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 Redcliffs FIGURENo. Bexley 9 Lyttelton DiamondHarbour MtPleasant North New Brighton 1:100,000 New Brighton PinesBeach KairakiBeach MoncksSpur Aranui Ferrymead 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 Avonside Huntsbury Opawa Ouruhia Shirley Waltham StMartins North Kaiapoi Chaneys Richmond 1 Phillipstown Marshland Kaiapoi Lakes South Kaiapoi GovernorsBay Bridgend Beckenham Mairehau 7 St Albans St Belfast Sydenham 11 Central City Cashmere Redwood 4 Spreydon Papanui Merivale Somerfield Addington Styx Northcote Casebrook Hoon HayValley Riccarton Location Plan Fendalton Hoon Hay Westmorland 6 Bryndwr 10 Middleton Bishopdale Ilam Hillmorton Burnside UpperRiccarton Halswell Oaklands 14 Avonhead 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 81
Factsheet 7 - Merivale to Mairehau Central City, Mairehau, Merivale, Papanui and St Albans
each earthquake, and then on a property-by-property level 7.1 Ground conditions and groundwater Table C7.2 - Summary of ground elevation and groundwater depth (February 2012) Regional geology maps show this area is generally underlain over the following weeks. This mapping was supported by air- by dominantly alluvial sand and silt overbank deposits. photo analysis for all four main earthquakes, and additional Suburb Ground elevation above sea level Groundwater depth Towards the northwest of the area, peat, silt and sand are regional or street-level mapping for the earthquakes of Central City Typically 4.2m to 7.2m (Avg 5.7m) Typically 0.3m to 2.9m (Avg 1.2m) present in existing or drained swamps 13 June 2011 and 23 December 2011. This additional mapping Mairehau Typically 5.7m to 6.5m (Avg 6.2m) Typically 0.9m to 1.6m (Avg 1.2m) indicated that the overall pattern of liquefaction and lateral Table C7.1 summarises the area-wide subsurface ground Merivale Typically 7.5m to 10.0m (Avg 9.0m) Typically 0.4m to 1.9m (Avg 1.3m) spreading for the subsequent earthquakes was generally investigations undertaken by EQC in this area following similar to that observed in the first two main earthquakes. Papanui Typically 9.1m to 15.5m (Avg 12.2m) Typically 0.3m to 2.9m (Avg 1.5m) the 4 September 2010 and 22 February 2011 earthquakes. St Albans Typically 4.8m to 8.6m (Avg 6.4m) Typically 0.3m to 1.7m (Avg 0.9m) These investigations indicate that the near-surface soil Figure C7.1 and Table C7.3 present a summary of the profile in the area generally comprises very loose to dense property-by-property rapid mapping of liquefaction and sands and silts. lateral spread observations in this area. The observations Table C7.3 - Summary of liquefaction and lateral spread observations for residential land, aggregated from mapping undertaken following earthquakes of 4 September 2010 and 22 February 2011 Table C7.2 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 February 2012, 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 in conjunction with historic Environment Canterbury Earthquake Recovery Authority (Cera) for residential land groundwater data. This area is generally elevated moderately zoning and the Department of Building and Housing (DBH) to well above sea level with a shallow depth to groundwater. for technical categories. Suburb
The ground conditions and groundwater in this area are Table C7.4 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 generally similar to most of the southern, central and inferred from the LiDAR survey. The total change in ground Central City 3081 <1% 37% 6% 47% 4% 5% <1%% northern suburbs of Christchurch. elevation which has occurred is a combination of regional Mairehau 946 1% 86% 1% 12% 0% 0% 0%
While ground surface disturbance has occurred in some uplift or subsidence due to fault movements (tectonics) Merivale 1823 <1% 31% 2% 63% <1% 3% <1%% and local ground subsidence due to liquefaction and related areas (e.g. settlement, cracking and ejection of material), Papanui 4628 4% 76% 4% 16% <1% <1%% 0% the underlying ground which liquefied appears to have now effects. The LiDAR is of limited accuracy (about ±100mm). St Albans 8595 <1% 24% 2% 65% 7% 2% <1%% returned to its pre-earthquake strength. This means that the LiDAR is more suitable for measuring large changes in ground elevation (greater than about 100 to 7.2 Post-earthquake observations 200mm), and may not accurately represent areas where only Rapid mapping of liquefaction and lateral spreading Table C7.4 - Changes in ground elevation inferred from LiDAR survey minor changes in ground elevation have occurred. observations was undertaken following the 4 September Suburb Change in ground elevation from July 2003 to February 2012 2010 and 22 February 2011 earthquakes, first on a regional Table C7.5 summarises the extent and severity of observed (positive values are uplift, negative values are subsidence) and street-by-street level in the days immediately after liquefaction and lateral spread. Central City Typically -550mm to -150mm (Average -300mm)
