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D:\Stationary\EESSI 2011\Mardi MARDI – MANGROVE LINK PROJECT Prepared by Scott Allison (Crux Surveying Pty Ltd) Mob: 0404850381 Email: [email protected] NSW Excellence in Surveying & Spatial Information Awards 2011 Excellence, transparency and a commitment to go beyond the call of duty are the strong foundations on which Crux Surveying was built. Crux Surveying’s Statement of Excellence represents the heart and mind of what makes Crux Surveying a special place to work. Going far beyond the call of duty. Doing more than others expect. This is what excellence is all about. It comes from striving, maintaining the highest standards, looking after the smallest detail and going that extra mile. “Crux Surveying went beyond their scope of works to provide John Holland with a complete re-design of the Mardi – Mangrove Link Pipeline. Crux Surveying provided a very efficient and professional service to John Holland and as a result John Holland were able to construct the pipeline with the ability to solve unforeseen site issues and make changes within a very short period of time. They provided a seamless integration of the design through to set-out and construction.” – David O’Connor (Construction Manager) 2 CONTENTS OVERVIEW Pg 4 PROJECT BACKGROUND Pg 6 Route Selection Process Pg 6 Protecting the Yarramalong Valley Environment Pg 6 Landholder Liaison Pg 7 Easements for the Pipeline route Pg 7 Crossing Wyong river Pg 8 PROJECT PROCESS AND EXCELLENCE Pg 9 APPENDIX Pg 12 Sample Weld Restrain Sketch Pg 12 Sample Design Plans Pg 13 Site Photo’s Pg 17 John Holland Correspondence Pg 22 3 OVERVIEW The Mardi-Mangrove Link Project is a key element of WaterPlan 2050 which is the long term water supply strategy for the Central Coast. It will help to secure the region’s town water supply over the next four decades by linking Wyong River and Ourimbah Creek to Mangrove Creek Dam, via Mardi Dam. The project is an initiative of Gosford City and Wyong Shire Councils with Australian Government funding of $80.3 million from the Water Smart Australia Program and an additional $40 million combined from the two Councils. The Mardi-Mangrove Link pipeline is the largest water infrastructure project undertaken on the Central Coast since the mid-1980s when Mangrove Creek Dam was built. The project was awarded to John Holland Pty Ltd in 2009. John Holland initially engaged Crux Surveying’s in February 2010 to provide setout and work as executed plans for the DN1000 pipeline, valve pits, structures, pump station, electrical reticulation and fish weir. The Mardi – Mangrove Link had an original design which needed to be redesigned due to unforeseen circumstances. The redesign was to also take into account the approved construction corridor, which at times was only 10m wide, the steep terrain and availability of pipe and bends. Because of the strict timeframe a redesign was to be carried out in conjunction with the construction of the pipeline. John Holland approached Crux Surveying based on its experience in designing roads and drainage. Designing a 21km DN1000 pipeline, consisting of pipe bridges, valve pits and a 300m Horizontal Directional Drilling creek crossing was a major challenge, but Crux Surveying rose to the challenge. With the knowledge of, and liaison with, John Holland’s engineers, Crux succeeded in providing the construction crews with 35 pages of design. Each page consisted of approximately 600m of pipe long section and plan. Crux Surveying was also involved in some minor structure and pipe redesign for the two pump stations and existing pipe tie-ins. Locality Sketch [Gosford/Wyong Council’s Water Authority] 4 The complete Mardi – Mangrove Link project involved building: • a 2.1 kilometre buried water pipeline from Wyong River to Mardi Dam through Mardi • a 19 kilometre buried pipeline from Mardi Dam to the existing Bunning Creek Tunnel at Mangrove Creek Dam, running through Yarramalong Valley • a new pump station at Mardi Dam • a new pump station beside Wyong River • and associated works. The Central Coast community will benefit from the Mardi-Mangrove Link as it will help to boost dam storage levels, speed up drought recovery and help protect the region against future extended periods of below average rainfall. Overall Route Layout (GHD Pty Ltd – Original Plan) 5 PROJECT BACKGROUND A range of pre-construction activities had been achieved for the project. These included environmental and engineering studies and investigations, selection of the pipeline route, community and landholder liaison, statutory approvals, concept and detailed designs. Route selection process Selecting the pipeline route through Mardi and Yarramalong Valley was a major element of the Mardi-Mangrove Link pre-construction work. Where possible, the route selection process