Nageb Al-Malah NA To: Fax: General Manager, Government Information & Privacy Branch [Multiple recipients] CC:

30 April 2012 Adam Berry Date:From: Project Development Manager Southern Development Burrill Lake Bridge planning Subject:

MEMO In 2010 RMS commissioned Aurecon to assist in a high-level review of the future options available in relation to Burrill Lake bridge. The Strategic Concept and Options Study Burrill Lake Bridge report outlines a number of potential future options, how they were identified and the major constraints/potential impacts of each. The review examined engineering issues related to: • Reinforcing the deteriorating concrete columns. • Adding new, additional concrete columns. • Replacing the 55 metre bridge between the causeway and the southern bank of the lake. • Building a new 200 metre long bridge on a new alignment.

While the Strategic Concept and Options Study made a specific recommendation to RMS as a way forward, RMS will identify environmental constraints, examine technical issues in greater detail and seek feedback from stakeholders and undertake a value engineering/options assessment exercise prior to finalising a preferred option.

Adam Berry Project Development Manager Southern Development

Memo Page 1

INDICATIVE ROAD LAYOUT PLAN - OPTION 4B

9 00PRELIMINARYAPPROVED DESIGN QA RECORDS

PREPARED

DRAWING

DESIGN

REGISTRATION No OF PLANSCHECKED

DIRECTOR SHEET No ISSUE

ROADS AND TRAFFIC AUTHORITY OF NSW

CAD No.

ISSUE STATUS:

RTA BRIDGE NUMBER

202984-DW-BR009

DATEISSUE REVISION PREP CHK AUTH

PRINCES HIGHWAY SHIRE OF SHOALHAVEN

STRATEGIC CONCEPT AND OPTIONS STUDY

Email: sydney@ap.aurecongroup.com+61 2 9465 5598+61 2 9465 5599ABN 54 005 139 873 Telephone:

Facsimile:116 Military Road (PO Box 538) Neutral BayNew South Wales 2089 Australia

Aurecon Australia Pty Ltd

FACSIMILE (02) 4227 3705TELEPHONE 131 782

WOLLONGONG NSW 2500LEVEL 4, 90 CROWN STREET

CLIENT

ROADS AND TRAFFIC AUTHORITY OF NSWWOLLONGONG REGIONAL OFFICE

PO BOX 477, WOLLONGONG 2500

Scott Cullum's review

BURRILL LAKE BRIDGE - OPTION 2DETAILED COST ESTIMATE

Pay Item Description of work Quantity Unit Rate Amount

1.1 Site Establishment 1.1.1 establish site compound 1 Item $25,000.00 $ 25,000.00 1.1.2 establish barge and barge hire 1 item $140,000.00 $ 140,000.00

1.2 Temporary Realignment of exisiting Ultilites 1 item $80,000.00 $ 80,000.00

1.3 Pile strengthening and cofferdam system to facilitate

-

1.3a Labour - cleaning piles, coring for shear studs, install forms and tieing steel all underwater, pouring tremmie concrete (4 weeks per pier)

20 week $25,000.00 $ 500,000.00

1.3b steel fabrication for formwork sleeves, 1.2m diameter in half, 10m long x 7 piles x 2 sets

2 set $50,000.00 $ 100,000.00

1.3c Tremmie concrete 1m3 per 1m of piles 350 m3 $325.00 $ 113,750.00 1.3d Misc material, anchors steel reo etc 1 item $50,000.00 $ 50,000.00 1.3e markup (contractor & RTA direct control) 1 item $135,650.00 $ 135,650.00

Sub-Total: $1,144,400.00

2.1 Management 1 Item $60,000.00 $60,000.002.2 Traffic Management (Construction Phase) 2 Item $30,000.00 $30,000.002.3 Structural Verifcation of Design 1 Item $35,000.00 $35,000.002.4 Site Inspection 1 Item $20,000.00 $20,000.002.5 No. 6 x Site Office / Site Amenities 20 wks $145.00 $2,900.002.6 Community Consulation 1 Item $15,000.00 $15,000.002.7 Site Supervision 1 Item $26,666.66 $26,666.66

