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Settlers Crescent - Ferrymead - wastewater repairs

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What
Installation of a new lift station and wastewater main replacement
When
Tuesday 29 October 2013 until February 2014
Where
Settlers Crescent, Ferrymead

This notice is an update for an earlier notice.

Where we are working

Location of works. Sourced from LINZ data, Crown Copyright reserved. Work area (purple): Tussock Lane and the part of Settlers Crescent which runs parallel to Ferry Road; Stage one and stage two work area (black): Settlers Crescent west; One way traffic for stage one and two (red dotted arrow): northwards from Settlers Crescent east to Ferry Road, alongside the stage one and two work area; Location of lift station (green disc): southern end of Settlers Crescent west; No turn available: From Ferry Road into western Settlers Crescent, and northwards from Settlers Crescent (west) into Ferry Road eastwards; Entry to Settlers Crescent: intersection of Ferry Road and Settlers Crescent east.

Sign up to receive regular updates about our work by emailing [email protected]

What we are doing

  • We will be replacing the gravity wastewater main and public wastewater laterals along Settlers Crescent and Tussock Lane. An underground wastewater lift station will also be constructed in the berm on the corner of Settlers Crescent, near number 4 Settlers Crescent.
  • There are several stages of this work. The first stage commences Tuesday 29 October 2013 at the western intersection of Settlers Crescent and Ferry Road and will take approximately two weeks. Stage two will then follow and will take approximately four weeks.
  • The work will involve different traffic management set ups. We will inform you of these changes as we progress through.
  • Stormwater repairs (near Tussock Lane), road stabilisation and kerb and channel repairs will follow after the wastewater repairs in early 2014. We will update you before this work starts.
  • The lift station will be below the ground with the only above ground features being a manhole cover and an electrical control cabinet. Please refer to the Frequently Asked Questions for more information on lift stations.
  • The construction of the lift station will involve excavating a hole approximately 5 metres deep to install the pumping equipment. This deep excavation will require dewatering and sheet piling. Sheet piles are long sections of steel, that interlock to form a continuous wall. Nearby residents may experience ground-borne noise and vibrations during the installation period.
  • Replacement of the gravity mains involves trenching in the middle of the road to remove damaged pipes and replacing these with new pipes. Open trenching will require the placement of trench shields and fencing to ensure our workers remain safe.
  • As part of this work we will be connecting your wastewater lateral to the newly replaced wastewater main in the street and we may need to work within your property to complete the connection. This will involve opening an inspection point inside your property approximately 1.0m by 1.0m to make the connection. We will notify you directly if work is required inside your property and advise you at least three days before we start work with a note in your letterbox. Your property will be fully reinstated once the work is complete.
  • Our plant and material container will be located in the vicinity.

How our work could impact you

Traffic Impacts

  • A one-way system will be in place at the west end of Settlers Crescent for the first two stages of this work. Entry to Settlers Crescent is at the eastern end of Ferry Road (refer map).
  • We will notify businesses prior to any traffic change during the stages of work.
  • To allow for the installation of the lift station the kerb will be widened. During the construction footpath access next to the work site will not be available. Please follow on-site signage.
  • Access to properties for emergency vehicles and deliveries will be maintained.
  • On-street parking will be affected during the work period. Please park outside of the immediate area of the worksite. Signage will indicate where parking will not be available.
  • Pedestrian and cycle access will be maintained.
  • The bus stops within the work area will be relocated to a temporary location. Details of the temporary bus stops will be available at the original bus stop location. Please refer to the Metro website www.metroinfo.co.nz or phone 366 8855 on the day of travel for any service changes.

General Impacts

  • We will be using construction machinery, pumps, concrete saws, compacting machines and other pieces of equipment as part of this work.
  • There will be increased noise, dust and vibration levels associated with this work, however this will be monitored and managed accordingly.
  • Works will take place between 7.00am and 6.00pm, Monday–Friday, with possible Saturday work.
  • All works are subject to favourable weather and on-site conditions. There will be no expected interruptions to your existing water, wastewater, power, gas or telecommunication services while we undertake this work.

Lift Stations
Frequently Asked Questions

Wastewater lift stations

  1. What are lift stations and how do they work?

    Lift stations are used to improve a gravity wastewater network. In a gravity wastewater network pipes are laid on a specific gradient, or slope, in order for the waste to flow in the right direction. A lift station is installed into a gravity wastewater system to create an intermediate high point to keep wastewater flowing in the right direction.

  2. Why are lift stations needed?

    Lift stations help to make a gravity wastewater network more resilient if there are any future earthquakes. When a lift station is installed gravity wastewater pipes can be laid shallower than normal and at steep gradients. Shallower pipes are easier to access if they need to be repaired in the future and are subjected to less pressure than deep pipes in an earthquake.

  3. What will lift stations look like?

    Once the lift stations are in place underground there will only be a manhole and small electrical control box visible. The depth of lift stations will vary, in general they will be around 4m deep and approximately 2.5m wide. The manhole lid will be around 60cm × 90cm.

  4. How are lift stations installed?

    Sheet piling is needed around the perimeter of the lift station, a trench will then be dug inside the sheet piles.

    To lower the water level in and around the trench, a dewatering pump and spears may be required. If needed, the dewatering pumps will run continuously until the work is completed.

    The chamber of the lift station will be installed. The wastewater pipes will be connected below ground to the lift station and then the surrounding area will be back-filled. The concrete foundation slab will be poured and the electrical system will be wired up.

Diagram of an underground wastewater lift station:
Please note: diagram is not to scale, for illustration purposes only. Digram shows: A manhole will be visible above ground; Gravity wastewater pipe into the pump chamber; Submersed pump; Wet well chamber; and Pressure pipe out of the pump chamber.

An example of the sheet piling and equipment required to install a lift station:
Photo.

Site Office

The City Care site office will be located at Unit 4 Tussock Lane.

We are open to public enquiries every Friday 9.00–11.00am.

Feel free to come and meet the team and find out more about our work.

Contact the City Care Team

Phone:
0800 632 889
Email:
[email protected]
Web:
www.strongerchristchurch.govt.nz

Start date: 
Tue, 29/10/2013
End date: 
Sat, 08/02/2014
Project numbers: 
10897