TC3 drilling plan

Posted 23 Apr 2012 by GovtEQC Recommended Featured Popular
Posted in EQC , EQR , Land Information , TC3

The drilling plan for suburbs in Technical Category 3 (TC3) is below. Please note that this is subject to change. 

Testing will not necessarily take need to take place on every affected property in order to get adequate information for foundation design, and EQC has been working closely with both the Department of Building and Housing and local councils to ensure the onsite testing will meet building consent requirements.

If drilling is required on your property, EQC will contact you by phone to arrange and confirm the date when testing will occur.

For more information about the process for claims in TC3 see this section of our website:

See Technical Category Three (TC3) Investigations and Assessments undertaken by EQC (PDF 853KB) for more information about the drilling process and what you can expect as a property owner.


Geotechnical investigations in TC3

It is estimated that of the 27,000 homes in TC3, approximately 10,500 have foundation damage. Prior to the repair or replacement of foundations for homes in this category a geotechnical investigation is necessary in order to understand local soil conditions.

EQC is responsible for  geotechnical investigations of soil conditions in TC3 for homes under the EQC cap ($100,000+GST damage for a single event) and for those homes that have suffered foundation damage where cost has to be determined. For these customers this process is to determine whether EQC or your private insurer is responsible for your repair.

On-site investigation and off-site geotechnical analysis is required before data is loaded to the Cera Geotechnical Database for review by structural and geotechnical engineers.

Drilling is not necessary for every property with foundation damage. The drilling results gathered within your neighbourhood can  be used to provide an understanding of all neighboring properties. If drilling is required on your property, EQC will contact you by telephone to arrange the date when testing will occur can be done.

Find out about the drilling process

The factsheet TC3 Investigations and Assessments explains

  • detailed outline of the drilling process
  • why drilling is required
  • answers to common questions.

The timeframe

Drilling timeframe:  EQC’s drilling programme started in March 2012.  We expect drill investigations of all under cap properties to be completed by March 2013. We have prioritised suburbs by degree of damage and are drilling the most affected suburbs first.

Repair timeframe: Once drilling results are analysed and a repair method agreed your EQC claim may exceed the maximum EQC entitlement.  If this occurs you will be “paid the cap” and your repair/rebuild will be managed by your private insurer.

If your claim remains under the EQC cap your home will be repaired within the Canterbury Home Repair Programme (managed by Fletcher EQR).  The Canterbury Home Repair Programme commits to repair of all homes with damage between $50,000 and $100,000 in value by December 2013 and all homes with damage between $15,000 and $50,000 by the end of 2015.

Repairing foundations

The repair or rebuild of your foundations must meet Building and Housing standards guidelines and may require a building consent. A structural engineer will design your home's foundations if a building consent is required. This work comes under your building claim. 

For more information about the process for claims in TC3 see this section of our website:


Suburb-by-suburb list for TC3 geotechnical investigations

Areas in Progress

The drilling plan for suburbs in Technical Category 3 (TC3) is below. Please note that this is subject to change.