Sub-Total: $189,566.66

TOTAL AMOUNT (Excluding GST) $1,333,966.66

CONTINGENCY - 50% $666,983.33

OPTION 2 - GRAND TOTAL AMOUNT $2,000,950

$2,500,000.00

1.0 SUBSTRUCTURE STRENGTHENING

SUBSTRUCTURE STRENGTHENING

2.0 MISCELLANEOUS ITEMS

MISCELLANEOUS ITEMS

Scott Cullums Review

BURRILL LAKE BRIDGE - OPTION 3ADETAILED COST ESTIMATE

Pay Item Description of work Quantity Unit Rate Amount

Cast in situ headstocks1.1 Site Establishment and Temporary Works 1 Item $ 50,000.00 $ 50,000.00 1.1.2 establish barge and barge hire 1 item $ 165,000.00 $ 165,000.00 1.2 Temporary Realignment of exisiting Ultilites 1 item $ 100,000.00 $ 100,000.00 1.3 Installation work1.3a Piling (supply and driving) 1 item $ 150,000.00 $ 150,000.00 1.3b Labour - cleaning piles, install forms and tieing steel all underwater, pouring

tremmie concrete, strip forms, cut off and grout old piles (5 weeks per pier)25 week $ 25,000.00 $ 625,000.00

1.3c steel fabrication for formwork, 14.5m long 2.2m wide 1.2 m high x 2 sets 2 each $ 50,000.00 $ 100,000.00

1.3d Tremmie concrete 35m3 per pier 175 m3 $ 325.00 $ 56,875.00 1.3e Misc material, anchors steel reo etc 1 item $ 50,000.00 $ 50,000.00 1.3f stressing (establish, supply, stressing and grouting operations) 1 item $ 100,000.00 $ 100,000.00 1.3g markup (contractor & RTA direct control) 1 item $ 280,725.00 $ 280,725.00

Sub-Total: $1,677,600.00

2.1 Management 1 Item $ 150,000.00 $ 150,000.00 2.2 Traffic Management (Construction Phase) 1 Item $ 60,000.00 $ 60,000.00

2.3 Structural Verifcation of Design 1 Item $ 45,000.00 $ 45,000.00 2.4 Site Inspection 1 Item $ 20,000.00 $ 20,000.00 2.5 No. 6 x Site Office / Site Amenities 30 wks $ 145.00 $ 4,350.00 2.6 Community Consulation 1 Item $ 25,000.00 $ 25,000.00 2.7 Site Supervision 1 Item $ 60,000.00 $ 60,000.00

Sub-Total: $364,350.00

$2,041,950.00

$1,020,975.00

$3,062,925.00$3,500,000.00

BURRILL LAKE BRIDGE - OPTION 3BDETAILED COST ESTIMATE

Pay Item Description of work Quantity Unit Rate Amount

No.5 x Pre-Cast Headstock and Piles1.1 Site Establishment 1 Item $ 50,000.00 $ 50,000.00 1.1.2 establish barge and barge hire 1 item $140,000.00 $ 140,000.00 1.2 Temporary Realignment of exisiting Ultilites 1 item $ 100,000.00 $ 100,000.00 1.3 Installation work $ - 1.3a Piling (supply and driving) 1 item $ 150,000.00 $ 150,000.00 1.3b Labour - cleaning piles, install headstocks, install rms and tieing steel all

underwater, pouring tremmie concrete, strip forms, cut off and grout old piles (4 weeks per pier)

20 week $ 25,000.00 $ 500,000.00

1.3c steel fabrication for formwork, 14.5m long 2.2m wide 1.2 m high x 2 sets 2 each $ 50,000.00 $ 100,000.00

1.3 Supply and delivery of precast headstocks (25t each) 10 each $ 15,000.00 $ 150,000.00 1.3d Tremmie concrete 10m3 per pier 50 m3 $ 325.00 $ 16,250.00 1.3e Misc material, anchors steel reo etc 1 item $ 50,000.00 $ 50,000.00 1.3f stressing (establish, supply, stressing and grouting operations) 1 item $ 100,000.00 $ 100,000.00 1.3g markup (contractor & RTA direct control) 1 item $ 249,350.00 $ 249,350.00

Sub-Total: $1,605,600.00

2.1 Management 1 Item $ 150,000.00 $ 150,000.00

CONTINGENCY - 50%

OPTION 3A - GRAND TOTAL AMOUNT

1.0 SUBSTRUCTURE STRENGTHENING

SUBSTRUCTURE STRENGTHENING

TOTAL AMOUNT (Excluding GST)

