APPENDIX C APPENDIX C APPENDIX technical land information The Plains - area-wide suburb Plains - area-wide The EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012 68 0 REV No. Port Levy ! Sumner Scarborough FACT SHEETS FACT Area-wide Suburbs South 13 Southshore New Brighton Clifton MapReference Sheet TECHNICALLAND INFORMATION FIGURENo. Bexley 9 Lyttelton DiamondHarbour MtPleasant North New Brighton 1:100,000 New Brighton PinesBeach KairakiBeach MoncksSpur 2 3 WaimairiBeach Heathcote 5 52020.0200 Spencerville SCALE (AT A3SIZE) SCALE (AT CHECKED APPROVED ARCFILE DRAWN PREPARED TONKINBYLTD & TAYLOR PROJECT No. Brooklands Queenspark Bromley Travis Wainoni Burwood Avondale Parklands Woolston 8 North Linwood 12 St AndrewsStHill Hillsborough Dallington Westhaven Linwood Ouruhia Shirley Waltham StMartins North Kaiapoi Chaneys Richmond 1 Phillipstown Marshland Kaiapoi Lakes South Kaiapoi GovernorsBay Bridgend Beckenham 7 St Albans St Belfast Sydenham 11 Central City Cashmere Redwood 4 Merivale Somerfield Addington Styx Northcote Casebrook Hoon HayValley Riccarton Location Plan Westmorland 6 10 Middleton Bishopdale Ilam Hillmorton Burnside UpperRiccarton Oaklands 14 Westlake Sockburn Hyde Park Tai Tapu Tai Masham WentworthPark Russley HeiHei Harewood Hornby 15 1:100,000 RiccartonPark Islington Prebbleton A3 SCALE Lincoln 0 1 2 3 4 5 (km) Road Database supplied byInternationalTerralink Ltd. Rivers, lagoons andcoastline licensed under Creative CommonsAttribution 3.0 NewZealand and sources from LINZ Notes: Yaldhurst Templeton EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012 87

Factsheet 10 - Hillmorton to Riccarton Hillmorton, Hoon Hay, Riccarton and Upper Riccarton

each earthquake, and then on a property-by-property level 10.1 Ground conditions and groundwater Table C10.2 - Summary of ground elevation and groundwater depth (September 2011) Regional geology maps show this area is generally underlain over the following weeks. This mapping was supported by air- Suburb Ground elevation above sea level Groundwater depth by dominantly alluvial sand and silt overbank deposits, with photo analysis for all four main earthquakes, and additional some areas of alluvial gravel, sand and silt of historic river regional or street-level mapping for the earthquakes of Hillmorton Typically 14.2m to 16.3m (Avg 15.1m) Typically 1.7m to 3.0m (Avg 2.3m) flood channels. 13 June 2011 and 23 December 2011. This additional mapping Hoon Hay Typically 9.9m to 13.7m (Avg 11.6m) Typically 0.4m to 1.7m (Avg 0.7m) indicated that the overall pattern of liquefaction and lateral Table C10.1 summarises the area-wide subsurface ground Riccarton Typically 8.6m to 13.5m (Avg 10.9m) Typically 0.5m to 1.8m (Avg 1.2m) spreading for the subsequent earthquakes was generally investigations undertaken by EQC in this area following the Upper Riccarton Typically 15.3m to 23.7m (Avg 20.1m) Typically 1.4m to 5.7m (Avg 3.0m) similar to that observed in the first two main earthquakes. 4 September 2010 and 22 February 2011 earthquakes. These investigations indicate that the near-surface soil Figure C10.1 and Table C10.3 present a summary of the Table C10.3 - Summary of liquefaction and lateral spread observations for residential land, aggregated profile in the area generally comprises loose to dense sands, property-by-property rapid mapping of liquefaction and from mapping undertaken following earthquakes of 4 September 2010 and 22 February 2011 silts and gravel. lateral spread observations in this area. The observations Table C10.2 summarises typical ground elevation and following the 4 September 2010 and 22 February 2011 groundwater depths in the area (the values listed correspond earthquakes have been aggregated by assigning each to the 10th and 90th percentiles and the median). This was property the most severe observation from either of these derived from LiDAR ground elevation survey commissioned two earthquakes. These observed liquefaction and lateral by EQC in September 2011, and a groundwater surface spread mapping colours have completely different developed from recent EQC groundwater monitoring meaning to the colour codes used by the Canterbury Earthquake Recovery Authority (Cera) for residential land in conjunction with historic Environment Canterbury Suburb groundwater data. This area is generally elevated well above zoning and the Department of Building and Housing (DBH) Total residential residential Total property count Not mapped ground No observed or ejected cracking liquefied material cracking, Minor ground ejected but no observed liquefied material but spreading, No lateral quantities minor to moderate of ejected material spreading, No lateral quantities of but large ejected material to major Moderate ejected spreading, lateral often observed material spreading, lateral Severe often ejected material observed sea level with a shallow to moderate depth to groundwater. for technical categories. Hillmorton 543 1% 59% <1% 38% <1% 1% 0%

