ATTACHMENT 4 TO CLAUSE 2 EARTHQUAKE RECOVERY COMMITTEE...

Photo 9 – Hazard area 109


ATTACHMENT 4 TO CLAUSE 2 EARTHQUAKE RECOVERY COMMITTEE OF THE WHOLE 1. 5. 2014

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Photo 30 – Hazard area 203/204



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Photo 36 – Hazard area 211A



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Appendix DRocFall Modelling Data


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Section 1 – Sumner Road RocFall Modeling


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Section 2 - Sumner Road RocFall Modeling


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Section 9 – Sumner Road RocFall Modelling


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Aurecon New Zealand Limited

Unit 1, 150 Cavendish Road Casebrook Christchurch 8051

PO Box 1061 Christchurch 8140 New Zealand

T +64 3 366 0821 F +64 3 379 6955 E [email protected] W aurecongroup.com

Aurecon offices are located in: Angola, Australia, Botswana, China, Ethiopia, Hong Kong, Indonesia, Lesotho, Libya, Malawi, Mozambique, Namibia, New Zealand, Nigeria, Philippines, Singapore, South Africa, Swaziland, Tanzania, Thailand, Uganda, United Arab Emirates, Vietnam.


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Appendix HStage 2, Variation 2 Letter


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31 October 2013 Lynne Armitage Project Manager Christchurch City Council 36 Lichfield Street Christchurch 8011 Dear Lynne Sumner Road Stage 2 Review of DDSRA Assessment for Public Access

1 Introduction

As instructed by Christchurch City Council on 22nd October 2013 Aurecon undertook a review of the Stage 2 Detailed Phase Designation and Detailed Slope Risk Assessment (DDSRA) along Sumner Road. This review was used to gain an understanding of what impact opening the road for public use would have on the risk level previously calculated for corridor access only, and how this would affect the level of remediation work which would need to be undertaken on the bluffs above Sumner Road.

2 Review for public use

Following the field mapping exercise and the roped access inspection, the Detailed Phase assessment was completed in accordance with the DDSRA Procedure (Aurecon, 2013) during Stage 2. The procedure utilises a comprehensive visual inspection and a series of assessment tables and risk registers which review likelihood of the event, consequence to asset and consequence to life/injury (temporal probability and vulnerability) parameters to determine the risk level and risk category of an individual hazard.

The system allows for the recording of key details, sketches and any additional information which can be used at a later stage. The DDSRA system has been developed recently and trialled on several sites proving a suitable method for qualitative slope risk assessment for the site.

When originally assessed during Stage 2 the road was not intended to be used by the public or normal traffic usage and was planned for corridor access only. Hence the temporal probability in the DDSRA was based on limited use. We estimated that the traffic volumes would be no more than 30 people/vehicles on the road per day which gives a T1 (the lowest temporal probability). The vulnerability was also adjusted to people working in open spaces with specific health and safety plans in place rather than travelling in vehicles.

We have now undertaken a review of the DDSRA results from the Stage 2 assessment as instructed by Christchurch City Council (CCC) to consider the change in risk category on each of the hazard zones if the road was to be opened to the public with higher traffic volumes.

When undertaking the DDSRA assessment review to consider the road being open for public use we used pre-earthquake traffic flows provided by CCC of 1253 vehicles per day. This gives a temporal probability of a T3 which covers from 270 to 2600 vehicles per day. The vulnerability has also been adjusted to people driving in vehicles at the road speed limit which is 70 km/ph; with block sizes over


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1m dimension giving a Vulnerability of V4 instead of people working in open spaces. A T3 and V4 rating gives a consequence for life/injury of C4 when they are combined.

A summary of the identified hazards, risk levels and risk categories derived from the original DDSRA assessment and the revised DDSRA assessment are shown in Table 1 below and on Drawing GEO 03 A and GEO 04 A attached.

Table 1 - Summary of the Detailed DDSRA results

Hazard Zone

Hazard Number

Hazard Type/Feature

Risk Value (corridor

access only)

Risk Category (corridor

access only

Risk Value (public access)

Risk Category (public access)

1

101 Bluff failure 6 RC2 12 RC3

102 Boulder roll 2 RC2 8 RC3



2





3 202 Boulder roll (talus slope)

16 RC4 16 RC4

4 211 Bluff failure 25 RC5 25 RC5

5















216 Gully release 16 RC4 16 RC4



221 Gully release 16 RC4 16 RC4

6 118 Bluff failure 12 RC3 16 RC4

124 Boulder roll (talus slope)

9 RC3 12 RC3

7 112 Boulder roll 20 RC5 20 RC5


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Hazard Zone

Hazard Number

Hazard Type/Feature

Risk Value (corridor

access only)

Risk Category (corridor

access only

Risk Value (public access)

Risk Category (public access)

(behind tree)


