Goulburn Valley Water provides water and wastewater services to over 134,000 customers in 54 towns, who are connected to 37 water supply systems and 26 wastewater management facilities. The region covers approximately 20,000km2, from the outskirts of Melbourne northwards to the Murray River.
Industrial Environmental Services won the public tender to undertake a major remediation program of works at six sites in regional north-east Victoria, occupied by Goulburn Valley Water – including water treatment plants and waste management facilities. The sites required rehabilitation of stockpiles of hard waste, which included concrete, metal, soil and asbestos containing materials (ACM). Onsite constraints included existing/redundant site infrastructure and trees that needed to be maintained.
The program of works was focussed on the segregation of various wastes at the Goulbourn Valley Water sites in to their respective waste streams, so that the material can be disposed in the most appropriate manner.
• Removal and reinstatement of fencing access to impacted areas
• Excavate impacted fill soils, abate ACM and sieve Solid Industrial Waste (SIW)
• Test pitting to determine full extent of impacts
• Systematic surface removal of exposed industrial waste
• Segregate SIW into different waste streams
• Dispose of SIW and ACM to appropriate licensed facilities
• Reuse processed soil onsite, or transport offsite to licensed facility
• Obtain clearance certificate for processed soil and ground surface of rehabilitation areas
• Removal of ACM pipe work/debris.
The overall program incorporated UPSS decommissioning and onsite remedial works, with the first stage of delivery including demolition and remedial activities at six redundant retail centres. Our scope primarily involved the decommissioning and exhumation of existing UPSS and fuel related infrastructure from each site.
Our approach for this program of works, as with most, was designed to minimise remediation requirements, maximising site time through technical innovations, team work, pre-planning, and local council and stakeholder engagement.
In addition, during the course of exploratory excavations, our teams discovered three additional underground storage tanks onsite, which were identified as containing cement stabilised sand and previously decommissioned in earlier works. The complications associated with the discovered orphaned tanks included potential explosive environments, without the ability to apply conventional de-gassing methods to enable onsite destruction to accommodate for weight/handling and cost efficiencies. This was addressed by implementing our cold cutting hydraulic shear technique. The approved (minimal ignition risk methodology) involved safely processing by cold cutting the insitu UPSS with the excavator fitted with a specialised shearing attachment. Although this unforseen scope had the real potential to impact both the works program timing and budget, the flexibility of IES in cooperation with the environmental consultant allowed the site personal to deliver the project in a safe, timely manner maintaining the project’s prime objectives.
IES has a thorough understanding of the petroleum industry and project needs, including the need to optimise return on land following decommissioning and remediation. We also have an excellent understanding of physical environment, optimising on local industry contacts and resources for engineered fill and other resources based on our previous experience. This has enabled us to develop an approach that maximises commercial returns and minimises cost uncertainties and risks.
Our comprehensive project understanding, front-end and ongoing strategic planning, coupled with clearly-defined and well understood project priorities, tasks and responsibilities, have been key to our success in delivering major and complex projects for our clients. We have contributed in the delivery of a large number of Australian site closures for our petroleum clients over the past few years on or ahead of schedule and within budgets. This project presented the unique challenges of multiple sites separated across a large geographic area that required expedited successful completion within 62 working days at a fixed cost delivering.