City Rail Link. Ground Investigation CRL

Transcription

1 Ground Investigation Ground investigation has been undertaken along the proposed CRL route to better understand what lies beneath the city where the tunnels and stations will be built. The information helps determine construction techniques. A total of 127 cored boreholes will be drilled by the end of 2014 Each borehole drills a 96mm diameter hole and provides a 61mm diameter sample The boreholes range in depth from six to 63 metres, (more than five buses end to end) below the existing ground level A total of 3,008m of core will be recovered. If the core was laid end to end it would cross the Auckland Harbour Bridge three times Each borehole has instrumentation to monitor groundwater

2 Groundwater Monitoring As part of the ground investigation work, instrumentation has been installed in the boreholes to allow us to understand the groundwater network under the alignment and surrounding areas. This information informs the design of the stations and tunnels. The installation types are: Vibrating wire piezometer: a vibrating wire element connected to a sensitive diaphragm Standpipe: a plastic pipe with a slotted section A total of 134 vibrating wire piezometers and 32 standpipes will be installed Measurements of the groundwater are taken using either a datalogger (an electronic device that records the water level at a set time) or by manual measurements (by dropping a measuring tape down the standpipe) Measurements have been taken since late 2014 Over 1 million readings have been collected since 2012

3 Hydrogeology Image thanks to PDP A model has been developed to understand the geology and hydrology for the catchment where the CRL will be constructed. Shallow and deep groundwater flow systems have been confirmed by drilling and groundwater investigations. The known characteristics of the soil or rock units influence the storage or movement of groundwater. Hydrogeology Key areas of interest within the project area are Britomart, Karangahape Road and the North Auckland Line at Mt Eden The hydrology of the city centre catchment has been significantly modified during the development of the city with increased building and paved surfaces Construction methodologies will control inflows of groundwater into the CRL construction areas, such as tunnel excavations The design of CRL structures will include drainage systems to control groundwater inflows Groundwater flows at the Wai Horotiu Spring (Myers Park) will be monitored during investigations and construction

4 Sustainability The project team is considering the whole-of-life cycle of the project when making design choices to consider the effect they have on sustainability during the construction and operation of the CRL. Understanding the energy use at existing stations helps us prioritise efforts around energy efficiency in the design of new stations. The CRL has adopted the Infrastructure Sustainability Council of Australia s rating scheme to provide a framework to set targets and measure against across all aspects of the project. Design Themes Categories Operation Construction Management and Governance Using Resources Emissions, Pollution and Waste Ecology People and Place Innovation Management Systems Procurement and Purchasing Climate Change Adaptation Energy and Carbon Water Materials Discharges to Air, Land and Water Land Use Waste Ecological value and biodiversity Community Health, Well-being and Safety Heritage Stakeholder Participation Urban and Landscape Design Strategies and technologies

5 Project Milestones Nov 2011-July 2012 Past Concept design finalised to enable project footprint to be determined as the basis of landowner engagement August - Sept 2012 Meeting with owners of surface and subterranean properties affected by CRL Meetings with owners of properties proximate to the footprint Jan - Dec 2013 Notices of Requirement lodged based on concept design Open days, public submissions Hearing Dec 2013 Principal Technical Advisor appointed and challange team reviews AT s continuing design optimisation April 2014 Current NoRs confirmed with conditions to manage effects. Six appeals June 2014 Resource consent application for pump test of water levels at Karangahape Road Station site July 2014 Initiate detailed design process on Britomart/Albert St section of CRL to enable immediate start once funding becomes available Aug - Dec 2014 Open days Regional consent process July July 2014 Concept design optimised and opportunities identified. Changes include; replacing Newton Station with connection at Mt Eden Softer curves to reduce journey times and allow level platforms at all station and wider platforms at Aotea Station Future Regional consent approvals Appeals hearing Enabling works Detailed design

6 Connecting at Mt Eden Mt Eden station will now be connected to the CRL, replacing the proposed Newton Station. Britomart to Mt Eden will then be a nine minute journey instead of 16. That s a 44% travel time saving. Previously Mt Eden sat between the CRL s east and west facing connections to the existing western line. Now passengers at Mt Eden will have the option of going direct to the city with the first stop at Karangahape Road, as well as the current Grafton/Kingsland journeys. The change brings considerable other benefits. Customer experience Improves reliability across the rail network with a grade separated junction Saves time for 3000 passengers a day - 95 a day have longer journeys Deep lifts at Newton replaced by open to air platforms Provides better modal transfer Development Leverages development of construction site Better fit with wider development potential Construction impacts Reduces construction disruption on Symonds St by months Reduces construction effects on some properties Six fewer surface properties required Cost About a dozen fewer sub-surface properties required Reduces capital cost by $154 million Reduces operational expenditure

