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 79

Factsheet 6 - Ilam to Bishopdale Bishopdale, Bryndwr, Burnside, Fendalton and Ilam

over the following weeks. This mapping was supported by air- 6.1 Ground conditions and groundwater Table C6.2 - Summary of ground elevation and groundwater depth (September 2011) Regional geology maps show this area is generally underlain photo analysis for all four main earthquakes, and additional by dominantly alluvial sand and silt overbank deposits. regional or street-level mapping for the earthquakes of Suburb Ground elevation above sea level Groundwater depth 13 June 2011 and 23 December 2011. This additional mapping Bishopdale Typically 16.4m to 18.2m (Avg 17.8m) Typically 2.1m to 2.9m (Avg 2.5m) Table C6.1 summarises the area-wide subsurface ground indicated that the overall pattern of liquefaction and lateral Bryndwr Typically 11.3m to 16.7m (Avg 14.5m) Typically 0.7m to 2.5m (Avg 1.8m) investigations undertaken by EQC in this area following the spreading for the subsequent earthquakes was generally 4 September 2010 and 22 February 2011 earthquakes. Burnside Typically 17.4m to 22.2m (Avg 19.8m) Typically 2.0m to 3.6m (Avg 3.0m) similar to that observed in the first two main earthquakes. These investigations indicate that the near-surface soil Fendalton Typically 9.3m to 13.6m (Avg 11.4m) Typically 0.4m to 1.4m (Avg 0.9m) profile in the area generally comprises very loose to dense Figure C6.1 and Table C6.3 present a summary of the Ilam Typically 13.7m to 18.2m (Avg 16.3m) Typically 1.4m to 4.1m (Avg 2.6m) sands and silts. property-by-property rapid mapping of liquefaction and lateral spread observations in this area. The observations Table C6.2 summarises typical ground elevation and Table C6.3 - Summary of liquefaction and lateral spread observations for residential land, aggregated following the 4 September 2010 and 22 February 2011 groundwater depths in the area (the values listed correspond from mapping undertaken following earthquakes of 4 September 2010 and 22 February 2011 to the 10th and 90th percentiles and the median). This was earthquakes have been aggregated by assigning each derived from LiDAR ground elevation survey commissioned property the most severe observation from either of by EQC in September 2011, and a groundwater surface these two earthquakes. These observed liquefaction and developed from recent EQC groundwater monitoring lateral spread mapping colours have completely different in conjunction with historic Environment Canterbury meaning to the colour codes used by the Canterbury groundwater data. This area is generally elevated well above Earthquake Recovery Authority (Cera) for residential land sea level with a shallow to moderate depth to groundwater. zoning and the Department of Building and Housing (DBH) for technical categories. The ground conditions and groundwater in this area are Suburb generally similar to most of the southern, central and

Table C6.4 summarises the change in ground elevation 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 northern suburbs of . inferred from the LiDAR survey. The total change in ground Bishopdale 3680 28% 48% 13% 11% 0% <1% 0% elevation which has occurred is a combination of regional While ground surface disturbance has occurred in some Bryndwr 3010 29% 49% 2% 19% 0% 1% 0% uplift or subsidence due to fault movements (tectonics) areas (e.g. settlement, cracking and ejection of material), Burnside 2247 94% 6% 0% <1% 0% <1% 0% the underlying ground which liquefied appears to have now and local ground subsidence due to liquefaction and related Fendalton 2699 2% 46% 5% 36% <1% 10% <1% returned to its pre-earthquake strength. effects. The LiDAR is of limited accuracy (about ±100mm). This means that the LiDAR is more suitable for measuring Ilam 2335 73% 25% <1% 1% <1% <1% 0% 6.2 Post-earthquake observations large changes in ground elevation (greater than about 100 Rapid mapping of liquefaction and lateral spreading to 200mm), and may not accurately represent areas where observations was undertaken following the 4 September Table C6.4 - Changes in ground elevation inferred from LiDAR survey only minor changes in ground elevation have occurred. 2010 and 22 February 2011 earthquakes, first on a regional Suburb Change in ground elevation from July 2003 to September 2011 and street-by-street level in the days immediately after Table C6.5 summarises the extent and severity of observed (positive values are uplift, negative values are subsidence) liquefaction and lateral spread. each earthquake, and then on a property-by-property level Bishopdale Typically -400mm to -150mm (Average -250mm)

Bryndwr Typically -350mm to -150mm (Average -250mm) Table C6.1 - Area-wide geotechnical investigations undertaken by EQC (December 2011) Burnside Typically -250mm to +0mm (Average -150mm) Suburb Number of cone Number of Number of groundwater Length of MASW penetration tests boreholes standpipes geophysical testing (m) Fendalton Typically -400mm to -100mm (Average -250mm) Bishopdale 9 - 6 - Ilam Typically -100mm to +50mm (Average +0mm)