15 RC4 20 RC5







2 RC1 4 RC2


8A

105 Road cutting

failure 16 RC4 16 RC4

108 Road cutting


211A Road cutting


215 Road cutting


220 Road cutting


223 Soil road

cutting failure 10 RC3 10 RC3

224 Rock road


227 Rock road


8B

104 Embankment


111 Embankment


214 Embankment


217 Embankment


222 Embankment


226 Embankment


9 225 Major road



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284

200

202

110

109

108

201

111104

106

105

103102

101

211A211212/213

203/204

216

214215217220

218/219

107

209/210115

116

117

221

222

124

223

123

113

114119112122

120

225

224

226227

228121

205/206

207/208

HIGHEST RC VALUE ALONG ROAD LEVEL RC3RC4RC5RC5RC5RC4RC5RC4RC5RC4RC5RC4RC3RC5

Recreation Reserve

Lyttelton PortCompany Limited



CCC Waste WaterTreatment PlantCrown Land

727-

3331

m

445-

727m

WindyPoint

BatteryPoint



118Crown Land

Scenic Reserve

RC5

LEGENDRISK CATEGORIES

RC1

RC2

RC3

RC4

RC5

BASED ON DDSRA (AURECON 2013)TABLE 12

CLIENT

DATE TITLE

REVISION DETAILSDATEREV APPROVED

CHECKED

APPROVED

PROJECT

DRAWN

DESIGNED

PROJECT No. TYPE REVWBS DISC NUMBER DRAWING No.

SCALE SIZEA1

.

DDSRA SUMNER ROAD

RISK HAZARD AREASREVIEW FOR PUBLIC ACCESS

236152 0000 DRG GEO 03 B

NTSISSUE

INFORMATION

R DAWSON

L SWATTON

I McPHERSON I McPHERSON

A 23.10.13 ISSUE I McPHERSONB 30.10.13 HAZARD AREA 223 & RELATED ROAD AMENDED I McPHERSON

Filen

ame:

Plot

Date:

Offic

e:P:

\2361

52\C

ADD\

DWGS

\GEO

TECH

\2361

52-G

EO-0

3 AND

04.D

WG

30/10

/2013

2:20

:36 p.

m.NZ

CHC

AREAS SHOWN ARE BASED ON FIELDWORK UNDERTAKEN13 SEPTEMBER 2013 TO 19 SEPTEMBER 2013


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SUMNER

ROAD

LYTTELTON

OLD

SUMNER

ROAD

ASSESSMENT AREA

Lyttelton Port

Company Limited

Lyttelton Port

Company Limited

Lyttelton Port

Company Limited

Lyttelton Port

Company Limited

Scenic Reserve

Crown Land

Recreation Reserve

00m

100m

200m

300m

400m

500m

600m

700m

800m

900m

1000m

1100m

1200

m

1300m

1400m

1500m

1600m

1700m

1800m

1900m

2000m

2100m

2200m

2300m

2400

m

2500m445-727m

321-445m

187-321m

727-3331m

Windy

Point

Battery

Point

CLIENT

DATE TITLE

REVISION DETAILSDATEREV APPROVED

CHECKED

APPROVED

PROJECT

DRAWN

DESIGNED

PROJECT No. TYPE REVWBS DISC NUMBER DRAWING No.

SCALE SIZEA1

.

DETAILED DDSRA SUMNER ROAD

ROAD RISK CATEGORIESREVIEW FOR PUBLIC ACCESS

236152 0000 DRG GEO 04 B

1:3000ISSUE

INFORMATION

R DAWSON

L SWATTON

I McPHERSON I McPHERSON

A 25.10.13 ISSUE I McPHERSONB 30.10.13 ROAD ADEAS AMENDED WRT HAZARD AREA 223 I McPHERSON

Filen

ame:

Plot

Date:

Offic

e:P:

\2361

52\C

ADD\

DWGS

\GEO

TECH

\2361

52-G

EO-0

3 AND

04.D

WG

30/10

/2013

2:17

:34 p.

m.NZ

CHC

LEGENDRISK CATEGORIES

RC1

RC2

RC3

RC4

RC5

AREAS SHOWN ARE BASED ON FIELDWORK UNDERTAKEN13 SEPTEMBER 2013 TO 19 SEPTEMBER 2013

030 60 120m

SCALE 1:3000


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Aurecon New Zealand Limited

Unit 1, 150 Cavendish Road Casebrook Christchurch 8051

PO Box 1061 Christchurch 8140 New Zealand

T +64 3 366 0821 F +64 3 379 6955 E [email protected] W aurecongroup.com

Aurecon offices are located in: Angola, Australia, Botswana, China, Ethiopia, Hong Kong, Indonesia, Lesotho, Libya, Malawi, Mozambique, Namibia, New Zealand, Nigeria, Philippines, Singapore, South Africa, Swaziland, Tanzania, Thailand, Uganda, United Arab Emirates, Vietnam.


