This dataset includes geotechnical reports available throughout Auckland Council systems. Geotechnical reports are written by suitably qualified and experienced geotechnical engineers or engineering geologists and include information on ground quality and subsurface geology. They are generally undertaken for infrastructure and building development or land use planningGeotechnical reports are received by council as part of consent applications, and are stored on the related property file. For each legacy council these records were located with the help of the document management team. Although spatial data was generated by property, the final database is not tagged to property parcels. Where feasible, detailed location polygons were generated using site maps available in the individual reports. In addition, some geotechnical reports are received by council for our own projects. These are also provided where available.This database was August 2020. All reports are available either on the Geotechnical Sharepoint or on ACCORD. Editing of this dataset can be done with the approval of Ross Roberts. geotechnical reports (i.e. tag them as Geotech and edit the GIS geometr, or a secondary process mayautomatically created property based geometry). Report data will be stored in OpenText/Accord, and will be flagged in SAPLineage: Data was extracted from legacy council databases sourced from:ACC/FDC Filenet ReportsNSCC Dataworks ReportsWCC Pathway ReportsRDC Pathway ReportsMCC Alchemy ReportsSAP Reports (2015-2019)ACGD Partner Reports (Watercare)These were evaluated to remove duplicate records, and associated with property records. Using property records a process was created for a one off load of the data (Geospatial team) using the property boundaries to create a base geometry. As one area may have several reports a separate related table was created to hold summary details of the reports. (Geotechnical Report Details)As some reports were not property based areas were manually digitised to indicate the extent of the report area.Future updates:As at this date the data is not yet updated - though it is intended that:The database will be updated whenever a new report is received. When a geotechnical report comes into council as part of a resource or building consent, the SAP team will need to follow the SAP protocol for In addition, new consent applications with geotechnical reports will be added, as will geotechnical reports undertaken for Auckland Council projects. Reports from other sources (e.g. CCOs, other crown entities) may be added where appropriate.

Detailed information about foundation requirements is available on the Ministry of Business, Innovation and Employment (MBIE)website.Technical category information is provided on behalf of the Ministry for Business, Innovation and Employment (MBIE) and was the best information available at the time of publication on Canterbury Maps in 2017. A technical category (1, 2 or 3) was assigned to residential properties on flat land in parts of Christchurch City, and Selwyn and Waimakariri districts by MBIE following the 2010/11 earthquakes. The technical categories were established to provide guidance on appropriate geotechnical assessments and foundation solutions for house repairs and reconstruction during the earthquake recovery. The technical categories were intended to have a limited life and were not intended to be updated over time. Details of any work done on an individual property since 2010 to reduce the liquefaction susceptibility of the land, or investigations that show the land meets the definition of another technical category, should be provided to prospective buyers, insurance companies or Christchurch City Council, Waimakariri District Council or Selwyn District Council.Published in the gazetted Land Use Recovery Plan 6/12/2013 https://cera.govt.nz/recovery-strategy/built-environment/land-use-recovery-planTechnical Category 1 (TC 1)Land that was classified Technical Category 1 (TC1) was suitable for homes to be repaired or rebuilt after the 2010/11 Canterbury earthquakes.TC1 land generally did not experience liquefaction-related land damage or settlement during the 2010/11 Canterbury earthquakes. Land damage from liquefaction is unlikely on TC1 land during significant future earthquakes. Standard foundations for concrete slabs or timber floors are considered adequate to address liquefaction hazard for house repairs and rebuilds on TC1 land, but normal consenting requirements still apply (e.g. to confirm suitable ground bearing strength and assess all other hazards).Technical Category 2 (TC 2)Land that was classified Technical Category 2 (TC2) was suitable for homes to be repaired or rebuilt after the 2010/11 Canterbury earthquakes. TC2 land may have experienced liquefaction-related land damage and settlement during the 2010/11 Canterbury earthquakes. Land damage from liquefaction is possible on