The ground conditions and groundwater in this area are Table C10.4 summarises the change in ground elevation Hoon Hay 2957 13% 55% 1% 31% <1% <1% 0% generally similar to most of the southern, central and inferred from the LiDAR survey. The total change in ground Riccarton 3689 57% 36% <1% 6% 0% <1% 0% northern suburbs of Christchurch. elevation which has occurred is a combination of regional Upper Riccarton 3487 100% 0% 0% 0% 0% 0% 0% While ground surface disturbance has occurred in some uplift or subsidence due to fault movements (tectonics) areas (e.g. settlement, cracking and ejection of material), and local ground subsidence due to liquefaction and related the underlying ground which liquefied appears to have now effects. The LiDAR is of limited accuracy (about ±100mm). Table C10.4 - Changes in ground elevation inferred from LiDAR survey returned to its pre-earthquake strength. This means that the LiDAR is more suitable for measuring Suburb Change in ground elevation from July 2003 to September 2011 large changes in ground elevation (greater than about 100 to (positive values are uplift, negative values are subsidence) 10.2 Post-earthquake observations 200mm), and may not accurately represent areas where only Hillmorton Typically -150mm to +50mm (Average -50mm) Rapid mapping of liquefaction and lateral spreading minor changes in ground elevation have occurred. observations was undertaken following the 4 September Hoon Hay Typically -200mm to +50mm (Average -50mm) 2010 and 22 February 2011 earthquakes, first on a regional Table C10.5 summarises the extent and severity of observed Riccarton Typically -250mm to +0mm (Average -150mm) and street-by-street level in the days immediately after liquefaction and lateral spread. Upper Riccarton Typically -200mm to +50mm (Average -100mm)

Table C10.1 - Area-wide geotechnical investigations undertaken by EQC (December 2011) Suburb Number of cone Number of Number of groundwater Length of MASW penetration tests boreholes standpipes geophysical testing (m) Hillmorton 5 - 2 -

Hoon Hay 25 3 9 -

Riccarton - - - -

Upper Riccarton - - - -

ENVIRONMENTAL AND ENGINEERING CONSULTANTS EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012 88

Factsheet 10 - Hillmorton to Riccarton Hillmorton, Hoon Hay, Riccarton and Upper Riccarton

Table C10.5 - Liquefaction and lateral spread observations Unmapped, no observations (uncoloured) No lateral spreading but large quantities of ejected material No observed ground cracking or ejected liquefied material Moderate to major lateral spreading; ejected material often observed Suburb Observations Minor ground cracking but no observed ejected liquefied material Severe lateral spreading; ejected material often observed No lateral spreading but minor to moderate quantities of ejected material Territorial Authority suburb boundary

Hillmorton Minor to moderate liquefaction in several areas (severe liquefaction on a small number of CREYKE ROAD WEKA STREET Hoon Hay properties), causing sand ejection and settlement. KOTARE STREET