Mairehau Typically -400mm to -100mm (Average -300mm) Table C7.1 - Area-wide geotechnical investigations undertaken by EQC (December 2011) Merivale Typically -500mm to -200mm (Average -300mm) Suburb Number of cone Number of Number of groundwater Length of MASW penetration tests boreholes standpipes geophysical testing (m) Papanui Typically -400mm to -150mm (Average -250mm) Central City 15 - 6 - St Albans Typically -500mm to -250mm (Average -350mm)
Mairehau - - - -
Merivale 19 6 5 -
Papanui 17 1 8 -
St Albans 72 7 22 -
ENVIRONMENTAL AND ENGINEERING CONSULTANTS EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012 82
Factsheet 7 - Merivale to Mairehau Central City, Mairehau, Merivale, Papanui and St Albans
Table C7.5 - 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 Central City Extensive areas of minor to moderate liquefaction (severe liquefaction on a small number of properties), VAGUES ROAD Merivale causing sand ejection and settlement. WINTERS ROAD SAWYERS ARMS ROAD QUEEN ELIZABETH II DRIVE
Moderate to major lateral spreading towards the Avon River in many areas (severe spreading on a small MEADOW STREET number of properties) - generally localised to the immediately adjacent properties in Merivale, but APOLLO PLACE
becoming more extensive in Central City. SHEARER AVENUE For the remainder of the suburb (localised areas away from waterways), no surface evidence of Papanui liquefaction or related land effects was observed. GRASSMERE STREET PHILPOTTS ROAD
CRANFORD STREET Mairehau HOLIDAY DRIVE Mairehau Minor to moderate liquefaction in several areas, causing sand ejection and settlement. Severe BRONWYN STREET BRIGGS ROAD Papanui liquefaction or moderate lateral spread on a small number of properties near waterways. PROCTOR STREET MARY STREET MANUKA STREET CROZIERS ROAD In the surrounding areas, settlement and minor ground cracking observed without any obvious surface MAIN NORTH ROAD HILLS ROAD evidence of liquefaction, likely due to minor liquefaction occurring at depth below the surface but not KELLYS ROAD being ejected. MAHARS ROAD
RANGER STREET PAYLING LANE For the remainder of the suburb, no surface evidence of liquefaction or related land effects was observed. GRANTS ROAD JAMESON AVENUE NANCY AVENUE KENSINGTON AVENUE BELLVUE AVENUE FERGUSSON AVENUE St Albans Minor to moderate liquefaction across most of the suburb (severe liquefaction on some properties), ETHNE STREET BLAIR AVENUE PERRY STREET causing sand ejection and settlement. DORMER STREET PAPAROA STREET THAMES STREET RUTLANDMCFADDENS STREET ROAD Moderate to major lateral spreading towards St Albans Creek in some areas, but generally localised to BLIGHS ROAD BENNETT STREETNORFOLK STREET WESTON ROAD the immediately adjacent properties. WATFORD STREET TOMES ROAD JED LANE PAPANUI ROAD MAYS ROAD AYLESFORD STREET FLOCKTON STREET
For the remainder of the suburb (towards the north and southwest), no surface evidence of liquefaction KNOWLES STREET FRANCIS AVENUE or related land effects was observed. INNES ROAD URUNGA AVENUE MALVERN STREET DEE STREET FORFAR STREET Linwood, North Linwood, Opawa, Phillipstown, St Martins, WalthamWESTMINSTER STREET & Woolston For further area-wide geotechnical information, refer to the technical data reports CHAPTER STREETWESTON ROAD STREET RISELAW SOMME STREET
BROWNS ROAD on the EQC website, at http://canterbury.eqc.govt.nz/news/reports CIRCUIT STREET
NORMANS ROAD St Albans OXLEY AVENUE
STROWAN ROAD WINTON STREET PEEL STREET
DOVER STREET EDWARD AVENUE
WOODVILLE STREET WOODVILLE CLEVELAND STREET CLEVELAND DEVONPORT LANE HEATON STREET ST ALBANS STREET STREET GERALDINE HENDON STREET
BRISTOL STREET KINLOCH STREET LEINSTER ROAD
CHRISTCHURCH RAILWAY CYCLEWAY RAILWAY CHRISTCHURCH EDGEWARE ROAD
DOVER STREET AIKMANS ROAD STREET LINDSAY OFFICE ROAD STREET SLATER COX STREET
Merivale CHURCH LANE CANON STREET SPRINGFIELD ROAD SPRINGFIELD
ROSSALL STREET FULTON AVENUE HOLLY ROAD BERRY STREET
GARDEN ROAD SHERBORNE STREET SHERBORNE MERIVALE LANE CLARE ROAD
PURCHAS STREET CHAMPION STREET CHAMPION Fendalton HEWITTS ROAD ROAD CALEDONIAN QUEENS AVENUE DERBY STREET
CLIFFORDAVENUE PACKE STREET PACKE
DUBLIN STREET HELMORES LANE ANDOVER STREET PARK TERRACE BEALEY AVENUE
AMURI PARK LANE MADRAS STREET MADRAS FENDALTON ROAD MELROSE STREET STREET PERTH
CARLTON MILL ROAD COLOMBO STREET COLOMBO HARPER AVENUE
SALISBURY STREET
MANCHESTER STREET MANCHESTER ELY STREET ELY
MONA VALE AVENUE
DARVEL STREET MONTREAL STREET MONTREAL PETERBOROUGH STREET
KILMORE STREET BANGOR STREET
DEANSAVENUE BARBADOES STREET BARBADOES
ARMAGH STREET HANMER STREET HANMER
DURHAM STREET NORTH STREET DURHAM GRESSONS LANE RICCARTON ROAD SQUARE CRANMER GLOUCESTER STREET Applicability - This report was prepared and/or compiled for the Earthquake Commission (EQC) to communicate information that may be relevant to residential land claims under the Earthquake Commission Act 1993. The report was not intended for Central City WORCESTER STREET WORCESTER STREET 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 C7.1 - 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