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. ! 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 Aranui 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 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 Westmorland 6 Bryndwr 10 Middleton Bishopdale Ilam Hillmorton Burnside UpperRiccarton Oaklands 14 Avonhead Westlake Sockburn Hyde Park Tai Masham WentworthPark Russley HeiHei Harewood Hornby 15 1:100,000 RiccartonPark Islington 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 97

Factsheet 15 - Tai Tapu to Halswell , Lincoln and Tai Tapu

level mapping for the subsequent main earthquakes. 15.1 Ground conditions and groundwater Table C15.2 - Summary of ground elevation and groundwater depth (March 2011) Regional geology maps show this area is generally underlain This additional mapping indicated that the pattern of Suburb Ground elevation above sea level Groundwater depth by river alluvium beneath plains or low level terraces of liquefaction and lateral spreading for the subsequent Holocene age. earthquakes was generally similar to that observed in the Halswell River Typically 4.8m to 8.8m (Avg 6.5m) Typically 0.7m to 1.3m (Avg 1.0m) first main earthquake, but less extensive and severe. Lincoln Typically 9.1m to 13.4m (Avg 11.3) Typically 2.0m to 4.0m (Avg 3.0) Table C15.1 summarises the area-wide subsurface ground Tai Tapu Typically 6.4m to 7.0m (Avg 6.7m) Typically 0.7m to 1.3m (Avg 1.0m) investigations undertaken by EQC in this area following the Figure C15.1 and Table C15.3 present a summary of the 4 September 2010 earthquake. These investigations indicate property-by-property rapid mapping of liquefaction and that the near-surface soil profile in the area generally lateral spread observations undertaken by EQC in this Table C15.3 - Summary of liquefaction and lateral spread observations for residential land, comprises very loose to dense sands, gravels, silts and clays. area. The mapping undertaken by EQC was predominantly aggregated from mapping undertaken by EQC following earthquake of 4 September 2010 of the main urban areas of Lincoln and Tai Tapu, with less Table C15.2 summarises typical ground elevation and detail in the surrounding rural areas. For more extensive groundwater depths in the area (the values listed correspond and detailed mapping of liquefaction observations in these to the 10th and 90th percentiles and the median). This was rural areas, refer to the post-earthquake liquefaction report derived from LiDAR ground elevation survey commissioned commissioned by the Council, available at by the Ministry of Civil Defence and Emergency Management http://www.selwyn.govt.nz/services/building/earthquake- in March 2011, and a groundwater surface developed from building-recovery/liquefaction-report. These observed historic Environment Canterbury groundwater data. This area liquefaction and lateral spread mapping colours have Suburb is generally elevated moderately well above sea level with a

completely different meaning to the colour codes used by 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 to major lateral Moderate quantities or large spreading of ejected material spreading, lateral Severe often ejected material observed shallow to moderate depth to groundwater. the Canterbury Earthquake Recovery Authority (Cera) for Halswell River 391 61% 17% 0% 22% 0% 0%

The ground conditions and groundwater in this area are residential land zoning and the Department of Building and Lincoln 1168 <1% 99% 0% 0% 0% 0% generally similar to, or slightly more favourable than, most of Housing (DBH) for technical categories. Tai Tapu 174 3% 90% 0% 7% 0% 0% the southern, central and northern suburbs of Table C15.4 summarises the change in ground elevation While ground surface disturbance has occurred in some inferred from the LiDAR survey. The total change in ground Table C15.4 - Changes in ground elevation inferred from LiDAR survey areas (e.g. settlement, cracking and ejection of material), elevation which has occurred is a combination of regional Suburb Change in ground elevation from February 2008 to March 2011 the underlying ground which liquefied appears to have now uplift or subsidence due to fault movements (tectonics) (positive values are uplift, negative values are subsidence) returned to its pre-earthquake strength. and local ground subsidence due to liquefaction and related Halswell River Typically -200mm to +50mm (Average -100mm) effects. The LiDAR is of limited accuracy (about ±100mm). 15.2 Post-earthquake observations This means that the LiDAR is more suitable for measuring Lincoln No data (beyond extent of pre-earthquake LiDAR coverage) Rapid mapping of liquefaction and lateral spreading large changes in ground elevation (greater than about 100 Tai Tapu Typically -200mm to +0mm (Average -150mm) observations was undertaken following the 4 September to 200mm), and may not accurately represent areas where 2010 earthquake, first on a regional and street-by-street only minor changes in ground elevation have occurred. level in the days immediately after the earthquake, and then on a property-by-property level in urban areas over the Table C15.5 summarises the extent and severity of observed following weeks. This mapping was supported by regional- liquefaction and lateral spread.

Table C15.1 - 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) Halswell River - - - -

Lincoln - - - -

Tai Tapu 7 - - -

ENVIRONMENTAL AND ENGINEERING CONSULTANTS EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012 98

Factsheet 15 - Tai Tapu to Halswell Halswell River, Lincoln and Tai Tapu

Table C15.5 - Liquefaction and lateral spread observations Unmapped, no observations (uncoloured) No lateral spreading but minor to moderate quantities of ejected material No observed ground cracking or ejected liquefied material Moderate to major lateral spreading or large quantities of ejected material Suburb Observations Minor ground cracking but no observed ejected liquefied material Severe lateral spreading; ejected material often observed Territorial Authority suburb boundary Halswell River Minor to moderate liquefaction in many rural areas alongside the Halswell River and other watercourses, causing sand ejection and settlement. Minor lateral spreading in some localised areas alongside the Halswell River. LEADLEYS ROAD For the remainder of the area, no surface evidence of liquefaction or related land effects was observed.

Lincoln No surface evidence of liquefaction or related land effects observed.

Tai Tapu Minor to moderate liquefaction in several small areas, causing sand ejection and settlement. For the remainder of the urban area, no surface evidence of liquefaction or related land effects was observed. ROBINSONS ROAD MCDRURYS ROAD

SPRINGS ROAD For further area-wide geotechnical information, refer to the technical data reports BIRCHS ROAD on the EQC website, at http://canterbury.eqc.govt.nz/news/reports ROADTAPU OLDTAI HAYES ROAD

OSTERHOLTS ROAD OSBORN ROAD

HOLMES ROAD BARNES ROAD

BOUNDARY ROAD SETTLEMENT ROADTANCREDS ROAD TAI TAPU ROAD

Linwood, North Linwood, Opawa, Phillipstown, St Martins, WalthamVOSS ROAD & Woolston

NORTH BELT Lincoln

GERALD STREET EDWARD STREET

SOUTH BELT

RAINEYS ROAD

MEYER ROAD

BARNES ROAD

PERYMANS ROAD MOIRS LANE RHODES ROAD

LINCOLN TAI TAPU ROAD

COLLINS ROAD ELLESMERE ROAD

POPLAR LANE COLLINS ROAD EAST

WARDSTAY ROAD SCHOOL ROAD Tai Tapu

DAVIS ROAD

HUDSONS ROAD

MCDONALD ROAD CHRISTCHURCH ROAD GILMOURS ROAD

ENGLISHS ROAD

CARTERS ROAD RIVER ROAD

GREENPARK ROAD 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 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 C15.1 - Overview of liquefaction and lateral spreading observations, from mapping undertaken following the information is not intended to form a complete technical report on land changes in all or any part of Canterbury. earthquake of 4 September 2010.

ENVIRONMENTAL AND ENGINEERING CONSULTANTS