b'SMARTER, SHARPERCASE STUDY NO. 7 Construction of StormwaterInfrastructure, Green Square This project involved major sheet piling and watering, digging a 20m-deep Successful delivery of thisexcavation for two stormwater tanks and pipe installation. Scope included complex project was achievedmanagement of contaminated land, piling, sinking, constructionof two 8x20m by careful review of designs incaissons, and working around live services. advance of construction to raise and amend any discrepancies orEffective groundwater management through careful risk issues. Brefni mitigated delaysassessment through meticulous site planningBrefni completed water testing prior to the works to establish a water and supervision.management plan. Sedimentation tanks were utilised on site for the water to be pumped into, tested, treated and disposed of. Proactive water testing allowed Client: Seymour Whyte/UGLBrefni to plan for appropriate site conditions, minimising delays on site. Through risk workshops with designers, subcontractors and the client, we JV Value: $7 millionplanned and arranged for an innovative piling solution. This involved jacking precast concrete segments into the ground and excavating internal material Duration: 11 monthsas they went down. This reduced the inflow of groundwater, prevented over- excavation and mitigated ground settlement. Relevant features Processestoprotectexistingservicesduringworks CONFINEDSPACESBrefni liaised with third-party utility contractors to locate, expose and protect the services during the works. Where required, temporary works designs were completed to support all services during excavation works. This ensured all DEEP WET AND DRYworks could be completed without delays and minimised onsite the risk. EXCAVATIONSEnsuring safe working in confined spaces Due to the deep excavation and work within a 20m deep shaft, all construction WORKING AROUND EXISTINGmethods and access/egress required appropriate confined spaces protocols. SERVICESBrefni developed a project-specific rescue plan and utilised specialist plant for access and egress. BREFNI|17'