2.0 MISCELLANEOUS ITEMS

MISCELLANEOUS ITEMS

1.0 SUBSTRUCTURE STRENGTHENING

SUBSTRUCTURE STRENGTHENING

2.0 MISCELLANEOUS ITEMS

2.2 Traffic Management (Construction Phase) 1 Item $ 60,000.00 $ 60,000.00 2.3 Structural Verifcation of Design 1 Item $ 45,000.00 $ 45,000.00 2.4 Site Inspection 1 Item $ 20,000.00 $ 20,000.00 2.5 No. 6 x Site Office / Site Amenities 25 wks $ 145.00 $ 3,625.00 2.6 Community Consulation 1 Item $ 25,000.00 $ 25,000.00 2.7 Site Supervision 1 Item $ 60,000.00 $ 60,000.00

Sub-Total: $363,625.00

$1,969,225.00

$984,612.50

$2,953,837.50$3,000,000.00

BURRILL LAKE BRIDGE - OPTION 3CDETAILED COST ESTIMATE

Pay Item Description of work Quantity Unit Rate Amount

No. 5 x Steel Truss Headstocks and Piles1.1 Site Establishment and Temporary Works (Including Cofferdam System) 1 Item $ 50,000.00 $ 50,000.00

1.1.2 establish barge and barge hire 1 item $ 115,000.00 $ 115,000.00 1.2 Temporary Realignment of exisiting Ultilites 1 item $ 100,000.00 $ 100,000.00 1.3 installation works1.3a Piling (supply and driving) 1 item $ 150,000.00 $ 150,000.00 1.3b Labour - cleaning piles, install headstocks and connections etc all

underwater, cut off and grout old piles (4 weeks per pier)15 week $ 25,000.00 $ 375,000.00

1.3c steel supply and fabrication13.c1 Top and Bottom Chord Members (310UC158) (Supply) 43.7 t $ 4,822.50 $ 210,743.25 13.c2 Web Members (250UC72.9) (Supply) 5.56 t $ 4,822.50 $ 26,813.10 13.c3 Diagonal Brace Memebers (250UC72.9) (Supply) 14.25 t $ 4,822.50 $ 68,720.63 13.c4 Headstock Support (75PFC5.9) (Supply) 0.058 t $ 4,822.50 $ 279.71 13.c5 Driven Piles (310UC158) 18m (Supply) 56.88 t $ 4,822.50 $ 274,303.80 13.c6 Medium Term Steel Protection - Galvanising (20 Yr Life) 120.448 t $ 1,000.00 $ 120,448.00 1.3d Misc material, anchors steel reo etc 1 item $ 50,000.00 $ 50,000.00 1.3e markup (contractor & RTA direct control) 1 item $ 248,957.02 $ 248,957.02

Sub-Total: $1,790,265.50

2.1 Management 1 Item $ 150,000.00 $ 150,000.00

2.2 Traffic Management (Construction Phase) 1 Item $ 60,000.00 $ 60,000.00 2.3 Structural Verifcation of Design 1 Item $ 45,000.00 $ 45,000.00 2.4 Site Inspection 1 Item $ 20,000.00 $ 20,000.00 2.5 No. 6 x Site Office / Site Amenities 15 wks $ 145.00 $ 2,175.00 2.6 Community Consulation 1 Item $ 25,000.00 $ 25,000.00 2.7 Site Supervision 1 Item $ 60,000.00 $ 60,000.00

Sub-Total: $362,175.00

$2,152,440.50

$1,076,220.25

$3,228,660.75$3,500,000.00

Notes:

1. All prices exclude GST2. This estimate has been derived from first principles using realistic durations and likely practical methods of construction. I have arrived at the rates above from my experience with similar works, the bridges location and site constraints works and these rates represent my best judgement as an experienced bridge maintenance engineer, familiar with the construction industry. Assumptions have been made where details were not present on the drawings.