Riccarton ROCHDALE STREET Minor to moderate lateral spreading towards the Heathcote and Avon Rivers in several small ARTS ROAD CORFE STREET ATHOL TERRACE HARAKEKE STREET

areas, but localised to the immediately adjacent properties. STREET TUI

CLYDE ROAD KAHU ROAD For the remainder of these suburbs, no surface evidence of liquefaction or related land effects HOMESTEAD LANE MATAI STREET EAST WAIMAIRI ROAD

ILAM ROAD was observed. PURIRI STREET

SISKA PLACE BALGAY STREET KILMARNOCK STREET HINAU STREET Upper Riccarton This suburb was not mapped at a property-by-property level, however street-level mapping and KAURI STREET AYR STREET KIRKWOOD AVENUE RATA STREET STRAVEN ROAD air photo analysis found no surface evidence of liquefaction or related land effects. BRODIE STREET PEER STREET BOWEN STREET HANRAHAN STREET TOTARA STREET

PAEROA STREET

For further area-wide geotechnical information, refer to the technical data reports RUDLEIGH AVENUE RICCARTON ROAD BROCKWORTH PLACE

EUSTON STREET MANDEVILLE STREET on the EQC website, at http://canterbury.eqc.govt.nz/news/reports Upper Riccarton DALLAS STREET

WHARENUI ROAD

PICTON AVENUE LOCHEE ROAD Riccarton PEVEREL STREET

WAINUI STREET HAYNES AVENUEHANSONS LANE

MATIPO STREET

OWENS TERRACE TIKA STREET SUVA STREET MIDDLETON ROAD ELIZABETH STREET VICKI STREET MAYFAIR STREET

PUNA STREET LYNDON STREET TYNE STREET JANET STREET

MIDWAY LANE ARTHUR STREET BLENHEIM ROAD PRINCESS STREET

ACHERON DRIVE AVENUE DEANS

ANNEX ROAD Linwood, North Linwood, Opawa, Phillipstown, St Martins, Waltham & Woolston

HANDS ROAD SHOW PLACE WHITELEIGH AVENUE

JIPCHO ROAD Middleton WALSALL STREET

LUNNS ROAD BIRMINGHAM DRIVE

CHRISTCHURCH SOUTHERN MOTORWAY Sockburn MAGDALA PLACE

TORRENS ROAD MOKIHI GARDENS ANNEX ROAD LINCOLN ROAD CURLETTS ROAD SYLVAN STREET

SONTERHAYTON ROAD ROAD DEANS AVENUE O'DONNELL ROAD ROYAL AVENUE SOUTHERN MOTORWAY EXTENSION MACFARLANE AVENUE DOMAIN TERRACE ROAD EDINBURGH STREET GRIGG AVENUE NEVILLE STREET

LYTTELTON STREET

COBHAM STREET HOON HAY ROAD

TANKERVILLE ROAD

Hillmorton BEAN STREET CARDINAL DRIVE REDGRAVE STREET FUSILIER STREET TEMPLETONS ROAD WEST-WATSON AVENUE GREENPARK STREET MCBEATH AVENUE SMARTLEA STREET

HALSWELL ROAD ROWLEY AVENUE WYN STREET

NORTHCROFT STREET MATHERS ROADCEDARS STREET

DOWNING STREET MCMAHON DRIVE HENDERSONS ROAD DALKEITH STREET

SAMUEL STREET Applicability - This report was prepared and/or compiled for the Earthquake Commission (EQC) to communicate information MARYHILL AVENUE SPARKS ROAD that may be relevant to residential land claims under the Earthquake Commission Act 1993. The report was not intended for Hoon Hay SPARKS ROAD any other purpose and may not be relied upon for any other purpose. EQC and its engineers, Tonkin & Taylor, have no liability to any user of any map(s) and data in this report or for the consequences of any other person relying on them in any way. This Figure C10.1 - Overview of liquefaction and lateral spreading observations, aggregated from mapping undertaken following information is not intended to form a complete technical report on land changes in all or any part of Canterbury. the earthquakes of 4 September 2010 and 22 February 2011.

ENVIRONMENTAL AND ENGINEERING CONSULTANTS