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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

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


23 January 2019

Ground investigation works on Porters Avenue and Wynyard Road

Geotechnical investigations need to be undertaken in Porters Avenue/Wynyard Road on either side of the rail crossing at the end of this month. 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.

Mt Eden work  map 24 January 2019.JPG

What is going to happen and why? The work involves the drilling of two boreholes on Porters Avenue – the first outside Kennards and the second outside No. 5 Porters Ave (physically located at the end of Wynyard Road) - to recover rock and soil samples. 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.

The works consists of the following:

  • Pre-drill: excavation work using hydroexcavation (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.

  • 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.

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

When will this work take place? This work is expected to take place over about eight days from 29 January 2019, between the hours of 7am and 7pm.

How will this affect people? The western side of Porters Avenue and Wynyard Road, closest to Kennards and No.5 Porters Ave, needs to be closed to traffic while work is taking place between 7am and 7pm, as they are being undertaken within the road corridor. The other (eastern) side of Porters Avenue, closest to Mt Eden Station, will remain open but manual StopGo traffic management will be in place during work hours to safely manage vehicle movements. A traffic controller will be in place on both side of Porters Avenue during work areas. 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 borehole location to enable traffic to use both sides of the road. However, the speed reduction will remain due to the road surface being uneven.

Aspects of the work – such as hydro-excavation and in-situ testing - will create some noise but this isn’t expected to cause too much disturbance to surrounding properties. 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.

What else is coming up? Further ground investigations, including ‘pot-holing’ to confirm the exact locations of underground utility services, are likely to be undertaken in the near future. Pot-holing involves the creation of a small trench using a hydraulic excavator or hydro-excavation unit to expose the existing utilities. This enables us to accurately survey their positions before CRL track works begin on the Western Line. It will take about two to four hours per location, depending on the size of the trench required.


21 December 2018

Ground investigation work in the rail corridor - 27 December 2018 to 5 January 2019

What is going to happen and why?

Geotechnical investigations are planned in the rail corridor at Mt Eden over the Christmas break. 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.

When will the work take place?

These works are scheduled to take place between 7am and 6pm, from Thursday 27 December to Saturday 5 January. For safety reasons, the ground investigations are timed to coincide with KiwiRail’s Christmas/New Year maintenance schedule, when the rail line will be closed to trains and overhead electrified wires turned off.

Where is it happening?

The ground investigations are taking place within the rail corridor at various locations, from just east of the Normanby Road rail crossing to the Mt Eden Station side of Porters Avenue.

How will this affect me?

Aspects of the work have the potential to create noise. However, our crew will only be working at each location for a short period of time and the noise generated is not expected to cause much disturbance to surrounding properties.

The boreholes will take approximately two days at each location and the CPT approximately one hour.

These works will not affect access, traffic or parking in your area.