs, relocation of other utilities, infrastructure, consultation etc. (*)These estimates do not include 1.2 km Varsity Lakes Transit

Orientated Development section. (#) Originally released in discussion with key stakeholders, June 2008.

Overhead Structure• 22-25 m tall cnct pls

• Dubl cicuit 110kV pw lin

• ovhad and undslung ath wi

(Refer to maps 1 and 2 for location of the different scenarios)

50 to 75mm ASPHALT

COMPACTED LEAN

MIX CONCRETE

FLOWABLE FILL

CABLE PROTECTION

COVER STRIPS

NOT TO SCALE

TYPE: 110-E CONDUITS

SURFACE: PAVED CABLE

BEDDING: FTB

BACKFILL: FTB/LEANMIX

650

100(NOM)

1400

A P P R O X 1 4 0 0

9 0 0 ( N O M

) 3 0 0

1 0 0 ( M A X

)

1 0 0 ( M I N )

1 5 0

7 5 ( N O M )

Reasonable consistant

Straight, neat cut on edges

FINISHED SURFACE LEVEL

ELECTRICAL

WARNING TAPES

100(NOM)

110kV trench cross-section

Underground Construction• Cnduit and cabl cnstuctin

• Und b f iv cssings and mtway sctins

• Dubl cicuit 110kV power lines

• XLPe insulatd cabl

• Jinting Pits appximatly 800m apat



Route Categorised Costs

Scio 1Mub to Tuu UndergrOUnd solutioPowerline cables $29M

Civil construction $33M

Mechanical Installation $10M

Project engineering $11M

Total Costs $83M

Scio 2Mub to Tuu Overhead solutioPowerline cables $1M




Total Costs $20M

Scio 3

Tllbu Ck to Cuumbi Ck UndergrOUnd solutioPowerline cables $9M




Total Costs $32M

Scio 4Tllbu Ck to Cuumbi Ck Overhead solutioPowerline cables $0.4M

Civil construction $4.2M

Mechanical Installation $0.7M

Project engineering $1.7MTotal Costs $7M

Scio 5elo Wt Ttmt Pltto Cuumbi Substtio UndergrOUnd solutioPowerline cables $8M




Total Costs $28M

Scio 6elo Wt Ttmt Pltto Cuumbi Substtio Overhead solutioPowerline cables $0.4M

Civil construction $4.2M

Mechanical Installation $0.7M

Project engineering $1.7M

Total Costs $7M



Powli cbls

• Maj itms includ all cablingquid f cnducts, athingand communications.

Ciil costuctio

• Maj itms includ all civil wksfor overhead structures andunderground trenches. Includespreparation, poles, excavation,backll and mval f spil. Includspvisin f plant, quipmnt andresources associated with the civilconstruction. Includes provisions for normally expected risks associatedwith such works. Excludes accesstacks, claing and -vgtatinbased remediation.

Mcicl Istlltio

• Major items include for overhead,conductor stringing and attachmentand for underground, all pullingof cables and jointing. Includespvisin f plant, quipmnt and

resources associated with themechanical construction.

Pojct ii

• Major items include planning,design, procurement, stakeholder communication and generalpjct cdinatin /administatin.Includes job factors, fees and costof capital provisions.

Cost Category Interpretation

Typical overhead cable

how to mk submissioso t Ifstuctu Costestimts rpot

• Must b in witing

• Plas includ th hading‘Infrastructure Cost EstimatesReport’

• Must hav nam and addss

• Signd by ach psn whhas made the submission

• Must be received by 5pmFriday 21 November.

W to s you submissioEmail:[email protected]

Mail:ENERGEX - Maunsell Reply Paid 1823

Milton BC QLD 4064If yu hav any futh qustins,please call us on our free callnumber 1800 025 158 or email us atthe address given above.For more information visitthe ENERGEX website onwww.energex.com.au/network

vsity Lks Uou

Queensland Transport (QT) is planning

to utilise land around the VarsityLakes Railway station as a Transport

Orientated Development (TOD). This willincorporate residential and commercial

development. As part of the planning

for this development QT has engagedENERGEX to undertake feasibility and

design work to underground a 1.2km

section of the existing Mudgeeraba toBurleigh 110kV overhead powerline

located in an easement alongside

Scottsdale Drive Varsity Lakes. Since

this corridor is also proposed to be used

for the Mudgeeraba to Tugun networkupgrade, the feasibility and design work

includes provision for undergrounding the

new powerline and other future 33kV and

11kV circuits.

In accordance with strict legislative and

plicy quimnts, this wk is bing

undertaken on a fully cost recoverable

basis fm th qusting paty, QT.

QT have not yet agreed to fund the

construction phase of this work as it

is subject to their approval after the

design estimates are complete. Should

this undergrounding work not proceed,ENERGEX proposes to install the

Mudgeeraba to Tugun powerline

as overhead construction in its

existing easement.

Cnsquntly f th pups f

costing comparisons of the Mudgeeraba

to Tugun network upgrade, this section

has been excluded from the study as

the outcome will be same for all the

considered options.

Existing 110kV overhead power lines

at Pacic Pines



1.

2.

Legend

Proposed Road

Proposed Rail

Proposed 110kV Line

Scenario 1

Scenario 3

Scenario 5

Scenario 2,4,6

Legend

Proposed Road

Proposed Rail

Proposed 110kV Line

Scenario 1

Scenario 3

Scenario 5

Scenario 2,4,6

Infrastructure Cost Estimates 24102008

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