7 Enabling Auckland s Development Construction of the will have a big impact on the rest of the city, and the downtown area is the most affected by surface construction. Auckland Transport is prioritising design, consenting and procurement in the Downtown area, from Britomart to Wyndham St, so that construction is able to start as soon as funding becomes available. A number of developments in the city centre will be affected by the : Downtown Shopping Centre development New Zealand International Convention Centre NDG Auckland Centre - Elliott St Quay Street upgrade Downtown Bus Interchange Fanshawe/Customs St bus prioritisation Auckland Transport has issued Requests for Proposal for the final phase of design development for the Downtown end of the (CRL): Finalising the design will allow AT to seek the consents necessary for the enabling works and allow an immediate construction start when AT is given the green light The CRL has not yet received a mandate from Auckland Council to construct and the design will be taken forward only when this has occurred In addition there are a number of events planned: Cricket World Cup (2015) World Masters Games (2017)

8 Economic and Development Benefits Cities drive economic growth and in modern times they thrive through the growth of the knowledge economy. Cities form and people choose to work in them because they are more productive; through scale and proximity. The availability of a skilled and educated workforce attracts high value-add businesses. Transport infrastructure is critical to shape urban form and lead economic development, as shown by the way that the Britomart transport hub sparked the transformation of the area from seedy to sought after. Britomart now has the highest rents and lowest vacancy rates of any part of our city. Significant economic gains can be made from transport investment that improves access for people into areas of high employment density. Auckland s employment composition About 60% of New Zealand s growth is in Auckland Auckland is New Zealand s commercial capital; home to over 60% of the top 200 companies. Auckland accounts for 34% of jobs in NZ and most are in the urban areas while Wellington, Hamilton and Tauranga combined, account for 13% of jobs. The city centre is the hub of Auckland s economy with up to 16,000 employees per square km. City centre workers on average earn 27% more than the rest of Auckland 23% 18% 23% 24% 12% Advanced business services, finance and insurance Goverment, health and education Wholesaling and retailing Other Manufacturing

9 Resource Consents and Approvals A range of regional resource consents and other regulatory approvals are being sought to reflect the future phasing of CRL construction. The following resource consents and statutory approvals are required: Regional resource consents under section 9, 14 and 15 of the Resource Management Act 1991 (RMA), including draft management plan frameworks for: Land disturbance/ bulk earthworks Groundwater takes and diversions Air discharges Stormwater discharges Discharges from contaminated land Land use resource consents under the Resource Management (National Environmental Standard for Assessing and Managing Contaminants in Soil to Protect Human Health) Regulations 2011 Archaeological Authority to undertake an activity that will or may modify or destroy the whole or any part of any archaeological site under section 44 of the Heritage New Zealand Pouhere Taonga Act 2014

10 Regional Consent Strategy CRL ENABLING WORKS BRITOMART TO WYNDHAM ST (NOVEMBER 2014) QUE EN S T BRITOMART SWA WYN NSO DHA N ST M ST ALBERT STREET STORMWATER MAIN DIVERSION (OCTOBER 2014) WEL LES LEY ST COMPREHENSIVE REGIONAL RESOURCE CONSENT APPLICATION - CITY RAIL LINK WORKS (AOTEA TO NAL) (APRIL 2015) STAGING OF CONSENTS ALBERT STREET STORMWATER MAIN DIVERSION (OCTOBER 2014) ENABLING WORKS BRITOMART TO WYNDHAM (NOVEMBER 2014) COMPREHENSIVE REGIONAL RESOURCE CONSENT APPLICATION - CITY RAIL LINK WORKS (AOTEA TO NAL) (APRIL 2015) UTILITIES DIVERSIONS NAL (APRIL 2015) ALIGNMENT UTILITIES DIVERSIONS NAL (APRIL 2015) NAL / EDEN TERRACE Main stages of consenting and approvals Lodgement in October 2014 Albert Street Stormwater Main Diversion Relocation of a stormwater pipe elsewhere in Albert St is required prior to the cut and cover construction of the tunnels Britomart to Wyndham Street Underpinning the Central Post Office building and the tunnels under Lower Queen Street, along Albert Street as far as Wyndham Street Archaeological Authority CRL Comprehensive Application All of the other CRL works between Aotea Station to the North Auckland Line including diversion of utilities Lodgement in March 2015 Job 2595_CRL Councillors Briefing A1 Posters _31/3/14 To establish protocols for discovery of artefacts within construction work sites