Bryndwr 14 2 8 -

Burnside - - - -

Fendalton 26 7 14 -

Ilam - - - -

ENVIRONMENTAL AND ENGINEERING CONSULTANTS EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012 80

Factsheet 6 - Ilam to Bishopdale Bishopdale, Bryndwr, Burnside, Fendalton and Ilam

Table C6.5 - 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 Bishopdale Minor to moderate liquefaction in several areas, causing sand ejection and settlement. Bryndwr In the surrounding areas, settlement and minor ground cracking observed without any obvious surface evidence of liquefaction, likely due to minor liquefaction occurring at depth below the surface but not SAWYERS ARMS ROAD ATSONS ROAD being ejected. W Casebrook TUCKERS ROAD

GLASNEVIN DRIVE HIGHSTED ROAD For the remainder of the suburb, no surface evidence of liquefaction or related land effects was observed. HAREWOOD ROAD

CAVENDISH ROAD

Burnside Most of this suburb was not mapped at a property-by-property level, however street-level mapping and AINTREE STREET GARDINERS ROAD VEITCHES ROAD CROFTON ROAD air photo analysis found no surface evidence of liquefaction or related land effects. OLDWOOD STREET Northcote PADDINGTON STREET

Fendalton Extensive areas of minor to moderate liquefaction (severe liquefaction on a small number of properties), NORTHCOTE ROAD

IAN PLACE

COTSWOLDAVENUE causing sand ejection and settlement. WOOLDRIDGE ROAD

Moderate to major lateral spreading towards streams and watercourses in many areas, but generally HIGHSTED ROAD VAGUES ROAD localised to the immediately adjacent properties. TRAFFORD STREET BECMEAD DRIVE

SKYEDALE DRIVE For the remainder of the suburb, no surface evidence of liquefaction or related land effects was observed. BAINTON STREET SAWYERS ARMS ROAD Bishopdale PRIMROSE STREET

RALEIGH STREET OAKLAND STREET Ilam Minor to moderate liquefaction in several small localised areas, causing sand ejection and settlement. ISLEWORTH ROAD BREENS ROAD EASTLING STREET

Localised moderate lateral spreading on a small number of properties beside Waimairi Stream. ABROS PLACE LEO STREET MORRISON AVENUE

Most of this suburb was not mapped at a property-by-property level, however street-level mapping LANGDONS ROAD HOANI STREET Papanui and air photo analysis found no surface evidence of liquefaction or related land effects across the rest MORELAND AVENUE of the suburb. FARRINGTON AVENUE

MAPLE STREET GREERS ROAD

For further area-wide geotechnical information, refer to the technical data reports MARY STREET Linwood, North Linwood, Opawa, Phillipstown, St Martins, Waltham & Woolston MAIN NORTH ROAD on the EQC website, at http://canterbury.eqc.govt.nz/news/reports MOORAY AVENUE HARRIS CRESCENT

BRENT PLACE

CHARLCOTT STREET SAFFRON STREET KENDAL AVENUE BLANCH STREET MATSONS AVENUE ST JAMES AVENUE DUNSTER STREET WINDERMERE ROAD PAPANUI ROAD

WAIRAKEI ROAD CE BELLVUE AVENUE Burnside CONDELL AVENUE

WAYSIDE AVENUE BLAIR AVENUE

AMBLESIDE DRIVE DERWENT STREET TORQUAY PLA BOUNTY STREET SPRINGBANK STREET JENNIFER STREET AORANGI ROAD WATFORD STREET GUILDFORD STREET BLIGHS ROAD

WESTHOLME STREET

Bryndwr COLWYN STREET URUNGA AVENUE

AORANGI ROAD LEES ROAD ALPHA AVENUE GRAHAMS ROAD

MORLEY STREET EVATT STREET ILAM ROAD BRYNDWR ROAD

GARREG ROAD NORMANS ROAD BRACO PLACE GALWAY AVENUE

STROWAN ROAD CLYDE ROAD PEEL STREET

HOUNSLOW STREET

IDRIS ROAD

LONGMUIR STREET RYELAND AVENUE ILAM ROAD JEFFREYS ROAD

WAIMAIRI ROAD

MEMORIAL AVENUE GLANDOVEY ROAD

TUDORAVENUE GLANDOVEY ROAD

WROXTON TERRACE

Ilam HAMILTON AVENUEOTARA STREET GARDEN ROAD WILFRID STREET

WAIWETU STREET Fendalton WADELEY ROAD Applicability - This report was prepared and/or compiled for the Earthquake Commission (EQC) to communicate information SOLWAYAVENUE CREYKE ROAD FENDALTON ROAD that may be relevant to residential land claims under the Earthquake Commission Act 1993. The report was not intended for DOVEDALE AVENUE any other purpose and may not be relied upon for any other purpose. EQC and its engineers, Tonkin & Taylor, have no liability TUI STREET 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 C6.1 - 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.

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