What next after the 2nd Geotech report – Zone B Processes

The main report contains outlines on the processes to be followed in remediating land according the zone in which a property is located. These are reproduced below:

Zone B is Chaddesden Lane, Cowlishaw Street and Patten Street
2.2 Zone B
Zone B land has mostly suffered some land damage as a result of liquefaction. T&T engineers consider that this land has now mostly returned to its pre-earthquake strength, although the ground surface may be disturbed and require minor surface levelling and compaction. EQC will generally cover the cost of this surface remediation work.
2.2.1 Process
• Cracks located on accessible land should be filled with sand or gravel (depending on crack width) and the land should be lightly compacted with a plate compactor or small roller. Additional works may be required where cracks or significant volumes of ejected sand are present beneath dwellings.
• Necessary land and building work can begin now in accordance with council consent requirements. In cases where foundation repair or rebuilding works require consents, the suburb wide geotechnical reports will assist in providing engineering guidance.
• Repair building on existing foundations (provided they are undamaged and level), or
• Evaluate the practicality of re-levelling or repairing damaged foundations, and repair wherever economically practical, or
• Demolish and rebuild where re-levelling or repair is not economically practical. Rebuild on new foundations, in accordance with council consent requirements, subject to simple shallow soil testing to confirm that the upper ground surface provides sufficient bearing capacity in terms of NZS 3604.
2.2.2 Programme outline
The programme of building repair works will be coordinated by the Fletcher Construction Company for EQC claims under $100,000 plus GST. Building repair and rebuilding works for claims over $100,000 plus GST will be arranged through the private residential insurance companies.
A flowchart demonstrating the indicative programme is provided in Figure 5.2 (page 13).

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