TOTAL AMOUNT (Excluding GST)

CONTINGENCY - 50%

MISCELLANEOUS ITEMS

CONTINGENCY - 50%

OPTION 3C - GRAND TOTAL AMOUNT

OPTION 3B - GRAND TOTAL AMOUNT

1.0 SUBSTRUCTURE STRENGTHENING

SUBSTRUCTURE

TOTAL AMOUNT (Excluding GST)

2.0 MISCELLANEOUS ITEMS

MISCELLANEOUS ITEMS

BURRILL LAKE BRIDGE - OPTION 4ADETAILED COST ESTIMATE

Pay Item Description of work Quantity Unit Rate Amount

1.1 Demolition and removal of existing bridge 1 Item $800,000.00 $800,000.00

Sub-Total: $800,000.00

2.1 Mabey Bridge Installation and Hire and removal 1 Item $1,100,000.00 $1,100,000.002.3 Cofferdam System 1 Item $900,000.00 $900,000.002.4 Temporary Realignment of exisiting Ultilites 1 Item $500,000.00 $500,000.002.5 Temporary Road Approaches 1 Item $600,000.00 $600,000.00

Sub-Total: $3,100,000.00

3.1 No. 42 x Bored Piles 600dia 756 m $450.00 $340,200.003.3 No.6 x Headstocks 14200 x 900 x 1000 76.68 m3 $600.00 $46,008.00

3.4 Reinforcement 12 t $3,045.00 $36,540.003.5 No. 2 x Abutments 14200 x 1400 x 2000 79.52 m3 $600.00 $47,712.00

3.6 Reinforcement 12.5 t $3,045.00 $38,062.503.7 No. 8 x Bored Abutment Piles 18000 x 900dia 144 m3 $700.00 $100,800.00

3.8 Excavation and Backfill at Abutments 100 m3 $150.00 $15,000.00

3.9 Testing of Piles to relevant Specification 1 item $20,000.00 $20,000.00

Sub-Total: $644,322.50

4.1 200mm Thick Deck 12800 x 64050 164 m3 $400.00 $65,600.00

4.2 Reinforcement 25.748 t $3,045.00 $78,402.664.3 No.2 x Paraphets 970 high 64050 128.1 m $360.00 $46,116.004.4 No.1 x Pedestrian Guard Rail 64050 64.05 m $100.00 $6,405.00

Sub-Total: $196,523.66

5.1 Strip Bearings 12 Each $1,500.00 $18,000.00

Sub-Total: $18,000.00

6.1 PSC Girders 9.15 m long - Fabrication, Delivery and Erection (incl. Calcium Nitrate Addative)

112 Each $5,571.45 $624,002.40

Sub-Total: $624,002.40

7.1 Management 1 Item $250,000.00 $250,000.007.2 Traffic Management (Construction Phase) 2 Item $100,000.00 $200,000.00

7.3 Structural Verifcation of Design 1 Item $50,000.00 $50,000.007.4 Site Inspection 1 Item $20,000.00 $20,000.007.5 No. 6 x Site Office / Site Amenities 120 wks $200.00 $24,000.007.6 Community Consulation 1 Item $40,000.00 $40,000.007.7 Site Supervision 1 Item $75,000.00 $75,000.00

Sub-Total: $659,000.00

$6,041,848.56

$3,020,924.28

$9,062,772.84$9,500,000.00

Notes: Rate/Sqm $11,800.49

1. All prices exclude GST2. In preparing this cost estimate, Aurecon has arrived at the rates used on the basis of Aurecon's experience and recent market prices for similar works and these rates represent Aurecon's best judgement as an experienced and qualified professional engineering consultant, familiar with the construction industry. Aurecon has no control over the cost of resources furnished by others or over the Contractors' methods of determining prices or over competitive bidding or market conditions. Aurecon does not guarantee that proposals, bids or actual construction costs will not vary from Aurecon's estimates.

CONTINGENCY - 50%

GRAND TOTAL AMOUNT

1.0 DEMOLITION WORKS

DEMOLITION WORKS

2.0 TEMPORARY WORKS

TEMPORARY WORKS

3.0 SUBSTRUCTURE

SUBSTRUCTURE

4.0 SUPERSTRUCTURE

SUPERSTRUCTURE

TOTAL AMOUNT (Excluding GST)

