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Mt Eden Ground Investigation Updates

Mt Eden Ground InvestigationS - Updates

 

This page gives you the background to the geotechnical investigations in the rail corridor followed by updates.

Ground investigations are being conducted in various locations, both inside and outside the rail corridor, to assist CRL engineers with the design of the physical structures needed to connect the new CRL line with the existing Western Line track.

These are taking place between Boston Road and Haultain Street.

The work involves drilling boreholes and undertaking cone penetration testing (CPT) to better understand ground conditions. The results will assist CRL engineers with the design of the physical structures that are needed to connect the new CRL line with the existing Western Line track at Mt Eden.

RIG: This compact drilling rig is one of the machines used for geotechnical investigations in Mt Eden

Pot-holing will also be carried out to enable us to accurately survey the positions of underground utility services before CRL track works begin on the Western Line.

This work involves the creation of a small trench using a hydraulic excavator or hydro-excavation unit to expose the existing utilities. It will take about two to four hours per location, depending on the size of the trench required.  

QUESTIONS?

The investigations are being undertaken by Aurecon and specialist drilling company Drill Force. If you have any questions or concerns, please feel free to contact Steve Temple, Senior Project Manager, Aurecon

021 686 764 steve.temple@aurecongroup.com


UPDATES

Ground Investigations June 10th to 20th 2019

Note: The following is an update to the notification below:

Due to inclement weather causing delays to City Rail Link ground investigation works in Normanby and Boston Roads, it is likely that the proposed start dates for ground investigation works in Porters Avenue and Haultain and Fenton Streets will now be pushed out by a couple of days.

The works were due to start in your area next Monday (10 June) but it is likely to be Wednesday when our contractors are on site and traffic management is in place. Apologies for any inconvenience caused by this delay.

This is to notify you of ground investigations that need to be undertaken on Porters Avenue, Haultain Street and Fenton Street.

The investigations are being undertaken by Aurecon and its sub-contractors - specialist drilling company Drill Force and physical works contractor Libbet - on behalf of the City Rail Link (CRL) project.

What is going to happen and why?

The work involves:

  • drilling boreholes to recover rock and soil samples

  • Cone Penetration Tests (CPTs) to understand soil properties

  • Excavating trenches to accurately locate existing utilities (gas, power, telecommunications, etc).

    The results will enable CRL engineers to design some of the early physical structures that are needed to connect the new CRL line with the existing Western Line track at Mt Eden.

    The borehole work involves:

    1. Pre-drill: excavation work using hydro-excavation (a water blaster and a vacuum truck) to clear underground services. This work will be undertaken by Libbet. At completion, a temporary steel plate will be installed over the excavation site.

    2. Drilling: borehole drilling to recover rock and soil samples and in-situ testing within the borehole itself. This work will be undertaken by Drill Force.

    3. Reinstatement upon completion. This will be undertaken by Libbet.

    The CPT process involves:

    1. Pre-drill: excavation work using hydro-excavation (a water blaster and a vacuum truck) to clear underground services. This work will be undertaken by Libbet. At completion, a temporary steel plate will be installed over the excavation site.

    2. Cone Penetration Testing (CPT): testing will be undertaken by pushing a series of metal rods with a cone on the end into the ground at a constant rate to measure the resistance of the underlying ground and to determine its properties. This work will be undertaken by Drill Force.

    3. Reinstatement upon completion. This will be undertaken by Libbet.

    The trench process involves:

    1. Removal of surface layer: vegetation removal or concrete cutting and hand excavation of the surface layer. This work will be undertaken by Libbet.

    2. Trench excavation: excavation of one to two-metre-deep trenches using hydro-excavation to define the exact location of existing underground services. This work will be undertaken by Libbet and its sub- contractor.

Reinstatement upon completion: the trench will be backfilled and a temporary surface applied. The permanent surface will be installed within a couple of days of the trench being completed. This will be undertaken by Libbet.

When will this work take place?

This work is expected to take place in different locations around Porters, Haultain and Fenton between the 10th and 20th of June. The hours of work are 7:00am to 7:00pm, Monday to Friday (with the possibility of Saturday work, if required) with an expected one to three days of work in each location.

The target dates for each of the areas, and the associated traffic management arrangements, are shown on each of the attached plans. The blue hatched areas on the maps show the work locations and the adjacent yellow areas show the locations subject to traffic management and temporary parking removal.

How will this affect you?

While the investigations are underway, affected roads will be reduced to one traffic lane for the duration of each working day, as they are being undertaken in the road corridor. Manual Stop-Go traffic management will be in place during work hours to safely manage vehicle movements.

During the period that traffic management is in place, the speed environment will be reduced to 30km/h. Outside of working hours, a temporary steel plate will be placed over the investigation locations to enable traffic to use both sides of the road. However, the speed reduction will remain due to the road surface being uneven.

In some locations, the borehole and trench investigation crews will be working within areas containing on-street parking and so it is likely that several on-street carparks will be unavailable for up to three days at a time. The CPTs in each location will be relatively quick – taking about 1 hour in each location.

Aspects of the work, such as hydro-excavation and drilling in-situ testing, will create some noise and vibration.

These works will not affect property access. However, some on-street parking and footpath facilities will be affected by the works. Pedestrians may need to take a short diversion during the period that traffic management is in place. Pedestrian management will be in place to direct pedestrians.

Who can I contact for more information about the investigation works?

Steve Temple, Senior Project Manager, Aurecon
T: 021 686 764
E: steve.temple@aurecongroup.com


24 May 2019

Future Vector work

Vector will be installing a feeder cable along New North Rd – starting from Central Rd in Kingsland to Ngahura St in Mt Eden.

The purpose of this cable is to provide a power supply for CRL’s tunnel boring machine for tunnelling between Mt Eden station and Aotea station. The cable will also provide a permanent power supply to the Mt Eden station.

Vector will give an update shortly on when works will start – although they are scheduled be completed by December 2019.

The feeder cable is a Vector asset, and they will project manage these works. Vector will send out notifications to affected stakeholders shortly. If you have any queries on this, please contact Vector directly –  0508 832 867.

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