TC2 land in future significant earthquakes. While TC2 land is considered suitable for residential construction, stronger foundations are required for house repairs and rebuilds. This may include standard timber piled foundations for houses with lightweight cladding and roofing and suspended timber floors or enhanced concrete foundations.Technical Category 3 (TC 3)TC3 land experienced liquefaction-related land damage and settlement during the 2010/11 Canterbury earthquakes. Land damage from liquefaction is possible on TC3 land in future significant earthquakes. While TC3 land is considered suitable for residential construction, site-specific geotechnical investigation and specific engineering foundation design are required for house repairs and rebuilds.There are no one-size-fits-all foundation solution for repairs or rebuilds on TC3 land. Site-specific geotechnical investigations will identify the best foundation for the repair or rebuild to reduce the risk of property damage or injury in future earthquakes. This may include deep foundation piles or ground improvement work.N/A - Port Hills & Banks PeninsulaProperties in parts of the Port Hills and Banks Peninsula have not been given a Technical Category. This is because properties in the hill areas have always required a site-specific foundation design and are not generally subject to liquefaction or lateral spread.Normal consenting procedures will apply in these areas.N/A - Rural & UnmappedProperties in rural areas or beyond the extent of land damage mapping, and properties in parts of the Port Hills and Banks Peninsula have not been given a Technical Category.Normal consenting procedures will apply in these areas.N/A - Urban NonresidentialTechnical Category not applicable means that non-residential properties in urban areas, properties in rural areas or beyond the extent of land damage mapping, and properties in the Port Hills and Banks Peninsula have not been given a Technical Category.Normal consenting procedures will apply in these areas.Red Zone (Port Hills)Red Zone (Port Hills) are areas where the threat to life from cliff collapse or rocks rolling downhill was considered unacceptable following the 2010/11 Canterbury earthquakes. The areas were defined by the Canterbury Earthquake Recovery Authority (CERA). The Crown offered to purchase properties in these areas from the owners, and the properties that were sold to the Crown are now administered by Land Information New Zealand (LINZ) and/or Christchurch City Council. You can find more information on the LINZ website LINZ website. Some properties were not sold to the Crown and in some cases the owners have subsequently installed mitigation works to reduce the cliff collapse or rockfall risk to an acceptable level. Details of any work done to reduce the cliff collapse or rockfall risk to individual properties should be provided to prospective buyers and insurers.Red Zone (Port Hills) areas within Christchurch City are now part of Christchurch City Council’s slope instability hazard management areas. You can find more information on these management areas in Chapter 5 of the Christchurch District Plan, and find more information on Port Hills slope stability on the Christchurch City Council website.Red Zone Christchurch & WaimakariThe Red Zone (Flat Land) areas are where the Crown offered to purchase properties from the owners after 2010/11 Canterbury earthquakes. The Government considered that making the land suitable to build on again and repairing roads and underground services in these areas would be very expensive and take a very long time. It gave property owners in these areas the option to sell their properties to the Crown so that they could resettle more quickly. The areas were defined by the Canterbury Earthquake Recovery Authority (CERA) and the properties that were sold to the Crown are now administered by Land Information New Zealand (LINZ). You can find more information on the LINZ website. Red zone flat land areas within Christchurch City are now part of Christchurch City Council’s Specific Purpose (Flat Land) Recovery Zone. You can find more information on this zone on the Christchurch District Plan.CCC Liquefaction & CERA InformationIn 2019 Christchurch City Council completed a liquefaction hazard study , encompassing the Christchurch urban area, which uses the extensive information about ground conditions gathered since the 2010/11 Canterbury earthquakes and follows the most recent national liquefaction guidance. This includes an updated liquefaction vulnerability map, and an online tool which helps to visualise an area’s vulnerability to liquefaction under different conditions. For details visit the CCC liquefaction information website. You can find out more information about the inherited responsibilities of the Canterbury Earthquake Recovery Authority (CERA) on the Department of the Prime Minister and Cabinet website.