considered the following factors • local topography to avoid extreme changes in elevation • protected ecological and heritage features • potentially difficult pipe laying conditions (eg rock, thick vegetation, etc) • construction needs (eg sufficient space for equipment operation, pipe storage, backfill materials, etc) • potential road closures and impact on local traffic flows • access to the pipeline for future operation and maintenance work An expert panel then used a multi-criteria analysis to assess five key criteria including: • Landowner impacts • Community impacts (including impacts on Yarramalong Road) • Environmental impacts (including heritage / cultural impacts) • Constructability • Comparative cost estimates The proposed route was then subject to stringent reviews from an engineering, construction, design, environmental, geological and cost perspective. The pipeline route crosses a mixture of public and private land, with about 20% within the road reserve. This route selection was carried out prior to Crux Surveying’s redesign. However, some of the route was altered during the redesign stage to further minimise the abovementioned impacts. Protecting the Yarramalong Valley environment Extensive environmental planning and investigations were undertaken for the Mardi-Mangrove Link Project to ensure activities did not have a significant impact on the Yarramalong Valley environment. The pipeline route was selected to avoid sensitive ecological areas and to avoid significant impact on threatened species and endangered ecological communities. Senior ecologists were also involved in the entire route marking process. A number of safeguards and mitigation measures were also be implemented during construction of the pipeline and associated works. These include: 6 • retention of large trees either side of the pipeline easements as close to the pipeline as possible to maintain a local resource of hollow-bearing trees used by local fauna • delineation of sensitive ecolological areas using temporary fencing or tape • on-site attendance of a fauna ecologist during vegetation clearing. Detailed Project investigations also identified that the pipeline route corridor would not have a significant impact on local aquatic ecology or block fish passages. When areas in the Valley had to be disturbed during the construction process, revegetation was undertaken as quickly as possible to minimise the overall impacts. This became a major issue for John Holland due to the changing climate conditions. This commitment was challenging for the contractor due to significant rainfall during the construction period. An Indigenous heritage study was also undertaken to check if any important cultural items existed in pipeline route and an approach developed to ensure management in accordance with relevant State Government requirements and the local indigenous communities. Landholder liaison Extensive landholder liaison was undertaken by John Holland and the Project Team, particularly with those directly affected by construction. Stakeholder input was a key part of the route selection process, community meetings, open house events, one-on-one discussions, telephone and email discussions, and written correspondence all forming part of the liaison process. The project team provided affected landholders with comprehensive Landholder and Easement Packs which included a range of fact sheets and other information about the Project. The packs helped to explain land entry protocols, the easement acquisition process, insurance and liabilities, compensation payments, construction issues and other related matters. Because of the changes that had to be made to the pipeline route, the project team, including crux surveying, continued to liaise with affected landholders as the project progressed. There were times during the project where decisions on pipeline route and redesign were being made as the pipe was being laid. Gosford City and Wyong Shire Councils have a statutory right under the Water Management Act to access properties affected by the Project, however, their preference was to gain landholders' consent before accessing their land. Easements for the pipeline route A pipeline easement will be registered on each affected land title for Wyong Shire Council to construct, operate and maintain a buried water pipeline on that piece of land (except for where some above ground facilities might be required, such as valves and pipe-bridges). Affected landholders received compensation for the pipeline easement in accordance with the NSW Land Acquisition (Just Terms Compensation) Act 1991. 7 Easements will be subject to a number of usage restrictions once the pipeline is built and the land restored back to its original condition. These include landholders being
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