5.0 BEARINGS

BEARINGS

6.0 GIRDERS

GIRDERS

7.0 MISCELLANEOUS ITEMS

MISCELLANEOUS ITEMS

BURRILL LAKE BRIDGE - OPTION 4BDETAILED COST ESTIMATE

Pay Item Description of work Quantity Unit Rate Amount

1.1 Detailed Geotechnical Investigation - Item $50,000.00 $50,000.00

1.2 Detailed Topograghic Survey - Item $50,000.00 $50,000.001.3 Detailed Engineering/verification - Item $100,000.00 $100,000.001.4 Detailed Hydrology Analysis - Item $50,000.00 $50,000.001.5 Land/Property Acquisition - Item $850,000.00 $850,000.001.6 Demolition of the existing bridge 1 Item $600,000.00 $600,000.00

Sub-Total: $1,700,000.00

2.1 Cofferdam System 1 Item $900,000.00 $900,000.002.2 Realignment of Utilities - Item $1,350,000.00 $1,350,000.00

Sub-Total: $2,250,000.00

3.1 No. 44 x Bored Piles 900 dia 792 m $500.00 $396,000.003.3 No.11 x Headstocks 12300 x 1000 x 1000 135.3 m3 $600.00 $81,180.00

3.4 Reinforcement 21.3 t $3,045.00 $64,858.503.5 No. 2 x Abutments 12300 x 1400 x 2000 68.88 m3 $600.00 $41,328.00

3.6 Reinforcement 10.8 t $3,045.00 $32,886.003.7 No. 8 x Bored Abutment Piles 18000 x 900dia 144 m $500.00 $72,000.003.8 Excavation and Backfill at Abutments 40 m3 $150.00 $6,000.00

3.9 Testing of Piles to relevant Specification - Item $20,000.00 $20,000.00

Sub-Total: $714,252.50

4.1 200mm Thick Deck 200 x 12.3 m 492 m3 $400.00 $196,800.00

4.2 Reinforcement 77.1 t $3,045.00 $234,769.504.3 No.2 x Paraphets 970 high 200m 400 m $360.00 $144,000.004.4 No.1 x Pedestrian Guard Rail 64.05m 200 m $100.00 $20,000.00

Sub-Total: $595,569.50

5.1 Strip Bearings 24 Each $1,500.00 $36,000.00

Sub-Total: $36,000.00

6.1 PSC Girders 16.7 m long - Fabrication, Delivery and Erection (incl. Calcium Nitrate Addative)

156 Each $13,062.50 $2,037,750.00

Sub-Total: $2,037,750.00

7.1 Pavement Including drainage, fill, compaction and pavement 1 Item $2,800,000.00 $2,800,000.007.2 Noise Walls - Item $50,000.00 $50,000.007.3 LV Lighting Within the Caravan Park Vicinity - Item $10,000.00 $10,000.00

Sub-Total: $2,860,000.00

8.1 Management 1 Item $250,000.00 $250,000.008.2 No. 6 x Site Office / Site Amenities 120 wks $200.00 $24,000.008.3 Community Consulation 1 Item $50,000.00 $50,000.008.4 Erosion Costs 1 Item $120,000.00 $120,000.008.5 Site Supervision 1 Item $125,000.00 $125,000.00

Sub-Total: $569,000.00

$10,762,572.00

$5,381,286.00

$16,143,858.00$16,500,000.00

Rate/Sqm $5,424.33

9.1 Removal of the causeway 1 Item $500,000.00 $500,000.00

Notes:1. All prices exclude GST2. In preparing this cost estimate, Aurecon has arrived at the rates used on the basis of Aurecon's experience and recent market prices for similar works and these rates represent Aurecon's best judgement as an experienced and qualified professional engineering consultant, familiar with the construction industry. Aurecon has no control over the cost of resources furnished by others or over the Contractors' methods of determining prices or over competitive bidding or market conditions. Aurecon does not guarantee that proposals, bids or actual construction costs will not vary from Aurecon's estimates.

