TC3 drilling plan

Posted 16 Jun 2012 by stalbanscommunity Popular
Posted in EQR , Rebuild , Suburbs , TC3
This item was posted on the St Albans Community website - click here to view the original


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

At this stage, we are expecting the drilling in the eastern suburbs to be finished in the next six to nine months. Further announcements around timeframes for the remaining western and southern suburbs will be made when we have a clearer picture of the resources available.

Testing will not necessarily 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:

Information on this page:


Suburb-by-suburb list for TC3 geotechnical investigations

Areas in Progress

North New Brighton
New Brighton
Waimairi Beach


Next to be assigned

These suburbs will be drilled one suburb at a time, in the order below. As each suburb is completed we will update the list to include a list of suburbs completed. 

St Albans

Drilling in suburbs in the following two lists will start simultaneously (ie. drilling at Burwood and Redcliffs will commence simultaneously). Given that some suburbs are larger than others the drilling will not be exactly in parallel. We will update this list as suburbs are completed.

Burwood Redcliffs
Avondale Southshore
Avonside St Martins
Dallington Opawa
Linwood Sydenham
Bromley Woolston
Spencerville Waltham
Kaiapoi Tai Tapu
Belfast Halswell River
Casebrook Spreydon
Central City Addington
Merivale Cashmere
Redwood Halswell
Strowan Hoon Hay



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 853KB) for more information about the drilling process what you can expect as a property owner.


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