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Project 236152 File Sumner Road Stage 3A&B Concept Design report 13 December 2013 Revision 0 Page 8

Figure 1 – Areas of work for Stage 3A and 3B locations along Sumner Road and Key Feature.

Figure 2 – All 49 hazard zones along Sumner Road

Stage 3B Area

Stage 3A Area

Stage 3A Area

Note The hazard zone numbers were assigned in the field and have no particular significance other than as a unique identifier.

Lyttelton

LPC

Evans Pass Road

Old Lyttelton Sumner Road

Sumner Road

Coal Handling Terminal

Note Based on oblique aerial photograph. Not to scale, photo taken 14/08/13


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Key Information

Sumner Road Re-opening Project

Information Leaflet April 2014

The Christchurch City Council proposes to undertake works to reduce the risk from geotechnical hazards to road users, and to repair the road and retaining walls to enable the reopening of the earthquake damaged Sumner Road to the public, from Reserve Terrace to the Summit Road.

BackgroundSumner Road provides an important link from Christchurch/Sumner to Lyttelton for both the general public and for the Port of Lyttelton. Prior to the Canterbury earthquakes, the road served as an alternative route for port vehicles that were unable to use the Lyttelton Road Tunnel. Users included over-sized vehicles, and those carrying specified hazardous substances. Since the closure of the road due to risk of rockfall and significant damage to the road surface, those vehicles have accessed the port via Dyers Pass or Gebbies Pass. These are longer routes, with the Dyers Pass route also passing through residential areas. The road was also a popular link for cyclists and serves as alternative route to the port should an emergency (including a natural disaster) close other roads.

This leaflet aims to provide nearby residents and other stakeholders with information about the project. The Christchurch City Council’s public consultation generally invites the community to give feedback about elements that can add value to a project. Because the main elements of this project are driven by the technical design and health & safety requirements relating to the location and layout, we are not seeking any further feedback on the benching and other repair work.

If you require further information about the project please contact Christine Toner (details on the back of this leaflet) or view the Project Infromation Number 4663 and www.ccc.govt.nz/porthillsgeotech

This is an ‘Earthquake Recovery Project’. The works are required for the purpose of reopening the earthquake damaged Sumner Road. Christchurch City Council undertakes to inform Lyttelton, Sumner and Redcliffs communities and other stakeholders. Key stakeholders including Department of Conservation, Lyttelton Port Company, Ngai Tahu, Summit Road Protection Authority and Ngati Wheke Runanga have been consulted and involved in decision making on this project to date.

ELEC

08/4

598

For further information please contact:

Christine TonerConsultation LeaderChristchurch City CouncilPO Box 73011Christchurch Mail Centre Christchurch 8154Phone (03) 941 8355Email [email protected]

or view Project Information and Frequently Asked Questions (FAQs) at www.ccc.govt.nz/sumnerroadreopening and www.ccc.govt.nz/porthillsgeotech

Anticipated effects:

The proposed project methodology has been subject to rigorous professional and technical investigation and peer review by a multi-disciplinary team including planners, engineers, geologists, landscape architects, construction and operations consultants, and ecologists.The team has investigated many potential effects during construction and in the long term. These include threats to plant and wildlife; erosion; stormwater runoff; nuisance, noise and dust effects; landscape impacts; impacts on walkers and mountain bikers using the Crater Rim paths and many more. They are developing strategies for avoiding, remedying and mitigating these effects, which may include native restoration planting and gecko translocation.

Project TimelineIt is expected that the proposed work will start mid 2014 and the road potentially open at the end of 2016.


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The proposed works :The area for the proposed work extends from the small upper bluffs approximately 100m from the Evans Pass layby down to Reserve Terrace. It includes the Crater Rim Bluffs and the slopes below these, the Battery Point Bluffs, the road cuttings, the forested areas and Double Gully. After this work is completed the embankments and retaining walls below the road under the Crater Rim Bluffs will require repairs.

The proposed work varies depending on the specific area of the site, and includes scaling to remove loose surface materials; blasting to remove boulders and outcrops; and earthworks including engineered removal of soil and rock to reshape the land. Bunds will also be required to contain any future rock fall. The earthworks will include the construction of terraces.There is also a proposal for the Council to undertake native restoration planting in the area adjacent to Buckleys Bay Scenic

Reserve (see locality diagram) which would contribute towards environmental mitigation for the project.Minimal disturbance and disruption to the residents of Lyttelton Harbour and Sumner/Redcliffs areas is a priority.The overall project will be undertaken in two phases as follows:

• Works above Sumner Road to reduce risks to road users.

• Road works by contractors to repair the road, including retaining walls and any necessary drainage.

The works will generally move from the higher parts of the site down toward the road and from west and eastern sides of the project site toward the centre. It is possible that some stages may occur simultaneously.

Existing View

Artists Impression Post Construction


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