9.0 PROVISIONAL ITEMS

CONTINGENCY - 50%

GRAND TOTAL AMOUNT

BEARINGS

6.0 GIRDERS

1.0 INVESTIGATION WORKS

2.0 INVESTIGATION WORKS

3.0 SUBSTRUCTURE

SUBSTRUCTURE

INVESTIGATION WORKS

4.0 SUPERSTRUCTURE

SUPERSTRUCTURE

TOTAL AMOUNT (Excluding GST)

5.0 BEARINGS

GIRDERS

8.0 MISCELLANEOUS ITEMS

MISCELLANEOUS ITEMS

7.0 APPROACH WORKS

APPROACH WORKS

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE4% DISCOUNT RATE

TRAFFIC

Annual Average Daily Traffic (AADT) on the bridge

Year AADT2007 6105

Traffic Growth Rate 1.95% per annum

Percentage of Heavy Vehicles 8%

Average Speed Limit of Detour Route for light vehicles 60 km/hAverage Speed Limit of Detour Route for heavy vehicles 100 km/h

Do Nothing Option 2 Option 3A Option 3B Option 3C Option 4A Option 4B6 6 6 6 6 6 0 km

200 200 200 200 200 200 0 km

Number of Crashes in 2004-2008 3 crashes (with 100m of bridge abutments excluding intersection related crashes)

FLOODING INFORMATION

Option Description

RL (Relative Level difference between top of deck levels) (m)

Frequency of Bridge Closure

(1 in 'x' yrs)

Length of Deck (m)

Number of Days after Flood until

bridge is servicable (per

flood)

Do Nothing Base Case 0 20 55 14Option 2 Rehabilitation of existing piles 0 20 55 12Option 3A New piles and prestressed headstocks 0 20 55 10Option 3B New piles and prestressed headstocks 0 20 55 10Option 3C New steel piles and steel headstocks 0 20 55 10Option 4A New bridge on existing alignment 0 20 55 7

Option 4B New bridge adjacent to existing alignment 2.25 10000 200 0

Difference in Length of Detour Route for light vehiclesDifference in Length of Detour Route for heavy vehicles

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE4% DISCOUNT RATE

CONSTRUCTION COSTS

Description Do Nothing Option 2 Option 3A Option 3B Option 3C Option 4A Option 4BBridge Costs -$ 2,500,000.00$ 3,500,000.00$ 3,000,000.00$ 3,500,000.00$ 9,500,000.00$ 16,500,000.00$

2,500,000.00$ 3,500,000.00$ 3,000,000.00$ 3,500,000.00$ 9,500,000.00$ 16,500,000.00$ Salvage Value after 30 years 0 0 0 0 20% 75%

POST FLOOD REPAIRS AND MAINTENANCE COSTS

Option Description LengthAssumed Post-

Flood Repair Cost

Routine Maintenance

Costs (pa)

Do Nothing Base Case 200 100,000$ 15,000$ Option 2 Rehabilitation of existing piles 200 70,000$ 10,000$ Option 3A New piles and prestressed headstocks 200 70,000$ 10,000$ Option 3B New piles and prestressed headstocks 200 70,000$ 10,000$ Option 3C New steel piles and steel headstocks 200 70,000$ 12,000$ Option 4A New bridge on existing alignment 200 20,000$ 5,000$

Option 4B New bridge adjacent to existing alignment 200 5,000$ 2,000$

ECONOMIC PARAMETER COST (2007)

Average Value of Time Light vehicles $31.35 per veh/hr Discount Factor 4%Heavy vehicles $31.92 per veh/hr

Vehicle Operating CostsLight vehicles 29.75 cents/kmHeavy vehicles 133.1 cents/km

Average Accident Cost $160,400

Year of Opening of the Project 2011

Total Costs including 50% contingency

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE4% DISCOUNT RATE

RESULTS OF ECONOMIC ANALYSIS

Option Description RTA Cost Road User Costs(over 30 years) (over 30 years)

Do Nothing Base Case $359,674 $5,224,595Option 2 Rehabilitation of existing piles $2,742,780 $4,781,535Option 3A New piles and prestressed headstocks $3,742,780 $4,338,475Option 3B New piles and prestressed headstocks $3,404,481 $4,338,475Option 3C New steel piles and steel headstocks $3,778,748 $4,338,475Option 4A New bridge on existing alignment $7,707,902 $3,673,885Option 4B New bridge adjacent to existing alignment $4,160,976 $2,123,175

Incremental Benefit Cost Ratio (IBCR) Calculations

Option IBCRCheapest RTA option - Do NothingThe next highest cost option (Option 2) 0.2The next highest cost option (Option 3A) 0.3The next highest cost option (Option 3B) 0.3The next highest cost option (Option 3C) 0.3The next highest cost option (Option 4A) 0.2The next highest cost option (Option 4B) 0.8