Expected start

Expected completion

North New Brighton March 2012 December 2012
Aranui May 2012 December 2012
Bexley May 2012 December 2012
New Brighton May 2012 December 2012
South New Brighton May 2012 December 2012
Parklands May 2012 January 2013
Waimairi Beach May 2012 January 2013
Queenspark May 2012 February 2013
Richmond May 2012 February 2013
Shirley June 2012 February 2013
Mairehau June 2012 February 2013
St Albans June 2012 February 2013
Edgeware June 2012 February 2013
Fendalton June 2012 February 2013
Riccarton June 2012 February 2013
Wainoni June 2012 February 2013
Burwood July 2012 February 2013
Avondale July 2012 March 2013
Avonside August 2012 March 2013
Dallington August 2012 March 2013
Recliffs August 2012 March 2013
Southshore August 2012 March 2013
St Martins August 2012 March 2013
Opawa August 2012 March 2013
Hillsborough August 2012 March 2013
Sydenham August 2012 March 2013
Woolston August 2012 March 2013
Waltham August 2012 March 2013
Phillipstown August 2012 March 2013
Cashmere August 2012 March 2013
Halswell August 2012 March 2013
Hoon Hay August 2012 March 2013
Hillmorton August 2012 March 2013
Spreydon August 2012 March 2013
Somerfield August 2012 March 2013
Beckenham August 2012 March 2013
Moncks Bay August 2012 March 2013
Brooklands September 2012 March 2013
Linwood September 2012 March 2013
Bromley September 2012 March 2013
Spencerville September 2012 March 2013
Kaiapoi September 2012 March 2013
Central City September 2012 March 2013
Merivale September 2012 March 2013
Strowan September 2012 March 2013
Casebrook September 2012 March 2013
Redwood September 2012 March 2013
Bishopdale September 2012 March 2013
Harewood September 2012 March 2013
Ilam September 2012 March 2013
Bryndwr September 2012 March 2013
Burnside September 2012 March 2013


'Marking out' in progress 


Expected start

Expected completion

Addington August 2012 March 2013
Belfast September 2012 March 2013
Northwood September 2012 March 2013


Next to be assigned


Expected start

Expected completion

Tai Tapu August 2012 March 2013
Lincoln August 2012 March 2013
Halswell River August 2012 March 2013
Kennedys Bush August 2012 March 2013



The testing process

Step 1: Marking out the drill site and service clearance

Testing will take place in an area of the property least likely to cause disruption. Our field staff will find a suitable location either in the front or back yard of your property, or directly in front of your property in the road way. A ground penetrating radar unit (approximately the size of a lawn mower) will be used to verify that no underground cables or pipes are present at the test location. To be doubly sure, the site will be revisited within a week by a cable locator to verify there are no cables present. Each visit will take around 10-20 minutes and should not be an inconvenience to you.

A wooden stake will be placed in the area where drilling will be undertaken.

It is imperative that you do not remove the wooden stake.

Step 2: Investigating your soil

Every endeavour will be made to undertake drilling on the roadside berm at no disruption to you. However in some cases we may need to investigate your property by using one of the following:

a) A Cone Penetration Test (CPT) - this provides very high quality geotechnical data. A drill rig will push a rod, around 20mm in diameter, into the ground to 20m below the ground surface. The rigs weigh a minimum of 2 tonnes and are either on tracks (like a digger) or wheels. A CPT test will gather data which allows for detailed analysis of how liquefiable your soil is.

b) A machine drilled borehole - these holes have a diameter of 100mm. Soil is extracted, boxed and sent to our lab for logging and testing. The hole will be backfilled with grout on the day of drilling completion.

Step 3: Reinstatement

Our field staff will reinstate your property either on the day or within three weeks of drilling. Photos taken before drilling will be referred to when ensuring your property is left in its original state.

Step 4: What happens to the data collection?

EQC will manage the soild sample data collected from each property through its Project Orbit platform. This web-based platform allows structural engineers, geotechnical engineers, surveyors and local council to review all data collected. Information will be used by specialists when considering the design of either new or repaired foundations to homes in TC3. Individual reports will not be sent to each TC3 property owner.

Approximately 6 - 8 weeks will pass before usable data is made available. This accounts for 4 weeks for mark-out and drilling; then a further 2 weeks for CPT data to be uploaded or 4 weeks for borehole data to be uploaded. If you are in the Canterbury Home Repair Programme (run by Fletcher EQR) repair will follow as soon possible. If you would like to review the data collected you will need to ask for this information from the structural engineer allocated to their repair.

Step 5: Repair of your home

You will be contacted by Fletcher EQR or your private insurer to discuss repair options for your home.

See Technical Category Three (TC3) Investigations and Assessments undertaken by EQC (PDF 410KB) for more information about the drilling process what you can expect as a property owner.




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