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE7% DISCOUNT RATETRAFFIC

Annual Average Daily Traffic (AADT) on the bridge

Year AADT2007 6105

Traffic Growth Rate 1.95% per annum

Percentage of Heavy Vehicles 8%

Average Speed Limit of Detour Route for light vehicles 60 km/hAverage Speed Limit of Detour Route for heavy vehicles 100 km/h

Do Nothing Option 2 Option 3A Option 3B Option 3C Option 4A Option 4BLength of Detour 6 6 6 6 6 6 0 kmLength of Detour 200 200 200 200 200 200 0 km

Number of Crashes in 2004-2008 3 crashes (with 100m of bridge abutments excluding intersection related crashes)

FLOODING INFORMATION

Option Description

RL (Relative Level

difference between top of

deck levels) (m)

Frequency of Bridge Closure

(1 in 'x' yrs)

Length of Deck (m)

Number of Days after Flood until

bridge is servicable (per

flood)

Do Nothing Base Case 0 20 55 14Option 2 Rehabilitation of existing piles 0 20 55 12Option 3A New piles and prestressed headstocks 0 20 55 10Option 3B New piles and prestressed headstocks 0 20 55 10Option 3C New steel piles and steel headstocks 0 20 55 10Option 4A New bridge on existing alignment 0 20 55 7Option 4B New bridge adjacent to existing alignment 2.25 10000 200 0

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE7% DISCOUNT RATE

CONSTRUCTION COSTS

Description Do Nothing Option 2 Option 3A Option 3B Option 3C Option 4A Option 4BBridge Costs $ - 5,000,000$ 7,000,000$ 6,000,000$ 17,500,000$ 9,500,000$ 16,500,000$

5,000,000$ 7,000,000$ 6,000,000$ 17,500,000$ 9,500,000$ 16,500,000$ Salvage Value after 30 years 25% 25% 25% 0 20% 75%Note - Options 2, 3A and 3B have repeated costs in 2030, Option 3C has repeated costs in 2015, 2020, 2025, 2030 and 2035POST FLOOD REPAIRS AND MAINTENANCE COSTS

Option Description LengthAssumed Post-Flood Repair

Cost

Routine Maintenance

Costs (pa)

Do Nothing Base Case 200 100,000$ 15,000$ Option 2 Rehabilitation of existing piles 200 70,000$ 10,000$ Option 3A New piles and prestressed headstocks 200 70,000$ 10,000$ Option 3B New piles and prestressed headstocks 200 70,000$ 10,000$ Option 3C New steel piles and steel headstocks 200 70,000$ 12,000$ Option 4A New bridge on existing alignment 200 20,000$ 5,000$ Option 4B New bridge adjacent to existing alignment 200 5,000$ 2,000$

ECONOMIC PARAMETER COST (2007)

Average Value of Time Light vehicles $31.35 per veh/hr Discount Factor 7%Heavy vehicles $31.92 per veh/hr

Vehicle Operating CostsLight vehicles 29.75 cents/kmHeavy vehicles 133.1 cents/km

Average Accident Cost $160,400

Year of Opening of the Project 2011

Total Costs including 50% contingency

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE7% DISCOUNT RATE

RESULTS OF ECONOMIC ANALYSIS

Option Description RTA Cost Road User Costs(over 30 years) (over 30 years)

Do Nothing Base Case $265,553 $3,746,295Option 2 Rehabilitation of existing piles $3,929,249 $3,428,362Option 3A New piles and prestressed headstocks $5,429,249 $3,110,428Option 3B New piles and prestressed headstocks $4,904,117 $3,110,428Option 3C New steel piles and steel headstocks $17,705,804 $3,110,428Option 4A New bridge on existing alignment $7,679,666 $2,633,528Option 4B New bridge adjacent to existing alignment $4,151,562 $1,520,761

Incremental Benefit Cost Ratio (IBCR) Calculations

Option IBCRCheapest RTA option - Do NothingThe next highest cost option (Option 2) 0.09The next highest cost option (Option 3A) 0.12The next highest cost option (Option 3B) 0.14The next highest cost option (Option 3C) 0.04The next highest cost option (Option 4A) 0.15The next highest cost option (Option 4B) 0.57

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE10% DISCOUNT RATE

TRAFFIC

Annual Average Daily Traffic (AADT) on the bridge

Year AADT2007 6105

Traffic Growth Rate 1.95% per annum

Percentage of Heavy Vehicles 8%

Average Speed Limit of Detour Route for light vehicles 60 km/hAverage Speed Limit of Detour Route for heavy vehicles 100 km/h

Do Nothing Option 2 Option 3A Option 3B Option 3C Option 4A Option 4B6 6 6 6 6 6 0 km

200 200 200 200 200 200 0 km

Number of Crashes in 2004-2008 3 crashes (with 100m of bridge abutments excluding intersection related crashes)

FLOODING INFORMATION

Option Description

RL (Relative Level difference between top of deck levels) (m)

Frequency of Bridge Closure

(1 in 'x' yrs)

Length of Deck (m)

Number of Days after Flood until

bridge is servicable (per

flood)

Do Nothing Base Case 0 20 55 14Option 2 Rehabilitation of existing piles 0 20 55 12Option 3A New piles and prestressed headstocks 0 20 55 10Option 3B New piles and prestressed headstocks 0 20 55 10Option 3C New steel piles and steel headstocks 0 20 55 10Option 4A New bridge on existing alignment 0 20 55 7

Option 4B New bridge adjacent to existing alignment 2.25 10000 200 0

Difference in Length of Detour Route for light vehiclesDifference in Length of Detour Route for heavy vehicles

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE10% DISCOUNT RATE

CONSTRUCTION COSTS

Description Do Nothing Option 2 Option 3A Option 3B Option 3C Option 4A Option 4BBridge Costs $ - 5,000,000$ 7,000,000$ 6,000,000$ 17,500,000$ 9,500,000$ 16,500,000$

5,000,000$ 7,000,000$ 6,000,000$ 17,500,000$ 9,500,000$ 16,500,000$ Salvage Value after 30 years 25% 25% 25% 0 20% 75%Note - Options 2, 3A and 3B have repeated costs in 2030, Option 3C has repeated costs in 2015, 2020, 2025, 2030 and 2035POST FLOOD REPAIRS AND MAINTENANCE COSTS

Option Description LengthAssumed Post-

Flood Repair Cost

Routine Maintenance

Costs (pa)

Do Nothing Base Case 200 100,000$ 15,000$ Option 2 Rehabilitation of existing piles 200 70,000$ 10,000$ Option 3A New piles and prestressed headstocks 200 70,000$ 10,000$ Option 3B New piles and prestressed headstocks 200 70,000$ 10,000$ Option 3C New steel piles and steel headstocks 200 70,000$ 12,000$ Option 4A New bridge on existing alignment 200 20,000$ 5,000$

Option 4B New bridge adjacent to existing alignment 200 5,000$ 2,000$

ECONOMIC PARAMETER COST (2007)

Average Value of Time Light vehicles $31.35 per veh/hr Discount Factor 10%Heavy vehicles $31.92 per veh/hr

Vehicle Operating CostsLight vehicles 29.75 cents/kmHeavy vehicles 133.1 cents/km

Average Accident Cost $160,400

Year of Opening of the Project 2011

Total Costs including 50% contingency

ECONOMIC ANALYSIS FOR BURRILL LAKE BRIDGE10% DISCOUNT RATE

RESULTS OF ECONOMIC ANALYSIS

Option Description RTA Cost Road User Costs(over 30 years) (over 30 years)

Do Nothing Base Case $207,392 $2,853,155Option 2 Rehabilitation of existing piles $3,889,990 $2,610,859Option 3A New piles and prestressed headstocks $5,389,990 $2,368,564Option 3B New piles and prestressed headstocks $4,903,773 $2,368,564Option 3C New steel piles and steel headstocks $17,660,729 $2,368,564Option 4A New bridge on existing alignment $7,662,218 $2,005,120Option 4B New bridge adjacent to existing alignment $4,145,744 $1,157,084

Incremental Benefit Cost Ratio (IBCR) Calculations

Option IBCRCheapest RTA option - Do NothingThe next highest cost option (Option 2) 0.07The next highest cost option (Option 3A) 0.09The next highest cost option (Option 3B) 0.10The next highest cost option (Option 3C) 0.03The next highest cost option (Option 4A) 0.11The next highest cost option (Option 4B) 0.43